物理化学学报 >> 2010, Vol. 26 >> Issue (10): 2726-2732.doi: 10.3866/PKU.WHXB20101023

催化和表面结构 上一篇    下一篇

复合半导体光催化剂p-CoO/n-CdS 的制备、表征及光催化性能

杜欢1, 王晟2, 刘恋恋1, 刘忠祥1, 李振1, 卢南1, 刘福生1   

  1. 1. 南京林业大学理学院化学与材料科学系, 南京 210037;
    2. 南京工业大学化学化工学院,南京 210009
  • 收稿日期:2010-05-17 修回日期:2010-06-09 发布日期:2010-09-27
  • 通讯作者: 刘福生 E-mail:lfs039270@163.com
  • 基金资助:

    国家自然科学基金(50876047)资助项目

Preparation, Characterization and Photocatalytic Property of p-CoO/n-CdS Compound Semiconductor Photocatalyst

DU Huan1, WANG Sheng2, LIU Lian-Lian1, LIU Zhong-Xiang1, LI Zhen1, LU Nan1, LIU Fu-Sheng1   

  1. 1. Department of Chemistry and Materials Science, College of Science, Nanjing Forestry University, Nanjing 210037, P. R. China;
    2. College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China
  • Received:2010-05-17 Revised:2010-06-09 Published:2010-09-27
  • Contact: LIU Fu-Sheng E-mail:lfs039270@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50876047).

摘要:

以醋酸镉、十二硫醇、硬脂酸和醋酸钴等为原料, 采用新方法制备了CdS 和一系列p-CoO/n-CdS 复合半导体光催化剂. 用X 射线衍射(XRD) 、扫描电子显微镜(SEM) 、透射电子显微镜(TEM) 、N2 吸附-脱附和紫外-可见漫反射光谱(UV-Vis DRS) 等对产物进行了表征. 结果表明, p-CoO/n-CdS 复合半导体中, CoO 粒子紧密结合在CdS 颗粒上, CdS 的颗粒粒径在100 nm 左右, 为六方纤锌矿晶型, CoO 的颗粒粒径在10 nm 左右, 颗粒粒径分布均匀. p-CoO/n-CdS 的UV-Vis DRS 分析结果表明, 在400-550 nm 范围内都有一强吸收带, 属于CdS 在可见光区的特征吸收. 用光催化降解甲基橙测试了光催化性能, 结果表明, p-CoO/n-CdS 光催化活性是CdS 光催化活性的2.2 倍左右. 光腐蚀测试结果表明, CdS 的光腐蚀速率是p-CoO/n-CdS 中CdS 光腐蚀速率的2 倍以上, 说明CoO 与CdS 复合对CdS 的光腐蚀具有明显的抑制作用.

关键词: 光催化, p-n 复合半导体, 氧化钴, 硫化镉, 表征

Abstract:

The photocatalysts CdS and p-n coupled semiconductor photocatalysts CoO/CdS(p-CoO/n-CdS) were prepared using cadmium acetate, lauryl mercaptan, cobalt acetate, and stearic acid by a new method. The structural and optical properties of CdS and p-CoO/n-CdS were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM),N2 adsorption -desorption, and ultraviolet -visible diffuse reflection spectroscopy (UV-Vis DRS). The results showed that the particles of CoO compactly connected with the particles of CdS in the p-CoO/n-CdS. The particle size of CdS was about 100 nm and the crystalloid of CdS was hexagon spiauterite. The particle size of CoO was about 10 nm, and the distribution of particles size was uniform. The results of UV-Vis DRS showed that the nano-CdS particles could absorb the visible light at wavelengths between 400 and 550 nm which is characteristic absorption of CdS in the visible region. The photocatalytic activity of the photocatalyst was evaluated by photocatalytic degradation of methyl orange (MO). The results showed that the photocatalytic activity of p-CoO/n-CdS was much higher, which was 2.2 times than that of CdS on the photocatalytic degradation of methyl orange. The results of photocorrosion test showed that the photocorrosion rate of CdS was two or more times than that of p-CoO/n-CdS, which indicated that CoO coupled with CdS could effectively restrain the photocorrosion of CdS.

Key words: Photocatalysis, p-n coupled semiconductor, CoO, CdS, Characterization

MSC2000: 

  • O643