Development of novel membranes for PV separation of water–isopropanol mixtures using poly(vinyl alcohol) and gelatin

Sajjan, Ashok M.

doi:10.1016/j.memsci.2013.03.016

Cited by 27 publications

(16 citation statements)

References 33 publications

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“…This was further reveals from the Figure , in which flux and selectivity were plotted as a function of silver content in the membranes at 10 mass% of water in the feed. Because of crosslinking or incorporation of fillers into the membrane matrix packing density of the membranes increases, as a result the permeation flux decreases and selectivity increases . However, in the present study both permeation flux and selectivity were increased with increasing Ag‐NPs in the membrane.…”

Section: Resultscontrasting

confidence: 57%

“…Degree of crystallinity of the crosslinked PVA and its composite membranes was studied by WAXD and the resulting diffraction profiles are given in Figure . The diffraction pattern of crosslinked PVA shows a typical peak at around 2θ = 20°, indicating that the crosslinked PVA contains both crystalline and amorphous domains in the matrix . However, the intensity of this typical peak was correspondingly decreased with increasing the Ag‐Nps (M‐1 to M‐4).…”

Section: Resultsmentioning

confidence: 99%

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Enhancement of pervaporation performance of composite membranes through in situ generation of silver nanoparticles in poly(vinyl alcohol) matrix

Premakshi

Sajjan

Kittur

2014

J of Applied Polymer Sci

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Composite membranes were prepared from an aqueous solution of poly(vinyl alcohol) (PVA) and silver sulphate. The silver nanoparticles were generated in situ before crosslinking PVA matrix by reduction of silver ions using sodium borohydride. Physico-chemical properties of the resulting composite membranes were studied using Fourier transform infrared spectroscopy (FTIR), UV-vis spectroscopy (UV-vis), thermogravimetric analysis (TGA), Wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and universal testing machine (UTM). The UV-vis spectrum shows a single peak at 410 nm due to surface plasmon absorption of silver nanoparticles. This surely specified that silver nanoparticles are generated in PVA matrix. The membranes were under go pervaporation (PV) for separation of water from isopropanol at different temperatures. The results indicated that hydrophilicity and amorphous nature of the membranes were increased with increasing silver nanoparticles in PVA matrix. The swelling and separation performance of the membranes were studied. Both permeation flux and separation factor were increased with increasing silver nanoparticles in PVA matrix. The results showed that the membrane containing 2.5 mass% of Ag salt exhibited excellent PV performance. The values of total flux and flux of water are almost closed to each other, indicating that membranes could be effectively used to break the azeotropic point of water-isopropanol. The long-term test was performed at room temperature and ascertained that membranes were durable up to 30 days for the dehydration of IPA. On the basis of the estimate Arrhenius activation energy values, the efficiency of the membranes was discussed. The calculated DH s values are negative for all the membranes, indicating that Longmuir's mode of sorption is predominant.

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Section: Resultscontrasting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Enhancement of pervaporation performance of composite membranes through in situ generation of silver nanoparticles in poly(vinyl alcohol) matrix

Premakshi

Sajjan

Kittur

2014

J of Applied Polymer Sci

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“…For simplicity, it is assumed that the concentration profile along the diffusion length is linear. Thus, D i can be calculated with the following equation [49]:…”

Section: Diffusion Coefficientmentioning

confidence: 99%

Synthesis and characterization of GTMAC grafted chitosan membranes for the dehydration of low water content isopropanol by pervaporation

Sajjan

Premakshi

Kariduraganavar

2015

Journal of Industrial and Engineering Chemistry

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“…PVA has high chemical stability, mechanical strength, and is highly hydrophilic. The presence of numerous hydroxy groups facilitates the formation of hydrogen bonds with the amine and hydroxy groups of CS . PVA also has high adhesive properties, which enhance its use as a binder .…”

Section: Resultsmentioning

confidence: 99%

“…The presence of numerous hydroxy groups facilitates the formation of hydrogen bonds with the amine and hydroxy groups of CS. [23,24] PVAa lso has high adhesive properties, which enhancei ts use as ab inder. [25] Hydrophilic interactions provide better binding between the substrate and the thinfilm active layer.T iO 2 nanoparticles (NPs) were immersed in PSf to prepare ah ydrophilic substrate and to act as ap hotocatalyst.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Chitosan Thin Films on Mixed-Matrix Membranes for Complete Removal of Chromium

et al. 2015

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Herein we present a new approach for the complete removal of CrVI species, through reduction of CrVI to CrIII, followed by adsorption of CrIII. Reduction of chromium from water is an important challenge, as CrIV is one of the most toxic substances emitted from industrial processes. Chitosan (CS) thin films were developed on plain polysulfone (PSf) and PSf/TiO2 membrane substrates by a temperature-induced technique using polyvinyl alcohol as a binder. Structure property elucidation was carried out by X-ray diffraction, microscopy, spectroscopy, contact angle measurement, and water uptake studies. The increase in hydrophilicity followed the order: PSf < PSf/TiO2 < PSf/TiO2/CS membranes. Use of this thin-film composite membrane for chromium removal was investigated with regards to the effects of light and pH. The observations reveal 100 % reduction of CrVI to CrIII through electrons and protons donated from OH and NH2 groups of the CS layer; the reduced CrIII species are adsorbed onto the CS layer via complexation to give chromium-free water.

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Development of novel membranes for PV separation of water–isopropanol mixtures using poly(vinyl alcohol) and gelatin

Cited by 27 publications

References 33 publications

Enhancement of pervaporation performance of composite membranes through in situ generation of silver nanoparticles in poly(vinyl alcohol) matrix

Enhancement of pervaporation performance of composite membranes through in situ generation of silver nanoparticles in poly(vinyl alcohol) matrix

Synthesis and characterization of GTMAC grafted chitosan membranes for the dehydration of low water content isopropanol by pervaporation

Preparation and Characterization of Chitosan Thin Films on Mixed-Matrix Membranes for Complete Removal of Chromium

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