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UV/TiO₂薄膜体系光降解酞酸酯研究

Photodegradation of phthalic acid esters by UV/TiO₂ thin film system

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【Author】 Chen Deqiang~(1,2) Wu Zhenbin~2 Cheng Shuiping~2 Zhong Fei~2 Chen Yiqun~1(1.College of Environmental Science and Engineering,Hohai University, Nanjing 210098;2.State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072)

【机构】河海大学环境科学与工程学院；中国科学院水生生物研究所淡水生态与生物技术国家重点实验室；河海大学环境科学与工程学院南京210098；武汉430072；南京210098；

【摘要】采用自制玻璃负载TiO2薄膜,研究了UV-V is/TiO2以及UV/TiO2/H2O2体系对2种酞酸酯DBP和DEHP的光催化降解情况。研究结果表明,TiO2在暗处对酞酸酯没有降解作用;UV/TiO2体系能有效光降解DBP和DEHP,TiO2具有明显的光催化作用,增强因子分别为fDBP=2.06,fDEHP=1.53;在一定浓度范围内DBP在UV/TiO2体系中的降解速率与其初始浓度成负一级动力学关系;UV/TiO2/H2O2体系对DBP的光降解能力远大于UV/TiO2和UV/H2O2体系,H2O2能显著提高TiO2的光催化活性。更多还原

【Abstract】 The photodegradation of dibutyl phthalate（DBP） and di（2-ethylhexyl） phthalate（DEHP） in UV-Vis/TiO₂ and UV/TiO₂/H₂O₂ systems was studied.The results showed that the two phthalates were not degraded by TiO₂ thin films in dark,but effectively degraded by UV/TiO₂ systems.The synergetic effect of UV and H₂O₂ was obvious and the promoted coefficients were 2.06 and 1.53 for DBP and DEHP degradation respectively.The initial concentration of DBP presented negative effect to pseudo-first-order reaction kinetics constant of its photodegradation in UV/TiO₂ system.The UV/TiO₂/H₂O₂ displayed far more stronger photodegradant ability than UV/TiO₂ and UV/H₂O₂ systems and the presence of H₂O₂ could promote photocalytic activity of TiO₂ significantly.更多还原