Sludge-derived biochar as efficient persulfate activators: Sulfurization-induced electronic structure modulation and disparate nonradical mechanisms

被引：275

作者：

Wang, Huazhe ^{[1
]}

Guo, Wanqian ^{[1
]}

Liu, Banghai ^{[1
]}

Si, Qishi ^{[1
]}

Luo, Haichao ^{[1
]}

Zhao, Qi ^{[1
]}

Ren, Nanqi ^{[1
]}

机构：

[1] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2020年 / 279卷

关键词：

Biochar; Peroxymonosulfate (PMS); Peroxydisulfate (PDS); Sulfur doping; Nonradical oxidation; REDUCED GRAPHENE OXIDE; SINGLET OXYGEN; BISPHENOL-A; ORGANIC CONTAMINANTS; DOPED GRAPHENE; SEWAGE-SLUDGE; SULFAMETHOXAZOLE DEGRADATION; PEROXYDISULFATE ACTIVATION; CATALYTIC-OXIDATION; CARBON;

D O I：

10.1016/j.apcatb.2020.119361

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：11

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