几种环境激素酞酸酯的光催化降解研究

STUDY ON PHOTOCATALYTIC DEGRADATION OF SOME ENVIRONMENTAL HORMONE PAE

在紫外光照射下,以TiO2为催化剂,研究邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二环己酯(DCHP)和邻苯二甲酸丁基苄基酯(BBP)水溶液的光催化降解规律,不同结构特征的酞酸酯在降解过程中pH值均表现为先升高,再降低的趋势.降解为表观一级反应.采用色质联用技术(GC-MS)分别对上述物质降解过程中生成的中间体进行分析,提出了可能的降解机理.

The photocatalytic degradation rules of phthalic acid esters （PAE） such as DBP （dibutyl phthalate）, DCHP （dicyclohexyl phthalate） and BBP （butyl benzyl phthalate） were studied in aqueous TiO2 dispersions under UV irradiation. The pH shows ascending firstly then falling in every photocatalytic reaction system. The experiment shows that the photocatalytic d egradation of PAE was pseudo first-order reaction kinetics. The intermediates of degradation were analyzed by GC-MS and the possible degradation mechanism was proposed.