Neglected but Efficient Electron Utilization Driven by Biochar-Coactivated Phenols and Peroxydisulfate: Polyphenol Accumulation Rather than Mineralization
Zhejiang University · Wayne State University · +3 more institutions
Abstract
We report an unrecognized but efficient nonradical mechanism in biochar-activated peroxydisulfate (PDS) systems. Combining a newly developed fluorescence trapper of reactive oxygen species with steady-state concentration calculations, we showed that raising pyrolysis temperatures of biochar (BC) from 400 to 800 °C remarkably enhanced trichlorophenol degradation but inhibited the catalytic production of radicals (SO4•– and •OH) in water and soil, thereby switching a radical-based activation into an electron-transfer-dominated nonradical pathway (contribution increased from 12.9 to 76.9%). Distinct from previously reported PDS* complex-determined oxidation, in situ Raman and electrochemical results of this study…
Citation impact
- FWCI
- 19.79
- Percentile
- 100%
- References
- 41
Authors
6Topics & keywords
- Peroxydisulfate
- Biochar
- Chemistry
- Photochemistry
- Electron transfer
- Radical
- Redox
- Electron acceptor