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RISS 인기검색어
- 검색키워드
- 저자 : W.N.W. Salleh (검색결과 4 건)
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Matrimid-based carbon tubular membrane: Effect of carbonization environment
N. Sazali,W.N.W. Salleh,N.A.H.M. Nordin,A. F. ISMAIL 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
Among gas separation materials, carbon membrane exhibits the most interesting performance in termsof selectivity, stability, and gas permeance. By controlling and optimizing carbonization environment,excellent gas separation performances can be achieved. In this study, tubular supported carbonmembrane was prepared using Matrimid as polymeric precursor. In order to produce high performancecarbon membrane, the effect of carbonization conditions on the gas permeation properties wasinvestigated. The polymer solution was coated on the surface of the tubular support by using dip-coatingmethod. Carbon membranes were fabricated by heat treatment process under controlled carbonizationenvironments; Ar or N2. Pure gas permeation tests were performed using CO2, CH4, and N2 at roomtemperature with pressure 8 bar. Based on the results, the highest CO2/CH4 and selectivity of 87.34 andCO2/N2 selectivity of 79.60 were obtained by carbon membrane carbonized under Ar gas. Despite thehigher carbonization temperature, the carbonization under Ar created more permeable pores ascompared to N2 environment.
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N.H. Ismail,W.N.W. Salleh,N. Sazali,A.F. Ismail 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Different dope solutions for the alumina disk supported carbon membrane preparation for CO2/N2 and CO2/CH4 separation was formulated in this study. The prepared polymeric membrane made of commercial co-polyimide BTDA-TDI/MDI (P84) was carbonized at 700 °C under N2 gas flow. A defect-free membrane was obtained when high polymer composition was used. The disk supported carbon membrane with CO2/N2 and CO2/CH4 selectivity of 15 and 45, respectively, and CO2 permeance of 400 Barrer were obtained by one-step spray coating technique. The polymer composition of 12 wt% was concluded to be the optimum composition for the alumina disk supported carbon membranes.
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Tajuddin M.H.,Yusof N.,Fajrina N.,Salleh W.N.W.,Ismail A.F.,Jaafar J.,Aziz F. 한국물리학회 2022 Current Applied Physics Vol.34 No.-
This current paper presented a new candidate and potentially to improve the current membrane materials in water filtration process. With that, the primary materials used in this research study is layered double hydroxides (LDH) nanoclay which can be obtained from earth minerals and self-synthesized from inorganic salts were discussed thoroughly to help a better understanding of these materials. However, the current technologies of water separation were still lagging behind and ineffective especially in removal of divalent metal ions and multivalent salts. Infeasibility of reverse osmosis membrane make it not a viable option for divalent salts filtration. With that, nanofiltration (NF) membrane offered as an alternative to substitute available method. In this study, thin film nanocomposite (TFN) membranes were fabricated by incorporating layered double hydroxides (LDH) nanoclay. The LDH nanoclay with different loading ratio of 0, 0.05, 0.1, 0.15 and 0.2 were impregnated into polyamide layer on top of polysulfone substrates. The fabricated TFN were characterized in terms of physicochemical properties (SEM and FTIR) and membrane hydrophilicity (contact angle). After the addition of LDH, the morphological structures of TFN membranes were changed and the surface hydrophilicity was enhanced significantly. FESEM images displayed a typical ridge and valley morphology with nodule-like structures. As the LDH loading was increased, the contact angle decreased from 34.56◦ to 15.76◦ showing the surface hydrophilicity of membrane is improved. The separation performance of membrane was evaluated in terms of salt rejection ability by cross flow filtration system. The best performance NF membrane was found to be TFN 0.05 with high water flux and MgCl2 rejection with values of 24.18 L/m2.h and 91% respectively. This study has experimentally validated the potential of LDH materials in membrane process for improvement in water separation process.
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Sohaimi Khairunissa Syairah Ahmad,Jaafar Juhana,Dharma Hadi Nugraha Cipta,Samuel Ojo,Ismail A. F.,Othman M. H. D.,Rahman Mukhlis A.,Aziz F.,Salleh W. N. W. 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3
In this research, an innovative Z-scheme vanadium pentoxide (V 2 O 5 )/graphitic carbon nitride (g-C 3 N 4 ) photocatalyst was synthesised using a facile thermal treatment method, and its photodegradation performance and physicochemical properties were evaluated. The heterostructure provided high Brunauer–Emmett–Teller surface area and pore volume, which encouraged charge carrier separation and transfer, as well as supplied abundant micro-mesoporous structures and active sites for photocatalytic redox reactions. The successful incorporation of V 2 O 5 between g-C 3 N 4 layers can be proven by proposing the synthesis mechanism, as well as conducting morphology, crystal structure, elemental, and chemical analysis through scanning electron microscopy, X-ray diff raction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy, respectively. Using these combined photocatalysts, ciprofl oxacin (CIP) was successfully degraded up to 90.17% removal effi ciency in the visible-light spectrum. The superior photocatalytic activity of g-C 3 N 4 composite over V 2 O 5 is primarily due to its increased light absorption capacity, as well as increased surface area, pore size, and volume, eff ective charge transfer, and optimal band alignment between g-C 3 N 4 and V 2 O 5 . This research provides a signifi cant future perspective for the utilisation of Z-scheme V 2 O 5 /g-C 3 N 4 heterojunction photocatalyst for water treatment, especially those involving endocrine-disrupting compounds and antibiotics like CIP.
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