摘要
以沉淀-水热法制备了系列CdS/TiO2复合光催化剂,采用紫外-可见光漫反射光谱、X射线衍射、扫描电子显微镜和表面光电压谱等方法对催化剂进行了表征,考察了CdS与TiO2的摩尔比和水热温度对CdS/TiO2复合光催化剂在波长大于400nm的可见光下光催化分解硫化氢制氢性能的影响。表征结果显示,该复合光催化剂表现出CdS与TiO2共有的光学性能,TiO2的吸收边向可见光区移动,扩展了光响应范围;CdS与TiO2得到很好的复合,可有效降低光生电子-空穴对的复合几率。实验结果表明,与纯CdS催化剂相比,CdS/TiO2复合光催化剂的光催化活性明显提高,CdS与TiO2摩尔比为0.5、水热温度为200℃时制得的CdS/TiO2复合光催化剂的性能最佳,产氢速率可达4.96mmol/(h.g)。
CdS/TiO2 composite photocatalyst for decomposition of H2 S to produce H2 under visible light with wavelength more than 400 nm was prepared by hydrothermal method using TiO2-P25, Na2 S and Cd（NO3 ）2 as materials. The catalyst was characterized by means of SEM, XRD, UV-Vis DRS and SPS. Influences of hydrothermal temperature and mole ratio of CdS to TiO2 on performance of CdS/TiO2 composite photocatalysts were studied. The composite photocatalyst exhibited common optical properties of CdS and TiO2, widened the photo response range and inhibited recombination of photogenerated electron-hole pairs. The catalytic activities of CdS/TiO2 composite photocatalysts were higher than that of sole CdS. When mole ratio of CdS to TiO2 was 0.5, and hydrothermal temperature was 200℃ the activity of prepared composite photocatalyst was best and the hydrogen production rate was 4.96 mmol/（ h ·g）.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第4期438-443,共6页
Petrochemical Technology
基金
国家"863"计划项目(2007AA03z337)
黑龙江省杰出青年基金项目(JC200615)
黑龙江省国际合作项目(WC05A13)
哈尔滨市对俄科技合作项目(2006AA4BE053)
关键词
硫化镉
二氧化钛
复合光催化剂
水热合成
硫化氢分解
制氢
cadmium sulfide
titania
composite photocatalyst
hydrothermal method
decomposition of hydrogen sulfide
hydrogen production
