物理化学学报 >> 2014, Vol. 30 >> Issue (11): 2121-2126.doi: 10.3866/PKU.WHXB201409191

催化和表面科学 上一篇    下一篇

复合碳纳米管增强纳米Ag2CO3的可见光催化活性和稳定性

刘素芹1,2, 王松1, 戴高鹏1,2, 鲁俊1, 刘科2   

  1. 1. 湖北文理学院化学工程与食品科学学院, 湖北 襄阳 441053;
    2. 低维光电材料与器件湖北省重点实验室, 湖北 襄阳 441053
  • 收稿日期:2014-06-17 修回日期:2014-09-19 发布日期:2014-10-30
  • 通讯作者: 戴高鹏 E-mail:dgp2000@126.com
  • 基金资助:

    国家自然科学基金(51378183), 湖北省自然科学基金(2012FFB1903), 湖北省教育厅项目(Q20132608), 襄阳市科技局项目及湖北省低维光电材料与器件重点实验室开放基金(13XKL02013)资助

Enhanced Visible-Light Photocatalytic Activity and Stability of Nano-Sized Ag2CO3 Combined with Carbon Nanotubes

LIU Su-Qin1,2, WANG Song1, DAI Gao-Peng1,2, LU Jun1, LIU Ke2   

  1. 1. Department of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang 441053, Hubei Province, P. R. China;
    2. Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Xiangyang 441053, Hubei Province, P. R. China
  • Received:2014-06-17 Revised:2014-09-19 Published:2014-10-30
  • Contact: DAI Gao-Peng E-mail:dgp2000@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51378183), Natural Science Foundation of Hubei Province, China (2012FFB1903), Research Program of Hubei Province Department of Education, China (Q20132608), Science and Technology Bureau of Xiangyang, China, and Foundation of Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, China (13XKL02013).

摘要:

在二甲基甲酰胺溶液中, 通过简单的沉淀法制备了纳米Ag2CO3和碳纳米管(CNT)的复合物. 用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、扫描电镜(SEM)和紫外-可见(UV-Vis)漫反射光谱(DRS)表征了所制备的Ag2CO3/CNT复合物, 通过在可见光下降解甲基橙(MO)检测了样品的光催化活性. 结果表明, 纳米Ag2CO3颗粒与CNT结合良好. CNT的含量为1.5% (w)的Ag2CO3/1.5% CNT复合物活性最高, 经过60 min 的降解, 甲基橙的降解率达到93%. 与纯相纳米Ag2CO3比较, CNT的加入还提高了Ag2CO3的稳定性, 经过三次循环降解, Ag2CO3/1.5% CNT复合物还能降解81%的甲基橙, 而纳米Ag2CO3只能降解59.5%的甲基橙. 其活性和稳定性提高的原因是由于CNT的高导电性, 它不仅促进了电子-空穴对的分离, 还能快速转移产生的光生电子.

关键词: Ag2CO3/CNT复合物, 光催化, 可见光, 稳定性

Abstract:

Nano-sized Ag2CO3 and carbon nanotube (CNT) composites were fabricated by a facile chemical precipitation approach in N,N-dimethylformamide (DMF) solvent. The as-prepared Ag2CO3/CNT samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and ultra violet-visible (UV-Vis) diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange (MO) under visible light irradiation. The results showed that the nano-sizedAg2CO3 particles and CNTs were well combined. The Ag2CO3/CNT composite with CNT content of 1.5%(w) exhibited optimal photocatalytic activity under visible light. Ninetythree percent of the MO was removed by the Ag2CO3/CNT composite within 60 min. For the Ag2CO3/CNT composites, we found that the incorporation of CNT improved the structural stability of Ag2CO3 compared with Ag2CO3. After three cycles, 81% of the MO was decomposed by the Ag2CO3/CNT composite with CNT content of 1.5% (w), but only 59.5% of the MO could be removed by Ag2CO3. The improvements in the activity and stability are attributed to the conductive structure supported by CNTs, which favors electron-hole separation and the removal of photogenerated electrons from the decorated Ag2CO3.

Key words: Ag2CO3/CNT composite, Photocatalysis, Visible light, Stability

MSC2000: 

  • O644