染料敏化TiO_(2)光催化剂的研究进展

Research development of dye-sensitized technology on TiO_(2) photocatalyst

TiO_(2)光催化剂因其耐用性、低成本、低毒性、超亲水性以及出色的化学稳定性,广泛应用于水中有机污染物的降解。但TiO_(2)的带隙(3.2 eV)较宽,导致TiO_(2)的光生电子-空穴对易复合,无法充分利用可见光,限制了其实际应用。染料敏化可将TiO_(2)的光响应范围扩展到可见光区域,提高其光催化活性。综述了染料敏化TiO_(2)光催化剂的原理、染料敏化剂的分类、不同染料敏化剂的应用现状及效果,以期为染料敏化在TiO_(2)光催化剂中的应用提供参考。

TiO_(2) photocatalyst is widely used in the degradation of organic pollutants in water due to its durability,low cost,low toxicity,super hydrophilicity and excellent chemical stability.However,the wide band gap(3.2 eV)of TiO_(2) leads to the easy recombination of the photogenerated electron-hole pairs and cannot make full use of visible light,which limits its practical application.Dye sensitization can extend the light response range of TiO_(2) to visible light region and improve its photocatalytic activity.The principle of dye-sensitized TiO_(2) photocatalyst,the classification of dye sensitizers,the application status and effects of different dye sensitizers are reviewed,in order to provide a reference for the application of dye-sensitized TiO_(2) photocatalyst.