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Ag(0); Ag2O; Titania dioxide; Photocatalysis; Selective nitrate reduction
With the utilization of soluble nitrogen-based fertilizers, consumption of animal products and production of nitrogen contained wastewater, more nitrate (NO3−) is being discharged into rivers and lakes . In addition of CC0651 caused by nitrate pollution, nitrate and its metabolites, particularly nitrite (NO2−) produced from the reduction of nitrate, are toxic to human beings. Previous studies suggested that nitrate could combine with hemoglobin to form methemoglobin and caused blue baby syndrome, and nitrosamine formed from nitrite could also cause hypertension and cancers  and . Considering the toxicity of nitrate and its metabolites to human beings, the U.S. Environmental Protection Agency (EPA) has set the maximum allowable contamination level of 10 mg L−1 of nitrate–nitrogen (NO3-N) in drinking water .