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Maryam Homayoonfal,Mohammad Reza Mehrnia,Samane Rahmani,Yasaman Mohades Mojtahedi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this study, polysulfone/alumina nanocomposite membranes were synthesized with the principal aimof reducing biofouling in membrane bioreactors. The filtration experiments indicate that aluminananoparticles can increase water flux by enhancing membrane hydrophilicity while maintaining theseparation efficiency through decreasing porosity. Altogether, as confirmed by AFM images, thedevelopment of roughness results in biofilm formation reduction on the membrane surface layer. Onthe whole, presence of alumina nanoparticles up to the polymer concentration of 0.03 wt.% will result inan augment in separation yield up to 7%, four times higher water flux, and 83% reduction in membranefouling.
Ahmad Akbari,Maryam Homayoonfal 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.8
The aim of this research is synthesis of high performance loose nanofiltration membranes for separation of direct dyes from textile wastewater. This involved sulfonation of polysulfone with the aim of increasing hydrophilicity and permeability; synthesis of a sulfonated polysulfone and polysulfone (SPSf/PSf) blended membrane for developing the mechanical resistance and stability of the filtration behavior; and synthesis of TiO2/SPSf/PSf nanocomposite membrane for magnifying selectivity. FTIR analysis confirmed the sulfonated groups and the TiO2 nanoparticles presence. AFM and SEM analysis proved the highest surface roughness and the smallest pore size of TiO2/SPSf/PSf nanocomposite membrane, respectively. The results of water absorption test revealed that the highest level of hydrophilicity belonged to the SPSf/PSf followed by TiO2/SPSf/PSf membrane. The nanofiltration tests showed that the SPSf/PSf membranes enjoy the highest permeability, while the TiO2/SPSf/PSf nanocomposite not only had an acceptable permeability but also presented the highest dye separation efficiency.
Mohammad Reza Mehrnia,Shima Javdaneh,Maryam Homayoonfal 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
The aim of this research was to synthesize a polysulfone/Zinc oxide nanocomposite membrane (PSf/ZnO NCM) in order to mitigate membrane fouling. ZnO nanoparticles with an approximate size of 20 nm were blended with PSf matrix. To fabricate an efficient PSf/ZnO NCM, polyethylene glycol and polyvinyl pyrrolidone were used as pore former agent, based on which PEG-NCMs and PVP-NCMs were fabricated. The effect of the type of pore former and concentration of nanoparticles was evaluated on the structure and performance of nanocomposite membrane. According to SEM images, with the increase in the concentration of nanoparticles, membrane porosity grew as well. AFM analysis confirmed increased roughness with contact angle measurement showing enhanced hydrophilicity. The filtration performance implied that the presence of ZnO nanoparticles improves water flux. Moreover, ZnO nanoparticles elevated humic acid rejection up to 99.7% and 94.2% and decreased total filtration resistance up to 89% and 30% for PEG-NCMs and PVP-NCMs, respectively.