Preparation of magnetic nitrogen-doped fir sawdust biochar to activate peroxymonosulfate for Levofloxacin degradation

被引：0

作者：

Wang J. ^{[1
]}

Lu C. ^{[1
]}

Li Z. ^{[1
]}

Jiang L. ^{[1
]}

Han B. ^{[2
]}

Zhang H. ^{[1
,3
]}

机构：

[1] School of Resources, Environment and Materials, Guangxi University, Nanning

[2] Scientific Research Academy of Guangxi Environmental Protection, Nanning

[3] Petrochemical Resources Processing and Process Reinforcement Technology Key Laboratory of Guangxi Province, School of Chemistry and Chemical Engineering, Guangxi University, Nanning

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 11期

基金：

中国国家自然科学基金;

关键词：

biochar; degradation; levofloxacin; magnetite; nitrogen doping; peroxymonosulfate;

D O I：

10.13801/j.cnki.fhclxb.20230222.011

中图分类号：

学科分类号：

摘要：

Guangxi's large amount of waste fir sawdust is a valuable resource in the wrong place. In order to realize cyclic utilization of fir sawdust, biochar composites with magnetic recovery capability were prepared from waste fir sawdust, and the performance of activated peroxymonosulfate (PMS) to degrade levofloxacin (LEV) antibiotics was studied in this study. Magnetic nitrogen-doped fir sawdust biochar (MNC) with high PMS activation ability and excellent magnetic separation performance was synthesized by nitrogen doping and loading Fe3O4. Several characterizations confirm that compared with fir sawdust biochar (BC), MNC has higher graphitization, more defect active sites, significantly improved specific surface area, superparamagnetism and large magnetic saturation intensity, with a saturation magnetization value of 10.45 emu·g−1. In addition, the effects of various environmental factors on the degradation of LEV by MNC are simulated. The effects of PMS concentration, MNC dosage, initial pH of solution, inorganic anions and humic acid are mainly investigated. The results shows that compares with BC, magnetic biochar (MC) and nitrogen doped biochar (NC), the efficiency of degradation of LEV by MNC activated PMS is significantly improved. Under the conditions of MNC dosage of 1.0 g/L, PMS concentration of 0.3 mmol/L, initial pH of 7, and LEV concentration of 10 mg/L, the removal rate of LEV reachs 84% in 30 minutes, and the removal rates of bisphenol A (BPA), rhodamine B (RhB), and tetracycline (TC) are 94%, 98% and 87%, respectively. Cl−, NO3− and humic acid have no obvious effect on the degradation of LEV by MNC activated PMS. The quenching experiments show the generation of O2−• and 1O2 through free radical and non-free radical pathways dominate the degradation of LEV in MNC/PMS system. In addition, after 4 cycles of MNC, the efficiency of activating PMS to remove LEV can still reach about 75%. This study provides a new strategy and reference for the efficient and green resource utilization of waste fir sawdust. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：6383 / 6394

页数：11

共 40 条

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