Capture of phosphates in surface water by TiO2 nanoparticles under UV irradiation |
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| Institution: | 1. Department of Soils, Federal University of Santa Maria, Av. Roraima 1000, Building 42 – Office 3311A, Postal 97105-900, Santa Maria, RS, Brazil;2. Large Lakes Observatory, University of Minnesota Duluth, Research Laboratory Building 109, 55812-3024, Duluth, MN, United States;1. Fundação Universidade Regional de Blumenau, Rua São Paulo, 3250 – Itoupava Seca, Blumenau, SC 89030-080, Brazil;2. UMR SAS, INRA, Agrocampus Ouest, 35000 Rennes, France |
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| Abstract: | 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 TiO2 nanoparticles in a range of 0.05–0.1 g/L, irradiation time up to 4 h, 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 above 36 mW/cm2, orthophosphates and total phosphorus are rapidly captured by TiO2 nanoparticles, causing an observed reduction from 0.4 mg/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 UV irradiation |
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