ORCID Profile
0000-0002-2806-2604
Current Organisation
Curtin University
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Publisher: Sociedade Brasileira de Quimica (SBQ)
Date: 2017
Publisher: Wiley
Date: 07-09-2020
Publisher: Elsevier BV
Date: 12-2016
DOI: 10.1016/J.JINORGBIO.2016.08.001
Abstract: Herein, the design and syntheses of two new mononuclear oxindolimine-copper(II) (1 and 2) and corresponding heterobinuclear oxindolimine Cu(II)Pt(II) complexes (3 and 4), are described. All the isolated complexes were characterized by spectroscopic techniques (UV/Vis, IR, EPR), in addition to elemental analysis and mass spectrometry. Cyclic voltammetry (CV) measurements showed that in all cases, one-electron quasi-reversible waves were observed, and ascribed to the formation of corresponding copper(I) complexes. Additionally, waves related to oxindolimine ligand reduction was verified, and confirmed using analogous oxindolimine-Zn(II) complexes. The Pt(IV/II) reduction, and corresponding oxidation, for complexes 3 and 4 occurred at very close values to those observed for cisplatin. By complementary fluorescence studies, it was shown that glutathione (GSH) cannot reduce any of these complexes, under the experimental conditions (room temperature, phosphate buffer 50mM, pH7.4), using an excess of 20-fold [GSH]. All these complexes showed characteristic EPR spectral profile, with parameters values g
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA04363C
Abstract: A new reactive carbonate composite based on SrCO 3 is presented as a material with high energy density for thermochemical energy storage, being an excellent material to meet the requirement for stable power generation from renewable sources.
Publisher: FapUNIFESP (SciELO)
Date: 25-08-2016
DOI: 10.1590/0001-3765201620140656
Abstract: The adsorption of Violet Remazol 5R (VR 5) on wood sawdust modified with succinic anhydride (SSA) as a function of contact time, pH, and initial dye concentrations was investigated using a batch technique under ambient conditions. The SSA obtained was confirmed by IR spectroscopy, thermogravimetry and 13C NMR, and degrees of substitution (DS) were calculated. A study on the effect of the pH on the adsorption of VR 5 showed that the optimum pH was 2.0. The interactions were assayed with respect to the pseudo-first-order and pseudo-second-order kinetic models, and were found to follow closely the pseudo-second-order. The isotherm was adjusted to the Langmuir, the Freundlich and the Temkin sorption models. SSA is a promising material for the removal of dye textile from aqueous solutions, and under conditions studied the removal percentage achieved was 51.7%.
Publisher: Elsevier BV
Date: 07-2010
Publisher: Wiley
Date: 07-08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2RA00935H
Publisher: Wiley
Date: 11-08-2020
Publisher: Elsevier BV
Date: 09-2011
Publisher: FapUNIFESP (SciELO)
Date: 03-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NJ04799A
Abstract: Schiff base-copper( ii ) and zinc( ii ) complexes were prepared and characterized, and their binding ability to DNA and cytotoxicity against healthy and carcinogenic cells were studied.
Publisher: Springer Science and Business Media LLC
Date: 18-11-2015
Publisher: Elsevier BV
Date: 02-2010
DOI: 10.1016/J.JHAZMAT.2009.09.109
Abstract: A new synthetic methodology route consisted in reacting the natural babassu coconut mesocarp (BCM) and babassu coconut epicarp (BCE) with ethylenesufide, for adding basic sulfur centers in pendant chains that possess high potential activity for coordinating alent cations from aqueous solution. All biomaterials were characterized by elemental analysis, infrared (IR), (13)C NMR and thermogravimetry. The sulfur elemental analysis gave 2.00+/-0.05 and 8.67+/-0.01% for BCES and BCMS, which correspond to 0.60+/-0.01 and 2.71+/-0.01 mmol of this element per each gram of BCE and BCM, to confer a degree of functionalization of 20.2+/-0.07 and 86.7+/-0.01 mg g(-1). This synthesis enabled from IR weak SH band at 2544 cm(-1) due to the incorporation of the reagent into the structure. The basic centers favor copper sorption with increasing pH from 2 to 6 observed by a batchwise methodology and the data obtained from the chosen pH 6 were adjusted to Freundlich and Langmuir models, favoring fit for the latter equation. The kinetics of sorption was established at 30 min for both biopolymers with a pseudo-second-order model.
Publisher: Elsevier BV
Date: 30-07-2009
DOI: 10.1016/J.JHAZMAT.2008.12.043
Abstract: Extracted babassu coconut (Orbignya speciosa) mesocarp (BCM) was applied as a biosorbent for aqueous Blue Remazol R160 (BR 160), Rubi S2G (R S2G), Red Remazol 5R (RR 5), Violet Remazol 5R (VR 5) and Indanthrene Olive Green (IOG) dye solutions. The natural sorbent was processed batchwise while varying several system parameters such as stirring time, pH and temperature. The interactions were assayed with respect to both pseudo-first-order and second-order reaction kinetics, with the latter the more suitable kinetic model. The maximum adsorption was obtained at pH 1.0 for all dyes due to available anionic groups attached to the structures, which can be justified by pH(pzc) 6.7 for the biosorbent BCM. The ability of babassu coconut mesocarp to adsorb dyes gave the order R S2G>VR 5>BR 160>IOG>RR 5, which data were best fit to Freundlich model, but did not well-adjusted for all dyes. The dye/biopolymer interactions at the solid/liquid interface are all spontaneous as given by free Gibbs energy, with exothermic enthalpic values of -26.1, -15.8, -17.8, -15.8 and -23.7 kJ mol(-1) for BR 160, R S2G, RR 5, IOG and VR 5, respectively. In spite of the negative entropic values contribution, the set of thermodynamic data is favorable for all dyes removal. However, the results pointed to the effectiveness of the mesocarp of babassu coconut as a biosorbent for removing textile dyes from aqueous solutions.
Publisher: American Chemical Society (ACS)
Date: 30-07-2013
DOI: 10.1021/IE303409B
Publisher: Hindawi Limited
Date: 12-2009
Publisher: Wiley
Date: 07-09-2020
Publisher: FapUNIFESP (SciELO)
Date: 03-2014
Publisher: Elsevier BV
Date: 2013
DOI: 10.1016/J.IJBIOMAC.2012.09.013
Abstract: The biopolymer chitosan was chemically modified in two sequences of reactions: (i) immobilization of methyl acrylate followed by cysteamine and (ii) the sequence of immobilization reactions involving ethylene sulfide, methyl acrylate and finally cysteamine. In both cases the pendant chains have attached nitrogen, oxygen and sulfur basic centers. The corresponding structures were characterized through elemental analysis, infrared spectroscopy, nuclear magnetic resonance in the solid state for carbon, thermogravimetry and scanning electron microscopy. The newly synthesized biopolymers have abilities to immobilize and controllably release the non-steroidal drug ibuprofen. The ibuprofen-loaded biomaterials as tablets or as films crosslinked with glutaraldehyde revealed that drug release is pH sensitive. The chemically modified chitosan may allow reduction of drug release in stomach fluids, since the functional groups cause a decrease in swelling rate at pH 1.2, opposite to the behavior that occurs at pH 7.4, that of nutritional fluid, where an increase of the rate of swelling occurs. In such conditions the negatively charge ibuprofen is electrostatically repelled by negative chitosan derivative surfaces.
Publisher: Springer Science and Business Media LLC
Date: 03-05-2013
No related grants have been discovered for Adriana Pires Vieira.