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| 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 |
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Abstract 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.
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Received: 20 December 2015
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