Degradation of sulfamethazine by biochar-supported bimetallic oxide/persulfate system in natural water: Performance and reaction mechanism

生物炭 过硫酸盐 化学 降级(电信) 热解 脱氢 氧化物 降水 环境化学 化学工程 催化作用 有机化学 物理 气象学 工程类 电信 计算机科学
作者
Fanzhi Qin,Yijiao Peng,Ge Song,Qingxuan Fang,Xi Wang,Chen Zhang,Guangming Zeng,Danlian Huang,Cui Lai,Yaoyu Zhou,Xiaofei Tan,Min Cheng,Shiyu Liu
出处
期刊:Journal of Hazardous Materials [Elsevier]
卷期号:398: 122816-122816 被引量:168
标识
DOI:10.1016/j.jhazmat.2020.122816
摘要

The rapid development of aquaculture results in the increased concentrations and kinds of antibiotics in water environment, and the sharply growing antibiotic contamination has caused increasing concerns. Herein, an innovative sulfamethazine (SMT) removal approach was developed by activation of persulfate (PS) using biochar-based materials prepared by co-precipitation and pyrolysis: Fe-Mg oxide/biochar (FeMgO/BC). Experiments on the activation of PS by FeMgO/BC under different factors were carried out. The involved mechanism and degradation pathway were also studied. Notably, the SMT removal rate reached 99 % under the optimum reaction condition, while the TOC removal efficiency reached 77.9 %. PS was activated by FeMgO/BC and the dominated active radical was SO4•−. Fe2+ from FeMgO and the hydroxyl and carboxyl groups on the surface of biochar contributed to the production of SO4•−. The dehydrogenation, bond cracking and unsaturated bond addition process occurred in the degradation of SMT. Furthermore, FeMgO/BC exhibits excellent reusability and stability. Considering the outstanding actual water application performances and the weak biotoxicity, FeMgO/BC shows a promising potential in the removal of antibiotics under actual water conditions.
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