复合碳纳米管增强纳米Ag<sub>2</sub>CO<sub>3</sub>的可见光催化活性和稳定性

引用本文: 刘素芹, 王松, 戴高鹏, 鲁俊, 刘科. 复合碳纳米管增强纳米Ag₂CO₃的可见光催化活性和稳定性[J]. 物理化学学报, 2014, 30(11): 2121-2126. doi: 10.3866/PKU.WHXB201409191 shu

Citation: LIU Su-Qin, WANG Song, DAI Gao-Peng, LU Jun, LIU Ke. Enhanced Visible-Light Photocatalytic Activity and Stability of Nano-Sized Ag₂CO₃ Combined with Carbon Nanotubes[J]. Acta Physico-Chimica Sinica, 2014, 30(11): 2121-2126. doi: 10.3866/PKU.WHXB201409191 shu

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,

基金项目:
国家自然科学基金(51378183) (51378183)

湖北省自然科学基金(2012FFB1903) (2012FFB1903)

湖北省教育厅项目(Q20132608) (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 (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:

English

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

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 Date: 17 June 2014
Available Online: 30 October 2014
Fund Project:
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

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:

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沈阳化工大学材料科学与工程学院沈阳 110142

复合碳纳米管增强纳米Ag₂CO₃的可见光催化活性和稳定性

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