ORCID Profile
0000-0002-6821-8116
Current Organisation
Institut Teknologi Sepuluh Nopember Fakultas Matematika dan Ilmu Pengetahuan Alam
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Publications
CORRELATION BETWEEN PROTON CONDUCTIVITY, HYDROPHILICITY, AND THERMAL STABILITY OF CHITOSAN/MONTMORILLONITE COMPOSITE MEMBRANE MODIFIED GPTMS AND THEIR PERFORMANCE IN DIRECT METHANOL FUEL CELL
Publisher: Penerbit Universiti Kebangsaan Malaysia (UKM Press)
Date: 21-06-2017
Crystal Phase and Surface Morphology of Zeolite-Y Templated Carbon with K<sub>2</sub>CO<sub>3</sub> and ZnCl<sub>2</sub> Activation
Publisher: Universitas Gadjah Mada
Date: 12-11-2015
DOI: 10.22146/IJC.21201
Abstract: Zeolite-Y templated carbon (ZTC) has been activated with K2CO3 and ZnCl2. This research aims to compare the characteristics of ZTC with K2CO3 and ZnCl2 activation. ZTC was synthesized via impregnation method followed by carbonization. In this research, activation process was conducted at variation of activator/carbon weight ratio of 1 and 1.50. The activation was carried out by heating up impregnated carbon at 800 °C for 1 h followed by washing to remove inorganic salt. XRD and SEM results indicate that the use of different activator produce ZTC with varied structure and morphology. Diffractogram results showed that the graphitic peak decreased due to K2CO3 activation, whereas graphitic peak increased owing to ZnCl2 activation. Decreasing the graphitic peak indicates that ZTCs have higher pore structure formation. In addition, surface formation of ZTC activated by K2CO3 was higher than by ZnCl2 activation. The higher pore structure formation means the amount of carbon deposited on external surface material was decreased.
Performance of a membrane fabricated from high-density polyethylene waste for dye separation in water
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2RA07595D
Abstract: Industrial growth can have a good impact on a country's economic growth, but it can also cause environmental problems, including water pollution.
POLY(EUGENOL SULFONATE) - SULFONATED POLYETHERIMIDE NEW BLENDS MEMBRANE PROMISING FOR DIRECT METHANOL FUEL CELL
Publisher: Penerbit Universiti Kebangsaan Malaysia (UKM Press)
Date: 21-06-2017
The Modification of PVDF Membrane via Crosslinking with Chitosan and Glutaraldehyde as the Crosslinking Agent
Publisher: Universitas Gadjah Mada
Date: 28-02-2018
DOI: 10.22146/IJC.25127
Abstract: Poly(vinylidene fluoride) (PVDF) has outstanding properties such as high thermal stability, resistance to acid solvents and good mechanical strength. Due to its properties, PVDF is widely used as a membrane matrix. However, PVDF membrane is hydrophobic properties, so as for specific applications, the surface of membrane needs to be modified to become hydrophilic. This research aims to modify PVDF membrane surface with chitosan and glutaraldehyde as a crosslinker agent. The FTIR spectra showed that the modified membrane has a peak at 1655 cm-1, indicating the imine group (–N=C)- that was formed due to the crosslink between amine group from chitosan and aldehyde group from glutaraldehyde. Results showed that the contact angle of the modified membrane decreases to 77.22° indicated that the membrane hydrophilic properties ( 90°) were enhanced. Prior to the modification, the contact angle of the PVDF membrane was 90.24°, which shows hydrophobic properties ( 90°). The results of porosity, Ɛ (%) for unmodified PVDF membrane was 55.39%, while the modified PVDF membrane has a porosity of 81.99%. Similarly, by modifying the PVDF membrane, pure water flux increased from 0.9867 L/m2h to 1.1253 L/m2h. The enhancement of porosity and pure water flux for the modified PVDF membrane was due to the improved surface hydrophilicity of PVDF membrane.
Synthesis of Zeolite-X Supported On Glasswool for CO<sub>2</sub> Capture Material: Variation of Immersion Time and NaOH Concentration at Glasswool Activation
Publisher: Universitas Gadjah Mada
Date: 15-03-2018
DOI: 10.22146/IJC.21169
Abstract: Zeolite X supported on fiber material (glasswool) was successfully synthesized using a simple hydrothermal method. Variation of immersion time and NaOH concentration were used for glasswool activation. Activation process of glasswool has effects toward crystallinity and growth of zeolite X on glasswool surface. The results of characterization using XRD, SEM and AFM showed that zeolite X crystal grew on glasswool surface with high crystallinity using NaOH concentration 4M for 24 h. BET surface area and pore characteristics were analyzed by N2 isothermal adsorption. Carbon dioxide adsorption measurement using gravimetric method showed that zeolite X supported on glasswool has capability to capture carbon dioxide at room temperature up to 2.83 weight %.
Preparation of polyvinylidene fluoride/cellulose acetate blend membrane with polyethylene glycol additive for apple juice clarification
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4978164
Impregnation Nickel on Mesoporous ZSM-5 Templated Carbons as a Candidate Material for Hydrogen Storage
Publisher: Universitas Gadjah Mada
Date: 04-2017
DOI: 10.22146/IJC.23563
Abstract: A series of carbon with ZSM-5 mesoporous (ZMC) and Ni/ZMC ZSM-5 templates were synthesized and gravimetrically known its adsorption capacity to H2 gases. ZMC carbon was synthesized using a hard template method at a carbonation temperature of 900 oC with sucrose as a source of carbon. A mesoporous ZSM-5 template was synthesized by using a hydrothermal method at an aging and crystallization temperature of respectively 60oC and 150oC for as long as 24 hours. The characterized result of ZMC carbon using XRD powder has shown a diffracted pattern of amorphous carbon. Impregnating Ni with ZMC carbon each resulted in 5%, 15% and 25% of weight, which in turn also resulted in a diffractogram pattern of Ni/ZMC-5, Ni/ZMC-15, and Ni/ZMC-25, where each patterns were uniform and had no additional peaks. The results of SEM-EDAX showed that Ni had been successfully impregnated on the surface of ZMC carbon with a random morphology surface of ZMC carbon. The isothermal results of adsorption – desorption of N2 showed that the larger the Ni loading on the supporting ZMC carbon, the smaller the surface area of the ZMC specific carbon. The distribution of the pore size that was counted by using the BJH method, which was applied to all the s les, was as big as 3,8 nm. The adsorption capacity of H2 was measured by using the gravimetry method at ambient temperature for Ni/ZMC-5, Ni/ZMC-15, and Ni/ZMC-25, which each gave a weight percentage of 0,331% 0,663% and 0,649% respectively, whilst the ZMC carbon has a weight of 2,18%.
Mesoporous WO3/TiO2 Nanocomposites Photocatalyst for Rapid Degradation of Methylene Blue in Aqueous Medium
Publisher: International Digital Organization for Scientific Information (IDOSI)
Date: 10-2019
Adsorption-desorption of CO 2 on zeolite-Y-templated carbon at various temperatures
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA09200A
Abstract: A micro-mesoporous structure of ZTC was synthesized via an impregnation method, and the structure assisted in a faster CO 2 adsorption–desorption equilibrium.
The Effect of Silane Addition on Chitosan-Fly Ash/CTAB as Electrolyte Membrane
Publisher: IOP Publishing
Date: 02-2017
Prospects of nanocomposite membranes for natural gas treatment
Publisher: Elsevier
Date: 2020
Synthesis of Zeolite-X Supported on Kapok Fiber for CO<sub>2</sub> Capture Material: Variation of Immersion Time during Fiber Activation
Publisher: Universitas Gadjah Mada
Date: 30-11-2017
DOI: 10.22146/IJC.25162
Abstract: Zeolite-X is a potential material for CO2 adsorption. To increase the performance of zeolite-X, kapok fiber was used as a support material. The growth of zeolite-X on the surface of kapok was affected by activation of the surface. This research aims to optimize the immersion time of kapok fiber using NaOH in order to achieve high crystallinity of the zeolite-X. The Zeolite-X supported on kapok fiber was synthesized by the simple hydrothermal method at immersion time variation of 12 to 36 h. XRD results show that zeolite-X on kapok surface has the highest crystallinity at immersion time of 24 h. The topography of kapok surface from AFM indicates that the surface was damaged due to peeling reaction of NaOH. SEM results show that zeolite-X has grown on the kapok surface in considerable amounts. From TGA analysis, it was shown that the thermal stability of zeolite-X supported on kapok surface was up to 300 °C. Adsorption of CO2 measured by gravimetric method shows that CO2 adsorption capacitywas up to 15.097 wt.% at room temperature.
Polysulfone mixed matrix hollow fiber membranes using zeolite templated carbon as a performance enhancement filler for gas separation
Publisher: Elsevier BV
Date: 10-2019
Solvent selection in membrane preparation from polyethylene terephthalate plastic waste: computational and experimental study
Publisher: IOP Publishing
Date: 12-2022
Abstract: The selection of the solvent during the membrane preparation process significantly affects the characteristics of the resulting membrane. The large number of organic solvents available for dissolving polymers renders this experimental approach ineffective. A computational approach can select a solvent using the solvation energy value approach. In addition, no organic waste is generated from the computational approach, which is a distinct advantage. A computational approach using the DFT/B3LYP/def2-TZVP RIJCOSX method was used to optimize the structure of polyethylene terephthalate (PET). The PET for the experiment was obtained from the utilization of plastic bottle waste. In addition, a review of the thermodynamics, geometry, HOMO-LUMO orbitals, and vibrational frequencies was conducted to validate the PET molecule against the experimental results. A conductor-like polarizable continuum model was used to determine the best solvent for dissolving the PET plastic waste. The results demonstrated that the Fourier Transform Infra-Red and Fourier Transform Raman spectra obtained from computational calculations were not significantly different from the experimental results. Based on a thermodynamic approach, computationally the Gibbs free energy (−724.723), entropy (0.0428), and enthalpy (−724,723 Kjmol −1 ) values of the PET dimer molecule are not much different from the experimental values (−601, 0.042, and −488 Kjmol −1 ). The computational approach was successful in selecting solvents that can dissolve PET plastic bottle waste. Phenol solvent has the lowest solvation energy value (−101.879 Kjmol −1 ) and the highest binding energy (2.4 Kjmol −1 ) than other solvents. Computational and experimental results demonstrated that the phenol solvent was able to dissolve PET plastic bottle waste better than the other solvents.
P84/Zeolite-Carbon Composite Mixed Matrix Membrane for CO<sub>2</sub>/CH<sub>4</sub> Separation
Publisher: Universitas Gadjah Mada
Date: 29-05-2019
DOI: 10.22146/IJC.35727
Abstract: Mixed Matrix Membranes (MMMs) which consist of 0.3 wt.% Zeolite-Carbon Composite (ZCC) dispersed in BTDA-TDI/MDI (P84 co-polyimide) have been prepared through phase inversion method by using N-methyl-2-pyrrolidone (NMP) as a solvent. Membranes were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Thermogravimetric Analysis (TGA), and Fourier Transform Infrared (FTIR). Membrane performance was measured by a single gas permeation of CO2 and CH4. The maximum permeability of CO2 and CH4, which up to 12.67 and 6.03 Barrer, respectively. P84/ZCC mixed matrix membrane also showed a great enhancement in ideal selectivity of CO2/CH4 2.10 compared to the pure P84 co-polyimide membrane.
Biopolymer-based electrolyte membranes from chitosan incorporated with montmorillonite-crosslinked GPTMS for direct methanol fuel cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5RA22420A
Abstract: A composite membrane was fabricated from biopolymer chitosan and montmorillonite (MMT) filler as an alternative membrane electrolyte for direct methanol fuel cell (DMFC) application.
Synthesis Of Zeolite X-carbon From Coal Bottom Ash For Hydrogen Storage Material
Publisher: International Association of Advanced Materials
Date: 08-2014
Solvothermal and electrochemical synthetic method of HKUST-1 and its methane storage capacity
Publisher: IOP Publishing
Date: 05-02-2016
Decreasing free fatty acid of crude palm oil with polyvinylidene fluoride hollow fiber membranes using a combination of chitosan and glutaraldehyde
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2RA04005K
Abstract: Crude palm oil (CPO) has emerged as a significant commodity in the economic and social development of producer nations.
DUT-5 modified Pd metal-nanoparticles: synthesis, chemical stability, and hydrogen sorption studies
Publisher: IOP Publishing
Date: 10-01-2020
Combined Computational and Experimental Study the Effect of Doped Magnesium into Betanine-sensitized TiO<sub>2</sub> Photoanode for Dye-Sensitized Solar Cells Application
Publisher: Universitas Gadjah Mada
Date: 13-08-2019
DOI: 10.22146/IJC.36861
Abstract: A preliminary study of the effect of magnesium-doped into betanine-sensitized TiO2 thin layers has been carried out computationally and experimentally. The computational calculation was performed to observe the effect of magnesium on the interaction molecular of betanine onto TiO2 surface, using Ti12O28H8 model cluster. It was found out that the distance of the oxygen on the anchoring site betanine with the Ti in TiO2/Mg cluster is shortercompare to that one in TiO2 cluster. This result confirms the bond between betanine and TiO2 is stronger in the case of Mg2+ incorporation. The Natural Population Calculation also confirms that the electron transport from betanine to the TiO2 is more facilitated after Mg2+ incorporation. These results are also supported by the HOMO-LUMO profile of TiO2-betanine and TiO2/Mg. The XRD and SEM measurement confirm those are no effect on the TiO2 structure and morphology with the incorporation of Mg2+. The thin-film UV-Vis measurement confirms there is a bandgap sift after the incorporation of Mg.
Fabrication of Mixed Matrix Membrane Polysulfone - Zeolite Carbon Composites (ZCC) For Gas Separation
Publisher: IOP Publishing
Date: 06-2019
DOI: 10.1088/1757-899X/546/4/042020
Abstract: Mixed matrix membrane polysulfone (PSF) - zeolite carbon composite (ZCC) was successfully fabricated in this study. The composition of ZCC as a filler in this membrane was 1%. Mixed matrix membrane PSF-ZCC 1 wt% was compared by neat polysulfone membrane. The prepared membranes were characterized using XRD to determine the membrane structure and FTIR to determine the functional groups in the membrane. The results of gas permeation for membrane permeability of O 2 were 4.011 and 7.193 GPU for neat PSF and PSF-ZCC 1 wt% membrane, respectively. In addition, the permeability value of N 2 was 5.603 and 7.862 GPU for neat PSF and PSF-ZCC 1 wt% membrane, respectively. Selectivities of O 2 /N 2 for neat PSF and PSF-ZCC 1 wt% membrane were 0.715 and 0.914, respectively. The increasing permeability along with the addition of ZCC filler indicated that the membrane in this study is potentially applied for O 2 and N 2 separation.
Simple Method to Enhance O2/N2 Separation on P84 co-polyimide Hollow Fiber Membrane
Publisher: IOP Publishing
Date: 06-2019
DOI: 10.1088/1757-899X/546/4/042042
Abstract: In this study, a simple coating technique to enhance the selectivity performance of P84 co-polyimide hollow fiber polymer membrane was investigated. The hollow fiber membrane was coated with polydimethylsiloxane (PDMS) to prevent gas flow through the defect surface. The prepared membranes were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and pure gas permeation measurement. The pure gas of O 2 and N 2 were used to determine the permeation properties of the hollow fiber membrane. The single gas measurement showed that the perm-selectivity of O 2 /N 2 of the hollow fiber membrane increased up to 181% after the coating treatment. It is concluded that the simple coating technique has significant effect in enhancing the selectivity performance of the hollow fiber membrane.
A Review of Titanium Dioxide (TiO2)-Based Photocatalyst for Oilfield-Produced Water Treatment
Publisher: MDPI AG
Date: 19-03-2022
DOI: 10.3390/MEMBRANES12030345
Abstract: Oilfield produced water (OPW) has become a primary environmental concern due to the high concentration of dissolved organic pollutants that lead to bioaccumulation with high toxicity, resistance to biodegradation, carcinogenicity, and the inhibition of reproduction, endocrine, and non-endocrine systems in aquatic biota. Photodegradation using photocatalysts has been considered as a promising technology to sustainably resolve OPW pollutants due to its benefits, including not requiring additional chemicals and producing a harmless compound as the result of pollutant photodegradation. Currently, titanium dioxide (TiO2) has gained great attention as a promising photocatalyst due to its beneficial properties among the other photocatalysts, such as excellent optical and electronic properties, high chemical stability, low cost, non-toxicity, and eco-friendliness. However, the photoactivity of TiO2 is still inhibited because it has a wide band gap and a low quantum field. Hence, the modification approaches for TiO2 can improve its properties in terms of the photocatalytic ability, which would likely boost the charge carrier transfer, prevent the recombination of electrons and holes, and enhance the visible light response. In this review, we provide an overview of several routes for modifying TiO2. The as-improved photocatalytic performance of the modified TiO2 with regard to OPW treatment is reviewed. The stability of modified TiO2 was also studied. The future perspective and challenges in developing the modification of TiO2-based photocatalysts are explained.
Adsorption-desorption of CO2 and H2 gases on zeolite-X supported on glass fiber
Publisher: Author(s)
Date: 2018
DOI: 10.1063/1.5082488
Modification of zeolite-Y templated carbon at various nitrogen loading for hydrogen adsorption
Publisher: Author(s)
Date: 2018
DOI: 10.1063/1.5082489
Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO 2 /CH 4 and H 2 /CH
Publisher: The Royal Society
Date: 06-2022
DOI: 10.1098/RSOS.211371
Abstract: Recently, natural gas (mostly methane) is frequently used as fuel, while hydrogen is a promising renewable energy source. However, each gas produced contains impurity gases. As a result, membrane separation is required. The mixed matrix membrane (MMM) is a promising membrane. The huge surface area and well-defined pore structure of zeolite templated carbon (ZTC)-based MMM allow for effective separation. However, the interfacial vacuum in MMM is difficult to avoid, contributing to poor separation performance. This research tries to improve separation performance by altering membrane surfaces. MMM PSF/ZTC was modified by annealing at 120, 150, and 190°C coating using 0.01, 0.03, and 0.05 mol tetramethyl orthosilicate (TMOS) and a combination of both, i.e. annealing at 190°C and coating using 0.03 mol TMOS. MMM PSF/ZTC successfully significantly improved CO 2 /CH 4 selectivity by a combination of annealing at 190°C and coating 0.03 mol TMOS from 1.37 to 5.90 (331%), and H 2 /CH 4 selectivity by coating with 0.03 mol TMOS from 4.58 to 65.76 (1378%). The enhancement of selectivity was due to structural changes to the membrane that became denser and smoother, which SEM and AFM observed. In this study, annealing and coating treatments are the methods investigated for improving the polymer matrix and filler particle adhesion.
Modification of chitosan membranes with nanosilica particles as polymer electrolyte membranes
Publisher: American Institute of Physics
Date: 2016
DOI: 10.1063/1.4945491
SYNTHESIS OF ZEOLITE NaY FROM DEALUMINATED METAKAOLIN AS Ni SUPPORT FOR CO2 HYDROGENATION TO METHANE
Publisher: Springer Science and Business Media LLC
Date: 10-2020
The potential application of natural zeolite for greywater treatment
Publisher: Elsevier BV
Date: 2008
Synergistic effect of modified pore and heterojunction of MOF-derived α-Fe2O3/ZnO for superior photocatalytic degradation of methylene blue
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2RA07946A
Abstract: Mesoporous heterojunction MOF-derived α-Fe 2 O 3 /ZnO composites were prepared by a simple calcination of α-Fe 2 O 3 /ZIF-8 as a sacrificial template.
Hydrogen Adsorption Characteristics for Zeolite-Y Templated Carbon
Publisher: Universitas Gadjah Mada
Date: 31-12-2019
DOI: 10.22146/IJC.38978
Abstract: The hydrogen adsorption, kinetic and thermodynamic of adsorption onto the zeolite templated carbon (ZTC) were examined at the temperature range of 30-50 °C and ambient pressure. The ZTC was prepared from zeolite-Y template and sucrose carbon precursor by impregnation method and showed its specific surface area of 932 m2/g as well as 0.97 cm3/g for total pore volume. Analysis of physical and chemical characteristics for materials were performed using XRD, SEM, TEM and N2 isotherm. The results indicated that the ZTC has some ordered network structure of carbon and also exhibits the formation of carbon layer outside the zeolite micropore. We observed the ZTC for hydrogen adsorption both gravimetric and volumetric method up to 1.72 and 1.16 wt.% at the lowest temperature, respectively. The kinetic process at all studied temperature was best approximated by pseudo second order kinetic model. The aspects of thermodynamic such as heat of adsorption and the entropy change were -14.41 kJ/mol and -40.93 J/K mol, respectively. Both values was negative, indicating an exothermic reaction and low disorder at the hydrogen and ZTC interface, when the adsorption process took place. While, the enthalpy change value exhibits characteristic of physical process. The Gibbs energy change calculated at 30, 40 and 50 °C were -1.99, -1.59 and -1.19 kJ/mol, respectively, indicating a spontaneous adsorption process.
Development of a P84/ZCC Composite Carbon Membrane for Gas Separation of H2/CO2 and H2/CH4
Publisher: American Chemical Society (ACS)
Date: 07-06-2021
Synthesis of Zeolite-X from Bottom Ash for H2Adsorption
Publisher: IOP Publishing
Date: 2018
Enhanced CO2methanation at mild temperature on Ni/zeolite from kaolin: effect of metal–support interface
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1RA01014J
Abstract: Different Na-zeolites as supports of Ni metal were successfully synthesized from kaolin-based material. Combination of interfacial interaction Ni-support and surface basicity promoted CO 2 methanation reaction at a low temperature of ∼200 °C.
Removal of ammonium from greywater using natural zeolite
Publisher: Elsevier BV
Date: 08-2011
P84/ZCC Hollow Fiber Mixed Matrix Membrane with PDMS Coating to Enhance Air Separation Performance
Publisher: MDPI AG
Date: 28-09-2020
DOI: 10.3390/MEMBRANES10100267
Abstract: This research introduces zeolite carbon composite (ZCC) as a new filler on polymeric membranes based on the BTDA-TDI/MDI (P84) co-polyimide for the air separation process. The separation performance was further improved by a polydimethylsiloxane (PDMS) coating to cover up the surface defect. The incorporation of 1 wt% ZCC into P84 co-polyimide matrix enhanced the O2 permeability from 7.12 to 18.90 Barrer (2.65 times) and the O2/N2 selectivity from 4.11 to 4.92 Barrer (19.71% improvement). The PDMS coating on the membrane further improved the O2/N2 selectivity by up to 60%. The results showed that the incorporation of ZCC and PDMS coating onto the P84 co-polyimide membrane was able to increase the overall air separation performance.
Combination of microbial fuel cell and zeolite Na-Y adsorption for chromium removal
Publisher: Author(s)
Date: 2018
DOI: 10.1063/1.5082478
Related Organisations
Institut Teknologi Sepuluh Nopember Fakultas Matematika Dan Ilmu Pengetahuan Alam
Location: Indonesia
Related Funding Activities
No related grants have been discovered for Nurul Widiastuti.