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Effect of HNTs modification in nanocomposite membrane enhancement for bacterial removal by cross-flow ultrafiltration system

Moslehyani, A. and Mobaraki, M. and Ismail, A. F. and Matsuura, T. and Hashemifard, S. A. and Othman, M. H. D. and DashtArzhandi, M. R. and Soheilmoghaddam, M. and Shamsaeie, E. (2015) Effect of HNTs modification in nanocomposite membrane enhancement for bacterial removal by cross-flow ultrafiltration system. Reactive And Functiol Polymers, 95 . pp. 80-87. ISSN 1381-5148

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Official URL: http://dx.doi.org/10.1016/j.reactfunctpolym.2015.0...

Abstract

This study investigated the potential of silver lactate (SL)-holloysite nanotube clay (HNTs) nano-filler embedded into the polyvinylidene fluoride (PVDF) polymer matrix as an antibacterial separator. Three different nanocomposite membranes were fabricated via phase inversion technique aimed to enhance the permeation flux and fouling resistance with complete bacterial rejection. HNT has been modified by N-β-(aminoethyl)-É£-aminopropyltrimethoxy silane (AEAPTMS) aiming for immobilization of SL on the surface HNT during dope preparation. Salmonella and Enterobacter aerogenes (E. aerogenes) were considered as two types of bacteria to be removed from contaminated water in this experimental work. Nanocomposite membranes were characterized and analyzed by thermal gravimetric analysis (TGA), Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM) combined with energy dispersive X-ray (EDX), X-ray photoelectron spectroscope (XPS), atomic force microscopy (AFM), contact angle, molecular weight cut-off (MWCO) and tensile strength. Potential silver ion loss was assessed by measuring the silver content in the coagulation bath and in the UF permeate using inductive-coupled plasma mass spectrometer (ICP-MS). Moreover, antibacterial effect of the membrane was examined in terms of removal of microorganisms by filtration, Log Reduction Value (LRV) and thickness of inhibition zone. From the experimental results, the prepared nanocomposite membranes have shown more than 99% bacterial rejection, LRV of more than 3 and broad inhibition zones in the agar plate. In particular, the nanocomposite membrane consisting M-HNTs/SL/PVDF showed significant improvement in permeation flux and flux declination among all the tested membranes. It was also found that modification of HNTs resulted in reduction of silver leaching by uniform distributing of SL, which contributed to significant inhibition for both types of growth bacteria within 24 h of incubation.

Item Type:Article
Uncontrolled Keywords:nanocomposite, membrane, antibacterial
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:58374
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 04:07
Last Modified:27 Oct 2021 07:19

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