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.
出处
《应用化学》
CAS
CSCD
北大核心
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)
关键词
邻苯二甲酸二丁酯
光催化降解
降解机理
二氧化钛
dibutyl phthalate,photocatalytic degradation, degradation mechanism, titanium dioxide
