Abstract: A new kind visible-light responsive photocatalyst SxTi1-xN2-yOy was prepared by calcination. The SxTi1-xN2-yOy catalyst was characterized by X-ray photoelectron spectroscopy (XPS)，UV-vis absorption spectra and surface photovoltage spectroscopy (SPS). It was found that S (S6+) substituted some of the lattice titanium atoms in SxTi1-xN2-yOy，and the N was doped in the form of N—C，N—S，N—O and Ti—O bonds. The SxTi1-xN2-yOy was still n-type semiconductor and the light absorption onset of SxTi1-xN2-yOy was shifted to the visible region at 528nm. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity of SxTi1-xN2-yOy was 2.8 times of TiO2.

摘要： 采用焙烧法制备了具有可见光催化活性的光催化剂SxTi1-xN2-yOy。光电子能谱结果表明SxTi1-xN2-yOy中S是以+6价阳离子的形式存在，其掺杂方式是置换了晶格金属离子Ti4+形成阳离子S6+的掺杂；且由于S6+阳离子的存在，导致N1s出现宽化移动现象，N在掺杂过程中形成了N—C、N—S、N—O及Ti—N键。紫外-可见漫反射及表面光电压谱研究结果表明，SxTi1-xN2-yOy吸收带边为528 nm，对应的带-带跃迁能量为2.3 eV，具有明显的可见光催化活性，SxTi1-xN2-yOy仍为n型半导体。模拟太阳光下的光催化降解苯甲酸试验表明，SxTi1-xN2-yOy在可见光下具有很好的光催化活性，是未改性TiO2的2.8倍。