Pd修饰对Cd0.8Zn0.2S/SiO2光催化甘油水溶液制氢性能的影响

徐瑾; 王希涛; 樊灿灿; 乔婧

Pd修饰对Cd_0.8Zn_0.2S/SiO₂光催化甘油水溶液制氢性能的影响

1.
天津理工大学, 管理学院, 天津 300384;
2.
天津大学, 化工学院, 天津 300072;
3.
天津市环境保护科学研究院, 天津 300191

基金项目: 国家自然科学基金(20806059,21276190)。

详细信息

通讯作者:
王希涛,E-mail:wangxt@tju.edu.cn;Tel:022-27402972。

中图分类号: O643
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- 被引次数: 0
出版历程
- 收稿日期: 2012-08-06
- 修回日期: 2012-10-27
- 刊出日期: 2013-03-30

Effect of Pd-modification on photocatalytic H₂ evolution over Cd_0.8Zn_0.2S/SiO₂ from glycerol solution

1.
Institute of Management, Tianjin University of Technology, Tianjin 300384, China;
2.
College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3.
Tianjin Academy of Environmental Sciences, Tianjin 300191, China

摘要

摘要: 用等体积浸渍法制备了不同Pd负载量的Pd/Cd_0.8Zn_0.2S/SiO₂光催化材料,采用XRD、H₂-TPR、XPS、UV-vis DRS和光催化反应评价等方法对光催化材料的表面结构、光吸收性能以及光催化甘油水溶液制氢反应性能进行了考察。研究结果表明,ZnS与CdS在SiO₂表面形成了Cd_0.8Zn_0.2S固溶体,金属Pd负载未对固溶体Cd_0.8Zn_0.2S/SiO₂的结构造成影响;金属Pd修饰明显地提高了原固溶体的光响应性能,拓展了其吸光域,增强了吸光效率。金属Pd修饰后,Cd_0.8Zn_0.2S/SiO₂的光解甘油水溶液产氢速率显著提高,Pd负载量为0.5%的Pd/Cd_0.8Zn_0.2S/SiO₂具有最佳的光催化甘油水溶液制氢性能,其在紫外光照射下的氢气生成速率为831 μmol/h,较未负载时提高了近四倍;模拟太阳光下为153 μmol/h,较未负载时提高了近两倍。
- Pd修饰 /
- Cd_0.8Zn_0.2S固溶体 /
- 光催化 /
- 甘油水溶液 /
- 制氢
Abstract: A series of Pd/Cd_0.8Zn_0.2S/SiO₂ photocatalysts were prepared by incipient wet impregnation. The catalysts were characterized by XRD, H₂-TPR, XPS, and UV-vis DRS and used in the photocatalytic evolution of H₂ from glycerol and water mixture; the effects of Pd loading on the surface structure, photo absorption and H₂ evolution rate were investigated. The results showed that the chemical interaction between ZnS and CdS results in the formation of Cd_0.8Zn_0.2S solid solution on the surface of SiO₂; after the modification with Pd, the light absorption region of Cd_0.8Zn_0.2S/SiO₂ is expanded and the photo absorption efficiency is enhanced obviously. The loading of Pd exhibits significant influence on the rate of photocatalytic H₂ evolution; over 0.5%Pd/Cd_0.8Zn_0.2S/SiO₂ with a Pd loading of 0.5%, the maximum hydrogen production rates under UV light irradiation and under solar-simulated light irradiation reach 831 μmol·h^-1 and 153 μmol·h^-1, respectively, which are almost 4 times and 2 times higher than those obtained over unmodified Cd_0.8Zn_0.2S/SiO₂ under UV and solar-simulated light irradiation, respectively. The superior photocatalytic performance of Pd/Cd_0.8Zn_0.2S/SiO₂ can be partly related with the improvement of photo absorption, the enhancement in chemisorption and activation of H₂O and the increase in separation efficiency of photo induced electron-hole arising from the Pd modification.
- Pd-modified /
- Cd_0.8Zn_0.2S solid solution /
- photocatalysis /
- glycerol solution /
- H₂ production

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