金,氧化亚铜异质球的制备及其可见光催化性能.pdf

物理化学学报( Wuli Huaxue Xuebao)
August
Acta Phys. -Chim. Sin. 2013, 29(8), 1819-1826
1819
Article
doi:10.3866/PKU.WHXB201305281
www.whxb.pku.edu.cn
金/化亚铜异质球的制备及其可见光催化性能
商旸陈阳施湛斌张东风郭林”
北京航空航天大学化学与环境学院,北京100191)
摘要:使用レ-半胱氨酸作为连接剂,利用硼氢化钠原位还原预先吸附在介孔氧化亚铜表面的氯金酸根离子,
得到了AuCu2O异质结构.应用X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)X射线光电子能谱
(XPS)、紫外-可见( Jv-vis)光谱和N2物理吸附等手段对催化剂进行表征,并以A>400nm的可见光作为光源,评
价了该催化剂光催化降解亚甲基蓝(MB)的活性.实验结果表明,直径为4nm的金颗粒完好地负载在介孔氧化
亚铜的表面,并且介孔氧化亚铜的细微结构与孔径均未发生变化.研究表明,以乙醇作为反应溶剂有效抑制了
AuCl与CuO之间的氧化还原反应,从而有利于氧化亚铜介孔结构的保持及金颗粒的原位还原.光催化降解亚
甲基蓝的结果表明,Au/Cu2O异质结构的光催化活性比纯氧化亚铜光催化活性有明显提高.推测其光催化性能
提高的主要原困如下:一方画,金颗粒良好的导电性有利于氧化亚铜表面电子的快速转移,实现电子-空穴分
离;另-方面,金颗粒可能存在的表面等离子共振现象加速了光生电子的产生.
关键词:光催化剂;电子-空穴分离;氧化亚铜;金;异质结
中图分类号:O643
Synthesis and Visible Light Photocatalytic Activities of Au/Cu o
Heterogeneous Nanospheres
SHANG Yang
CHEN Yang SHI Zhan-bin ZHANG Dong-feng
GUO Lin
School of Chemistry and Environment, Beihang University, Beijing 100191, P R. China
Abstract: Au/Cu O heterogeneous spheres(HGS ) were prepared by in situ reduction of preadsorbed
Aucl on the surface of Cu O mesoporous spheres(MPS) linked by L-cysteine. The resulting products
were characterized by powderx-ray diffraction (RD ) canin electron microscopy(SEM), transmission
electron microscopy (TEM), X-ray photoelectron spectroscopy XPS), Uv-vis diffuse reflectance
spectroscopy(DR), and Na physical adsorption. The photocatalytic activity of the samples was evaluated
of methylene blue(MB )under visible light(>400 nm)irradiation. The
experimental results revealed that the Cu O MPS kept their mesoporous structure after loading with Au
and small Au nanopaticles(P th a ameer of 4 nm were identified on the surface of the MPSS. N
hysical adsorption analysis howe that the pore size distributions of Cu O MPSS were unchanged after
loading with Au NPS Using ethanol as a solvent retarded the redox reaction between Auca and Cu2o
avoiding damage to the mesoporus strucures The A/Cu2o HGSS exhibited higher visible-light
photocatalytic activity for the degradation of methylene blue than the pure Cuo MPSS. The enhanced
hotocatalytic eficiency of the A/Cu O HGSS was at ibuted to rapid charge transfer from Cu2o to the
loaded Au NPS as well as the surface plasmon resonance of Au Nps
Received: February 6, 2013; Revised: May 28, 2013; Published on Web: May 28, 2013
Corresponding authors. ZHANG Dong-feng, Email: dfzhang(@buaa. edu. n; Tel: + 86-10-82338492. GUO Lin, Email: guolin@buaa. du. c
Tel:+86-10-82338162.
The project was supported by the National Key Basic Research Program of China(73)(2010CB934700), National Natural Science Foundation of
China(2117301 5), Fundamental Research Funds for the Central Universi, Chinawf-11-03-q-085) and Innovation Foundation of BUAA for
国家重点基础研究发展规划项目(973)(2010CB9314700,国家自然科学基金(21173015),中央高校基本科研基金(YWrF-1103-Q-085)及北京
航空航天大学博士研究生创新基金资助
C Editorial office of Acta Physico-chimica Sinica