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- 저자 : Cyrus Ghotbi (검색결과 2 건)
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Thin film graphene oxide membrane: Challenges and gas separation potential
Fateme Abbasi,Javad Karimi-Sabet,Cyrus Ghotbi,Zeinab Abbasi 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
Graphene oxide membranes were prepared by vacuum and pressurized ultrafiltration methods on the 12% modified Polyacrylonitrile (12mPAN) substrate to specify challenges, salient features, future directions, and potential of GO membrane for separation fields using characterization techniques and gas separation test (studied gases are CO2, He and N2), which is an efficient tool for better understanding of GO membrane behavior. GO membrane structure was examined over a wide range of parameters, such as pore size range of substrate and its surface properties, pH of GO dispersion, GO content, synthesis pressure, operating pressure and temperature. The results show that the GO content does not hold a linear relationship with the permeance and selectivity. Film thickness, aggregates, synthesis pressure defects and interlayer spacing have significant effects on the gas separation performance of GO membranes which originate from the synthesis method and its conditions.
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Mahnaz Mohebali Nejadian,Niyaz Mohammad Mahmoodi,Ghotbi Cyrus,Farhad Khorasheh 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10
A new magnetic composite was synthesized by integration of ZnFe2O4 and MIL-53(Fe) micro-rods by a solvothermal method. This composite served as a heterogeneous catalyst to overcome the high electron-hole recombination rates of ZnFe2O4 and to enhance the degradation of Direct Red 23 under visible light irradiation. Different analytical techniques, including XRD, FTIR, SEM, DRS, VSM, and PL, were employed to characterize the synthesized heterojunction nanocomposite and to evaluate its photocatalytic activity. The ZnFe2O4/MIL-53(Fe)/Vis-light system resulted in significantly higher dye degradation as compared with pristine ZnFe2O4 and MIL-53(Fe) semiconductors at the optimum pH of 3.1 and irradiation time of 120 minutes. Moreover, the composite exhibited high magnetization property that led to easy collection and recovery from effluent solution. It also retained its durability and stability after five cycles. The photo-generated hole was found to be the primary dye destruction agent as specified by the scavenger test.
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