Attachment of silver nanoparticles (AgNPs) onto thin-film composite (TFC) membranes through covalent bonding to reduce membrane biofouling

ACS Appl. Mater. Interfaces

2016

Microbial attachment and biofilm formation on filtration membrane can greatly compromise its flux and separation efficiency. Here, a simple and facile approach has been developed to in situ generate silver nanoparticles (Ag NPs) on the thin film composite forward osmosis (TFC FO) membrane for sustainable antibiofouling performances. Mussel-inspired dopamine chemistry was applied to grow polydopamine coating on both surfaces of FO membranes, followed by the generation of Ag NPs upon a simple dip coating in silver nitrate aqueous solution. Furthermore, the Ag NPs deposited membranes had a long-term silver release profile with rechargability for multiple times upon their depletion, and exhibited strong sustainable bactericidal efficacy against Gram-negative bacteria and Grampositive bacteria. The Ag NPs had a controllable effect on the membrane performances including the water flux and reverse salt flux in the FO test mode. Our practicable antibacterial strategy may apply to other types of filtration membranes with diverse material surfaces and may pave a new way to achieve the sustainable membrane antibiofouling performance on a large scale.

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Sustainable Antibiofouling Properties of Thin Film Composite Forward Osmosis Membrane with Rechargeable Silver Nanoparticles Loading

ACS Appl. Mater. Interfaces

2016

“…AgNPs were also attached to the surface of TFC membrane effectively via covalent banding, and the AgNPs showed good stability 19 . These reports indicated that AgNPs could be immobilized to the TFC membrane effectively and improved the antibacterial and antifouling properties.…”

Section: Introductionmentioning

confidence: 99%

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

Fang

et al. 2015

Desalination

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.

“…For instance, it has been 72 shown that TFC membranes functionalized with silver or copper nanoparticles presented a 73 diminished susceptibility to biofouling [12,13]. Alternatively, carbon-based nanomaterials 74 such as carbon nanotubes (CNTs) and graphene oxide (GO) have also been linked to the 75 polyamide layer to generate TFC membranes with enhanced antimicrobial properties [14][15][16].…”

mentioning

confidence: 99%

Thin-film composite forward osmosis membranes functionalized with graphene oxide–silver nanocomposites for biofouling control

Faria

Journal of Membrane Science

Xie

et al. 2017

195

Elimelech, M. (2017). Thin-film composite forward osmosis membranes functionalized with graphene oxide-silver nanocomposites for biofouling control. Journal of Membrane Science, Thin-film composite forward osmosis membranes functionalized with graphene oxide-silver nanocomposites for biofouling control AbstractInnovative approaches to prevent bacterial attachment and biofilm growth on membranes are critically needed to avoid decreasing membrane performance due to biofouling. In this study, we propose the fabrication of anti-biofouling thin-film composite membranes functionalized with graphene oxide-silver nanocomposites. In our membrane modification strategy, carboxyl groups on the graphene oxide-silver nanosheets are covalently bonded to carboxyl groups on the surface of thin-film composite membranes via a crosslinking reaction. Further characterization, such as scanning electron microscopy and Raman spectroscopy, revealed the immobilization of graphene oxide-silver nanocomposites on the membrane surface. Graphene oxide-silver modified membranes exhibited an 80% inactivation rate against attached . Pseudomonas aeruginosa cells. In addition to a static antimicrobial assay, our study also provided insights on the anti-biofouling property of forward osmosis membranes during dynamic operation in a cross-flow test cell. Functionalization with graphene oxide-silver nanocomposites resulted in a promising anti-biofouling property without sacrificing the membrane intrinsic transport properties. Our results demonstrated that the use of graphene oxide-silver nanocomposites is a feasible and attractive approach for the development of antibiofouling thin-film composite membranes. Innovative approaches to prevent bacterial attachment and biofilm growth on membranes are 28 critically needed to avoid decreasing membrane performance due to biofouling. In this study, 29we propose the fabrication of anti-biofouling thin-film composite membranes functionalized 30 with graphene oxide−silver nanocomposites. In our membrane modification strategy, 31 carboxyl groups on the graphene oxide−silver nanosheets are covalently bonded to carboxyl 32 groups on the surface of thin-film composite membranes via a crosslinking reaction. Further 33 characterization, such as scanning electron microscopy and Raman spectroscopy, revealed the 34 immobilization of graphene oxide−silver nanocomposites on the membrane surface. 35Graphene oxide−silver modified membranes exhibited an 80% inactivation rate against 36attached Pseudomonas aeruginosa cells. In addition to a static antimicrobial assay, our study 37 also provides insights on the anti-biofouling property of forward osmosis membranes during 38 dynamic operation in a cross-flow test cell. Functionalization with graphene oxide−silver 39 nanocomposites resulted in a promising anti-biofouling property without sacrificing the 40 membrane intrinsic transport properties. Our results demonstrated that the use of graphene 41 oxide−silver nanocomposites is a feasible and attractive approach for the develop...