Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 279, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119361
Keywords
Biochar; Peroxymonosulfate (PMS); Peroxydisulfate (PDS); Sulfur doping; Nonradical oxidation
Funding
- National Nature Science Foundation of China [51978201]
- State Key Laboratory of Urban Water Resource and Environment [2020DX08]
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Sulfurized biochar derived from sewage sludge (SSB) was facilely synthesized and manifested upgraded performance in activation of peroxymonosulfate (PMS) and peroxydisulfate (PDS) for bisphenol A (BPA) elimination. The incorporated zigzag-edge sulfur effectively activated the sp(2)-hybridized graphene lattice, leading to the creation of more Lewis acid and basic sites in SSB. Singlet oxygen (O-1(2)) generated from PMS oxidation at the Lewis acid sites was confirmed to be the dominated reactive species for BPA removal in the SSB/PMS system, whereas electron-transfer reactions comprising surface-confined complexes originated from the intimate contact between PDS and Lewis basic sites played the decisive role in the SSB/PDS system. Nineteen intermediates were identified in the two systems and degradation pathways of BPA were deduced accurately as well. This work not only provides a novel modification strategy for the cog-effective and environment friendly biochar-based catalysts but also deepen the insight into mechanisms of persulfate activation with carbonaceous materials.
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