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- 저자 : Oh Pei Ching (검색결과 3 건)
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Moau Jian Toh,Pei Ching Oh,Abdul Latif Ahmada,Julien Caille 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.11
Membrane gas-liquid separation technology has been widely employed in membrane filtration, distillation, and gas absorption, attributed to its high mass transfer efficiency. However, hydrophobic membranes may suffer from pore wetting at low operational pressure difference, leading to the deterioration of removal flux. Hence, anti-wetting strategy via membrane surface modification to improve its intrinsic hydrophobicity needs to be investigated. In this work, modified superhydrophobic polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) membrane was synthesized via non-solvent induced phase separation. Polydimethylsilane-grafted-silica (PGS) nanoparticles with non-polar Si-O-Si bonds were used as surface modifier in coagulation bath to enhance membrane surface hydrophobicity. Results demonstrated that the addition of nanoparticles improved the surface roughness via formation of hierarchical structure. Additionally, the deposition of nanoparticles on polymer spherulites significantly reduced the surface free energy. As a result, modified membranes achieved superhydrophobicity with water contact angle exceeding 150o. The stability tests also showed that the deposition layer of modified membrane was mechanically and thermally robust. This superhydrophobic modification by PGS nanoparticles is an advanced and facile approach to alleviate membrane wetting.
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Sie Hao Ding,Pei Ching Oh,Asif Jamil 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
Improper control of air gap interval during hollow fiber membranes (HFMs) spinning may lead to structuraldefects such as inner lumen deformations and macrovoids. In the current work, PVDF HFMs were prepared bymanipulating air gap intervals at 5, 10, 15, 20, and 25 cm, using dry-wet spinning mechanism. The changes in its properties,including contact angle, mechanical strength, and most importantly the morphological structure that is usuallycrucial for gas separation performance have been determined. The morphology was evaluated using SEM, and theinner lumen defects of HFMs were reduced with the increment of air gap interval during the spinning process. Subsequently,the CO2 gas permeance was observed to increase from 5 to 15 cm air gap distance and almost constant at20 cm air gap interval, then increase tremendously beyond this point. Furthermore, CO2/CH4 ideal selectivity wasobserved to be improved and reached the highest end at PVDF-AG15 and dropped beyond this point. Therefore, varyingair gap distance is considered as a practical approach for better gas separation. However, macrovoids will form ifthe air gap length is overlong. Thus, optimum air gap length during PVDF HFMs spinning is vital for morphology andgas separation performance.
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Chen Jian Jie,Oh Pei Ching,Saleh Syafiqa Bt M. 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.3
This review paper delineates an overview of recent developments on photocatalytic processes for the photoreduction of CO 2 into C1 solar fuels including methanol and methane. The effi ciency of the novel processes reported is compared in terms of the yields of C1 fuels. Brief introduction on synthetic protocols of the cited photocatalysts employed for the photoreduction of CO 2 into C1 fuels is succinctly discoursed in this work. Furthermore, an additional review section is also included for summarizing the recently published ideas of diff erent confi gurations of photocatalytic membrane processes utilized for the separation of CO 2 converted C1 products from the reaction solvent. It was concluded that there is still substantial room of improvement for both newly developed photocatalytic systems and membrane processes in terms of C1 yield and the fuel separation effi ciency, respectively. Despite its potential as a promising green candidate used for carbon capture and utilization, additional studies are still necessary prior to its scalable application in industry. These studies should take a deep dive into the optimization of both photocatalytic and membrane separation processes, largely by development of novel photocatalytic systems that are highly effi cient in CO 2 conversion and membrane systems that are selective toward desired fuel products.
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