Zhou Minghua, Yu Jiaguo
Yunyang Medical College, Shiyan 442000, Hubei, PR China.
J Hazard Mater. 2008 Apr 15;152(3):1229-36. doi: 10.1016/j.jhazmat.2007.07.113. Epub 2007 Aug 7.
A simple method for preparing highly daylight-induced photoactive nanocrystalline C,N,S-tridoped TiO2 powders was developed by a solid-phase reaction. The as-prepared TiO2 powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra, N2 adsorption-desorption measurements and transmission electron microscopy (TEM). The photocatalytic activity was evaluated by the photocatalytic oxidation of formaldehyde under daylight irradiation in air. The results show that daylight-induced photocatalytic activities of the as-prepared TiO2 powders were improved by C,N,S-tridoping. The C,N,S-tridoped TiO2 powders exhibited stronger absorption in the near UV and visible-light region with red shift in the band-gap transition. When the molar ratio of CS(NH2)2 to xerogel TiO2 powders (prepared by hydrolysis of Ti(OC4H9)4 in distilled water) (R) was kept in 3, the daylight-induced photocatalytic activities of the as-prepared C,N,S-tridoped TiO2 powders were about more than six times greater than that of Degussa P25 and un-doped TiO2 powders. The high activities of the C,N,S-tridoped TiO2 can be attributed to the results of the synergetic effects of strong absorption in the near UV and visible-light region, red shift in adsorption edge and two phase structures of un-doped TiO2 and C,N,S-tridoped TiO2.
通过固相反应开发了一种制备高日光诱导光活性的碳、氮、硫三掺杂纳米晶二氧化钛粉末的简单方法。采用X射线衍射（XRD）、X射线光电子能谱（XPS）、紫外可见漫反射光谱、N₂吸附-脱附测量和透射电子显微镜（TEM）对所制备的二氧化钛粉末进行了表征。通过在空气中日光照射下对甲醛的光催化氧化来评估光催化活性。结果表明，碳、氮、硫三掺杂提高了所制备二氧化钛粉末的日光诱导光催化活性。碳、氮、硫三掺杂的二氧化钛粉末在近紫外和可见光区域表现出更强的吸收，且带隙跃迁发生红移。当硫脲与干凝胶二氧化钛粉末（由四丁氧基钛在蒸馏水中水解制备）的摩尔比（R）保持为3时，所制备的碳、氮、硫三掺杂二氧化钛粉末的日光诱导光催化活性比德固赛P25和未掺杂的二氧化钛粉末高出约六倍以上。碳、氮、硫三掺杂二氧化钛的高活性可归因于其在近紫外和可见光区域的强吸收、吸附边的红移以及未掺杂二氧化钛和碳、氮、硫三掺杂二氧化钛的两相结构协同作用的结果。
