Abstract
Nitrate nitrogen in water, especially in groundwater, is a major problem in the current drinking water environment. In this study, copper- and nickel-modified phosphotungstate catalysts supported on TiO2 were prepared by the sol-gel solvothermal method, and photocatalytic reduction by phosphotungstate was used to remove nitrate nitrogen in water under ultraviolet irradiation. The maximum removal rate was 59.60% with 0.8g/L Cu-H3PW12O40/TiO2, 90mg/L nitrate nitrogen, and 60min reaction time. For Ni-H3PW12O40/TiO2, the maximum removal rate of nitrate nitrogen was 54.58%, achieved with a catalyst concentration of 0.8g/L, nitrate nitrogen concentration of 120mg/L, and reaction time of 30min. Both catalysts could remove nitrate nitrogen from water under the condition of photocatalysis.
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