The capture of orthophosphates and total phosphorus from the Pudong Canal river in the Pudong District of Shanghai by TiO2 nanoparticles is studied using a rotating photoreactor and the nano-TiO2 photocatalyst Degussa P25.The effects of UV irradiation intensity in a range of 20-74 mW/cm2.the loading of the TiO2nanoparticles in a range of 0.05-0.1 g/L,irradiation time up to 4h,and pH values in a range of 2-10.5 on the capture efficiency are investigated.The results show that the capture of orthophosphates and total P are significantly enhanced by UV irradiation;at a loading of 0.1 g/L and an irradiation intensity above36 mW/cm2,orthophosphates and total phosphorus are rapidly captured by TiO2 nanoparticles,causing an observed reduction from 0.4mg/L down to 0.02 mg/L.pH values in a range of 2-10.5 have little effect on the capture efficiency of orthophosphates and total phosphorus.
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