中文摘要：

采用沉淀-浸渍法合成了一种新型La^3＋和S共掺杂TiO2纳米复合光催化剂。通过紫外．可见（UV-Vis）漫反射、X射线衍射（XRD）和透射电子显微镜（TEM）等手段对其物相组成、晶粒尺寸、结晶形态和吸光性能进行了表征。以活性艳蓝198染料溶液为模拟废水，对La^3＋／S/TiO纳米复合光催化剂的活性进行了评价。相对于单一的TiO2，S掺杂的TiO2和La^3＋掺杂的TiO2光催化剂，La^3＋／S/TiO2纳米复合光催化荆颗粒的粒径更小，光的吸收边发生了更大程度的红移。在波长λ〉400nm的可见光光照下，具有最高的光催化活性。

英文摘要：

A novel La^3＋/S/TiO2 nanocomposition photocatalyst was prepared by precipitation-doping method. UV-Vis diffuse reflection spectra （DRS）, X-ray diffraction （XRD） and transmission electron microsco- py （TEM） were employed to characterize the optical characteristics, crystal and particle size and the phase composition of the sample. The photocatalytic activities of La^3＋/S/TiO2 were evaluated using the photodegradation of reactive blue 198 as a probe reaction under the irradiation of xenon light. Compared with pure TiO2, S-doped TiO2 and La^3＋ -doped TiO2, the sizes of La^3＋/S/TiO2 are smaller, and the absorption edge shifts remarkably toward longer wavelength. Under the irradiation of visible light （A 〉 400 nm）, La^3＋/S/TiO2 have the maximum photocatalytic activity.