高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (8): 1450-1457.doi: 10.7503/cjcu20160809

• 物理化学 • 上一篇    下一篇

乙酸修饰Ag/TiO2复合光催化剂的制备及协同催化性能

阿山1,2, 郑家威1,2, 刘聚明2,3, 白杰1,2, 杨桔材2,3, 张前程1,2   

  1. 1. 内蒙古工业大学化工学院, 呼和浩特 010051;
    2. 内蒙古自治区工业催化重点实验室, 呼和浩特 010051;
    3. 内蒙古工业大学能源与动力工程学院, 呼和浩特 010051
  • 收稿日期:2016-11-21 修回日期:2017-07-14 发布日期:2017-07-28
  • 通讯作者: 张前程,男,博士,教授,博士生导师,主要从事光催化研究.E-mail:jzhang@imut.edu.cn E-mail:jzhang@imut.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20966006)、内蒙古自治区自然科学基金(批准号:2014MS0218)和内蒙古自治区高等学校创新团队发展计划项目(批准号:NMGIRT-A1603)资助.

Preparation and Synergistic Catalytic Performance of Ag/TiO2 Composite Photocatalysts Modified by Acetic Acid

A Shan1,2, ZHEN Jiawei1,2, LIU Juming2,3, BAI Jie1,2, YANG Jucai2,3, ZHANG Qiancheng1,2   

  1. 1. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
    2. Key Laboratory of Industrial Catalysis of the Inner Mongolia Autonomous Region, Inner Mongolia University of Technology, Hohhot 010051, China;
    3. School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
  • Received:2016-11-21 Revised:2017-07-14 Published:2017-07-28
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20966006), the Natural Science Foundation of the Inner Mongolia Autonomous Region, China(No.2014MS0218) and the Program for Innovative Research Team in Universities of Inner Mongolia Autonomous Region, China(No.NMGIRT-A1603).

摘要:

利用光化学还原法制备了Ag/TiO2,然后通过乙酸浸渍制备了HAc-Ag/TiO2复合光催化剂.利用X射线衍射(XRD)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis DRS)等手段表征了催化剂的性质.以降解水溶液中的甲基橙(MO)为探针反应,考察了催化剂在可见光下的光催化性能.结果表明,乙酸对TiO2的修饰在TiO2禁带中产生了"带尾",使TiO2的禁带宽度发生了显著的缩减;Ag纳米粒子和乙酸共同修饰的HAc-Ag/TiO2样品具有更窄的禁带宽度和更正的价带顶位置;Ag和乙酸的协同作用使HAc-Ag/TiO2具有良好的可见光催化活性:可见光照射2 h后,甲基橙在HAc-Ag/TiO2上的降解率接近100%.

关键词: 二氧化钛, 银纳米粒子, 乙酸修饰, 可见光催化

Abstract:

Ag/TiO2 sample was prepared by photochemical reduction approach, and then the sample was impregnated with acetic acid to obtain the HAc-Ag/TiO2 composite photocatalysts. The samples were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS), X-ray photoelectron spectroscopy(XPS) and Fourier transform infrared(FTIR) spectroscopy. The visible light photocatalytic degradation of methyl orange(MO) in an aqueous solution was used as a probe reaction to evaluate the photocatalytic activity of the obtained samples. It reveals that the modifying of acetic acid can obviously narrow the bandgap of TiO2 via the formation of band tail in the bandgap of TiO2. Especially, the co-modification of Ag and acetic acid resulted in more narrow TiO2 bandgap and more positive top of valence band. The synergistic effects of Ag and acetic acid on TiO2 enhanced the photocatalyst performance of HAc-Ag/TiO2 composite. Under visible light irradiation, nearly 100% of MO was degraded within 2 h on the HAc-Ag/TiO2 photocatalyst.

Key words: TiO2, Ag nanoparticles, Acetic acid modifying, Visible-light photocatalysis

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