自由基抑制剂对不同晶型TiO2光催化反应的影响  

Effects of hydroxyl free radical inhibitors on TiO_2 photocatalysis with different crystalline

作　　者：唐建军[1] 范小江[2] 邹原[1] 张伟[1] 周康根[2] 

机构地区：[1]深圳职业技术学院深圳市工业节水与城市污水资源化技术重点实验室,广东深圳518055 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《北京化工大学学报（自然科学版）》2009年第3期36-40,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金(50674100);深圳市科技计划项目(07K164D0)

摘　　要：以荧光光谱法研究了不同晶型TiO2的光催化反应体系中羟基自由基(·OH)的产生情况,表明在H2O2存在条件下,金红石型TiO2经可见光激发可持续稳定产生.OH,而以锐钛矿型TiO2作光催化剂时,则检测不到·OH的生成。光催化结果表明,在H2O2存在条件下,苯酚可被TiO2可见光催化降解;往反应体系加入自由基抑制剂(叔丁醇或甲醇)时,明显降低了金红石型TiO2的降解效率,但对锐钛矿型TiO2的影响较弱。以金红石型TiO2作光催化剂时,苯酚的降解反应主要发生在溶液中;而以锐钛矿型TiO2作光催化剂时,则苯酚的降解反应主要发生在催化剂的表面。Hydroxyl free radical （＂ OH） production from photocatalytic reaction systems with different crystalline forms of TiO2 as photocatalyst has been analyzed by fluorescence spectroscopy. The results indicated that · OH radicals could be constantly produced by rutile TiO2 under visible-light irradiation in the presence of H2O2, whereas · OH radicals could not be detected when using anatase TiO2 as photocatalyst. Photocatalytic results indicated that phenol could be degraded by visible-light photocatalysis with both rutile and anatase TiO2 in the presence of H202, and the presence of hydroxyl free radical inhibitors （tert-butyl alcohol or methanol） led to a significant decrease in-the degradation efficiency of rutile TiO2, but had much less effect on anatase TiO2. The degradation of phenol occurred mainly in solution when using rutile TiO2 as photocatalyst, whereas the degradation occurred mainly at the TiO2 particle surface when using anatase TiO2 as photocatalyst.

关 键 词：光催化 晶型 过氧化氢 自由基抑制剂 

分 类 号：O643.32[理学—物理化学]