布洛芬固定膜TiO_2光催化降解特性研究  

Study on the photocatalytic degradation characteristics of ibuprofen with immobilized TiO_2 catalyst

作　　者：林少华[1] 杨娣娣 路婧婧[1] 周婷婷[1] 

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]南通市自来水公司,江苏南通226009

出　　处：《南京林业大学学报（自然科学版）》2013年第4期90-94,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：江苏省环境科学与工程重点实验室开放课题(zd111201)

摘　　要：采用小型光催化反应装置,以溶胶-凝胶法负载于玻璃纤维网上的固定膜TiO2为催化剂对布洛芬(IBP)进行光催化降解,分析了吸附、光解、IBP初始浓度、溶液初始pH和投加H2O2剂量对TiO2催化剂降解布洛芬的影响,并考察了IBP的矿化过程,对IBP降解中间产物进行定性分析。结果表明:吸附作用和在UV365下光解作用对降解布洛芬的影响不明显;IBP在较低浓度范围内,其降解呈伪一级反应,反应速率常数随初始浓度增大而减小;随着溶液初始pH的增大,IBP的光催化降解速率逐渐降低;H2O2投加剂量对IBP光催化降解影响显著,这是IBP在水中存在状态和TiO2界面电荷性质受到pH影响所致,为提高光催化降解布洛芬速率,较适宜的H2O2投加剂量为2.5 mg/L左右。光催化对IBP有较好的矿化作用。LC-MS分析表明,.OH攻击作用是IBP光催化降解的基本途径。To reveal the photocatalytic degradation characteristics of ibuprofen（ IBP）, the effects of adsorption, photoly- sis, initial concentration, initial pH value and H2O2 dosage on the degradation of ibuprofen were explored by photoreac- tor with immobilized TiO2 catalyst supported on fiberglass net by solgel method. Mineralization and intermediates were also investigated.： Results indicated that adsorption and photolysis under UV365 had little effects on IBP degradation. The degradation of IBP followed pseudlo-first-order kinetics under studied conditions, and the pseudo-first-order kinetic constants decreased with the increase of initial concentration. The photocatalytic degradation rate decreased with the in- crease of initial pH, for that the existing forms of IBP in the solution and the electric charge of TiO2 surface were con- trolled by pH. The photoeatalytie degradation rate of IBP was significantly affected by H2O2 dosage, and the suitable, a- mount of H2O2 was about 2.5 mg/L. It was also indicated that TOC was removed effectively. According to the LC-MS data, hydroxylation addition to the parent pharmaceutical was proposed as the fundamental degradation pathway.

关 键 词：布洛芬 固定膜 光催化 二氧化钛 

分 类 号：R994.6[医药卫生—毒理学]