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- 저자 : Woei Jye Lau (검색결과 8 건)
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Woei Jye Lau,Gwo-Sung Lai,Jian-xin Li,Stephen Gray,Yunxia Hu,Nurasyikin Misdan,PEI SEAN GOH,Takeshi Matsuura,Ihsan Wan Azelee,Ahmad Fauzi Ismail 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Polyamide thinfilm composite (TFC) membranes are state-of-the-art membranes with superiorpermeability and selectivity, and are widely used in various membrane-based processes for desalination,wastewater treatment and other separation applications. Over the past 15 years, there has been growinginterest among membrane scientists to study the role of the polymeric substrates and perform in-depthanalyses on how changes in the substrate physicochemical properties could affect polyamide layer structureand thus membrane performance. Recent advancements in new polymeric materials development andnanomaterial synthesis have led to opportunities for new generation substrate development. Consideringthe importance of TFC membranes for industrial separation process, this review will give a state-of-the-artaccount of the subject matter by emphasizing substrates made by different techniques and variousmaterials. More specifically, the article will review the roles of the developed substrates on thephysiochemical properties of polyamide selective layer and further their influences on TFC membraneperformance for both pressure-driven (nanofiltration/reverse osmosis) and osmotically-driven (forwardosmosis/pressure retarded osmosis) processes, aiming to stimulate progress in thefield. A framework forbetter understanding the substrate development to fulfill the industrial requirements of TFC membraneapplication will also be presented in this review before ending with future perspectives.
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Nurasyikin Misdan,Woei Jye Lau,Chi Siang Ong,Ahmad Fauzi Ismail,Takeshi Matsuura 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
Three composite nanofiltration (NF) membranes made of different substrate materials--polysulfone (PSf),polyethersulfone (PES) and polyetherimide (PEI)--were successfully prepared by interfacial polymerization technique. Prior to filtration tests, the composite NF membranes were characterized using field emission scanning electron microscope(FESEM), atomic force microscope (AFM) and X-ray photoelectron spectroscope (XPS). It was observed that thesurface properties of composite NF membranes were obviously altered with the use of different substrate materials. Theseparation performance of the prepared composite NF membranes was further evaluated by varying operating conditions,which included feed salt concentration and operating temperature. Experimental results showed that the waterflux of all TFC membranes tended to decrease with increasing Na2SO4 concentration in feed solution, due to the increasein feed osmotic pressure. Of the three TFC membranes studied, PSf-based membrane demonstrated the highestsalt rejection but lowest water flux owing to its highest degree of polyamide cross-linking as shown in XPS data. Withrespect to thermal stability, PEI-based TFC membrane outperformed the rest, overcoming the trade-off effect betweenpermeability and rejection when the feed solution temperature was gradually increased from 30 oC to 80 oC. In addition,the relatively smoother surface of hydrophilic PEI-based membrane when compared with PSf-based membranewas found to be less susceptible to BSA foulants, leading to lower flux decline. This is because smoother surface ofpolyamide layer would have minimum “valley clogging,” which improves membrane anti-fouling resistance.
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Surface modification of PA layer of TFC membranes: Does it effective for performance Improvement?
Ying Siew Khoo,Woei Jye Lau,Yong Yeow Liang,Norhaniza Yusof,Ahmad Fauzi Ismail 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-
Separation process based on polyamide (PA) thin film composite (TFC) membrane is the dominant desalinationtechnology in the 21st century to produce potable water to meet the growing global freshwaterdemand. Despite offering good filtration performance and exhibiting stable chemical and mechanicalproperties, TFC membrane still encounters other technical challenges such as surface fouling andtrade-off feature between water permeability and solute selectivity which prompt continuous researchefforts. There has been growing interest in recent years among researchers to alter the surface propertiesof PA layer via various modification methods to overcome the drawbacks of typical selective layer. Butthe question that remains to be answered – Does the modified PA layer effective for performanceimprovement? It is the aim of this article to provide a comprehensive review on the modification techniques(i.e., surface coating, surface grafting, plasma treatment and layer-by-layer assembly) and themodifying materials (both organic and inorganic materials) that have been commonly employed to establisha functionalized layer atop PA layer to improve its characteristics for desalination process. We hopethis review that covers the relevant articles published over the past 10 years could provide insights toscientists in modifying selective layer of TFC membranes for better performance in water treatmentprocesses.
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Nur Aimie Abdullah Sani,Woei Jye Lau,Ahmad Fauzi Ismail 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The performance of polyphenylsulfone (PPSU) solvent resistant nanofiltration (SRNF)-based flat sheetmembranes prepared from phase inversion method was investigated by varying the concentration of polymer in thedope solution and condition of membrane pretreatment process. The membrane properties were characterized by SEM,FTIR, AFM and contact angle goniometer, while their performance was evaluated by measuring methanol flux andrejection of different molecular weight of dyes (ranging from 269 to 1,470 g/mol) in methanol. The experimental resultsshowed that the polymer concentration has great impact not only on the final membrane morphology but also its separationcharacteristics. Increasing polymer concentration from 17 to 25wt% tended to suppress finger-like structure andmore pear-like pores were developed, causing methanol flux to decrease. This can be explained by the decrease inmolecular weight cut off (MWCO) of the membrane prepared at high polymer concentration. With respect to theeffect of membrane pretreatment conditions, the rejection of membrane was negatively affected with longer immersionperiod in methanol solution prior to filtration experiment. The variation in membrane rejection can be attributed tothe rearrangement of the polymer chain, which results in membrane swelling and/or change of membrane surfacehydrophilicity.
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Noor Aina Mohd Nazri,Woei Jye Lau,Ahmad Fauzi Ismail 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9
The effect of polyacrylonitrile-g-poly (vinyl alcohol) (PAN-g-PVA) copolymer additive on the properties of PAN-based hollow fiber UF membranes was studied. The resulting hollow fiber membranes were characterized with respect to structural morphology, surface properties, and proteins rejection in order to investigate the impact of PAN-g- PVA copolymer composition (presented at different PAN: PAN-g-PVA ratio) in the UF membrane on the separation and antifouling properties. Results showed that the hollow fiber membrane prepared from the highest composition of PAN-g-PVA copolymer (PAN: PAN-g-PVA 80 : 20) was able to produce pure water flux as high as 297 L/m2·hr in comparison to 41 L/m2·hr reported in control PAN membrane when tested at 1 bar. Fouling experiments performed using bovine serum albumin (BSA), albumin from chicken egg (CE) and trypsin indicated that the blend membranes with higher surface coverage of hydrophilic PVA (34-60%) were more excellent in minimizing protein fouling, which might be correlated with the formation of hydrophilic PVA layer on their surface. Although increase in membrane hydrophilicity upon PAN-g-PVA copolymer incorporation might be the main reason contributing to improved membrane antifouling properties, the changes in membrane surface roughness and pore size could not be completely ruled out to influence membrane anti-fouling resistance during protein filtration.
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Mimi Suliza Muhamad,Mohamad Razman Salim,Woei Jye Lau 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
Polyethersulfone (PES) is a commonly used polymeric material for the fabrication of ultrafiltration (UF) membranes. However, the hydrophobic nature of PES leads to poor membrane performance with low anti-fouling properties during filtration process. Hence, for this study, the PES-based hollow fiber membrane was modified with inorganic silicon dioxide (SiO2) nanoparticles of various loading (from zero to 4 wt%), aiming to improve the membrane properties for advanced water treatment process. The characterization of the surface morphology, physical and chemical properties of novel PES/SiO2 composite membranes was performed by SEM, FTIR-ATR, TGA and contact angle analyzer. The SEM images show the changes in membrane structure as well as skin layer thickness upon addition of SiO2 nanoparticles. The FTIR-ATR analysis shows the functional group of SiO2 in the polymer matrices. Results further show that the presence of 2 wt% SiO2 in the membrane matrix is the best loading to improve the water flux and bovine serum albumin (BSA) rejection, achieving 87.2 L/m2·h and 94%, respectively. As a comparison, the control PES membrane only exhibits water flux of 44.2 L/m2·h and rejection of 81%. Results also show that the flux recovery percentage of the membrane was improved from 82% in the control membrane to 93% in the membrane incorporated with 2 wt% SiO2, indicating improved membrane anti-fouling property. Furthermore, the PES/SiO2 membrane shows huge potential for advanced water treatment, as the qualities of the permeate samples treated by this membrane could meet the limit set by a local water company.
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Fatemeh Momtazan,Azam Vafaei,Mehrorang Ghaedi,Abdol Mohammad Ghaedi,Daryoush Emadzadeh,Woei Jye Lau,Mohammad Mehdi Baneshi 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
Copper sulfide nanoparticles were synthesized and loaded on activated carbon (CuS-NPs-AC) for ternary dye removal. Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX) were used to characterize the synthesized materials. The performance of the materials was subsequently evaluated for simultaneous ultrasound assisted adsorption of Disulphine Blue (DB), Eosin Yellow (EY) and Safranin O (SO) dyes in ternary solution under different conditions that include variation in solution pH, initial concentrations of dyes, sonication time and adsorbent dosage. Response surface methodology (RSM) using central composite design (CCD) was employed to obtain the optimum experimental conditions. The maximum removal efficacies (88.39%, 68.49% and 55.69% for DB, EY and SO, respectively) were found at the optimum conditions: 3.63 min of sonication time, 0.02 g of CuS-NPs-AC, 7.76mg L1 of DB, 8.89mg L1 of EY, 9.87mg L1 of SO and pH 6.5. Very high adsorbent capacities of 198.12, 165.0, 139.58mg g1 for DB, EY and SO, respectively, were yielded from Langmuir isotherm as best fitted model. Kinetic study indicated that the pseudo-second-order kinetic model was well fitted to the experimental data of ternary adsorption process. The results of the study display very good adsorption efficiency of the synthesized adsorbent for dye removal with high adsorption capacity under optimum conditions.
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