(1. 深圳職業(yè)技術(shù)學(xué)院 建筑與環(huán)境工程學(xué)院，深圳 518055；
2. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 以銳鈦礦、金紅石及混晶TiO2作光催化劑，研究了H2O2在TiO2可見光催化反應(yīng)過程中的作用機理。結(jié)果表明，H2O2在TiO2表面活性位吸附后可拓寬TiO2的光吸收范圍至可見光區(qū)；通過對反應(yīng)體系的熒光光譜分析顯示，金紅石型TiO2在H2O2存在條件下，經(jīng)可見光激發(fā)可持續(xù)穩(wěn)定產(chǎn)生羥基自由基∙OH。光催化實驗表明，往反應(yīng)體系中加入H2O2后，3種光催化劑均能可見光催化降解苯酚，且金紅石型TiO2顯示出最高的催化活性，反應(yīng)120 min對苯酚的降解率達80%；在TiO2可見光催化反應(yīng)過程中，由銳鈦礦型TiO2經(jīng)一系列復(fù)雜反應(yīng)產(chǎn)生H2O2，生成的H2O2雖只是一中間產(chǎn)物，但對污染物的可見光催化降解起決定性作用。
關(guān)鍵字: H2O2；TiO2；可見光催化
（1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;
2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: The effects of H2O2 on TiO2 visible-light photocatalytic performance were studied, using anatase, rutile and mixing crystalline TiO2 as photocatalysts. The results indicate that the absorption of H2O2 on TiO2 surface to form active species extends the light absorption range of TiO2 into the visible light region. Fluorescence spectrum analysis indicates that the ∙OH radical free from rutile TiO2 surface can be constantly produced under visible light irradiation with addition of H2O2. The photocatalytic tests indicate that phenol can be visible-light photocatalytic degraded with the addition of H2O2 by any one of the three photocatalysts, and the rutile form exhibits the best photocatalytic activity, its degradation ratio can be 80% after 120 min reaction. In the process of TiO2 visible-light photocatalysis, hydrogen peroxide is generated by anatase TiO2 from a series of complex reaction, and the generated hydrogen peroxide is only an intermediate, which is responsible for the degradation of organic pollutants under visible light irradiation.
Key words: hydrogen peroxide; titanium dioxide; visible-light photocatalytic
