Capture of phosphates in surface water by TiO2 nanoparticles under UV irradiation |
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| Authors: | Hongyong Xie Qi Zheng Shanzhu Wang Changwen Ma Guilan Gao Naici Bing Zhiguo Sun |
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| Institution: | [1]School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, China [2]Shanghai Pudong Hydrology and Water Resource Administration, Shanghai 200129, China |
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| Abstract: | The capture of orthophosphates and total phosphorus from the Pudong Canal river in the Pudong District of Shanghai by TiO_2 nanoparticles is studied using a rotating photoreactor and the nano-TiO_2 photocatalyst Degussa P25.The effects of UV irradiation intensity in a range of 20-74 mW/cm2.the loading of the TiO_2nanoparticles 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 TiO_2 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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| Keywords: | Orthophosphates Total phosphorus Surface water TiO2 nanoparticles UV irradiation |
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