Photocatalytic degradation of clofibric acid by g-C3N4/P25 composites under simulated sunlight irradiation: The significant effects of reactive species
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]
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- DOI : http://dx.doi.org/10.1016/j.chemosphere.2017.01.015
- Elsevier : 저널> 권호 > 논문
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