环境激素邻苯二甲酸二丁酯的光催化降解机理探讨  

Photocatalytic Degradation of Dibutyl Phthalate in Aqueous TiO_2 Suspension

作　　者：费学宁[1] 姜远光[1] 吕岩[1] 张天永[2] 

机构地区：[1]天津城市建设学院环境与市政工程系 [2]天津大学化工学院精细化工系

出　　处：《应用化学》2006年第1期59-63,共5页Chinese Journal of Applied Chemistry

基　　金：天津市自然科学基金资助项目(033604711);建设部科学技术项目基金(03-2-064)

摘　　要：以TiO2为催化剂,在紫外光照射下,研究了邻苯二甲酸二丁酯(DBP)水溶液的光催化降解。结果表明,TiO2能够有效催化降解溶液中的DBP,去除效率80．1％。降解过程中体系酸度发生明显变化,溶液初始 pH=6．0,反应6 h降至pH=3．57。采用色谱-质谱联机技术对不同光照时间的降解混合物进行检测,分析得出在上述条件下DBP从侧链开始降解,可生成邻苯二甲酸单丁酯、苯甲酸甲酯和苯甲酸等中间体。光照6 h以上,苯甲酸是主要降解产物之一,在此条件下难于继续降解。并提出了DBP在上述条件下可能的降解过程。The photoinduced degradation of dibutyl phthalate （DBP） with TiO2 as the catalyst in aqueous solution was investigated under ultraviolet radiation. As a result, DBP could be degraded efficiently, and the efficiency was 80. 1%. Acidity of the degradation system changed obviously during the degradation process. The initial pH of the solution was 6. 0, but it decreased to 3.57 after 6 h degradation. Some photodegradation intermediates in the different photocatalytic steps were examined and analyzed by means of GC-MS. It is coneluded that the photodegradation of DBP begins from the side chain and it can be decomposed to monobutyl phthalate, methyl benzoate and benzoic acid. After 6 h degradation, benzoic acid is one of the main products, which is difficult to decompose further under such experimental conditions. The probable degradation course is also brought forward in the paper.

关 键 词：邻苯二甲酸二丁酯 光催化降解 降解机理 二氧化钛 

分 类 号：O643[理学—物理化学] X592[理学—化学]