Preparation of magnetic N-doped iron sludge based biochar and its potential for persulfate activation and tetracycline degradation

生物炭 过硫酸盐 热解 降级(电信) 化学 核化学 四环素 环境化学 兴奋剂 废物管理 制浆造纸工业 材料科学 化学工程 有机化学 催化作用 生物化学 电信 工程类 抗生素 光电子学 计算机科学
作者
Huiping Zeng,Jianxue Li,Jiaxin Xu,Qi Wei,Ruixia Hao,Guowei Gao,Da Lin,Dong Li,Jie Zhang
出处
期刊:Journal of Cleaner Production [Elsevier BV]
卷期号:378: 134519-134519 被引量:40
标识
DOI:10.1016/j.jclepro.2022.134519
摘要

The widespread use of tetracycline (TC) severely damages the aquatic environment. Economical, green and efficient treatment methods are urgently needed. In this study, a magnetic N-doped iron sludge based biochar (N–BCFe) was prepared by a one-step pyrolysis method using the iron-containing sludge from groundwater treatment plants, sycamore leaves and urea as raw materials to active PS for TC degradation. The results show that under the optimal experimental conditions, the removal rate of 10 mg/L TC in the N–BCFe/PS system could reach 86.56% (120 min), accompanied by a 59.9% reduction in Total Organic Carbon (TOC), and still 63.34% of TC was removed in the third recycle experiment. Combined with EPR, free radical quenching experiments and XPS spectra, it is confirmed that there are free radicals (S O 4 · − , ·OH) and non-radical ( 1 O 2 ) pathways in N–BCFe/PS system. And the former is related to Fe doping, while the latter is attributed to N doping (nitrogen-containing functional groups). Seventeen TC intermediates were identified by LC-MS technology, and three TC degradation pathways were established accordingly. • A magnetic N-doped iron sludge based BC was successfully prepared by a one-step pyrolysis method. • Fe and N were involved in the free radical and non-radical pathways of TC degradation, respectively. • N–BCFe showed good separation and reusability.
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