(1. 深圳職業(yè)技術(shù)學(xué)院 深圳市工業(yè)節(jié)水與城市污水資源化技術(shù)重點(diǎn)實(shí)驗(yàn)室，深圳 518055；
2. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 以活性艷紅X-3B及苯酚作模型污染物，研究催化劑晶型(銳鈦礦和金紅石)及H2O2對(duì)TiO2可見光催化性能的影響，并研究Fe3+在這一反應(yīng)體系中的協(xié)同效應(yīng)。結(jié)果表明：在H2O2存在條件下，銳鈦礦和金紅石TiO2均能可見光催化降解活性艷紅X-3B，且TOC的去除率達(dá)65%，反應(yīng)并不限于發(fā)色基團(tuán)的破壞，但當(dāng)TiO2的吸附點(diǎn)位吸附CO32−達(dá)到飽和后，則對(duì)活性艷紅X-3B基本無(wú)降解效果；TiO2能可見光催化H2O2降解苯酚，金紅石TiO2顯示出較銳鈦礦TiO2更高的催化活性，反應(yīng)120 min后，對(duì)苯酚的降解率達(dá)80%，且反應(yīng)體系生成的環(huán)狀中間產(chǎn)物的濃度明顯較銳鈦礦TiO2的高；以Fe3+協(xié)同TiO2可見光催化H2O2降解苯酚時(shí)，反應(yīng)效率顯著加快，經(jīng)20 min反應(yīng)，對(duì)苯酚的降解率可達(dá)100%，而金紅石TiO2顯示更為明顯的協(xié)同效應(yīng)。
關(guān)鍵字: 可見光催化；二氧化鈦；過(guò)氧化氫；協(xié)同效應(yīng)；活性艷紅X-3B；苯酚
TiO2 under visible irradiation
（1. Shenzhen Key Laboratory of Industrial Water Conservation and Municipal Wastewater Resources Technology,
Shenzhen Polytechnic, Shenzhen 518055, China;
2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The effects of crystalline structure (anatase and rutile) and H2O2 on TiO2 visible-light photocatalysis were studied, and the synergistic effect of Fe3+ in the reaction system was also studied using the reactive red X-3B and phenol as model pollutants. The results indicate that reactive brilliant red X-3B can be photocatalytic degradated by anatase or rutile TiO2 under visible-irradiation with H2O2 addition, the TOC removal rate can reach 65%, and the degradation process is not limited to the broke down of chromophore groups, however, when the surface sites of TiO2 photocatalyst (anatase or rutile) is preeminently occupied by CO32−, the photodecomposition of reactive brilliant red X-3B can not be processed. The phenol can be degradated with H2O2 catalyzed by TiO2 visible-light photocatalysis, the rutile form exhibit a better photocatalytic activity, its degradation rate can reach 80% after 120 min reaction, and the concentration of the ring intermediates detected during phenol decomposition is evidently higher when using rutile TiO2 as photocatalyst. The snergistic degradation of phenol with H2O2 photo-catalyzed by TiO2 and Fe3+ is evidently fast, the degradation rate of phenol can reach 100% after 20 min reaction, and rutile TiO2 show more evident synergistic effect.
Key words: visible light photocatalysis; titanium dioxide; hydrogen peroxide; synergistic effect; reactive brilliant red X-3B; phenol
