物理化学学报 >> 2015, Vol. 31 >> Issue (6): 1145-1152.doi: 10.3866/PKU.WHXB201504015

催化和表面科学 上一篇    下一篇

g-C3N4/BiVO4复合催化剂的制备及应用于光催化还原CO2的性能

黄艳1,2,傅敏1, 贺涛2   

  1. 1 重庆工商大学环境与生物工程学院, 催化与功能有机分子重庆市重点实验室, 重庆400067;
    2 国家纳米科学中心, 中国科学院纳米系统与多级次制造重点实验室, 北京100190
  • 收稿日期:2015-02-09 修回日期:2015-04-01 发布日期:2015-06-05
  • 通讯作者: 傅敏, 贺涛 E-mail:fumin1022@126.com;het@nanoctr.cn
  • 基金资助:

    科技部国际合作资助项目(2015DFG62610)

Synthesis of g-C3N4/BiVO4 Nanocomposite Photocatalyst and Its Application in Photocatalytic Reduction of CO2

HUANG Yan1,2, FU Min1, HE Tao2   

  1. 1 Chongqing Key Laboratory of Catalysis and Functional Organic Molecules, College of Environmental and Biological Engineering, Chongqing Technology and Business University, Chongqing 400067, P. R. China;
    2 CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
  • Received:2015-02-09 Revised:2015-04-01 Published:2015-06-05
  • Contact: FU Min, HE Tao E-mail:fumin1022@126.com;het@nanoctr.cn
  • Supported by:

    The project was supported by the Ministry of Science and Technology of China (2015DFG62610).

摘要:

用简单的超声分散法合成了具有可见光响应的类石墨氮化碳(g-C3N4)/BiVO4复合光催化剂. 采用X射线衍射(XRD), X射线光电子能谱(XPS), 扫描电子显微镜(SEM), 透射电子显微镜(TEM), 紫外-可见(UV-Vis)分光光谱, 傅里叶红外变换(FTIR)光谱, 荧光发射谱(PL)和光电流响应等技术对所制备催化剂进行相关表征. 通过可见光下(λ> 420 nm)光催化还原CO2的性能来评价样品的光催化活性, 发现不同复合比的催化剂中, 含40% (w) g-C3N4的复合催化剂表现出最高的光催化活性, 其催化活性分别为纯g-C3N4纳米片和纯BiVO4的催化活性的2倍和4倍.光催化活性增加的主要原因是g-C3N4和BiVO4之间形成了异质结, 且相互间能级匹配, 有利于光生电子和空穴的分离.

关键词: 光催化, CO2转化, 甲烷, 氮化碳, 钒酸铋

Abstract:

A visible-light-active graphitic-like carbon nitride (g-C3N4)/BiVO4 nanocomposite photocatalyst was synthesized using a facile ultrasonic dispersion method. The nanocomposite was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy, photoluminescence (PL) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and photocurrent response measurements. The photocatalytic activity in the photoreduction of CO2 under visible-light irradiation (λ>420 nm) was determined. The g-C3N4/BiVO4 catalyst containing 40% (w) g-C3N4 showed the highest photocatalytic activity; it was almost twice that of g-C3N4 nanosheets and four times that of BiVO4. The enhanced photocatalytic activity is attributed to the formation of heterostructures at the g-C3N4/BiVO4 interface and appropriate alignment of the energy levels between them, which can facilitate separation of photogenerated electrons and holes.

Key words: Photocatalysis, CO2 conversion, Methane, Carbon nitride, Bismuth vanadate

MSC2000: 

  • O643