无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (8): 21-27.doi: 10.19964/j.issn.1006-4990.2023-0310

• 新型无机材料在光电催化中的应用 • 上一篇    下一篇

铜掺杂TiO2/PCN异质结光催化还原二氧化碳性能研究

赵炎(), 郝雪薇, 时海南, 李佳慧, 李克艳(), 郭新闻()   

  1. 大连理工大学化工学院精细化工国家重点实验室智能材料化工前沿科学中心,辽宁大连 116024
  • 收稿日期:2023-06-08 出版日期:2023-08-10 发布日期:2023-08-25
  • 通讯作者: 李克艳(1979— ),女,博士,副教授,研究方向为光催化、高级氧化技术;E-mail:keyanli@dlut.edu.cn
    郭新闻(1967— ),男,博士,教授,研究方向为分子筛催化、二氧化碳催化转化;E-mail:guoxw@dlut.edu.cn
  • 作者简介:赵炎(1999— ),男,研究方向为光催化二氧化碳还原;E-mail:1798161962@qq.com
  • 基金资助:
    辽宁省自然科学基金项目(2022-MS-131);中央高校基本科研业务费专项资金资助项目(DUT22LAB602)

Study on photocatalytic CO2 reduction performance of Cu-doped TiO2/PCN heterojunction

ZHAO Yan(), HAO Xuewei, SHI Hainan, LI Jiahui, LI Keyan(), GUO Xinwen()   

  1. State Key Laboratory of Fine Chemicals,Frontier Science Center for Smart Materials,School of ChemicalEngineering,Dalian University of Technology,Dalian 116024,China
  • Received:2023-06-08 Published:2023-08-10 Online:2023-08-25

摘要:

以CuCl2、NH2-MIL-125(Ti)和尿素为前驱物,通过煅烧法制备了不同Cu掺杂量的二氧化钛/聚合氮化碳(PCN)异质结(CuTiCN)。其中3CuTiCN光催化还原CO2性能最优,在可见光下CO的产生速率可达735 µmol/(g·h),分别是纯PCN和TiO2/PCN异质结的9倍和3倍。利用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、氮气物理吸附、紫外可见漫反射光谱、光致发光谱(PL)等手段对光催化剂的组成、结构和光电化学性质进行了表征。研究发现,Cu掺杂和异质结的构建增强了可见光吸收,增大了材料的比表面积,提高了光生载流子的分离和传递效率。根据带隙数据和莫特-肖特基曲线得到了异质结的能带结构,并提出了Cu掺杂TiO2/PCN异质结光催化还原CO2的机理。

关键词: 光催化, 二氧化碳还原, 聚合氮化碳, Cu掺杂, 异质结

Abstract:

TiO2/PCN heterojunctions(CuTiCN) with different Cu doping contents were prepared by calcination methods using CuCl2,NH2-MIL-125(Ti) and urea as precursors. The 3CuTiCN photocatalyst exhibited the best photocatalytic CO2 reduction performance with CO evolution rate of 735 µmol/(g·h),which was 9 and 3 times of the PCN and TiO2/PCN heterojunction,respectively.The composition,structure and photoelectrochemical properties of the photocatalysts were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),nitrogen physical adsorption,UV-Vis-DRS spectra,PL spectra,and etc.It was found that Cu doping and construction of heterojunction enhanced the visible light absorption,increased the specific surface area and promoted the separation and transfer efficiency of photogenerated carriers.Furthermore,the band structure of the heterojunction was obtained based on the band gap data and Mott-Schottky plots,and the photocatalytic mechanism of CO2 reduction over Cu-doped TiO2/PCN heterojunction was proposed.

Key words: photocatalysis, CO2 reduction, polymeric carbon nitride, Cu doping, heterojunction

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