可见光下改性纳米TiO_2催化降解废水污染物的研究进展

Research Progress on the Investigation of Degradation of Organic Pollutants in Wastewater by Modified Nanometer TiO_2 under Visible Light

通常TiO2可降解有机污染物,其最活泼晶型为锐钛矿相,但它却有较高带隙能,因此只能被紫外光激发;近年来,大量研究人员致力于对TiO2进行改性使其吸收波谱向可见光波长方向移动的研究,取得一定成效。文章综述了拓宽光谱响应光催化材料的类型、机理以及掺杂物用量、载体等对改性纳米TiO2可见光吸收范围及光催化剂活性的影响,展望了可见光响应光催化材料在降解废水污染物研究中的应用。

Many pollutants can be degraded by TiO2 and the most reactive form is anatase; however, TiO2 has a high-energy band gap and be excited only by UV light. Nowadays, the methods of moving the absorption spectrum of TiO2 into solar spectrum are investigated. The work introduced the types of catalysts, mechanism and dosage of modified materials, supports and so on which could extend corresponding spectrum and affect absorb edge of photocatalyst under visible light. The application of photocatalyst under visible light in degradation of organic pollutants in wastewater were also stated.