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RISS 인기검색어
- 검색키워드
- 저자 : Sayed Siavash Madaeni (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Sayed Siavash Madaeni,Masoud Rahimi,Mahdiah Abolhasani 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
The accumulation of deposited layer on membrane surface in cross-flow microfiltration was investigated. This study provides a basis for elucidation of the membrane segments with superior tendency for cake deposition due to fouling. A commercially available GVWP membrane was fouled with a colored (blue indigo suspension in water) feed. The deposition pattern or fouling tendency was obtained using a digital camera, scanning electron microscope (SEM)and image analysis. The effects of feed concentration, transmembrane pressure and cross-flow velocity on cake deposition were investigated. In the early stages of the filtration trials, cake deposition was increased from the commencement portion (feed inlet) towards the furthermost part (concentrate outlet) of the membrane surface. However, at the completion of filtration, no pronounced difference was realized between cake deposition in the median and end parts of the membrane. Computational fluid dynamics (CFD) modeling of the membrane was carried out to predict the fouling behavior in various segments of the membrane at different operating conditions. The results of CFD modeling are in acceptable agreement with the experimental data. Accomplishment of the membrane sections with higher tendency for accumulation of foulants may provide a basis for manipulation of conditions to diminish the buildup of fouling deposition in the proposed segments. This results in lower cake deposition on vital parts to minimize the overall fouling.
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Sayed Mohsen Hosseini,Alireza Hamidi,Abdolreza Moghadassi,Sayed Siavash Madaeni 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3
Mixed matrix heterogeneous cation exchange membranes were prepared by solution casting technique. Ilmenite-co-iron oxide nanoparticle was also employed as inorganic filler additive in membrane fabrication. The effectof the used additives on membrane electrochemical properties was studied. Membrane ion exchange capacity, membranepotential, transport number and selectivity all were improved by use of FeTiO3/Fe3O4 nanoparticles in membranematrix. Utilizing FeTiO3-co-Fe3O4 nanoparticles in the casting solution also led to increase in ionic flux obviously. The modified membranes containing FeTiO3-co-Fe3O4 nanoparticles showed higher transport number, selectivity andionic flux compared to modified membrane containing ilmenite. Electrodialysis experiment in laboratory scale alsoshowed higher cation removal for modified membrane containing FeTiO3-co-Fe3O4 nanoparticles compared to othermodified membranes and pristine ones. Results showed that membrane areal electrical resistance declined sharply byuse of FeTiO3-co-Fe3O4 nanoparticles in membrane matrix. Moreover, modified membrane containing ilmenite showedlower electrical resistance compared to others. Results showed that oxidative stability of membranes was decreasedslightly by use of FeTiO3/Fe3O4 nanoparticles in membrane matrix. The results revealed that modified membranes inthis study are comparable with that of other commercial ones.
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Sayed Mohsen Hosseini,Alireza Hamidi,Abdolreza Moghadassi,Fahime Parvizian,Sayed Siavash Madaeni 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.9
Polyvinyl chloride based/FeTiO3-co-Fe3O4 nanoparticles mixed matrix heterogeneous cation exchange membranes were prepared by solution casting technique. The effect of using filler additives in casting solution and also electrolyte concentration and pH on electrochemical properties of membrane was studied. Membrane potential, transport number and selectivity were improved by using FeTiO3/Fe3O4 nanoparticles in membrane matrix. Utilizing FeTiO3/ Fe3O4 nanoparticles in membrane matrix also led to improvement of membrane ionic flux from 2.95*10−5 to 4.15*10−5 (mol/m2·s) obviously. Similar trend was also found for membrane electrical conductivity. Moreover, the transport number, selectivity and membrane electrical conductivity were enhanced by increase of electrolyte concentration. Prepared membranes exhibited higher transport number/selectivity at pH 7 compared to other pH values. Obtained results showed that the membrane electrical resistance decreased initially by increase of electrolyte pH sharply and then began to increase. Membranes exhibited lower selectivity for bivalent ions compared to monovalent type. Modified membranes containing FeTiO3/Fe3O4 nanoparticles showed more appropriate electrochemical properties compared to other prepared membranes.
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Sayed Mohsen Hosseini,Mahsa Nemati,Ehsan Bagheripour,Sayed Siavash Madaeni 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
Surface modification of polyvinylchloride based heterogeneous cation exchange membrane was performed by graft polymerization of PAA and PAA-co-PANI/MWCNTs nanoparticles. The ion exchange membranes were prepared by solution casting technique. Spectra analysis confirmed graft polymerization clearly. SEM images illustrated that graft polymerization covers the membranes by simple gel network entanglement. The membrane water content was decreased by graft polymerization of PAA-co-PANI/MWCNTs nanoparticles on membrane surface. Membrane transport number and selectivity declined initially by PAA graft polymerization and then began to increase by utilizing of composite nanoparticles in modifier solution. The sodium and barium flux was improved sharply by PAA and PAAco- 0.01%wt PANI/MWCNTs graft polymerization on membrane surface and then decreased again by more increase of PANI/MWCNTs nanoparticles content ratio in modifier solution. The electrodialysis experiment results in laboratory scale showed higher dialytic rate in heavy metals removal for grafted-PAA and grafted-PAA-co-PANI/MWCNTs modified membrane compared to pristine one. Membrane areal electrical resistance was also decreased by introducing graft polymerization of PAA and PAA-co-PANI/MWCNTs NPs on membrane surface.
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Akbar Zendehnam,Mina Arabzadegan,Sayed Mohsen Hosseini,Nasrin Robatmili,Sayed Siavash Madaeni 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.6
Polyvinylchloride-blend-styrene butadiene rubber based nanocomposite cation exchange membranes were prepared by solution casting technique. Iron-oxide nanoparticles and Ag-nanolayer were simultaneously utilized as filler and surface modifier in membrane fabrication. The effects of Ag-nanolayer film thickness on membrane physicochemical and antibacterial characteristics of nanocomposite PVC-blend-SBR/Iron-oxide nanoparticles were studied. SEM images showed membrane roughness decreasing by Ag nanolayer thickness increasing. Membrane charge density and selectivity declined by Ag nanolayer coating up to 5 nm in membranes and then showed increasing trend by more nanolayer thickness. Ionic flux also showed increasing trend. Membranes showed good ability in E-Coli removal. 20 nm Ag-nanolayer coated membrane showed better performance compared to others.
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