SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 40 ›› Issue (12): 293-303.DOI: 10.1016/j.cjche.2021.06.021

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Modified g-C3N4 derived from ionic liquid and urea for promoting visible-light photodegradation of organic pollutants

Hongbing Song1, Lei Liu1, Bingxiao Feng1, Haozhong Wang1, Meng Xiao1, Hengjun Gai1, Yubao Tang2, Xiaofei Qu3, Tingting Huang1   

  1. 1. State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    2. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    3. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
  • Received:2021-03-16 Revised:2021-06-08 Online:2022-01-14 Published:2021-12-28
  • Contact: Tingting Huang,E-mail:huangtingting@qust.edu.cn
  • Supported by:
    We thank the support provided by the National Natural Science Foundation of China (21878164, 21978143), Shandong Provincial Key Research and Development Program (2019GGX102029), “QingChuang Science and Technology Plan” Project of Colleges and Universities in Shandong Province (2020KJC005), and State Key Laboratory of Materials-Oriented Chemical Engineering-Open Fund (KL19-08).

Modified g-C3N4 derived from ionic liquid and urea for promoting visible-light photodegradation of organic pollutants

Hongbing Song1, Lei Liu1, Bingxiao Feng1, Haozhong Wang1, Meng Xiao1, Hengjun Gai1, Yubao Tang2, Xiaofei Qu3, Tingting Huang1   

  1. 1. State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    2. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
    3. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
  • 通讯作者: Tingting Huang,E-mail:huangtingting@qust.edu.cn
  • 基金资助:
    We thank the support provided by the National Natural Science Foundation of China (21878164, 21978143), Shandong Provincial Key Research and Development Program (2019GGX102029), “QingChuang Science and Technology Plan” Project of Colleges and Universities in Shandong Province (2020KJC005), and State Key Laboratory of Materials-Oriented Chemical Engineering-Open Fund (KL19-08).

Abstract: In this work, modified g-C3N4 was fabricated successfully by calcination of ionic liquid (IL) and urea. The addition of IL changed the polymerization mode of urea, induced the self-assembly of urea molecules, modified the morphological structure of the tightly packed g-C3N4, and extended the electron conjugation system. When using 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) as a modifier, the heteroatom Cl could be inserted into the g-C3N4 to optimize the electronic structure. The results of characterizations indicate that the unique structure of modified g-C3N4 has an expanded electron delocalization range, introduces an interlayer charge transmission channel, promotes the charge transmission, reduces the band gap, enhances the absorption of visible light, and inhibits electron-hole recombination. Modified g-C3N4 showed excellent photocatalytic performance for the degradation of rhodamine B and tetracycline. Furthermore, the effect of different anions in 1-butyl-3-methylimidazolium salts ([Bmim]Cl, [Bmim]Br, [Bmim][BF4], and [Bmim][PF6]) on the structure and function of g-C3N4 are discussed.

Key words: Graphite carbon nitride, Ionic liquid, Photocatalysts, Element doping, Organic pollutants

摘要: In this work, modified g-C3N4 was fabricated successfully by calcination of ionic liquid (IL) and urea. The addition of IL changed the polymerization mode of urea, induced the self-assembly of urea molecules, modified the morphological structure of the tightly packed g-C3N4, and extended the electron conjugation system. When using 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) as a modifier, the heteroatom Cl could be inserted into the g-C3N4 to optimize the electronic structure. The results of characterizations indicate that the unique structure of modified g-C3N4 has an expanded electron delocalization range, introduces an interlayer charge transmission channel, promotes the charge transmission, reduces the band gap, enhances the absorption of visible light, and inhibits electron-hole recombination. Modified g-C3N4 showed excellent photocatalytic performance for the degradation of rhodamine B and tetracycline. Furthermore, the effect of different anions in 1-butyl-3-methylimidazolium salts ([Bmim]Cl, [Bmim]Br, [Bmim][BF4], and [Bmim][PF6]) on the structure and function of g-C3N4 are discussed.

关键词: Graphite carbon nitride, Ionic liquid, Photocatalysts, Element doping, Organic pollutants