高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (2): 246.doi: 10.7503/cjcu20160524

• 物理化学 • 上一篇    下一篇

氮掺杂石墨烯与g-C3N4二维异质体对纳米Fe2O3光催化剂的复合改性

王金双, 秦川丽(), 王虹涧, 李佳栋, 张旭良, 陈双影, 井立强()   

  1. 黑龙江大学化学化工与材料学院, 功能无机材料化学教育部重点实验室, 哈尔滨 150080
  • 收稿日期:2016-07-19 出版日期:2017-02-10 发布日期:2017-01-17
  • 作者简介:联系人简介: 秦川丽, 女, 博士, 教授, 主要从事环境功能材料研究. E-mail: qinchuanli@hlju.edu.cn; 井立强, 男, 博士, 教授, 主要从事光电化学与光催化研究. E-mail: jingliqiang@hlju.edu.cn
  • 基金资助:
    国家自然科学联合基金重点项目(批准号: U1401245)、 教育部科学技术研究项目(批准号: 213011A)和黑龙江省留学归国人员科学基金(批准号: LC2016003)资助

Modification of Nano-sized Fe2O3 Photocatalysts with N-doped Graphene and g-C3N4

WANG Jinshuang, QIN Chuanli*(), WANG Hongjian, LI Jiadong, ZHANG Xuliang, CHEN Shuangying, JING Liqiang*()   

  1. Key Laboratory of Functional Inorganic Materials Chemistry, Ministry of Education,School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
  • Received:2016-07-19 Online:2017-02-10 Published:2017-01-17
  • Contact: QIN Chuanli,JING Liqiang E-mail:qinchuanli@hlju.edu.cn;jingliqiang@hlju.edu.cn
  • Supported by:
    † Supported by the Joint Funds of the National Natural Science Foundation of China(No.U1401245), the Project of Chinese Ministry of Education(No.213011A) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars of Heilongjiang Province, China(No.LC2016003)

摘要:

使用相分离的水解-溶剂热法制备了α-Fe2O3纳米粒子, 通过简单的湿化学法实现了质量分数为3%的石墨烯、 氮掺杂石墨烯和g-C3N4 3种二维异质体对纳米α-Fe2O3的复合改性, 并比较了3种二维异质体对α-Fe2O3光催化活性的影响. 结果表明, 在光催化还原二氧化碳和降解液相苯酚过程中, 二维异质体的复合均提高了纳米α-Fe2O3的光催化活性, 氮掺杂石墨烯对α-Fe2O3的改性效果优于石墨烯, 其中g-C3N4α-Fe2O3的改性效果最优. 通过表面光电压谱、 光电化学及羟基自由基等测试, 确认二维异质体的复合改性主要通过促进纳米α-Fe2O3的光生电荷分离和提高活性中间组分(羟基自由基)的含量提高纳米α-Fe2O3的光催化活性.

关键词: 纳米α-Fe2O3, 二维异质体复合改性, 光生电荷分离, 二氧化碳还原, 污染物降解

Abstract:

Alpha iron-trioxide(α-Fe2O3) nanoparticles were synthesized by a phase-separated hydrolysis-solvothermal method, and then modified by coupling 3%(mass fraction) graphene, nitrogen-doped graphene and g-C3N4 as the two-dimensional hetero-materials by a simple wet chemical process. Detailed comparative studies of their effects on photocatalytic activities of α-Fe2O3 were carried out. The results show that the photocatalytic activities of nano α-Fe2O3 for reducing CO2 to CO and for degrading phenol are enhanced after coupling with all two-dimensional hetero-materials. The modification of nitrogen-doped graphene on α-Fe2O3 is better than graphene and the modification of g-C3N4 on α-Fe2O3 is the best. Based on the measurements of surface photovoltage responses, photoelectrochemical curves, and hydroxyl radical amounts, it is confirmed that the introduction of two-dimensional hetero-materials would promote the photogenerated charge separation and increase the content of the active intermediate(hydroxyl radicals) consequently, leading to the improved photocatalytic activity of nano α-Fe2O3.

Key words: α-Fe2O3, Two-dimensional hetero-material modification, Photogenerated charge separation, CO2 reduction, Pollutant degradation

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