Degradation mechanism of metronidazole using persulfate activated by boron/copper doped biochar derived from Chlorella vulgaris

文献类型： 外文期刊

第一作者： Zhang, Cheng

作者： Zhang, Cheng;Zhang, Chunxin;Dawolo, Edwin Hena;Liu, Hong;Chen, Bingfa;Chen, Bingfa;Ding, Ning

作者机构：

关键词： Chlorella biochar; Persulfate activation; Antibiotics; Metronidazole

期刊名称：PROCESS SAFETY AND ENVIRONMENTAL PROTECTION （ 影响因子：7.8； 五年影响因子：7.7 ）

ISSN： 0957-5820

年卷期： 2024 年 191 卷

页码：

收录情况： SCI

摘要： Chlorella biochar modified with boron and copper (B/Cu-BC) was created and used to break down the antibiotic metronidazole (MNZ) through peroxymonosulfate (PMS) activation. The physicochemical properties of B/Cu-BC were analyzed using SEM, BET, FTIR, XRD and XPS. The results showed that the modified Chlorella biochar, which included several oxygen-containing functional groups, exhibited a rise of 7.1 times in specific surface area and a rise of 8 times in pore volume compared to the unmodified variant. Under the optimal conditions, the B/Cu-BC+PMS system removed 86.6 % of MNZ in 90 min. The reaction mechanism of the system was confirmed by Quenching and electron paramagnetic resonance (EPR) experiments. The B/Cu-BC+PMS system was accompanied by SO4 center dot(-), center dot OH, center dot O-2(-) and O-1(2), in which center dot O(2)(-)was the main reactive oxygen species (ROS). The intermediates in the degradation process of MNZ were investigated using HPLC-MS, and two potential degradation pathways of MNZ were suggested. Finally, the toxicology of the intermediates from the MNZ degradation process was analyzed by toxicity estimation software tool. The bioconcentration coefficients and mutagenicity coefficients showed a significant decrease, indicating that the system could efficiently degrade the antibiotic MNZ in an environmentally friendly manner.

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