In Situ Photocatalytic Synthesis of Ag Nanoparticles (nAg) by Crumpled Graphene Oxide Composite Membranes for Filtration and Disinfection Applications

Environmental Science & Technology
Yi JiangJohn D Fortner

Abstract

Graphene oxide (GO) materials have demonstrated considerable potential in next-generation water treatment membrane-based technologies, which include antimicrobial applications. GO antimicrobial properties can be further enhanced by preloading or chemically generating surface-associated nanoscale silver particles (nAg). However, for these systems, enhanced antimicrobial functionality decreases over time as a function of Ag mass loss via dissolution (as Ag(+)). In this work, we demonstrate facile photocatalytic in situ synthesis of nAg particles by crumpled GO-TiO2 (GOTI) nanocomposites as an approach to (re)generate, and thus maintain, enhanced antimicrobial activity over extended operation times. The described photocatalytic formation process is highly efficient and relatively fast, producing nAg particles over a size range of 40 to 120 nm and with active (111) planes. Additionally, we show in situ surface-based photocatalyzed synthesis of nAg particles at the surface of GOTI nanocomposite membrane assemblies, allowing for simultaneous filtration and disinfection. With ca. 3 log inactivation for both Escherichia coli and Bacillus subtilis, the described membrane assemblies with in situ formed nAg demonstrate enhanced antimicrob...Continue Reading

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Citations

Jun 2, 2016·Environmental Science & Technology·Yi JiangPratim Biswas
Apr 4, 2018·Membranes·Claudia UrsinoAlberto Figoli
Jul 22, 2018·Chemistry : a European Journal·Hui MiaoGuoxiu Wang
May 8, 2018·Environmental Science and Pollution Research International·Feng WeiXiaojun Han
Jan 9, 2019·Nature Nanotechnology·Nariman YousefiNathalie Tufenkji

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