摘要
对水体中邻苯二甲酸二异辛酯(DEHP)在紫外光照射下降解情况进行了分析。结果表明, DEHP遵循一级动力学方程进行紫外光解。其紫外光解半衰期在9．63-15．23 min。在不同pH溶液中DEHP紫外光解都生成了邻苯二甲酸单异辛酯和邻苯二甲酸,推测反应机制为:紫外光激发诱导DEHP酯基团断裂,并与H+或OH-进行结合反应。溶液酸、碱性越强,越利于DEHP的水解电离,从而促进此物质紫外光解。此结论可为紫外光照射处理DEHP污染水体提供一定的参考依据。
The present study mainly concerned the UV-photolysis of di-(2-ethylhexyl) phthalate (DEHP) in water. The results indicated that DEHP photolysis followed pseudo-first-order kinetics under UV-irradiation in different pH solutions and the half-lives of DEHP UV-photolysis were approximately 9. 63- 15. 23 min. The photoproduct analysis showed that mono-(2-ethylhexyl) phthalate and phthalic acid were produced during DEHP UV-photolysis in all pH solutions, which meant that the ester group of DEHP broke down and then reacted with H+ /OH-. The high acid or basic solution could improve ionization levels to accelerate DEHP UV-photolysis. These results could give a new insight in the control DEHP of pollution with UV-irradiation.
出处
《给水排水》
CSCD
北大核心
2006年第z1期178-181,共4页
Water & Wastewater Engineering
基金
国家"十五"重点科技攻关项目(2003DFBA0008)资助
