生态环境学报2009，Vol.18Issue(5)：1715-1720,6.
磁赤铁矿/多羧基有机酸体系中五氯酚的异相光化学降解
Pentachlorophenol degradation in heterogeneous photo-maghemite-carboxylic acids system
摘要
Abstract
In nature, iron oxides and carboxylic acids ubiquitously coexist in air, water surface and soil surface, in which a heteroge-neous photo-Fenton-like reaction system can be set up to form H_2O_2 and ·OH that can oxidize almost all the organic compounds. The photodegradation of pentachlorophenol (PCP) in heterogeneous photo-maghemite-carboxylic acids system was investigated in this study under lab conditions. The efficiency of PCP degradation depended on the wavelength, the kind of carboxylic acids and the existence of oxygen. The high degradation rates could be obtained under UV-A rather than VIS. Oxalic acid largely promoted the rate of photodegradation and dechiorination of PCP while citric acid could not work like oxalic acid. Oxygen was necessary for the for-mation of active species (e.g. H_2O_2) and the degradation of PCP can be well described by the first-order kinetic model. After 1 h re-action time under optimum condition, the degradation ratio and the declorination ratio of PCP were above 80% and 35%, respectively. The quantitative study for the formation of H_2O_2 well explained the difference of the ability of system under different conditions.关键词
磁赤铁矿/多羧基有机酸/五氯酚/过氧化氢/异相芬顿(Fenton)Key words
maghemite/ carboxylic acids/ pentachlorophenol/ hydrogen peroxide/ heterogeneous Fenton分类
资源环境引用本文复制引用
兰青,车远,刘承帅..磁赤铁矿/多羧基有机酸体系中五氯酚的异相光化学降解[J].生态环境学报,2009,18(5):1715-1720,6.基金项目
国家自然科学基金项目(20377011) （20377011）
