FexN produced in pharmaceutical sludge biochar by endogenous Fe and exogenous N doping to enhance peroxymonosulfate activation for levofloxacin degradation

被引：116

作者：

Wu, Qinyue ^{[1
]}

Zhang, Yan ^{[1
,2
]}

Liu, He ^{[1
,2
]}

Liu, Hongbo ^{[1
,2
]}

Tao, Jia ^{[1
]}

Cui, Min-Hua ^{[1
,2
]}

Zheng, Zhiyong ^{[1
,2
]}

Wen, Donghui ^{[3
]}

Zhan, Xinmin ^{[4
]}

机构：

[1] Jiangnan Univ, Sch Environm & Civil Engn, Jiangsu Key Lab Anaerob Biotechnol, Wuxi 214122, Peoples R China

[2] Jiangsu Collaborat Innovat Ctr Water Treatment Te, Suzhou 215011, Peoples R China

[3] Peking Univ, Coll Environm Sci & Engn, Beijing 100871, Peoples R China

[4] Natl Univ Ireland, Coll Sci & Engn, Civil Engn, Galway, Ireland

来源：

WATER RESEARCH | 2022年 / 224卷

基金：

中国国家自然科学基金;

关键词：

Pharmaceutical sludge; Biochar; Levofloxacin; Persulfate; Catalytic degradation; DOPED GRAPHENE; SINGLET OXYGEN; PERSULFATE; CARBON; OXIDATION; NANOPARTICLES; PERFORMANCE; PYROLYSIS; CATALYSTS; WATER;

D O I：

10.1016/j.watres.2022.119022

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

For preparing high performance biochar to be applicated in persulfate-based oxidation treatment of wastewater, the feasibility of deriving Fe-N biochar from pharmaceutical sludge by endogenous Fe and exogenous N doping was investigated. With exogenous urea doping, FexN contained biochar (PZBC800U) was successfully derived from endogenous Fe(OH)3 contained pharmaceutical sludge. PZBC800U effectively activated peroxymonosulfate (PMS) to remove 80 mg center dot L-1 levofloxacin (LEV) within 90 min. The main mechanism of PMS activation by PZBC800U for LEV degradation was revealed as non-radical pathways dominated by O-1(2) generation and direct electron transfer. The formation of FexN combined with the increase of pyridinic-N in the biochar changed the electronic structure, improved the electron transfer ability, and thus achieved the excellent PMS activation ca-pacity of the biochar. The vital function of endogenous Fe(OH)(3) was verified by comparing PZBC800U to Fe leached and extra Fe added controls. A total of 18 intermediates in the degradation of LEV were identified, and degradation pathways were proposed. Combined with the average local ionization energy calculation, the pri-ority of piperazine breakage during LEV degradation was experimentally proved and mechanistically elucidated. This study provides a new insight into FexN biochar preparation from pharmaceutical sludge and the mechanisms of its excellent PMS activation performance for LEV degradation.

引用

页数：13