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Chitosan Immobilized Porous Polyolefin As Sustainable and Efficient Antibacterial Membranes

Mural, Prasanna Kumar S and Kumar, Banothu and Madras, Giridhar and Bose, Suryasarathi (2016) Chitosan Immobilized Porous Polyolefin As Sustainable and Efficient Antibacterial Membranes. In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 4 (3). pp. 862-870.

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Official URL: http://dx.doi.org/10.1021/acssuschemeng.5b00912


Polyolefinic membranes have attracted a great deal of interest owing to their ease of processing and chemical inertness. In this study, porous polyolefin membranes were derived by selectively etching PEO from PE/PEO (polyethylene/poly(ethylene oxide)) blends. The hydrophobic polyolefin (low density polyethylene) was treated with UV-ozone followed by dip coating in chitosan acetate solution to obtain a hydrophilic-antibacterial surface. The chitosan immobilized PE membranes were further characterized by Fourier transform infrared spectroscope (FTIR) and X-ray photoelectron spectroscope (XPS). It was found that surface grafting of chitosan onto PE membranes enhanced the surface roughness and the concentration of nitrogen (or amine) scaled with increasing concentration of chitosan (0.25 to 2% wt/vol), as inferred from Kjeldahl nitrogen analysis. The pure water flux was almost similar for chitosan immobilized PE membranes as compared to membranes without chitosan. The bacterial population, substantially reduced for membranes with higher concentration of chitosan. For instance, 90 and 94% reduction in Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) colony forming unit respectively was observed with 2% wt/vol of chitosan. This study opens new avenues in designing polyolefinic based antibacterial membranes for water purification.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Keywords: PE/PEO blends; Chitosan; UV-ozone; Antibacterial membrane
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 07 Apr 2016 05:59
Last Modified: 07 Apr 2016 05:59
URI: http://eprints.iisc.ac.in/id/eprint/53613

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