CdS/r-TiO_2复合催化剂的制备及其在光催化分解硫化氢制氢中的应用  

Preparation of CdS/r-TiO_2 Photocatalysts and Its Photocatalytic H_2S Splitting Performance in Aqueous Solution

作　　者：朱桂莲 范弢 高晓晨[1] Zhu Guilian;Fan Tao;Gao Xiaochen(State Key Laboratory of Green Chemical and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China)

机构地区：[1]中国石油化工股份有限公司上海石油化工研究院绿色化工与工业催化国家重点实验室,上海201208

出　　处：《化学工业与工程》2018年第4期10-16,共7页Chemical Industry and Engineering

基　　金：国家重点研发计划"材料基因工程关键技术与支撑平台"专项"绿色高效化工催化新材料的高通量开发和应用"项目(2017YFB0702900)

摘　　要：以钛酸四丁酯,乙酸镉为前驱体,以Na BH4为还原剂,采用溶胶凝胶辅助溶剂热法制备了负载CdS的还原TiO_2光催化剂(CdS/r-TiO_2),并运用扫描电子显微镜、X射线衍射仪、紫外可见漫反射吸收光谱仪和X射线光电子能谱仪等方法探讨了CdS负载量及TiO_2还原对光催化分解H2S制氢的影响。结果表明:负载CdS可使催化剂的光响应区间拓展至可见光区,Na BH4还原可进一步增加样品对可见及红外光的吸收性能。负载CdS增加了催化剂分解H2S制氢的反应活性位点,并有利于光生载流子的分离传输,使材料的光催化活性大幅增加。当CdS负载量为5%时,CdS/rTiO_2在全光谱光照下的产氢速率达2.4 mmol·h-1·g-1。A CdS loaded reduced-TiO2 photocatalyst was successfully prepared through a sol-gel assisted solvothermal method, using tetrabutyl-titanate/cadmium acetate as raw materials and sodium borohydride as reductant. The properties of the composite photcatalysts were characterized by scanning electron mi- croscopy, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, and X-ray photo-electric spectrom- etry. The photocatalytic H2S splitting performance was evaluated by the H2 production in a H2S saturated sodium hydroxide solution irradiated by a 300 W xenon lamp. The results indicate that CdS loading and reduction by NaHB4 could efficiently increase the light absorption of TiO2 in visible and near-infrared re- gion. Additionally, CdS loaded on TiO2 provided more reaction site for H2S splitting and contributed greatly to the separation of photoexcited electrons and holes, which substantially enhance the photocata- lytic property. The HE production rate of the 5% CdS loaded r-TiO2 under full-spectrum light irradiation is 2.4 mmol·h^-1·g^-1, which is 5.5 times higher than that of the pristine TiO2.

关 键 词：二氧化钛 硫化镉 硫化氢 产氢 光催化 

分 类 号：TQ036[化学工程]