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

• 作者: Hongbing Song Lei Liu Bingxiao Feng Haozhong Wang Meng Xiao Hengjun Gai Yubao Tang Xiaofei Qu Tingting Huang
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（12）
• 所属期刊栏目: Resources and Environmental Technology
• 页码范围: 293-303
• 页数: 11页
• 语种: 英文

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 conjuga-tion system.When using 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) as a modifier,the heteroa-tom 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 delo-calization range,introduces an interlayer charge transmission channel,promotes the charge transmis-sion,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 rho-damine 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.