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Organic-inorganic hybrid membrane in which nanoscale hybrid domains creating preferential pathways for selective permeation exhibits excellent performance in separation processes. Herein, a synthesis route of sol-gel reaction in acidified and hydrated ethanol to prepare silica-poly (vinyl alcohol) hybrid membrane of nanoscale homogeneity is reported. 29 Si NMR study was performed on the membrane samples to probe the connectivity of SiO4 tetrahedra in the cross-linking hybrid networks while the small-angle scattering study revealed nanostructure of the silica-polymer hybrid. TEM, DSC, IR, TGA, XRD and swelling studies were performed to study other physico-chemical properties of the membrane. The hybrid membrane exhibited superior water permeability 96 L m -2 h -1 µm than the other reported membranes in pervaporation desalination of saline water of 2000 ppm NaCl.

Pervaporation membrane technology is commercially successful in the dehydration of organic solvents, and the technology has potential for seawater desalination with high recovery because of its capability to treat highly saline water. But to make the technology advantageous over the other available membrane desalination technologies in terms of productivity flux without additional energy cost, the selective barrier layer is required to be extremely thin, defect‐free, hydrophilic, and selective to water. In this work, we prepared an efficient membrane by reinforcing a highly water‐permeable but continuous barrier layer of poly(vinyl alcohol)–silica (PVA‐SiO2) hybrid material on porous polysulfone hollow fibers. The PVA‐SiO2 in acidified and hydrated ethanol was aged at room temperature for a period to allow solvent evaporation to obtain the solution concentration desired for the reinforcement. The reinforced hollow fiber membrane with optimal PVA‐SiO2 barrier layer thickness exhibited a performance with a flux of 20.6 L m−2 h−1 and 99.9% salt rejection from a saline feed of 2000 ppm NaCl at 333 K. The effects of PVA‐SiO2, temperature, and feed salinity on the pervaporation performance of the membrane were also studied. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45718.

A facile one-step dip-coating method is reported here to prepare recyclable superhydrophobic polypropylene membrane. The membranes with nanoscale surface roughness and contact angle (water) greater than 150° were created by dipping polypropylene fabric film in solution of silica nanoparticles networked with alkylsiloxanes and they exhibited excellent oil flux for oil-water separation under gravity-induced simple separation system. Taking into consideration of its separation selectivity, productivity flux, reusability and endurance, the membrane shows promising in treatment of oily wastewater and oil spill cleanup.

Some of the best entities for the removal of volatile organic pollutants from water, poly(dimethyl siloxane) (PDMS) membranes from two types of initial PDMS precursors, were thoroughly investigated. In both the cases, the sizes of the initial macromonomers increased because of the crosslinking in the liquid state, and they exhibited Gaussian chain statistics, which were condensed by further crosslinking to the formation of the membranes. The structures of both the membrane types exhibited large interchain spacing on swelling; this implied a high degree of chain mobility. Their structural properties were corroborated by their separation performances. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41461.

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