Preparation of mixed matrix PES-based nanofiltration membrane filled with PANI-co-MWCNT composite nanoparticles

Abdolreza Moghadassi,Ehsan Bagheripour,Sayed Mohsen Hosseini 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4

Mixed matrix polyethersulfone/PANI-co-MWCNTs composite nanoparticle nanofiltration membrane was prepared by casting solution technique. Polyvinylpyrrolidone was also used as membrane pore former in membrane fabrication. The effect of polyaniline-co-multi walled carbon nanotubes composite nanoparticle concentration in the casting solution on membrane structure and performance was investigated. Scanning optical microscopy and scanning electron microscopy, FTIR analysis, porosity, mean pore size, contact angle, water content, NaCl/Na2SO4 rejection, water flux, tensile strength measurements and 3D surface image were also carried out in membrane characterization. SOM images showed nanoparticle agglomeration at high additive loading ratio. SEM images showed the membrane sub-layer porosity and thickness were changed by use of nanoparticles in membrane matrix. The membrane water content, porosity and pore size were increased by increase of nanoparticle concentration, except for 1%wt. Use of PANI-co- MWCNT nanoparticles in the membrane matrix caused a decrease of membrane contact angle from 63.43 to 46.76o. Salt rejection and water flux were improved initially by increase of nanoparticle concentration up to 0.1%wt and then decreased by more additive concentration. In addition, the membranes tensile strength was reduced by increase of PANI-co-MWCNTs composite nanoparticle concentration. 3D surface images showed a smoother surface for mixed matrix membrane filled with 0.1wt% PANI-co-MWCNTs. Modified membrane containing 0.1wt% composite nanoparticles showed better performance compared to others.

Fabrication of poly(ether sulfone) based mixed matrix membranes modified by TiO2 nanoparticles for purification of biodiesel produced from waste cooking oils

Farah Sadat Halek,Sayed Mohsen Hosseini,Samaneh Koudzari Farahani 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2

Biodiesel produced from waste cooking oils was purified by use of polyethersulfone-co-TiO2 nanocomposite membranes. The membranes were prepared by solution casting technique through phase inversion method. Titanium dioxide nanoparticles were used as inorganic filler additive in membrane fabricating. The effect of nanoparticle concentration in the casting solution on the physico-chemical characteristics, morphology and performance of prepared membranes was studied. SEM, AFM and XRD analyses were carried out for the characterization of membrane. The results showed uniform nanoparticle distribution in the membranes matrix. XRD results also indicated a crystalline structure for the membranes. Membrane surface roughness was decreased sharply by increase of nanoparticle concentration up to 0.05%wt in membrane matrix and then increased slightly. Membrane flux, rejection, water content, porosity and membrane mechanical strength were enhanced initially by increase of nanoparticles concentration up to 0.05%wt and then decreased by more increase of nanoparticles content ratio. The nanocomposite membrane containing 0.05 wt% TiO2 showed more appropriate performance compared to others.

Physico-chemical characterization, morphology and performance of polyethersulfone based membrane for glycerol removal from biodiesel produced through trans-esterification of waste cooking oils

Samaneh Koudzari Farahani,Farah Sadat Halek,Sayed Mohsen Hosseini 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10

In the current research, the biodiesel purification was by use of poly ether sulfone based membrane. The biodiesel was produced from waste cooking oils by trans-esterification. Membranes were fabricated by solution casting through phase inversion method. The effect of PES concentration in the casting solution on physico-chemical characteristics, morphology and performance of membranes in glycerol removal from produced biodiesel was studied. SEM and AFM analysis have been utilized for the membrane morphological characterization. SEM images showed uniform surface for the membranes. AFM analysis revealed that the membrane surface roughness was decreased by increase of polymer concentration. The membrane flux, water content and porosity were also decreased by increase of PES concentration. Moreover, obtained results showed that membrane glycerol rejection and mechanical strength were improved by increase of polymer binder concentration. The prepared membrane with 16%wt PES showed more appropriate performance compared to others.

Preparation and electrochemical characterization of polyvinylchloride/ FeTiO3-co-Fe3O4 nanoparticles mixed matrix ion exchange membranes: Investigation of concentration and pH effects

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.

Surface modification of heterogeneous cation exchange membrane through simultaneous using polymerization of PAA and multi walled carbon nano tubes

A.R. Moghadassi,P. Koranian,S.M. Hosseini,M. Askari,S.S. Madaeni 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Polyvinylchloride based heterogeneous cation exchange membrane was modified by using in situ polymerization of polyacrylic acid and multi walled carbon nano tubes simultaneously. Spectra analysis confirmed graft polymerization decisively. SEM images illustrated that grafted-PAA/MWCNTs filled the cracks in membrane by simple gel network entanglement. Ion exchange capacity was improved by PAA/MWCNTs grafting in modified membranes. Membrane water content was decreased by PAA grafting and then showed increasing trend by using MWCNTs in modifier solution up to 0.1%wt. Water content was decreased again by more MWCNTs loading ratio. Grafted-PAA membranes showed lower membrane potential, transport number, selectivity and flux compared to pristine membrane in sodium chloride ionic solution. These parameters were decreased more by using MWCNTs up to 0.1%wt in modifier solution and then showed increasing trend by more MWCNTs concentration from 0.1 to 0.3%wt. All mentioned parameters were declined again by more increase in MWCNTs content from 0.3 to 1.0%wt. Results exhibited lower membrane selectivity for the modified membranes compared to pristine ones in bivalent ionic solution. The grafted-PAA/MWCNTs modified membranes also showed lower electrical resistance compared to unmodified ones. Obtained results showed different behavior for permeability in bivalent ionic solution compared to monovalent type.

Preparation and characterization of nanocomposite heterogeneous cation exchange membranes modified by silver nanoparticles

Maryam Zarrinkhameh,Akbar Zendehnam,Sayed Mohsen Hosseini 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.7

We prepared polyvinylchloride based nanocomposite heterogeneous cation exchange membranes by solutioncasting technique using cation exchange resin powder as functional groups agent and tetrahydrofuran as solvent. Silvernanoparticles were also used as fillers in membrane fabrication. The effect of silver nanoparticles concentration in castingsolution on membrane physico/chemical and antibacterial characteristics was studied. The SEM images showed compactstructure for the modified membranes. X-ray diffraction results also revealed that membrane crystallinity was clearlychanged by increase of nanoparticle concentration. Membrane selectivity and transport number were enhanced initiallyby increase in nanoparticle content up to 4%wt in prepared membrane, and then showed decreasing trend by more increasein additive concentration from 4 to 8%wt. Selectivity and transport number were enhanced another time by furtherincrease in nanoparticle loading ratio from 8 to 16%wt. Opposite trend was found for the membranes’ average grainsize by variation in additive content. Ionic flux was also clearly enhanced by using Ag nanoparticles in membrane matrix. Moreover, modified membranes showed good ability in decrease of Escherichia coli growth rate.