Abstract
• The FBC-APS could simultaneously degrade BaP and improve plant growth in soil. • Biogas residues from food waste were converted into biochar and became useful resources. • Possible mechanisms for BaP degradation by FBC-APS have been proposed. A graphitized magnetic biochar material, Fe-impregnated biochar (FBC), was synthesized using biogas residue, a product of food waste after anaerobic fermentation. The FBC coupled with ammonium persulfate (APS) exhibited excellent performance in the catalytic degradation of benzo[a]pyrene (BaP), a pentacyclic polycyclic aromatic hydrocarbon (PAH). In the FBC-APS system, the pyrolysis temperature of biochar, the initial pH, and the FBC and APS dosages were all influencing factors for Bap degradation. The FBC at the pyrolysis temperature of 700 °C performed the best catalytic performance, and FBC-APS efficiently degraded BaP at a wide pH range of 3–11. Results from quenching experiments, electron spin resonance measurement, and electrochemical analysis were used as the basis to propose the possible degradation mechanisms of BaP by FBC-APS, including the radical and non-radical pathways. The radical-induced oxidation was attained by SO 4 ·− and O 2 ·− . The non-radical pathway involved two aspects, one contributed by 1 O 2 and the other achieved through electron transfer. Five BaP intermediates were tentatively determined. Finally, FBC-APS was applied to BaP-polluted soil, and the overall degradation rate reached 91.7% after 72 h. Lettuce growth experiment showed that FBC-APS enhanced soil nitrogen and potassium availability and lettuce growth. In summary, FBC-APS application to soil can degrade BaP, improve the manurial effect, and solve environmental problems brought by biogas residues, that is, killing three birds with one stone.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.