【作者】 刘香玲； 潘家荣； 李瑞萍； 方艳芬； 黄应平；

【Author】 Liu Xiangling PanJiarong Li Ruiping Fang Yanfen Huang Yingping (Research Center for Eco-Environmental Sciences, China Three Gorges Univ. , Yichang 443002, China)

【机构】 三峡大学生态环境科学研究中心；

【摘要】 选取有机氯酚类化合物邻氯苯酚(OCP)、对氯苯酚(PCP)及2,4-二氯苯酚(DCP)为目标化合物,在紫外光照射下(330 nm<λ<380 nm),以P25纳米TiO2作为光催化剂,研究其对目标化合物的降解特性．考察了酸度及紫外光光解对其降解行为的影响,结果表明OCP、PCP及DCP分别在 pH 6．0、4．2、5．0酸度条件下降解效果最好．在实验条件下OCP、PCP及DCP分别降解240 min、 270 min、160 min后矿化率达到100％．OCP、PCP及DCP降解速率常数分别为0．004 54、0．003 64 及0．005 03．根据实验结果及文献初步探讨了其光催化氧化降解机理．更多还原

【Abstract】 The photo-catalytic degradation of o-chlorophenol, p-chlorophenol and 2,4- dichlorophenol in TiO2 (P25) aqueous suspensions with UV irradiation(330 nm<λ<380 nm) was studied. Moreover, the effect of pH and UV illumination on degradation efficiency was also observed. The best condition for photo-catalytic degradation of o-chlorophenol, p-chlorophenol and dichlorophenol was at pH 6. 0, 4. 2 and 5. 0, respectively. TOC removal yield for o-chlorophenol, p-chlorophenol and dichlorophenol was 100% after 240min, 270min and 160min of UV irradiation. Experimental data demonstrate that the reaction rate constant of degradation of o-chlorophenol, p-chlorophenol and dichlorophenol in the presence of TiO2 is 0. 00454, 0. 00364 and 0. 00503 respectively. Meanwhile, possible mechanisms for photo-degradation of chlorophenols were discussed according to experimental data and relevant references.更多还原