Nano-composite to remove dye, kill bacteria


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Researchers have synthesised1 a new nano-composite that can remove dye and pathogenic bacteria from contaminated water. They synthesised the composite with silver nanoparticles and


nano-silica as a novel antifouling adsorbent for cost-effective and ecofriendly water purification. Currently used means for synthesis of metal nanoparticles on solid support require


chemical agents, which often raises environmental and safety issues. To address this problem, the researchers fabricated well-dispersed silver nanoparticles on a nano-silica surface (NSAgNP)


through protein mediated reduction of silver ions at ambient temperature. The composite exhibited excellent dye adsorption capacity both in single and multi-component systems, and


demonstrated satisfactory tolerance against variations in pH and dye concentration. Moreover, the NSAgNP killed both planktonic cells and biofilms of gram-negative bacteria _Escherichia coli


_ and _Pseudomonas aeruginosa_ . The antibacterial activity of AgNPs retarded the initial attachment of bacteria on NSAgNP and thus significantly improved the antifouling properties of the


nanomaterial, which further inhibited biofilm formation. "High adsorption capacity, reusability, removal of dyes and bacteria from contaminated water along with the composite's


antifouling properties will provide new opportunities to develop cost-effective and ecofriendly water purification processes," says one of the researchers Sujoy Das.