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Seyyed Abbas Mousavi,Foad Jahangiri,Fathollah Farhadi,Vahid Vatanpour,Behnam Sabzi,Zeinab Chenari 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
CO2-laser irradiation was used to modify the surface properties of thin-film composite (TFC) polyamide reverse osmosis (RO) membranes. These membranes were first synthesized via interfacial polymerization of m-phenylenediamine (MPD) monomers and trimesoyl chloride (TMC) over porous polysulfone ultrafiltration support, followed by a CO2-irradiation. AFM, ATR-FTIR, SEM and contact angle measurements were used to characterize the surface properties of these membranes. The ATR-FTIR results indicated that CO2-laser irradiation did not induce any functional groups on the membrane surface. However, it was found that the laser irradiation enhanced the NaCl salt rejection and slightly reduced the permeate flux. Moreover, the maintenance of the flux in modified membranes was much higher than untreated ones. Specially, after 180 min of filtration, the reduction in initial flux for the unmodified membranes was 22%. However, the reduction in initial flux for the modified membranes was less than 5%. Bovine serum albumin (BSA) filtration revealed an improvement in the antifouling properties of the modified membranes. The changes in the membrane surface morphology showed that the roughness of membrane surface is reduced significantly.
Seyyed Mostafa Mirkhalili,Seyyed Abbas Mousavi,Ahmad Ramazani Saadat Abadi,Masoud Sadeghi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.12
Mesh-reinforced cellulose acetate (CA)-based membranes were prepared for forward osmosis (FO) by immersion precipitation. Casting compositions such as CA percent and 1, 4-dioxane/acetone ratio and also preparation conditions such as evaporation time, coagulation bath and annealing temperatures were tested for membranes’ performance. The results were compared with commercially CTA membranes. The best membrane (17.9% polymer and 1, 4-dioxane/acetone ratio of 1.89) showed water flux of 9.3 L/m2h (LMH) and RSF of 0.536mol NaCl/m2h. Moreover, the membrane structure was reinforced by a polyester mesh, which created micro pores in the back of the membrane. This caused higher water flux and RSF compared to membranes without mesh. FO membrane prepared under best conditions, had a smoother surface than commercial ones. This feature enhances the fouling properties of the membrane, which can be appropriate for wastewater treatment applications.
Niloofar Nasirpour,Seyyed Mohammad Mousavi,Seyed Abbas Shojaosadati 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
We investigated a novel wastewater treatment method for the remediation of crude oil refinery effluents with large number of recalcitrant organic compounds. The treatment system consists of an up-flow anaerobic sludge blanket (UASB) reactor and an aerobic packed-bed biofilm reactor (PBBR) in combinatory pattern to increase the efficiency of treatment and to remove polycyclic aromatic hydrocarbons (PAHs) of the wastewater. The mean chemical oxygen demand (COD) removal efficiency in the UASB reactor and PBBR over 118 days of sampling was 68.48% and 38.28%, respectively. The total COD removal efficiency of the system was 81.07%. The GC-MS abundance and area values for each of the substances in the effluent decreased greatly from the corresponding value in the influent. Specifically, the PAHs were totally removed during the treatment process. This study presents a feasible technology for the treatment of refinery effluents.
Bahman Ebrahimi,Seyed Abbas Shojaosadati,Seyyed Mohammad Mousavi 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.3
A flow-through system based on acetylcholineesterase (AChE) was studied. The system was prepared by mixing AChE and a multiwall carbon nanotube (MWCNT). Two important parameters, the ratios of AChE:MWCNT (X1) and AChE-MWCNT:sol-gel (X2)were optimized using response surface methodology. The results revealed that an enzyme immobilized within the MWCNT-sol-gel was more effective compared to one conducted with sol-gel. The optimum feed flow rate was 0.4 mL/min and ATChI concentration was found to be 1 mM. The optimum ratios of X1 and X2 for immobilization on ceramic packing were 1.07 and 0.43, respectively. The sensitivity of this flow-through system was 1.82 × 10−5/μM and long-term stability analyzed after 120 days was 74% of initial absorbance. With respect to an incubation time of 14 min, the detection limit for paraoxon was 7.3 × 10−12 mol.
Hesamoddin Rabiee,Mohammad Soltanieh,Shadi Meshkat Alsadat,Seyyed Abbas Mousavi,Ali Ghadimi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Zeolite SAPO-34 was used for fabrication of mixed matrix membranes (MMMs) to improve the CO2/CH4/N2 gas separation performance of the neat Pebax1074 membrane. Permeability and selectivity of theMMMs were studied at different temperatures of 25–65 8C and pressures of 4–24 bars. Also sorption ofdifferent gases in MMMs was measured at 35 8C and different pressures, which showed enhancedsolubility coefficients. Moreover, thermal, morphological and mechanical properties of MMMs werecharacterized by differential scanning calorimetry (DSC), scanning electron microscope (SEM) andtensile analysis. The results showed excellent improvement in CO2/CH4 selectivity (about 70%) andCO2/N2 selectivity (about 15%) at 20 wt% SAPO-34 loading