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Ruma Bhattacharyya,Samit Kumar Ray 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Several semi-interpenetrating network (Semi-IPN) hydrogels were synthesized by free radical copolymerization of acrylamide, hydroxyethyl methacrylate and N0N0-methylene bis acrylamide crosslinker (MBA) in presence of starch. These hydrogels were characterized by FTIR, DTA-TGA, XRD and SEM. The hydrogel showing the highest swelling% in water was used for removal of low (2.5–40 mg/L) and high (200–500 mg/L) concentration range of malachite green and methyl violet dyes from water. The hydrogel showed high adsorption for both of these dyes. Isotherms, kinetics, mass transfer coefficients and thermodynamics of dye adsorption were also studied.
Adsorption of industrial dyes by semi-IPN hydrogels of Acrylic copolymers and sodium alginate
Ruma Bhattacharyya,Samit Kumar Ray 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Several hydrogels were synthesized from sodium alginate and copolymer of acrylic acid and acrylamide. These hydrogels were characterized by FTIR, XRD, DTA-TGA, swelling and diffusion characteristics. Thehydrogel showing the best result for swelling was used for adsorption of Basic fuschin (BF) and Methylviolet (MV) dyes. The hydrogel showed high adsorption and removal% for these dyes for both low (2.5–25 mg/L) and high range (100–600 mg/L) of feed concentration. The dye adsorption data were fitted todifferent kinetics and adsorption isotherm models. The external mass transfer coefficient, diffusioncoefficient and thermodynamic parameters of dye adsorption were also determined.
Ruma Bhattacharyya,Samit Kumar Ray,Bidyadhar Mandal 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
A systematic method was employed to synthesize several hydrogels by crosslink copolymerization of acrylamide (AM), hydroxyl ethylmethacrylate (HEMA) and N,N’-methylenebisacrylamide (NMBA) at varied operating conditions. Composite hydrogels were also prepared by in situ incorporation of varied amounts of sodium aluminosilicate filler to the monomer mixtures at optimum operating conditions. These hydrogels were used for removal of rhodamine B and methyl violet dye from water at low (0.5–3 mg/L) and high concentration (50–500 mg/L) ranges. The composite hydrogels showed much higher dye adsorption than the unfilled hydrogels. Kinetic, adsorption and thermodynamic parameters for dye adsorption were also evaluated.
Paramita Das,Samit Kumar Ray 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
Plasticized polyvinyl chloride (PPVC) membranes were prepared by incorporating 20, 25 and 30 wt% ofdioctyl phthalate (DOP) plasticizer in the matrix of PVC. Filled PPVC membranes were prepared byincorporating 1, 2 and 3 wt% bentonite clay in the PPVC membrane containing 25 wt% of DOP. Themembranes were characterized by FTIR, DTA-TG, XRD, SEM and mechanical properties. Thesemembranes were used for sorption and pervaporation of 1–18 wt% tetrahydrofuran (THF) in water. Thepreferential sorption of the organophilic membranes were analyzed in terms of thermodynamicinteraction parameters. The permeability and the diffusion coefficient of the solvents were determined.
Choudhury Swastika,Samit Kumar Ray 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
Sodium montmorillonite (NaMMT) nanoclay particles were incorporated in-situ in the copolymer matrix of Poly (acrylonitrile-co-ethyl acrylate) during its synthesis from different molar% of acrylonitrile (AN) and ethyl acrylate (EA) monomers by emulsion polymerization. Similar polymerization was also carried out in the presence of iron salts to generate iron nanoparticles (FeNP) in situ in the membrane matrix. The membranes were characterized by FTIR, NMR, molecular weight (Mv), XRD, DTA-TGA, SEM, TEM, EDAX, contact angles for hydrophilicity and mechanical properties. The sorption and permeation of acetone-water binary mixtures through these membranes were analyzed in terms of solvent-solvent and solvent-membranes interaction and also by solvent coupling with Flory-Huggins, ENSIC and six-parameter solution diffusion model. The synthesis variables were optimized with the central composite design (CCD) of response surface methodology (RSM). The filled membranes showed high sorption and pervaporation selectivity for water for dehydration of acetone, while for similar filler loading FeNP-filled membranes showed higher flux and selectivity than NaMMT clay filled membrane. The membrane prepared with AN : EA molar ratio of 5 : 1 and filled with 2 wt% NaMMT clay showed a flux(kg/m2h)/selectivity of 0.903/125.2, which further increased to 0.937/140 for the same membrane filled with 5wt% FeNP for 90wt% feed acetone.
Recovery of pyridine from water by pervaporation using filled and crosslinked EPDM membranes
Nayan Ranjan Singha,Samit Kumar Ray,Paramita Das 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Organoselective membrane was prepared from ethylene propylene diene monomer (EPDM) rubber. Crosslinked EPDM rubber was filled with 2, 4 and 6 wt% N330 carbon black filler to produce three different filled membranes designated as EPDMCV2, EPDMCV4 and EPDMCV6, respectively. These filled rubber membranes were used for pervaporative recovery of low concentration of pyridine from water. These filled membranes were characterized by crosslink density, SEM, XRD and mechanical properties. Sorption thermodynamics were discussed. Partial permeability, intrinsic membrane selectivity and diffusion coefficients of solvents were also determined. The filled membranes showed much higher pyridine selectivity than most of the membranes reported for similar system.