Photo-Fenton degradation of emerging pollutants over Fe-POM nanoparticle/porous and ultrathin g-C3N4 nanosheet with rich nitrogen defect: Degradation mechanism, pathways, and products toxicity…

By Jingjing Jiang, Xingyue Wang, Yi Liu, Yuhan Ma, Tianren Li, Yanhong Lin, T. Xie, S. Dong. 2020

283 citations recorded by the source corpus.

Abstract Surface defect engineering has been suggested as an effective strategy to enhance photo-Fenton degradation performance. However, the underlying impact mechanism remains unknown. This study precisely constructed an efficient photo-Fenton catalyst through self-assembly of Fe-polyoxometalates nanoparticles on porous and ultrathin g-C3N4 nanosheets with nitrogen vacancies (Fe-POM/CNNS-Nvac). These nitrogen vacancies promoted photo-Fenton reaction rate constant for tetracycline hydrochloride (TCH) from 0.0950 to 0.1520 min−1 under visible light irradiation. Scavenging experiments and characterization results indicated that nitrogen vacancies could accelerate Fe(III)/Fe(II) conversion for OH and 1O2 generation, and directly regulate electronic structure for O2− generation. The possible degradation pathways of TCH were interpreted using experimental results and frontier electron density calculations. The results indicated that holes (h+) were responsible for ring-opening and 1O2/ OH/ O2− contributed to demethylation, deamination, and further mineralization. This study provides novel insight for the design of highly efficient catalysts with nitrogen vacancies for the removal of emerging pollutants.

Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/700e285e7550cafe3fb6d746e7b68a6ef46ae116