二氧化硫脲为硫源制备硫掺杂二氧化钛及其光催化活性

PREPARATION AND PHOTOCATALYTIC ACTIVITY OF SULFUR-DOPED TITANIA USING THIOUREA DIOXIDE AS SULFUR SOURCE

以钛酸四丁酯为TiO2的前驱物,二氧化硫脲为掺杂硫的源物质,采用溶胶-凝胶法制备了掺硫改性的TiO2光催化剂。采用XRD对制备的掺硫二氧化钛结构进行了表征,探讨了溶胶-凝胶制备工艺、硫掺杂量及催化剂煅烧温度对该催化剂光催化活性的影响。结果表明,掺硫改性的TiO2经600℃煅烧后光催化活性有了明显提高,且硫的掺杂有一个最佳值,即二氧化硫脲的掺杂质量百分数为4%。经掺硫改性后的TiO2在可见光区具备更强的光催化活性,在波长不低于400nm的可见光作用下,对亚甲基蓝的4 h降解率最高可达89.5%。

Using tetrabutyl titanate as precursor and thiourea dioxide as sulfur source,sulfur-doped titania photocatalyst was prepared by sol-gel method.The crystal structure of the photocatalyst was characterized by XRD.The influences of sol-gel processing technology,sulfur doping amounts and calcined temperatures on the photocatalytic activities under visible-light irradiation were investigated.The results indicated that the photocatalytic activity of the sulfur-doped TiO2 calcined at 600°C was improved significantly,and there existed an optimized sulfur doping amount,i.e.,the content of thiourea dioxide was 4 wt%.The sulfur-doped TiO2 had stronger photocatalytic activity for degradation of methylence blue under visible-light wavelength above 400 nm,and the highest methylence blue degradation rate reached 89.5% after 4 h reaction.