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The antibacterial effect of nitrogen-doped TiO 2 and ZrO 2 were tested on Escherichia coli and biofilm heterotrophic bacteria under solar light illumination. The rates of photocatalytic inactivation for biofilm bacteria with soluble extracellular polymeric substances (EPS) stripped off and E. coli bacteria were found to be higher than those of the biofilm bacteria with intact EPS....
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