ORCID Profile
0000-0002-4296-4153
Current Organisations
Queensland University of Technology (QUT)
,
Queensland University of Technology
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Chemical Characterisation of Materials | Microbial Ecology | Functional Materials | Environmental Science and Management | Synthesis of Materials | Environmental Management | Microbiology | Materials Engineering | Bioremediation | Geochemistry not elsewhere classified
Rehabilitation of Degraded Mining Environments | Urban and Industrial Soils | Management of Solid Waste from Mineral Resource Activities | Expanding Knowledge in the Chemical Sciences | Mining Land and Water Management |
Publisher: Elsevier BV
Date: 09-2011
DOI: 10.1016/J.SAA.2011.04.035
Abstract: Newberyite Mg(PO3OH)·3H2O is a mineral found in caves such as from Moorba Cave, Jurien Bay, Western Australia, the Skipton Lava Tubes (SW of Ballarat, Victoria, Australia) and in the Petrogale Cave (Madura, Eucla, Western Australia). Because these minerals contain oxyanions, hydroxyl units and water, the minerals lend themselves to spectroscopic analysis. Raman spectroscopy can investigate the complex paragenetic relationships existing between a number of 'cave' minerals. The intense sharp band at 982 cm(-1) is assigned to the PO4(3-)ν1 symmetric stretching mode. Low intensity Raman bands at 1152, 1263 and 1277 cm(-1) are assigned to the PO4(3-)ν3 antisymmetric stretching vibrations. Raman bands at 497 and 552 cm(-1) are attributed to the PO4(3-)ν4 bending modes. An intense Raman band for newberyite at 398 cm(-1) with a shoulder band at 413 cm(-1) is assigned to the PO4(3-)ν2 bending modes. The values for the OH stretching vibrations provide hydrogen bond distances of 2.728 Å (3267 cm(-1)), 2.781 Å (3374 cm(-1)), 2.868 Å (3479 cm(-1)), and 2.918 Å (3515 cm(-1)). Such hydrogen bond distances are typical of secondary minerals. Estimates of the hydrogen-bond distances have been made from the position of the OH stretching vibrations and show a wide range in both strong and weak bonds.
Publisher: American Chemical Society (ACS)
Date: 27-09-2018
Publisher: Wiley
Date: 04-12-2007
DOI: 10.1002/JRS.1838
Publisher: Elsevier BV
Date: 2009
DOI: 10.1016/J.JCIS.2008.09.065
Abstract: Hydrotalcites with cationic ratios of 2:1, 3:1, and 4:1 were synthesised using the co-precipitation method. The mechanism of inclusion of arsenate, vanadate, and molybdate into these structures is investigated using the combination of X-ray diffraction, Raman spectroscopy, and thermal analysis. Results show that hydrotalcites with cationic ratios of 3:1 are thermally more stable then the 2:1 and 4:1 structures. The increase in thermal stability of the 3:1 hydrotalcite structures is understood to be due to the intercalation of arsenate, vanadate, or molybdate, by an increase in hydrogen bonds associated with the intercalated anion. The 3:1 vanadate hydrotalcite is the most thermally stable hydrotalcite investigated. It is observed that the predominant mechanism for inclusion of the three anionic species is adsorption for 2:1 and 4:1 hydrotalcites, and intercalation for the 3:1 hydrotalcite structures. The intercalation of arsenate, vanadate, and molybdate into the hydrotalcite structure increased the interlayer distance of the hydrotalcite by 0.14, 0.13, and 0.26 A, respectively.
Publisher: Elsevier BV
Date: 05-2011
Publisher: Elsevier BV
Date: 04-2011
DOI: 10.1016/J.SAA.2010.12.039
Abstract: The mineral delvauxite CaFe(4)(3+)(PO(4),SO(4))(2)(OH)(8)·4-6H(2)O has been characterised by Raman spectroscopy and infrared spectroscopy. The mineral is associated with the minerals diadochite and destinezite. Delvauxite appears to vary in crystallinity from amorphous to semi-crystalline. The mineral is often X-ray non-diffracting. The minerals are found in soils and may be described as 'colloidal' minerals. Vibrational spectroscopy enables determination of the molecular structure of delvauxite. Bands are assigned to phosphate and sulphate stretching and bending modes. Two symmetric stretching modes for both the phosphate and sulphate symmetric stretching modes support the concept of non-equivalent phosphate and sulphate units in the mineral structure. Multiple water bending and stretching modes imply that non-equivalent water molecules in the structure exist with different hydrogen bond strengths.
Publisher: Elsevier BV
Date: 06-2009
DOI: 10.1016/J.SAA.2008.12.018
Abstract: Near-infrared (NIR), X-ray diffraction (XRD) and infrared (IR) spectroscopy have been applied to hydrotalcites of the formula Mg(6) (Fe,Al)(2)(OH)(16)(CO(3)).4H(2)O formed by intercalation with the carbonate anion as a function of alent/trivalent cationic ratio. Such hydrotalcites were found to show variation in the d-spacing attributed to the size of the cation. In the IR (1750-4000cm(-1)), the position of all bands except those at approximately 3060cm(-1) shift to higher wavenumbers as the cation ratio increases. Conversely, at wavenumbers below 1000cm(-1), the bands shift to lower wavenumbers as the cation ratio increases. A water bending mode at higher wavenumbers was also observed which indicates that the water is strongly hydrogen bonded. In the NIR spectrum between 8000 and 12,000cm(-1), there is a broad feature which is attributed to electronic bands of the ferrous ion and low intensity sharp bands due to overtones of the OH stretching vibrations. It is also apparent from this region that Fe(2+) substitutes for Mg(2+). The intensity of bands at 7750 and 5200cm(-1) increases as the cation ratio increases in the NIR spectrum. Hydrotalcites with a magnesium amount 3 and 4 times greater than that of aluminium and iron combined, in the lower wavenumber region of the NIR spectrum, have very similar spectral profiles. This work has shown that hydrotalcites with different alent/trivalent ratios can be synthesised and characterised by infrared spectroscopy.
Publisher: Springer Science and Business Media LLC
Date: 26-03-2011
Publisher: Wiley
Date: 23-02-2011
DOI: 10.1002/JRS.2883
Publisher: Elsevier BV
Date: 04-2012
DOI: 10.1016/J.SAA.2011.12.034
Abstract: The multianion mineral gartrellite PbCu(Fe3+,Cu)(AsO4)2(OH,H2O)2 has been studied by a combination of Raman and infrared spectroscopy. The vibrational spectra of two gartrellite s les from Durango and Ashburton Downs were compared. Gartrellite is one of the tsumcorite mineral group based upon arsenate and sulphate anions. Crystal symmetry is either triclinic in the case of an ordered occupation of two cationic sites, triclinic due to ordering of the H bonds in the case of species with 2 water molecules per formula unit, or monoclinic in the other cases. Characteristic Raman spectra of the minerals enable the assignment of the bands to specific vibrational modes. These spectra are related to the structure of gartrellite. The position of the hydroxyl and water stretching vibrations are related to the strength of the hydrogen bond formed between the OH unit and the AsO4 anion.
Publisher: Wiley
Date: 27-10-2011
DOI: 10.1002/JRS.3063
Publisher: Elsevier BV
Date: 10-2011
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 05-2007
Publisher: SAGE Publications
Date: 07-2009
DOI: 10.1366/000370209788701152
Abstract: The seawater neutralization process is currently used in the alumina industry to reduce the pH and dissolved metal concentrations in bauxite refinery residues through the precipitation of Mg, Al, and Ca hydroxide and carbonate minerals. This neutralization method is very similar to the co-precipitation method used to synthesize hydrotalcite (Mg 6 Al 2 (OH) 16 CO 3 -4H 2 O). This study looks at the effect of temperature on the type of precipitates that form from the seawater neutralization process of Bayer liquor. The Bayer precipitates have been characterized by a variety of techniques, including X-ray diffraction (XRD), Raman spectroscopy, and infrared spectroscopy. The mineralogical composition of Bayer precipitates largely includes hydrotalcite, hydromagnesite, and calcium carbonate species. Analysis with XRD determined that Bayer hydrotalcites that are synthesized at 55 °C have a larger interlayer distance, indicating that more anions are removed from Bayer liquor. Vibrational spectroscopic techniques have identified an increase in hydrogen bond strength for precipitates formed at 55 °C, suggesting the formation of a more stable Bayer hydrotalcite. Raman spectroscopy identified the intercalation of sulfate and carbonate anions into Bayer hydrotalcites using these synthesis conditions.
Publisher: Springer Science and Business Media LLC
Date: 28-08-2009
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 05-2011
DOI: 10.1016/J.SAA.2011.02.019
Abstract: Near infrared (NIR), X-ray diffraction (XRD) and infrared (IR) spectroscopy have been applied to halotrichites of the formula MgAl(2)(SO(4))(4)·22H(2)O, MnAl(2)(SO(4))(4)·22H(2)O and ZnAl(2)(SO(4))(4)·22H(2)O. Comparison of the halotrichites in different spectral regions has shown that the incorporation of a alent transition metal into the halotrichite structure causes a shift in OH stretching band positions to lower wavenumbers. Therefore, an increase of the hydrogen bond strength of the bonded water is observed for alent cations with a larger molecular mass. XRD has confirmed the formation of halotrichite for all three s les and characteristic peaks of halotrichite have been identified for each halotrichite-type compound. It has been observed that Mg-Al and Mn-Al halotrichite are very similar in structure, while Zn-Al showed several differences particularly in the NIR spectra. This work has shown that compounds with halotrichite structures can be synthesised and characterised by infrared and NIR spectroscopy.
Publisher: Elsevier BV
Date: 05-2011
Publisher: Elsevier BV
Date: 04-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EW00266H
Abstract: A robust method involving intermediate nanofiltration in a dual stage RO system to achieve high water recovery rates from coal seam water has been developed.
Publisher: Springer Science and Business Media LLC
Date: 25-07-2009
Publisher: Wiley
Date: 07-2010
DOI: 10.1002/JRS.2512
Publisher: Springer Science and Business Media LLC
Date: 12-01-2009
Publisher: Wiley
Date: 24-09-2007
DOI: 10.1002/JRS.1820
Publisher: Wiley
Date: 12-2010
DOI: 10.1002/JRS.2632
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 06-2016
Publisher: American Chemical Society (ACS)
Date: 26-02-2014
DOI: 10.1021/IE403382Z
Publisher: Wiley
Date: 03-03-2009
DOI: 10.1002/JRS.2198
Publisher: Wiley
Date: 25-09-2009
DOI: 10.1002/JRS.2473
Publisher: Elsevier BV
Date: 04-2008
Publisher: Springer Science and Business Media LLC
Date: 23-04-2011
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.SAA.2011.07.088
Abstract: Many phosphate containing minerals are found in the Jenolan Caves. Such minerals are formed by the reaction of bat guano and clays from the caves. Among these cave minerals is the mineral taranakite (K,NH(4))Al(3)(PO(4))(3)(OH)·9(H(2)O) which has been identified by X-ray diffraction. Jenolan Caves taranakite has been characterised by Raman spectroscopy. Raman and infrared bands are assigned to H(2)PO(4), OH and NH stretching vibrations. By using a combination of XRD and Raman spectroscopy, the existence of taranakite in the caves has been proven.
Publisher: Elsevier BV
Date: 08-2007
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 06-2011
DOI: 10.1016/J.SAA.2011.02.028
Abstract: Raman spectroscopy has been used to characterise nine hydrotalcites prepared from aluminate and magnesium solutions (magnesium chloride and seawater). The aluminate hydrotalcites are proposed to have the following formula Mg(6)Al(2)(OH)(16)(CO(3)(2-))·xH(2)O, Mg(6)Al(2)(OH)(16)(CO(3)(2-),SO(4)(2-))·xH(2)O, and Mg(6)Al(2)(OH)(16)(SO(4)(2-))·xH(2)O. The synthesis of these hydrotalcites using seawater results in the intercalation of sulfate anions into the hydrotalcite interlayer. The spectra have been used to assess the molecular assembly of the cations and anions in the hydrotalcite structures. The spectra have been conveniently sub ided into spectral features based upon the carbonate anion, the hydroxyl units and water units. This investigation has shown the ideal conditions to form hydrotalcite from aluminate solutions is at pH 14 using a magnesium chloride solution at a volumetric ratio of 1:1. Changes in synthesis conditions resulted in the formation of impurity products aragonite, thenardite, and gypsum.
Publisher: Springer Science and Business Media LLC
Date: 05-2011
Publisher: Elsevier BV
Date: 2011
DOI: 10.1016/J.SAA.2010.10.002
Abstract: Raman spectroscopy has been used to study the molecular structure of the vanadate mineral pascoite. Pascoite, rauvite and huemulite are ex les of simple salts involving the decavanadate anion (V10O28)6-. Decavanadate consists of four distinct VO6 units which are reflected in Raman bands occurring at higher wavenumbers. The Raman spectrum of pascoite is characterised by two intense bands at 991 and 965 cm(-1). Raman bands are observed at 991, 965, 958 and 905 cm(-1) and originate from four distinct VO6 sites in the mineral structure. In the infrared spectra of pascoite, two wavenumber regions are observed between: (1) 837 and 860, and (2) between 803 and 833 cm(-1). These bands are assigned to ν3 antisymmetric stretching modes of (V10O28)6- or (V5O14)3- units. The spectrum is highly complex in the lower wavenumber region, and therefore the assignment of bands is difficult. Bands observed in the 404 to 458 cm(-1) region are assigned to the ν2 bending modes of (V10O28)6- or (V5O14)3- units. Raman bands observed in the 530-620 cm(-1) region are assigned to the ν4 bending modes of (V10O28)6- or (V5O14)3- units. The Raman spectra of the vanadates in the low wavenumber region are complex with multiple overlapping bands which are probably due to VO subunits and MO bonds.
Publisher: Elsevier BV
Date: 02-2010
DOI: 10.1016/J.JCIS.2009.10.010
Abstract: The effectiveness of using thermally activated hydrotalcite materials has been investigated for the removal of arsenate, vanadate, and molybdate in in idual and mixed solutions. Results show that increasing the Mg,Al ratio to 4:1 causes an increase in the percentage of anions removed from solution. The order of affinity of the three anions analysed in this investigation is arsenate, vanadate, and molybdate. By comparisons with several synthetic hydrotalcite materials, the hydrotalcite structure in the seawater neutralised red mud (SWN-RM) has been determined to consist of magnesium and aluminium with a ratio between 3.5:1 and 4:1. Thermally activated seawater neutralised red mud removes at least twice the concentration of anionic species than thermally activated red mud alone, due to the formation of 40-60% Bayer hydrotalcite during the neutralisation process.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 12-2014
Publisher: Elsevier BV
Date: 10-2018
Publisher: Wiley
Date: 08-11-2010
DOI: 10.1002/JRS.2827
Publisher: Wiley
Date: 04-11-2010
DOI: 10.1002/JRS.2822
Publisher: Elsevier BV
Date: 09-2007
Publisher: Elsevier BV
Date: 03-2011
DOI: 10.1016/J.SAA.2010.12.014
Abstract: The NIR spectra of reichenbachite, scholzite and parascholzite have been studied at 298 K. The spectra of the minerals are different, in line with composition and crystal structural variations. Cation substitution effects are significant in their electronic spectra and three distinctly different electronic transition bands are observed in the near-infrared spectra at high wavenumbers in the 12,000-7600 cm(-1) spectral region. Reichenbachite electronic spectrum is characterised by Cu(II) transition bands at 9755 and 7520 cm(-1). A broad spectral feature observed for ferrous ion in the 12,000-9000 cm(-1) region both in scholzite and parascholzite. Some what similarities in the vibrational spectra of the three phosphate minerals are observed particularly in the OH stretching region. The observation of strong band at 5090 cm(-1) indicates strong hydrogen bonding in the structure of the dimorphs, scholzite and parascholzite. The three phosphates exhibit overlapping bands in the 4800-4000 cm(-1) region resulting from the combinations of vibrational modes of (PO(4))(3-) units.
Publisher: Elsevier BV
Date: 12-2016
Publisher: Wiley
Date: 10-11-2009
DOI: 10.1002/JRS.2148
Publisher: Elsevier BV
Date: 2011
DOI: 10.1016/J.JCIS.2010.09.062
Abstract: The increase in pH and aluminium concentration after the neutralisation of bauxite refinery residues is commonly known as reversion. This investigation reports the extent of reversion in synthetic supernatant liquor and possible methods to reduce reversion. This work is based on bauxite refinery residues produced from alumina refineries, where reversion is a real life situation in neutralised refinery residues. Tricalcium aluminate hexahydrate, a common phase in bauxite refinery residues, has been found to cause reversion. It has been established that reductions in both pH and aluminium from the seawater neutralisation process are due to the formation of 'Bayer' hydrotalcite Mg(7)Al(2)(OH)(18)(CO(3)(2-),SO(4)(2-))·xH(2)O. This is the primary mechanism involved in the removal of aluminium from solution. Increasing the volume of seawater used for the neutralisation process minimises the extent of reversion for both synthetic supernatant liquor and red mud slurry. The addition of MgCl(2)·6H(2)O also showed a reduction in reversion and confirmed that the decrease in aluminium and hydroxyl ions is due to the formation of Bayer hydrotalcite and not simply a dilution effect.
Publisher: Informa UK Limited
Date: 02-2012
Publisher: Elsevier BV
Date: 08-2012
DOI: 10.1016/J.SAA.2012.03.017
Abstract: In this paper, we report on many phosphate containing natural minerals found in the Jenolan Caves - Australia. Such minerals are formed by the reaction of bat guano and clays from the caves. Among these cave minerals is the montgomeryite mineral [Ca(4)MgAl(4)(PO(4))(6)·(OH)(4)·12H(2)O]. The presence of montgomeryite in deposits of the Jenolan Caves - Australia has been identified by X-ray diffraction (XRD). Raman spectroscopy complimented with infrared spectroscopy has been used to characterise the crystal structure of montgomeryite. The Raman spectrum of a standard montgomeryite mineral is identical to that of the Jenolan Caves s le. Bands are assigned to H(2)PO(4)(-), OH and NH stretching vibrations. By using a combination of XRD and Raman spectroscopy, the existence of montgomeryite in the Jenolan Caves - Australia has been proven. A mechanism for the formation of montgomeryite is proposed.
Publisher: Wiley
Date: 26-09-2010
DOI: 10.1002/JRS.2782
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.SAA.2011.07.078
Abstract: The mineral crandallite CaAl(3)(PO(4))(2)(OH)(5)·(H(2)O) has been identified in deposits found in the Jenolan Caves, New South Wales, Australia by using a combination of X-ray diffraction and Raman spectroscopic techniques. A comparison is made between the vibrational spectra of crandallite found in the Jenolan Caves and a standard crandallite. Raman and infrared bands are assigned to PO(4)(3-) and HPO(4)(2-) stretching and bending modes. The predominant features are the internal vibrations of the PO(4)(3-) and HPO(4)(2-) groups. A mechanism for the formation of crandallite is presented and the conditions for the formation are elucidated.
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.SAA.2011.09.040
Abstract: In order to mimic the chemical reactions in cave systems, the analogue of the mineral stercorite H(NH(4))Na(PO(4))·4H(2)O has been synthesised. X-ray diffraction of the stercorite analogue matches the stercorite reference pattern. A comparison is made with the vibrational spectra of synthetic stercorite analogue and the natural Cave mineral. The mineral in nature is formed by the reaction of bat guano chemicals on calcite substrates. A single Raman band at 920 cm(-1) (Cave) and 922 cm(-1) (synthesised) defines the presence of hydrogen phosphate in the mineral. In the synthetic stercorite analogue, additional bands are observed and are attributed to the dihydrogen and phosphate anions. The vibrational spectra of synthetic stercorite only partly match that of the natural stercorite. It is suggested that natural stercorite is more pure than that of synthesised stercorite. Antisymmetric stretching bands are observed in the infrared spectrum at 1052, 1097, 1135 and 1173 cm(-1). Raman spectroscopy shows the stercorite mineral is based upon the hydrogen phosphate anion and not the phosphate anion. Raman and infrared bands are found and assigned to PO(4)(3-), H(2)O, OH and NH stretching vibrations. Raman spectroscopy shows the synthetic analogue is similar to the natural mineral. A mechanism for the formation of stercorite is provided.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Springer Science and Business Media LLC
Date: 05-2011
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 2024
Publisher: Elsevier BV
Date: 04-2011
DOI: 10.1016/J.SAA.2010.12.084
Abstract: Raman spectroscopy has enabled insights into the molecular structure of the richelsdorfite Ca(2)Cu(5)Sb[Cl|(OH)(6)|(AsO(4))(4)]·6H(2)O. This mineral is based upon the incorporation of arsenate or phosphate with chloride anion into the structure and as a consequence the spectra reflect the bands attributable to these anions, namely arsenate or phosphate and chloride. The richelsdorfite Raman spectrum reflects the spectrum of the arsenate anion and consists of ν(1) at 849, ν(2) at 344 cm(-1), ν(3) at 835 and ν(4) at 546 and 498 cm(-1). A band at 268 cm(-1) is attributed to CuO stretching vibration. Low wavenumber bands at 185 and 144 cm(-1) may be assigned to CuCl TO/LO optic vibrations.
Publisher: Wiley
Date: 04-11-2010
DOI: 10.1002/JRS.2817
Publisher: Elsevier BV
Date: 09-2011
DOI: 10.1016/J.SAA.2011.04.045
Abstract: Raman spectroscopy complimented with infrared spectroscopy has been used to characterise the mineral stercorite H(NH4)Na(PO4)·4H2O. The mineral stercorite originated from the Petrogale Cave, Madura, Eucla, Western Australia. This cave is one of many caves in the Nullarbor Plain in the South of Western Australia. These caves have been in existence for eons of time and have been dated at more than 550 million years old. The mineral is formed by the reaction of bat guano chemicals on calcite substrates. A single Raman band at 920 cm(-1) defines the presence of phosphate in the mineral. Antisymmetric stretching bands are observed in the infrared spectrum at 1052, 1097, 1135 and 1173 cm(-1). Raman spectroscopy shows the mineral is based upon the phosphate anion and not the hydrogen phosphate anion. Raman and infrared bands are found and assigned to PO4(3-), H2O, OH and NH stretching vibrations. The detection of stercorite by Raman spectroscopy shows that the mineral can be readily determined as such the application of a portable Raman spectrometer in a 'cave' situation enables the detection of minerals, some of which may remain to be identified.
Publisher: Elsevier BV
Date: 06-2022
Publisher: American Chemical Society (ACS)
Date: 16-01-2013
DOI: 10.1021/IE301618P
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 09-2011
DOI: 10.1016/J.SAA.2011.04.044
Abstract: The mineral sanjuanite Al2(PO4)(SO4)(OH)·9H2O has been characterised by Raman spectroscopy complimented by infrared spectroscopy. The mineral is characterised by an intense Raman band at 984 cm(-1), assigned to the (PO4)3- ν1 symmetric stretching mode. A shoulder band at 1037 cm(-1) is attributed to the (SO4)2- ν1 symmetric stretching mode. Two Raman bands observed at 1102 and 1148 cm(-1) are assigned to (PO4)3- and (SO4)2- ν3 antisymmetric stretching modes. Multiple bands provide evidence for the reduction in symmetry of both anions. This concept is supported by the multiple sulphate and phosphate bending modes. Raman spectroscopy shows that there are more than one non-equivalent water molecules in the sanjuanite structure. There is evidence that structural disorder exists, shown by the complex set of overlapping bands in the Raman and infrared spectra. At least two types of water are identified with different hydrogen bond strengths. The involvement of water in the sanjuanite structure is essential for the mineral stability.
Publisher: Wiley
Date: 2006
DOI: 10.1002/JRS.1601
Publisher: Springer Science and Business Media LLC
Date: 20-08-2010
Publisher: Elsevier BV
Date: 2009
DOI: 10.1016/J.SAA.2008.06.038
Abstract: The characterisation of red mud has been studied by diffuse reflectance spectroscopy in the UV-vis-NIR region (DRS). For the first time the ferric ion responsible for the bands has been identified from electronic spectroscopy. It contains valuable amounts of oxidised iron (Fe(3+)) and aluminium hydroxide. The NIR peak at around 11,630 cm(-1) (860 nm) with a split of two components and a pair of sharp bands near 500 nm (20000 cm(-1)) in the visible spectrum are attributed to Fe(3+) ion in distorted sixfold coordinations. The observation of identical spectral patterns (both electronic and vibrational spectra) of red mud before and after seawater neutralisation (SWN) confirmed that there is no effect of seawater neutralisation on structural cation substitutions such as Al(3+), Fe(3+), Fe(2+), Ti(3+), etc.
Publisher: Elsevier BV
Date: 03-2014
DOI: 10.1016/J.JCIS.2013.11.040
Abstract: The application of layered double hydroxides (LDHs) and thermally activated LDHs for the removal of various fluorine (F(-),BF4(-)), chlorine (Cl(-),ClO4(-)), bromine (Br(-),BrO3(-)) and iodine (I(-),IO3(-)) species from aqueous solutions has been reviewed in this article. LDHs and thermally activated LDHs were able to significantly reduce the concentration of selected anions in laboratory scale experiments. The M(2+):M(3+) cation ratio of the LDH adsorbent was an important factor which influenced anion uptake. Though LDHs were able to remove some target anion species through anion exchange and surface adsorption thermal activation and reformation generally produced better results. The presence of competing anions including carbonate, phosphate and sulphate had a significant impact on uptake of the target anion as LDHs typically exhibit lower affinity towards monovalent anions compared to anions with multiple charges. The removal of fluoride and perchlorate from aqueous solution by a continuous flow system utilising fixed bed columns packed with LDH adsorbents has also been investigated. The adsorption capacity of the columns at breakpoint was heavily dependent on the flow rate and lower than result reported for the corresponding batch methods. There is still considerable scope for future research on numerous topics summarised in this article.
Publisher: Elsevier BV
Date: 12-2008
Publisher: Elsevier BV
Date: 11-2015
Publisher: Wiley
Date: 06-10-2009
DOI: 10.1002/JRS.2498
Publisher: Springer Science and Business Media LLC
Date: 28-08-2009
Publisher: Springer International Publishing
Date: 2019
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 06-2012
DOI: 10.1016/J.SAA.2012.02.102
Abstract: The two minerals borickyite and delvauxite CaFe(4)(3+)(PO(4),SO(4))(2)(OH)(8)·4-6H(2)O have the same formula. Are the minerals identical or different? The minerals borickyite and delvauxite have been characterised by Raman spectroscopy. The minerals are related to the minerals diadochite and destinezite. Both minerals are amorphous. Delvauxite appears to vary in crystallinity from amorphous to semi-crystalline. The minerals are often X-ray non-diffracting. The minerals are found in soils and may be described as 'colloidal' minerals. Vibrational spectroscopy enables an assessment of the molecular structure of borickyite and delvauxite. Bands are assigned to phosphate and sulphate stretching and bending modes. Multiple water bending and stretching modes imply that non-equivalent water molecules in the structure exist with different hydrogen bond strengths. The two minerals show differing spectra and must be considered as different minerals.
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 06-2017
Publisher: Springer Science and Business Media LLC
Date: 26-09-2009
Publisher: Springer Science and Business Media LLC
Date: 19-09-2008
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 02-2008
DOI: 10.1016/J.JCIS.2007.10.033
Abstract: The mechanism for the decomposition of hydrotalcite remains unsolved. Controlled rate thermal analysis enables this decomposition pathway to be explored. Hydrotalcites containing carbonate, vanadate and molybdate were prepared by coprecipitation. The resulting materials were characterised by XRD, simultaneous TG-DTG-DTA and controlled rate thermal analysis (CRTA) to determine the stability and thermal decomposition pathway of the synthesised hydrotalcites. For the carbonate intercalated hydrotalcite dehydration takes place in three steps two of which are quasi-isothermal and one non-isothermal. Dehydroxylation and decarbonation occur separately over the 235-330 and 330-370 degrees C temperature range. A second non-isothermal decarbonation step is observed in the 371-541 degrees C range. In comparison the mixed carbonate-vanadate and carbonate-molybdate hydrotalcites show two dehydration steps and the dehydroxylation and decarbonation occur simultaneously. The observation of three dehydration steps is used to support the model of water molecules in three structurally distinct environments in the hydrotalcite interlayer. CRTA technology provides a mechanism for the decomposition of hydrotalcites.
Publisher: Elsevier BV
Date: 2012
DOI: 10.1016/J.SAA.2011.09.057
Abstract: Some minerals are colloidal and show no X-ray diffraction patterns. Vibrational spectroscopy offers one of the few methods for the determination of the structure of these minerals. Among this group of minerals is pitticite, simply described as (Fe, AsO(4), SO(4), H(2)O). In this work, the analogue of the mineral pitticite has been synthesised. The objective of this research is to determine the molecular structure of the mineral pitticite using vibrational spectroscopy. Raman and infrared bands are attributed to the AsO(4)(3-), SO(4)(2-) and water stretching and bending vibrations. The Raman spectrum of the pitticite analogue shows intense peaks at 845 and 837cm(-1) assigned to the AsO(4)(3-) stretching vibrations. Raman bands at 1096 and 1182cm(-1) are attributed to the SO(4)(2-) antisymmetric stretching bands. Raman spectroscopy offers a useful method for the analysis of such colloidal minerals.
Publisher: Springer Science and Business Media LLC
Date: 30-01-2015
Publisher: Elsevier BV
Date: 05-2016
Publisher: Springer Science and Business Media LLC
Date: 12-01-2009
Publisher: Wiley
Date: 12-2010
DOI: 10.1002/JRS.2571
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 02-2013
DOI: 10.1016/J.SAA.2012.07.057
Abstract: Plumbogummite PbAl(3)(PO(4))(2)(OH,H(2)O)(6) is a mineral of environmental significance and is a member of the alunite-jarosite supergroup. The molecular structure of the mineral has been investigated by Raman spectroscopy. The spectra of different plumbogummite specimens differ although there are many common features. The Raman spectra prove the spectral profile consisting of overlapping bands and shoulders. Raman bands and shoulders observed at 971, 980, 1002 and 1023 cm(-1) (China s le) and 913, 981, 996 and 1026 cm(-1) (Czech s le) are assigned to the ν(1) symmetric stretching modes of the (PO(4))(3-), at 1002 and 1023 cm(-1) (China) and 996 and 1026 cm(-1) to the ν(1) symmetric stretching vibrations of the (O(3)POH)(2-) units, and those at 1057, 1106 and 1182 (China) and at 1102, 1104 and 1179 cm(-1) (Czech) to the ν(3) (PO(4))(3-) and ν(3) (PO(3)) antisymmetric stretching vibrations. Raman bands and shoulders at 634, 613 and 579 cm(-1) (China) and 611 and 596 cm(-1) (Czech) are attributed to the ν(4) (δ) (PO(4))(3-) bending vibrations and those at 507, 494 and 464 cm(-1) (China) and 505 and 464 cm(-1) (Czech) to the ν(2) (δ) (PO(4))(3-) bending vibrations. The Raman spectrum of the OH stretching region is complex. Raman bands and shoulders are identified at 2824, 3121, 3249, 3372, 3479 and 3602 cm(-1) for plumbogummite from China, and at 3077, 3227, 3362, 3480, 3518 and 3601 cm(-1) for the Czech Republic s le. These bands are assigned to the ν OH stretching modes of water molecules and hydrogen ions. Approximate O-H⋯O hydrogen bond lengths inferred from the Raman spectra vary in the range >3.2-2.62Å (China) and >3.2-2.67Å (Czech). The minority presence of some carbonate ions in the plumbogummite (China s le) is connected with distinctive intensity increasing of the Raman band at 1106 cm(-1), in which may participate the ν(1) (CO(3))(2-) symmetric stretching vibration overlapped with phosphate stretching vibrations.
Publisher: American Chemical Society (ACS)
Date: 28-03-2011
DOI: 10.1021/IE1018194
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 21-09-2018
Publisher: Elsevier BV
Date: 11-2011
Publisher: Informa UK Limited
Date: 2013
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 09-2011
DOI: 10.1016/J.SAA.2011.04.069
Abstract: Raman and infrared spectra of two polymorphous minerals with the chemical formula Fe3+(SO4)(OH)·2H2O, monoclinic butlerite and orthorhombic parabutlerite, are studied and the spectra assigned. Observed bands are attributed to the (SO4)2- stretching and bending vibrations, hydrogen bonded water molecules, stretching and bending vibrations of hydroxyl ions, water librational modes, Fe-O and Fe-OH stretching vibrations, Fe-OH bending vibrations and lattice vibrations. The O-H⋯O hydrogen bond lengths in the structures of both minerals are calculated from the wavenumbers of the stretching vibrations. One symmetrically distinct (SO4)2- unit in the structure of butlerite and two symmetrically distinct (SO4)2- units in the structure of parabutlerite are inferred from the Raman and infrared spectra. This conclusion agrees with the published crystal structures of both mineral phases.
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.SAA.2011.07.039
Abstract: The objective of this research is to determine the molecular structure of the mineral leogangite. The formation of the types of arsenosulphate minerals offers a mechanism for arsenate removal from soils and mine dumps. Raman and infrared spectroscopy have been used to characterise the mineral. Observed bands are assigned to the stretching and bending vibrations of (SO(4))(2-) and (AsO(4))(3-) units, stretching and bending vibrations of hydrogen bonded (OH)(-) ions and Cu(2+)-(O,OH) units. The approximate range of O-H⋯O hydrogen bond lengths is inferred from the Raman spectra. Raman spectra of leogangite from different origins differ in that some spectra are more complex, where bands are sharp and the degenerate bands of (SO(4))(2-) and (AsO(4))(3-) are split and more intense. Lower wavenumbers of δ H(2)O bending vibration in the spectrum may indicate the presence of weaker hydrogen bonds compared with those in different leogangite s les. The formation of leogangite offers a mechanism for the removal of arsenic from the environment.
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 05-2013
DOI: 10.1016/J.SAA.2013.01.033
Abstract: Raman spectrum of callaghanite, Cu2Mg2(CO3)(OH)6·2H2O, was studied and compared with published Raman spectra of azurite, malachite and hydromagnesite. Stretching and bending vibrations of carbonate and hydroxyl units and water molecules were tentatively assigned. Approximate O-H…O hydrogen bond lengths were inferred from the spectra. Because of the high content of hydroxyl ions in the crystal structure in comparison with low content of carbonate units, callaghanite should be better classified as a carbonatohydroxide than a hydroxycarbonate.
Publisher: Wiley
Date: 19-04-2011
DOI: 10.1002/JRS.2959
Publisher: Elsevier BV
Date: 11-2020
Publisher: Informa UK Limited
Date: 10-2012
Publisher: Wiley
Date: 22-12-2009
DOI: 10.1002/JRS.2556
Publisher: Wiley
Date: 07-12-2010
DOI: 10.1002/JRS.2831
Publisher: Elsevier BV
Date: 07-2011
Publisher: Wiley
Date: 02-2011
DOI: 10.1002/JRS.2675
Publisher: Elsevier BV
Date: 10-2017
Publisher: Springer Science and Business Media LLC
Date: 06-2008
Publisher: Wiley
Date: 02-2011
DOI: 10.1002/JRS.2680
Publisher: Springer Science and Business Media LLC
Date: 19-06-2009
Publisher: Elsevier BV
Date: 04-2013
DOI: 10.1016/J.JCIS.2013.01.011
Abstract: This investigation has demonstrated the need for thermal treatment of seawater neutralised red mud (SWRM) in order to obtain reasonable adsorption of Reactive Blue dye 19 (RB 19). Thermal treatment results in a greater surface area, which results in an increased adsorption capacity due to more available adsorption sites. Adsorption of RB 19 has been found to be best achieved in acidic conditions using SWNRM400 (heated to 400°C) with an adsorption capacity of 416.7 mg/g compared to 250.0mg/g for untreated SWNRM. Kinetic studies indicate a pseudosecond-order reaction mechanism is responsible for the adsorption of RB 19 using SWNRM, which indicates adsorption occurs by electrostatic interactions.
Publisher: Elsevier BV
Date: 09-2011
DOI: 10.1016/J.SAA.2011.05.058
Abstract: The mineral tsumebite Pb2Cu(PO4)(SO4)(OH), a copper phosphate-sulfate hydroxide of the brackebuschite group has been characterised by Raman and infrared spectroscopy. The brackebuschite mineral group are a series of monoclinic arsenates, phosphates and vanadates of the general formula A2B(XO4)(OH,H2O), where A may be Ba, Ca, Pb, Sr, while B may be Al, Cu2+,Fe2+, Fe3+, Mn2+, Mn3+, Zn and XO4 may be AsO4, PO4, SO4,VO4. Bands are assigned to the stretching and bending modes of PO4(3-) and HOPO3 units. Hydrogen bond distances are calculated based upon the position of the OH stretching vibrations and range from 2.759 Å to 3.205 Å. This range of hydrogen bonding contributes to the stability of the mineral.
Publisher: Wiley
Date: 08-04-2009
DOI: 10.1002/JRS.2280
Publisher: Springer Science and Business Media LLC
Date: 28-11-2009
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 02-2012
DOI: 10.1016/J.SAA.2011.11.040
Abstract: The mineral schlossmacherite (H(3)O,Ca)Al(3)(AsO(4),PO(4),SO(4))(2)(OH)(6), a multi-cation-multi-anion mineral of the beudantite mineral subgroup has been characterised by Raman spectroscopy. The mineral and related minerals functions as a heavy metal collector and is often amorphous or poorly crystalline, such that XRD identification is difficult. The Raman spectra are dominated by an intense band at 864cm(-1), assigned to the symmetric stretching mode of the AsO(4)(3-) anion. Raman bands at 809 and 819cm(-1) are assigned to the antisymmetric stretching mode of AsO(4)(3-). The sulphate anion is characterised by bands at 1000cm(-1) (ν(1)), and at 1031, 1082 and 1139cm(-1) (ν(3)). Two sets of bands in the OH stretching region are observed: firstly between 2800 and 3000cm(-1) with bands observed at 2850, 2868, 2918cm(-1) and secondly between 3300 and 3600 with bands observed at 3363, 3382, 3410, 3449 and 3537cm(-1). These bands enabled the calculation of hydrogen bond distances and show a wide range of H-bond distances.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Wiley
Date: 04-2011
DOI: 10.1002/JRS.2906
Publisher: Elsevier BV
Date: 04-2018
Publisher: Informa UK Limited
Date: 09-2011
Publisher: Wiley
Date: 07-2010
DOI: 10.1002/JRS.2508
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 02-2015
Publisher: Wiley
Date: 29-05-2009
DOI: 10.1002/JRS.2349
Publisher: Wiley
Date: 12-2010
DOI: 10.1002/JRS.2625
Publisher: Wiley
Date: 23-02-2011
DOI: 10.1002/JRS.2900
Publisher: Elsevier BV
Date: 04-2011
DOI: 10.1016/J.SAA.2010.12.059
Abstract: The mineral nesquehonite Mg(OH)(HCO(3))·2H(2)O has been analysed by a combination of infrared (IR) and infrared emission spectroscopy (IES). Both techniques show OH vibrations, both stretching and deformation modes. IES proves the OH units are stable up to 450°C. The strong IR band at 934 cm(-1) is evidence for MgOH deformation modes supporting the concept of HCO(3)(-) units in the molecular structure. Infrared bands at 1027, 1052 and 1098 cm(-1) are attributed to the symmetric stretching modes of HCO(3)(-) and CO(3)(2-) units. Infrared bands at 1419, 1439, 1511, and 1528 cm(-1) are assigned to the antisymmetric stretching modes of CO(3)(2-) and HCO(3)(-) units. IES supported by thermoanalytical results defines the thermal stability of nesquehonite. IES defines the changes in the molecular structure of nesquehonite with temperature. The results of IR and IES supports the concept that the formula of nesquehonite is better defined as Mg(OH)(HCO(3))·2H(2)O.
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 08-2011
Publisher: CSIRO Publishing
Date: 2013
DOI: 10.1071/EN13048
Abstract: Environmental context Although land remediation programs for bauxite residues aim at vegetation coverage, the stability of compounds in the residues with acids produced by the vegetation has not been investigated. We show that, despite the instability of caustic components in the residues (negative effects on plant development), this instability actually assists in neutralising acidic soils. These results further affirm the suitability and sustainability of current land remediation programs for bauxite residues in terms of minimising acidic soil formation. Abstract This investigation used a combination of techniques, such as X-ray diffraction, inductively coupled plasma optical emission spectroscopy and infrared spectroscopy, to determine the dissolution mechanisms of the Bayer precipitate and the associated rate of dissolution in acetic, citric and oxalic acid environments. The Bayer precipitate is a mixture of hydrotalcite, calcium carbonate and sodium chloride that forms during the seawater neutralisation of Bayer liquors (waste residue of the alumina industry). The dissolution rate of a Bayer precipitate is found to be dependent on (1) the strength of the organic acid and (2) the number of donating H+ ions. The dissolution mechanism for a Bayer precipitate consists of several steps involving: (1) the dissolution of CaCO3, (2) formation of whewellite (calcium oxalate) when oxalic acid is used and (3) multiple dissolution steps for hydrotalcite that are highly dependent on the pH of solution. The decomposition of the Al–OH hydrotalcite layers resulted in the immediate formation of Al(OH)3, which is stable until the pH decreases below 5.5. This investigation has found that the Bayer precipitate is stable across a wide pH range in the presence of common organic acids found in the rhizosphere, and that initial decomposition steps are likely to be beneficial in supporting plant growth through the release of nutrients such as Ca2+ and Mg2+.
Publisher: Springer Science and Business Media LLC
Date: 10-06-2009
Publisher: Elsevier BV
Date: 11-2008
DOI: 10.1016/J.SAA.2007.12.030
Abstract: Spectral properties as a function composition are analysed for a series of selected pyromorphite minerals of Australian origin. The minerals are characterised by d-d transitions in NIR from 12,000 to 8000 cm(-1) (0.83-1.25 microm). A broad signal observed at approximately 10,000cm(-1) (1.00 microm) is the result of ferrous ion impurity in pyromorphites and follows a relationship between band intensity in the near-infrared spectra and ferrous ion concentration. The iron impurity causes a change in colour from green-yellow to brown in the pyromorphite s les. The observation of overtones of the OH(-) fundamentals, confirms the presence OH(-) in the mineral structure. The contribution of water-OH overtones in the NIR at 5100 cm(-1) (1.96 microm) is an indication of bonded water in the minerals of pyromorphite. Spectra in the mid-IR show that pyromorphite is a known mixed phosphate and arsenate complex, Pb5(PO4,AsO4)3Cl. A series of bands are resolved in the infrared spectrum of pyromorphite at 1017, 961 and 894 cm(-1). The first two bands are assigned to nu(3), the antisymmetric stretching mode and the third band at 894 cm(-1) is the symmetric mode of the phosphate ion. Similar patterns are shown by other pyromorphite s les with variation in intensity. The cause of multiple bands near 800 cm(-1) is the result of isomorphic substitution of (PO4)(3-) by (AsO4)(3-) and the spectral pattern relates to the chemical variability in pyromorphite. The presence of (AsO4)(3-) is significant in certain pyromorphite s les.
Publisher: Elsevier BV
Date: 10-2014
Publisher: Springer Science and Business Media LLC
Date: 2009
Publisher: Elsevier BV
Date: 03-2012
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 09-2012
DOI: 10.1016/J.SAA.2012.04.007
Abstract: The molecular structure of the mixed anion mineral clinotyrolite Ca(2)Cu(9)[(As,S)O(4)](4)(OH)(10)·10(H(2)O) has been determined by the combination of Raman and infrared spectroscopy. Characteristic bands associated with arsenate, sulphate and hydroxyl units are identified. Broad bands in the OH stretching region are observed and are resolved into component bands. Estimates of hydrogen bond distances were made using a Libowitzky function and both short and long hydrogen bonds are identified. Two intense Raman bands at 842 and ∼796 cm(-1) are assigned to the ν(1) (AsO(4))(3-) symmetric stretching and ν(3) (AsO(4))(3-) antisymmetric stretching modes. The comparatively sharp Raman band at 980 cm(-1) is assigned to the ν(1) (SO(4))(2-) symmetric stretching mode and a broad Raman spectral profile centred upon 1100 cm(-1) is attributed to the ν(3) (SO(4))(2-) antisymmetric stretching mode.
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.SAA.2011.07.015
Abstract: Aspects of the molecular structure of the mineral dorfmanite Na(2)(PO(3)OH)·2H(2)O were determined by Raman spectroscopy. The mineral originated from the Kedykverpakhk Mt., Lovozero, Kola Peninsula, Russia. Raman bands are assigned to the hydrogen phosphate units. The intense Raman band at 949 cm(-1) and the less intense band at 866 cm(-1) are assigned to the PO(3) and POH stretching vibrations. Bands at 991, 1066 and 1141 cm(-1) are assigned to the ν(3) antisymmetric stretching modes. Raman bands at 393, 413 and 448 cm(-1) and 514, 541 and 570 cm(-1) are attributed to the ν(2) and ν(4) bending modes of the HPO(4) units, respectively. Raman bands at 3373, 3443 and 3492 cm(-1) are assigned to water stretching vibrations. POH stretching vibrations are identified by bands at 2904, 3080 and 3134 cm(-1). Raman spectroscopy has proven very useful for the study of the structure of the mineral dorfmanite.
Publisher: Wiley
Date: 28-01-2011
DOI: 10.1002/JRS.2855
Publisher: American Chemical Society (ACS)
Date: 13-01-2011
DOI: 10.1021/IE101905B
Publisher: Wiley
Date: 2011
DOI: 10.1002/JRS.2612
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.SAA.2011.08.063
Abstract: The mineral arsentsumebite Pb(2)Cu(AsO(4))(SO(4))(OH), a copper arsenate-sulphate hydroxide of the brackebuschite group has been characterised by Raman spectroscopy. The brackebuschite mineral group are a series of monoclinic arsenates, phosphates and vanadates of the general formula A(2)B(XO(4))(OH,H(2)O), where A may be Ba, Ca, Pb, Sr, while B may be Al, Cu(2+),Fe(2+), Fe(3+), Mn(2+), Mn(3+), Zn and XO(4) may be AsO(4), PO(4), SO(4),VO(4). Bands are assigned to the stretching and bending modes of SO(4)(2-) AsO(4)(3-) and HOAsO(3) units. Raman spectroscopy readily distinguishes between the two minerals arsentsumebite and tsumebite. Raman bands attributed to arsenate are not observed in the Raman spectrum of tsumebite. Phosphate bands found in the Raman spectrum of tsumebite are not found in the Raman spectrum of arsentsumebite. Raman spectroscopy readily distinguishes the two minerals tsumebite and arsentsumebite.
Publisher: American Chemical Society (ACS)
Date: 26-08-2010
DOI: 10.1021/IE101104R
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.SAA.2011.08.062
Abstract: Some minerals are colloidal and are poorly diffracting. Vibrational spectroscopy offers one of the few methods for the assessment of the structure of these types of minerals. Among this group of minerals is zykaite with formula Fe(4)(AsO(4))(SO(4))(OH)·15H(2)O. The objective of this research is to determine the molecular structure of the mineral zykaite using vibrational spectroscopy. Raman and infrared bands are attributed to the AsO(4)(3-), SO(4)(2-) and water stretching vibrations. The sharp band at 3515 cm(-1) is assigned to the stretching vibration of the OH units. This mineral offers a mechanism for the formation of more crystalline minerals such as scorodite and bukovskyite. Arsenate ions can be removed from aqueous systems through the addition of ferric compounds such as ferric chloride. This results in the formation of minerals such as zykaite and pitticite (Fe(3+), AsO(4), SO(4), H(2)O).
Publisher: American Chemical Society (ACS)
Date: 07-12-2011
DOI: 10.1021/IE201700K
Publisher: Wiley
Date: 21-09-2009
DOI: 10.1002/JRS.2454
Publisher: Springer Science and Business Media LLC
Date: 10-09-2009
Publisher: Elsevier BV
Date: 12-2011
DOI: 10.1016/J.SAA.2011.08.058
Abstract: Some minerals are formed which show poorly defined X-ray diffraction patterns. Vibrational spectroscopy offers one of the few methods for the assessment of the structure of the oxyanions in such minerals. Among this group of minerals is mallestigite with formula Pb(3)Sb(5+)(SO(4))(AsO(4))(OH)(6)·3H(2)O. The objective of this research is to determine the molecular structure of the mineral mallestigite using vibrational spectroscopy. Raman and infrared bands are attributed to the AsO(4)(3-), SO(4)(2-) and water stretching vibrations. Mallestigite is a mineral formed in ancient waste dumps such as occurs at Mallestiger, Carinthia, Austria and as such is a mineral of archaeological significance.
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 13-02-2011
Publisher: Elsevier BV
Date: 06-2011
DOI: 10.1016/J.SAA.2011.02.001
Abstract: Near infrared (NIR), infrared (IR) spectroscopy and X-ray diffraction (XRD) have been applied to halotrichites of the formula FeAl(2)(SO(4))(4)·22H(2)O and Fe(2+)Fe(2)(3+)(SO(4))(4)·22H(2)O. Comparison of the halotrichites and their starting materials has been used to give a better understanding of the bonding involved in these types of minerals. The vibrational spectroscopy data has shown that Fe(2+) oxidises during the formation of halotrichite, no preventative measures were implemented to prevent oxidation, and this has been clearly shown by the position and broadness of electronic bands of transition metals in the NIR spectra (12,500-7500 cm(-1)). It is apparent from this region that Fe(3+) substitutes for Al(3+) in the synthesis of halotrichite. Due to the oxidation of Fe(2+) to Fe(3+) the halotrichite s le contains a small portion of bilinite. This has been confirmed by XRD, peaks at 9 and 14° 2θ were observed in the halotrichite s le and are identical to the XRD pattern obtained for bilinite. Substitution of aluminium for Fe(3+) has resulted in significant changes in the overall infrared and NIR spectral profiles. However, the lower wavenumber regions of the NIR spectra have very similar spectral profiles, which indicates a similar structure to halotrichite has formed for bilinite. This work has shown that iron halotrichites can be synthesised and characterised by infrared and NIR spectroscopy.
Publisher: Elsevier BV
Date: 2007
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 2009
Start Date: 01-2012
End Date: 12-2015
Amount: $375,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2016
End Date: 12-2021
Amount: $325,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2022
End Date: 10-2026
Amount: $475,185.00
Funder: Australian Research Council
View Funded Activity