CdS/<em>r</em>-TiO<sub>2</sub>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

摘要

以钛酸四丁酯，乙酸镉为前驱体，以NaBH₄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TiO₂光催化剂（CdS/r-TiO₂），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TiO₂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，NaBH₄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/r-TiO₂在全光谱光照下的产氢速率达2.4 mmol·h^-1·g^-1。

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	朱桂莲
	范弢
	高晓晨

关键词：二氧化钛；硫化镉；硫化氢；产氢；光催化

Abstract：

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 microscopy, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, and X-ray photo-electric spectrometry. 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 region. 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 photocatalytic property. The H₂ 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.

Keywords： titunium dioxide； cadmium sulfide； hydrogen sulfide； H₂ production； photocatalysis

Received 2018-04-24;

Fund:

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）。

Corresponding Authors: 高晓晨,E-mail:gaoxch.sshy@sinopec.com Email: gaoxch.sshy@sinopec.com

About author: 朱桂莲(1989-),女,博士研究生,现从事光催化材料研究。

引用本文:

朱桂莲, 范弢, 高晓晨.CdS/r-TiO₂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[J]. 化学工业与工程, 2018,35(4): 10-16

Zhu Guilian, Fan Tao, Gao Xiaochen.Preparation of CdS/r-TiO₂ Photocatalysts and Its Photocatalytic H₂S Splitting Performance in Aqueous Solution[J]. Chemcial Industry and Engineering, 2018,35(4): 10-16

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