S与金属共掺杂TiO2催化剂的制备及其光催化性能

Preparation of S and metal co-doped TiO_2 and their photocatalytic activities

采用溶胶-凝胶法制备S、Mo、Pt、Fe掺杂以及S/Mo、S/Fe、S/Ag共掺杂的TiO2粉末,利用XRD、XPS和UV-Vis等技术对样品进行表征;以1-萘酚-5-硫酸(L-酸)为目标物,考查紫外和可见光源下各催化剂的光催化活性。结果表明:除S/Ag-TiO2外,其余掺杂TiO2均为单一的锐钛矿相,掺杂后催化剂的吸收带边发生明显红移;对10mg/L的L-酸进行降解,在可见光下,S-TiO2光催化活性较好,而在紫外光下,S/Ag-TiO2的光催化活性较好;经XPS分析发现,掺杂元素掺入到TiO2晶体内,使Ti2p结合能减小。S的掺杂不仅使S-TiO2样品的光催化活性增大,同时也提高了金属与S共掺杂样品的光催化活性。

S-, Mo-, Pt-, Fe-doped, and S/Mo, S/Fe, S/Ag co-doped TiO2 nanoparticles were synthesized by sol-gel method. The doped TiO2 photocatalysts were characterized by XRD, XPS and UV-Vis, and the photocatalytic activities were evaluated by photodegradation of 1-naphthol-5-sulfonic acid （L-acid） under ultraviolet and visible light radiation. The results show that the crystal form of all catalysts is single anatase expect S/Ag-TiO2, and the absorption band of all doped-TiO2 is red shift. For photodegradation of 10 mg/L L-acid, photocatalytic activity of S-TiOz is better under the visible light irradiation, while the photocatalytic activity of S/Ag-TiO2 is better under the ultraviolet light irradiation. All doping elements are doped in the crystal of TiO2 and reduce Ti2p binding energy from X-ray photoelectron spectra （XPS）. The sulfur element doping not only increases the photocatalytic activity of the S-TiO2 sample, but also simultaneously enhances the photocatalytic activity of sulfur element and metallic element co-doping the sample.