中文摘要：

采用水热法制得了硫和铁共掺杂的纳米TiO2光催化剂（TiO2–S–Fe）。结果表明：TiO2–S–Fe为金红石和锐钛矿的混晶,具有较高的光催化活性,太阳光照射50min和紫外光照射60min时对甲基橙的降解率分别达99%和97%。TiO2–S–Fe具有较高光催化活性的原因可能是：掺杂的硫取代TiO2中的晶格氧形成Ti—S键,使TiO2的带隙能窄化引起对可见光的响应;同时部分掺杂的硫以S6＋形式存在,从而增强了TiO2–S–Fe的表面酸强度,提高了对氧和有机物的吸附;铁掺杂降低了电子和空穴的复合几率。阴阳离子的协同作用提高了TiO2的紫外和可见光催化活性。

英文摘要：

Sulphur and iron co-doped TiO2 photocatalysts （TiO2-S-Fe） were prepared by an in situ hydrothermal method. The results of photocatalytic degradation of methyl orange （MO） demonstrate that the TiO2-S-Fe catalyst prepared at 160℃ for 2 h exhibites the highest photocatalytic activity, the degradation ratios of MO are 99% and 97% under sunlight irradiation for 50 rain and ultraviolet （UV） light irradiation for 60min respectively. X-ray diffraction result indicates that the TiO2-S-Fe is in conformity with an anatase and ruffle mixed phase TiO2 form. The higher UV-visible light photocatalytic activity of co-doped TiO2 is attributed to the partial S atoms occupying O-atom sites in the TiO2 to form Ti-S bonds, which lowers the band gap and caused the absorption edge of TiO2 to be shifted into the lower-energy region. Partial sulfur atoms exist in a six-oxidation state （S^6＋） and then enhance the surface acidity, which is favorable for the adsorption of both oxygen and organic molecules. Doping of Fe^3＋ reduces the recombination of electrons and holes. Both of the above effects are beneficial for improving the photocatalysis of TiO2-S-Fe under UV light and sunlight irradiation.