上海大学学报(自然科学版) ›› 2017, Vol. 23 ›› Issue (3): 452-463.doi: 10.12066/j.issn.1007-2861.1686

• 研究论文 • 上一篇    下一篇

真空加热和电子束辐照改性处理g-C3N4光催化剂

张云龙, 浦娴娟, 程伶俐, 蒋永, 丁国际, 焦正   

  1. 上海大学环境与化学工程学院, 上海 200444
  • 收稿日期:2015-09-10 出版日期:2017-06-30 发布日期:2017-06-30
  • 通讯作者: 焦正(1972—), 男, 教授, 博士生导师, 博士, 研究方向为环境功能材料. E-mail: zjiao@shu.edu.cn
  • 作者简介:焦正(1972—), 男, 教授, 博士生导师, 博士, 研究方向为环境功能材料. E-mail: zjiao@shu.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(21371116)

Enhanced g-C3N4 photocatalyst with vacuum heating and electron beam irradiation

ZHANG Yunlong, PU Xianjuan, CHENG Lingli, JIANG Yong, DING Guoji, JIAO Zheng   

  1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
  • Received:2015-09-10 Online:2017-06-30 Published:2017-06-30

摘要:

将真空加热与电子束辐照两种改性后处理过程引入非金属光催化剂类石墨相氮化碳(graphitic carbon nitride, g-C3N4)的性能改善中. 这两种后处理方法都能有效地改善g-C3N4的光催化特性, 不过电子束辐照方法更具有破坏性, 会在一定程度上改变g-C3N4光催化剂本身的化学键和能带结构. 根据后处理的实施参数, 真空热处理(6.7±0.7 Pa, 4 d, 200°C)可以将原始的g-C3N4可见光光催化性能提高2.5倍, 而电子束辐照(800 kGy, 1.8 MeV, 8 mA·s−1)可以提高至4.5倍. 光催化循环实验显示了改性后光催化剂的循环稳定性, 也保证了这两种后处理方式的进一步实施.

关键词: 电子束辐照, 光催化剂, 后处理, 真空加热, 类石墨相氮化碳(graphitic carbon nitride, g-C3N4)

Abstract:

Two post-treatments, vacuum heating and electron beam irradiation are reported to enhance nonmetallic photocatalyst, graphitic carbon nitride (g-C3N4). These
two post-treatments reinforce visible light absorption abilities of g-C3N4. Nevertheless, electron beam irradiation is more destructive, causing a decided change for its chemical bonds and band structure. Based on the post-processing parameters given in this paper, vacuum heating (6.7±0.7 Pa for 4 d at 200°C) can enhance photocatalytic efficiency of original g-C3N4 by 2.5 times, and electron beam irradiation (800 kGy at 1.8 MeV and 8 mA·s−1) can improve that by 4.5 times. The post-treated photocatalysts are stable during photocatalytic reaction and ensure further applications of those two post-treatments.

Key words: electron beam irradiation, photocatalyst, post-treatment, vacuum heating, graphitic carbon nitride (g-C3N4)