FURI | Spring 2021

Antimicrobial Effect of Sulfidized Silver Nanoparticles After a Three-Month Operation Period in a Reverse Osmosis 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. Different concentrations (10-1, 10-3, and 10-5 M) of Na2S to form a partial Ag2S layer were observed to slow down the release of silver nanoparticles. A testbed trial of the sufidized Ag NPs coated membranes operated for three months. In this study, a toxicity assay using Pseudomonas aeruginosa was done on spent modules to observe antimicrobial activity and determine if sulfidized silver helped maintain the antimicrobial performance of silver nanoparticles after the three-month operation.

Student researcher

Dianne Carrillo

Chemical engineering

Hometown: Glendale, Arizona, United States

Graduation date: Spring 2022