摘要
基于苯酚降解中间产物(苯醌)、酸性甲基橙的目标化合物,研究了苯醌类与苯醌亚胺类在光/Fenton体系中的降解特性,分析了苯醌及酸性甲基橙的光敏特性,测定了光敏剂存在的情况下日光/Fenton和UV/Fenton体系中·OH的产量.结果表明,苯醌类光解,由于其光敏性好,能促进日光体系产生更多的·OH,日光/Fenton法好于UV/Fenton法.苯醌亚胺类降解,浓度较低时,UV/Fenton法好,浓度较高时,日光/Fenton法好,造成这种现象的主要原因是苯醌亚胺类光敏性一般,浓度低时日光体系中·OH的产量少于紫外体系,但苯醌亚胺类降解过程中有苯醌类生成,苯醌类的光敏性比苯醌亚胺类好,苯醌亚胺类浓度越高,其降解产物中苯醌类越多,进而导致日光体系中~1O_2、O_2^-·和·OH的产量多于紫外体系.
Based on the model compounds of benzoquinone and acid methyl orange, the degradation characters ofbenzoquinones and benzoquinoneimines in the light/Fenton system were investigated. The photosensitivity ofbenzoquinone and acid methyl orange was analyzed by measuring the yield of ·OH in the sunlight/Fenton and UV/Fentonsystem, respectively. The results demonstrated that sunlight/Fenton method was better than the UV/Fenton method for thedegradation of benzoquinones, due to its higher photosesitity, more ·OH produced in the sunlight system. Forbenzoquinoneimines, UV/Fenton was better than sunlight/Fenton at lower concentration, but sunlight/Fenton was better athigher concentration. The reason was that benzoquinoneimines was not a good photosensitizer with a lower yield of ·OHin 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 thatcould generate 1O2、O2-· and ·OH in sunlight system, thereby more benzoquinones generated with higher concentration ofbenzoquinoneinines resulting fast degradation in sunlight system.
作者
贺俊梅
孔令娜
梁倩
张乃东
郑彤
HE Jun-mei;KONG Ling-na;LIANG Qian;ZHANG Nai-dong;ZHENG Tong(College of Environmental Science and Engineering,Dalian Maritime University, Dalian 116026, China;State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology, Harbin 150090, China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2016年第9期2638-2644,共7页
China Environmental Science
基金
哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金(QAK201503)
