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Highly efficient degradation of 2,4-dichlorophenol over CeO2/g-C3N4 composites under visible-light irradiation: Detailed reaction pathway and mechanism.

Authors
  • Humayun, Muhammad1
  • Hu, Zhewen1
  • Khan, Abbas2
  • Cheng, Wei1
  • Yuan, Yang1
  • Zheng, Zhiping1
  • Fu, Qiuyun1
  • Luo, Wei3
  • 1 Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, PR China. , (China)
  • 2 Department of Chemistry, Abdul Wali Khan University Mardan, 23200, KP, Pakistan. , (Pakistan)
  • 3 Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, PR China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
Feb 15, 2019
Volume
364
Pages
635–644
Identifiers
DOI: 10.1016/j.jhazmat.2018.10.088
PMID: 30396137
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Herein, we report for the first time the highly efficient degradation of 2,4-dichlorophenol (2,4-DCP) over CeO2/g-C3N4 composites (xCeO/CN) prepared via wet-chemical solution method. It is shown that the resultant nanocomposites with a proper mass ratio percentage (15%) of CeO coupled exhibit greatly enhanced visible-light activity for 2,4-dichlorophenol (2,4-DCP) degradation compared to the bare g-C3N4. From photoluminescence (PL) and Fluorescence (FL) results, it is suggested that enhanced photo-degradation is attributed to the significantly improved charge separation and transfer as a result of the proper band alignments between g-C3N4 and CeO components. Further, from radical trapping experiments, it is confirmed that hydroxyl radicals (OH) are the predominant oxidants involved in the degradation of 2,4-DCP over CeO/CN composites. Furthermore, a possible reaction pathway and detailed photocatalytic mechanism for 2,4-DCP degradation is proposed mainly based on the detected liquid chromatography tandem mass spectrometry (LC-MS) intermediate products, that readily transform into CO2 and H2O. This work would help researchers to deeply understand the reaction mechanism of 2,4-DCP and would provide feasible routes to fabricate g-C3N4-based highly efficient photocatalysts for environmental remediation. Copyright © 2018 Elsevier B.V. All rights reserved.

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