表面Cu2O纳米颗粒修饰高效促进γ-Bi2MoO6的可见光催化活性

doi:10.3866/PKU.WHXB201301151

物理化学学报 >> 2013, Vol. 29 >> Issue (04): 813-820.doi: 10.3866/PKU.WHXB201301151

表面Cu₂O纳米颗粒修饰高效促进γ-Bi₂MoO₆的可见光催化活性

杨自嵘¹, 韩玉琦¹, 王芳¹, 刘倩¹, 张扬¹, 敏世雄^1,2

1 河西学院化学化工学院, 甘肃省高校河西走廊特色资源利用省级重点实验室, 甘肃张掖 734000;
2 中国科学院兰州化学物理研究所, 羰基合成和选择氧化重点实验室, 甘肃兰州, 730000

收稿日期:2012-10-31 修回日期:2013-01-14 发布日期:2013-03-25
通讯作者: 韩玉琦, 王芳 E-mail:hanyq@hxu.edu.cn; wangfang987@126.com
基金资助:
国家自然科学基金(51263008), 河西学院校长基金(XZ2010), 河西学院大学生科技创新项目和甘肃省高校河西走廊特色资源利用省级重点实验室面上项目(XZ1012)资助

Significantly Improved Visible Light Photocatalytic Activity of γ-Bi₂MoO₆ by Surface Modification with Cu₂O Nanoparticles

YANG Zi-Rong¹, HAN Yu-Qi¹, WANG Fang¹, LIU Qian¹, ZHANG Yang¹, MIN Shi- Xiong^1,2

1 Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities , College of Chemistry and Chemical Engineering , Hexi University, Zhangye 734000 , Gansu Province, P. R. China;
2 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China

Received:2012-10-31 Revised:2013-01-14 Published:2013-03-25
Supported by:
The project was supported by the National Natural Science Foundation of China (51263008), Principal Fund of Hexi University, China (XZ2010), University Science and Technology Innovation Project of Hexi University, China, and General Projects of Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, China (XZ1012).

摘要/Abstract

摘要：

采用水热法在γ-Bi₂MoO₆光催化剂表面修饰了纳米级Cu₂O, 得到了具有高效可见光响应的复合光催化材料, 并利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、选区电子衍射(SAED)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis-DRS)等技术对其相结构、微观形貌和光吸收性能进行了表征. 在可见光条件下(λ>400 nm)考察了Cu₂O表面修饰对γ-Bi₂MoO₆光催化降解亚甲基蓝(MB)性能的促进作用. 结果表明, 纳米级Cu₂O(~10 nm)颗粒均匀地修饰于γ-Bi₂MoO₆的表面, 使γ-Bi₂MoO₆的可见光吸收带发生明显红移, 且吸收强度大幅提高, 增强了复合材料光生电子-空穴对的分离效率, 从而使复合材料表现出较高的光催化活性. 当Cu₂O的表面修饰量为1.5%(w)时, 复合光催化剂降解MB的活性与纯γ-Bi₂MoO₆相比提高了6.4倍.

关键词: Cu₂O, γ-Bi₂MoO₆, 表面修饰, 可见光, 亚甲基蓝, 降解

Abstract:

Nanosized cuprous oxide (Cu₂O) was used to modify the surface of γ-Bi₂MoO₆, resulting in highly efficient visible-light-responsive Cu₂O/γ-Bi₂MoO₆ composite photocatalysts. The obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrum (UV-Vis-DRS) to determine their phase structures, micromorphologies, and light absorption properties. The important role of surface-modified Cu₂O in improving the photocatalytic activity of γ-Bi₂MoO₆ under visible light irradiation was studied using the degradation of methylene blue (MB). The results showed that Cu₂O nanoparticles with average size of ~10 nm modified the surface of the γ-Bi₂MoO₆. The nanoparticles delivered both an obvious red-shift of absorption threshold and intensity of the γ-Bi₂MoO₆, as well as enhanced separation efficiency of photogenerated carriers, thereby leading to significant enhancement in photocatalytic activity. When the amount of Cu₂O was 1.5%, the photocatalytic activity of the Cu₂O/γ-Bi₂MoO₆ composite photocatalyst was 6.4 times higher than that of pristine γ-Bi₂MoO₆.

Key words: Cu₂O, γ-Bi₂MoO₆, Surface modification, Visible light, Methylene blue, Degradation

杨自嵘, 韩玉琦, 王芳, 刘倩, 张扬, 敏世雄. 表面Cu₂O纳米颗粒修饰高效促进γ-Bi₂MoO₆的可见光催化活性[J]. 物理化学学报, 2013, 29(04), 813-820. doi: 10.3866/PKU.WHXB201301151

YANG Zi-Rong, HAN Yu-Qi, WANG Fang, LIU Qian, ZHANG Yang, MIN Shi- Xiong. Significantly Improved Visible Light Photocatalytic Activity of γ-Bi₂MoO₆ by Surface Modification with Cu₂O Nanoparticles[J]. Acta Phys. -Chim. Sin. 2013, 29(04), 813-820. doi: 10.3866/PKU.WHXB201301151

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201301151

https://www.whxb.pku.edu.cn/CN/Y2013/V29/I04/813

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表面Cu₂O纳米颗粒修饰高效促进γ-Bi₂MoO₆的可见光催化活性

Significantly Improved Visible Light Photocatalytic Activity of γ-Bi₂MoO₆ by Surface Modification with Cu₂O Nanoparticles

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