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Chemosphere v.172, 2017년, pp.193 - 200   SCI SCIE SCOPUS
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Photocatalytic degradation of clofibric acid by g-C3N4/P25 composites under simulated sunlight irradiation: The significant effects of reactive species

Chen, Ping (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Wang, Fengliang (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Zhang, Qianxin (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Su, Yuehan (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Shen, Lingzhi (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Yao, Kun (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Chen, Zhi-Feng (School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China ) ; Liu, Yang (Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, China ) ; Cai, Zongwei (State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, ) ; Lv, Wenying ; Liu, Guoguang ;
  • 초록  

    Abstract Pharmaceutically emerging micropollutants have become an environmental concern in recent years. In the present paper, the reactive species (RSs)-induced degradation mechanism of clofibric acid (CA) was investigated using a newly sunlight-driven g-C 3 N 4 /P25 photocatalyst. A very low g-C 3 N 4 content of 8.0 weight percent resulted in a 3.36 and a 2.29 times faster reaction rate for CA photodegradation than for pristine g-C 3 N 4 and P25, respectively. Electron spin resonance and quenching experiments demonstrated the participation of HO, h + , e − , 1 O 2 and O 2 ·- in the photocatalytic system, and the contribution rates were calculated to 73.3%, 15.3%, 5.1%, 6.7% and 33.1%, respectively. According to the pulse radiolysis measurements and the competitive kinetics approaches, the bimolecular reaction rate constants for HO, e − , and 1 O 2 with CA were (8.47 ± 0.33) × 10 9 M −1 s −1 , (6.41 ± 0.48) × 10 9 M −1 s −1 and (6.6 ± 0.37) × 10 6 M −1 s −1 , respectively. RSs were found to significantly influence the degradation of CA, and the degradation pathways occurred primarily via e − reduction, HO addition and 1 O 2 attack reactions on the basis of mass spectrometry and theoretical calculations. Highlights Synthesis and characterization of a sunlight-driven g-C 3 N 4 /P25 photocatalyst. Photocatalytic activity for degradation of clofibric acid under simulated sunlight irradiation. Significant roles of reactive species during the photocatalytic process. Degradation pathways of clofibric acid via g-C 3 N 4 /P25. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Photocatalysis .   Clofibric acid .   g-C3N4/P25 .   Reactive species .   Pathways.  

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