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 sp²-hybridized graphene lattice, leading to the creation of more Lewis acid and basic sites in SSB. Singlet oxygen (¹O₂) 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 cost-effective and environment friendly biochar-based catalysts but also deepen the insight into mechanisms of persulfate activation with carbonaceous materials.

可以轻松地合成源自污水污泥（SSB）的硫化生物炭，并在活化过氧一硫酸盐（PMS）和过氧二硫酸盐（PDS）活化双酚A（BPA）的过程中表现出更高的性能。掺入的锯齿形边缘硫有效地激活了sp ^2-杂化的石墨烯晶格，从而在SSB中产生了更多的路易斯酸和碱性位。单线态氧（¹ O ₂）由路易斯酸位点的PMS氧化产生的）被证实是SSB / PMS系统中BPA去除的主要反应物种，而包含表面受限复合物的电子转移反应则起因于PDS和Lewis碱性位点之间的紧密接触在SSB / PDS系统中起决定性作用。在这两个系统中鉴定出19种中间体，并且还准确推断出BPA的降解途径。这项工作不仅为具有成本效益和环境友好的生物炭基催化剂提供了新颖的改性策略，而且加深了对含碳材料过硫酸盐活化机理的认识。