Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1265-1271.doi: 10.1007/s40242-020-0073-7

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In situ Carbon Modification of g-C3N4 from Urea co-Crystal with Enhanced Photocatalytic Activity Towards Degradation of Organic Dyes Under Visible Light

ZHAO Weifeng1, HAO Ning1, ZHANG Gai1, MA Aijie1, CHEN Weixing1, ZHOU Hongwei1, YANG Dong2, XU Ben Bin3, KONG Jie2   

  1. 1. School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, P. R. China;
    2. Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072, P. R. China;
    3. Department of Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
  • Received:2020-03-25 Revised:2020-05-20 Online:2020-12-01 Published:2020-06-10
  • Contact: ZHAO Weifeng, CHEN Weixing, KONG Jie E-mail:zhaoweifeng@xatu.edu.cn;chenwx@xatu.edu.cn;kongjie@nwpu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.61604120, 51603164), the Natural Science Foundation of Shaanxi Province, China(No.2019JM-527), the Natural Science Basic Research Plan in Shaanxi Province, China (No.2018JC-008), and the Key Research and Development Plan for Industry Innovation Chain(Cluster) of Shaanxi Province, China(No.2018ZDCXL-GY-09-07).

Abstract: 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 degradation 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.

Key words: Graphitic carbon nitride, Carbon composite, Photocatalysis, Photodegradation