The anti-biofouling properties of thin-film composite nanofiltration membranes grafted with biogenic silver nanoparticles

Abstract

2015) 'The anti-biofouling properties of thin-lm composite nanoltration membranes grafted with biogenic silver nanoparticles. ', Desalination., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACT:Biofouling is still one of the most challenging issues of nanofiltration.One of the practical strategies to reduce biofouling is to develop novel anti-biofouling membranes. Herein, biogenic silver nanoparticles (BioAg 0 -6) with the averaged diameter of only 6nm were firstly grafted on the surface of polyamide NF membrane.The effect of grafted BioAg 0 -6 on the performance of thin-film composite (TFC) NF membranes was systematically investigated with a comparison to the grafted chemical AgNPs. BioAg 0 -6 grafted membrane (TFC-S-BioAg) increased the hydrophilicity of the TFC membrane and water permeability, while maintaining the relatively high salt rejection. The result of silver leaching experiment indicated that the grafted BioAg 0 -6 had a better stability on the membranes, the ratio of remained silver in the TFC-S-BioAg membrane was 95%, after soaked in pure water for 50 days. After 4 months immersion, the rejection of TFC-S-BioAg membrane remained more than 90% of initial rejection. The results of disk diffusion test revealed that both of TFC-S-BioAg membrane and TFC-S-ChemAg membrane showed effective anti-bacterial ability to inhibit P.aeruginosa and E.coli growth, the TFC-S-BioAg membrane showed more excellent and longer lasting antibacterial property. Therefore, BioAg 0 -6 grafed TFC membranes could be potential as an effective strategy to decrease biofouling in nanofiltration process.

Effects of zinc oxide Nanospheres on the Separation performance of Hollow fiber poly(piperazine-amide) composite nanofiltration membranes

“…It is well known that Donnan exclusion and steric repulsion mechanism are the two critical factors for the studied polyamide NF membrane [51,52]. A strong electrostatic repulsion between the multivalent anions (SO 4 2− ) and the polyamide layer surface will result in a higher rejection of multivalent anions (SO 4 2− ) than that of monovalentions (Cl − ). The hydrophilic membranes modified by the addition of a small amount of ZnO nanospheres could maintain a good salt separation capability and a high water flux.…”

“…Most of NF membranes are thin-film composite (TFC) membranes with the active layer commonly formed on the top surface of porous flat sheet membranes [4,5]. With the self-support structure and high-packing density, hollow fiber membrane used as the support for the preparation of composite NF membrane has attracted more and more attention [6][7][8].…”

A novel nanofiltration membrane with simultaneously enhanced antifouling and antibacterial properties

“…3,4 Unfortunately, as with all of the membrane ltration processes, an inherent problem with NF is the reduced production efficiency due to fouling of the membrane surface by microorganisms, colloidal materials and dissolved organics. [5][6][7] The main factors affecting membrane fouling are roughness and hydrophilicity, as well as the chemical and physical properties of the feed water. 8,9 The fouling extent of the membrane varies, depending on the structural properties of the membrane.…”

Modification of poly(amide-urethane-imide) (PAUI) thin film composite reverse osmosis membrane with nano-silver particles

“…Furthermore, there are also various membranes reported by loading silver (silver ion or nanoparticle) onto the membrane surface through different methods to improve the anti-biofouling performance. [67][68][69][70][71][72][73][74][75][76] For example, Dong et al in situ immobilized silver nanoparticles (AgNPs) onto the commercial polyamide RO membrane (virgin membrane) surface via a two-step surface modication process to improve the membrane's anti-biofouling property. 68 Chou et al prepared the silver-loaded cellulose acetate hollow ber membrane by dissolving AgNO 3 in the polymeric casting solution, and the hybrid membrane was evaluated antibacterial activity against both Escherichia coli and Staphylococcus aureus.…”

“…70 Liu et al also demonstrated that the hybrid PA/Ag nanocomposite membrane possessed dramatic anti-biofouling effect by using layer-by-layer (LbL) assembly method. 73,74 Wu and Yang et al loaded Ag nanoparticles by using polydopamine (PDA) as nano-template on the PA layer and the resultant nanocomposite membranes showed the potential towards long lasting and regenerable anti-biofouling ability in membrane systems. 75,76 Obviously, loading silver onto the polymeric membrane makes signicant contribution to membrane anti-biofouling performance.…”