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以硫代乙酰胺为硫源,采用一步溶剂热合成S掺杂TiO_2催化剂,以水中六价铬为污染物模型,考察S-TiO_2在可见光下的催化活性.采用X-射线光电子能谱、X-射线粉末衍射、紫外-可见吸收光谱、傅里叶变换红外光谱、荧光发射光谱和N2吸附-脱附等技术对S-TiO_2进行表征.结果表明,硫原子以S6+形式取代TiO_2晶格中的Ti~(4+),形成Ti-O-S键;S-TiO_2对六价铬的可见光还原率均高于TiO_2.适量硫掺杂可降低催化剂的荧光发射光谱强度,提高了光生载流子的利用率,使得S-TiO_2的光催化活性增强.
In this paper, S-doped TiO_2 catalyst was synthesized by one-step solvothermal method using thioacetamide as sulfur source and hexavalent chromium as pollutant in water to investigate the catalytic activity of S-TiO_2 in visible light.Using X-ray photoelectron spectroscopy, X S-TiO 2 was characterized by X-ray powder diffraction, UV-Vis absorption, Fourier transform infrared spectroscopy, fluorescence emission spectroscopy and N2 adsorption-desorption. The results showed that the sulfur atom substituted S6 + Ti ~ (4+) to form Ti-OS bond. The visible light reduction rate of S-TiO_2 to hexavalent chromium is higher than that of TiO_2. Sulfur doping can reduce the fluorescence emission intensity of the catalyst and increase the utilization of photo-generated carriers Rate, making S-TiO 2 photocatalytic activity increased.