Photosensitivity of benzoquinones and benzoquinoneimines in the sunlight/fenton system
HE Jun-mei1, KONG Ling-na1, LIANG Qian1, ZHANG Nai-dong1,2, ZHENG Tong2
1. College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China;
2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Based on the model compounds of benzoquinone and acid methyl orange, the degradation characters of benzoquinones and benzoquinoneimines in the light/Fenton system were investigated. The photosensitivity of benzoquinone and acid methyl orange was analyzed by measuring the yield of ·OH in the sunlight/Fenton and UV/Fenton system, respectively. The results demonstrated that sunlight/Fenton method was better than the UV/Fenton method for the degradation of benzoquinones, due to its higher photosesitity, more ·OH produced in the sunlight system. For benzoquinoneimines, UV/Fenton was better than sunlight/Fenton at lower concentration, but sunlight/Fenton was better at higher concentration. The reason was that benzoquinoneimines was not a good photosensitizer with a lower yield of ·OH in the sunlight system, so UV system was better with lower concentration of benzoquinoneimines. Nevertheless, benzoquinones could be generated during the degradation of benzoquinoneimines, which was a better photosensitizer that could generate 1O2、O2-· and ·OH in sunlight system, thereby more benzoquinones generated with higher concentration of benzoquinoneinines resulting fast degradation in sunlight system.
贺俊梅, 孔令娜, 梁倩, 张乃东, 郑彤. 苯醌类与苯醌亚胺类在日光/Fenton体系中的光敏性[J]. 中国环境科学, 2016, 36(9): 2638-2644.
HE Jun-mei, KONG Ling-na, LIANG Qian, ZHANG Nai-dong, ZHENG Tong. Photosensitivity of benzoquinones and benzoquinoneimines in the sunlight/fenton system. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(9): 2638-2644.
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