Photocatalytic degradation of clofibric acid by g-C3N4/P25 composites under simulated sunlight irradiation: The significant effects of reactive species

Ping Chen, Fengliang Wang, Qianxin Zhang, Yuehan Su, Lingzhi Shen, Kun Yao, Zhi Feng Chen, Yang Liu, Zongwei CAI, Wenying Lv, Guoguang Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

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-C3N4/P25 photocatalyst. A very low g-C3N4content 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-C3N4and P25, respectively. Electron spin resonance and quenching experiments demonstrated the participation of HO[rad], h+, e,1O2and O2·-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[rad], e, and1O2with CA were (8.47 ± 0.33) × 109 M−1s−1, (6.41 ± 0.48) × 109 M−1s−1and (6.6 ± 0.37) × 106 M−1s−1, respectively. RSs were found to significantly influence the degradation of CA, and the degradation pathways occurred primarily via ereduction, HO[rad] addition and1O2attack reactions on the basis of mass spectrometry and theoretical calculations.

Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalChemosphere
Volume172
DOIs
Publication statusPublished - 2017

Scopus Subject Areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

User-Defined Keywords

  • Clofibric acid
  • g-CN/P25
  • Pathways
  • Photocatalysis
  • Reactive species

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