FURI | Fall 2021

Antimicrobial Effect of Sulfidized Silver Nanoparticles After a 17 Day Continuous Operation in a Reverse Osmosis Membrane Module for Biofouling Control

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Silver is used for the in-situ formation of silver nanoparticles (Ag NPs) on thin-film composite reverse osmosis membranes to mitigate biofilm formation. A concentration of 10 mM NaNO3 with Na2S was used to form a partial Ag2S layer observed to slow down the release of silver nanoparticles. In this study, a toxicity assay using Pseudomonas aeruginosa was performed on spent modules to observe the antimicrobial activity of sulfidized silver-coated membranes after the 17-day testbed operation compared to pristine Ag NPs. The anti-biofouling performance is expected to last longer in sulfidized Ag NPs than in Ag NPs.

Student researcher

Dianne Carrillo

Chemical engineering

Hometown: Glendale, Arizona, United States

Graduation date: Spring 2022