Fouling of reverse osmosis (RO) membrane surfaces can significantly reduce water quality and quantity during operation. Therefore, to increase the longevity of membranes and to improve RO efficiency, we developed multifunctional membranes enabled with photothermal, bactericidal, and hydrophilic properties. This was accomplished using modifications of graphene oxide (GO) nanosheets and Au nanostars (AuNS) combined with hydrophilic polyethylene glycol (PEG) on polyamide (PA) membrane surfaces. Systematic characterizations were performed to demonstrate reductions in (CaCO3 and CaSO4), organic fouling (humic acid) and biofouling (Escherichia coli). In particular, the photothermal capabilities of AuNS on the membrane surface facilitated localized heating to kill bacteria and prevent biofilm formation. The AuNS modification also demonstrated anti-scaling properties in addition to its intended function of bacterial lysis. This novel, innovative membrane design has the potential to dramatically enhance RO water treatment processes.

Nanostructure-enabled membranes for improved reverse osmosis processes

251st National Meeting (2016)

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