Studies on the photodecomposition mechanism of 2,4,6-trichlorophenol in water under sunlight irradiation
TAI Chao1, ZHANG Shao-dong1, YIN Yong-guang2, WU Hao-xian1,2, WANG Jing1
1. Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, China;
2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, State Key Laboratory of Environmental Chemistry and Ecotoxicology, Beijing 100085, China
The photodecompositions of 2,4,6-trichlorophenol (2,4,6-TCP) in pure water, dissolved organic matter (DOM) solution, and actual surface water were studied comparatively. The results indicate that there are three pathways in the photodecomposition of 2,4,6-TCP, including direct photolysis, sensitized photolysis, and self-sensitized photolysis. Direct photolysis and self-sensitized are found to be involved in the photolysis of 2,4,6-trichlorophenol in pure water, with singlet oxygen as main active species. Besides direct photolysis, sensitized photolysis of 2,4,6-trichlorophenol is also found in presence of DOM with singlet oxygen and hydroxyl radical as main active species. The degradation rates of 2,4,6-trichlorophenol in pure, DOM-contained and actual surface water all increase with the oxygen content in solution. The visible light has no contribution for the direct photolysis of 2,4,6-TCP, and UVA contribution is 72.60%. While in presence of dissolved organic matter, about 12.39% contribution of visible light is found, and the contribution of UVA is 52.73% in DOM solution. The photolysis of 2,4,6-trichlorophenol in actual surface water is similar to that in DOM solution, in which DO and DOM are the dominant factors in the indirect photolysis of 2,4,6-TCP.
邰超, 张少栋, 阴永光, 吴浩贤, 王静. 太阳光下水中2,4,6-三氯酚的光解机制研究[J]. 中国环境科学, 2016, 36(8): 2380-2387.
TAI Chao, ZHANG Shao-dong, YIN Yong-guang, WU Hao-xian, WANG Jing. Studies on the photodecomposition mechanism of 2,4,6-trichlorophenol in water under sunlight irradiation. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(8): 2380-2387.
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