Influencing of aquatic organic matters on UV photocatalytic reduction efficiency of bromate
HU Hang-kai1, XU Hao-dan2, LU Xiao-hui2, WANG Li-zhang3, MA Jun2, SONG Shuang1, WANG Da1,3
1. Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China; 2. State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; 3. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Abstract：TiO2 and TiOF2 were prepared by a one-step hydrothermal method and their efficiencies of BrO3− reduction under UV photocatalysis were investigated in water matrix. In pure water, 78.5% of BrO3− was reduced by UV/TiO2 after 120min, which was significantly higher than that on UV/TiOF2 (57.0%). While in water contained refractory organic pollutant (atrazine, ATZ) or natural organic matter (humic acid, HA), the results were opposite to those in pure water. UV/TiOF2 achieved superior simultaneous ATZ degradation and BrO3− reduction when refractory organic pollutant co-existed with BrO3−. The ATZ degradation and BrO3− reduction rates reached 48.5% and 99.0% after 120min when 20 μmol/L ATZ and 20μmol/L BrO3− co-existed in the solution. The BrO3− reduction efficiencies of UV/TiO2 and UV/TiOF2were 13.8% and 29.8% when 5mg/L of HA was added into the solution, demonstrating that compared with UV/TiO2, UV/TiOF2 revealed robust BrO3− reduction ability in the complex water constituents. TiOF2 presented stronger resistance to water matrix applied in UV photocatalytic advanced water purification system.
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