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]
- 원문이 없습니다.
- DOI : http://dx.doi.org/10.1016/j.chemosphere.2017.01.015
- Elsevier : 저널> 권호 > 논문
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기