Abstract
Abstract Water pollution is one of the most urgent challenges of the 21st century, with water security having widespread consequences on society and the global economy. Methylene blue (MB) is a toxic by-product of textile and dye industries which has polluted wastewaters. Biofouling of man-made surfaces is a longstanding issue with serious consequences in the maritime and water treatment industries. Ag and its compounds are historically well-known as antibacterial agents, whilst polyethyleneimine (PEI) has good stabilizing and adsorption properties. In this work, colloidal Ag nanomaterials (diameter ∼2.6 ± 1.1 nm) produced using PEI as the capping agent demonstrated potential as antifouling photocatalysts for water treatment applications. The photocatalytic effect of Ag-PEI was studied using UV-visible spectrophotometry on the decomposition of methylene blue, with a 90.2% peak reduction of its UV-visible spectral peaks and decoloration recorded after 90 minutes of UV-irradiation. Separately, Ag-PEI demonstrated a 63% reduction of biofilm formation by Halomonas pacifica, a model marine-biofilm bacterium, through a static biofilm assay.
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