In situ Carbon Modification of g-C3N4 from Urea co-Crystal with Enhanced Photocatalytic Activity Tow

• 作 者: ZHAO Weifeng HAO Ning ZHANG Gai MA Aijie CHEN Weixing ZHOU Hongwei YANG Dong XU Ben Bin KONG Jie
• 机 构: School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710021, P. R. Ch
• 出 处: 高等学校化学研究（英文版）
• 发表日期: 2020年6期
• 关键词: Graphitic carbon nitride Carbon composite Photocatalysis Photodegradation

An in situ strategy was introduced for synthesizing carbon modified graphitic carbon nitride(g-C3N4)by using urea/4-aminobenzoic acid(PABA)co-crystal(PABA@Urea)as precursor materials.Via co-calcination of the PABA co-former and the urea in PABA@Urea co-crystals,C guest species were generated and compounded into g-C3N4 matrix in situ by replacing the lattice N of the carbon nitride and forming carbon dots onto its layer surface.The carbon modification dramatically enhanced visible-light harvesting and charge carrier separation.Therefore,visible light photo-catalytic oxidation of methylene blue(MB)pollution in water over the carbon modified g-C3N4(C/g-C3N4)was notably improved.Up to 99％of methylene blue(MB)was eliminated within 60 min by the optimal sample prepared from the PABA@Urea co-crystal with a PABA content of 0.1％(mass ratio),faster than the degrada-tion rate over bare g-C3N4.The present study demonstrates a new way to boost up the photocatalysis performance of g-C3N4,which holds great potential concerning the degradation of organic dyes from water.