Degradation mechanism and ecotoxicity analysis of levofloxacin by palladium-modified nano zero-valent iron doped coconut shell biochar

文献类型： 外文期刊

第一作者： Tian, Yuxuan

作者： Tian, Yuxuan;Luo, Shicong;Dawolo, Edwin Hena;Liu, Hong;Chen, Bingfa;Chen, Bingfa;Ding, Ning

作者机构：

关键词： Bimetallic modification; Nano zero-valent iron; Biochar; Antibiotics; Toxicity analysis

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2024 年 12 卷 5 期

页码：

收录情况： SCI

摘要： The palladium-modified nano zero-valent iron (nZVI) doped coconut shell biochar (Pd-nZVI/BC) was successfully obtained through bimetallic modification and liquid-phase reduction. The synthesized Pd-nZVI/BC was further enhanced by the addition of an H2O2 co-catalyst for the removal of antibiotic levofloxacin (LVF). Results demonstrated that removal of LVF by Pd-nZVI/BC accomplished 94.6 % under proper conditions. Adsorption and degradation processes were involved in the LVF removal, and the predominant free radicals were center dot OH and center dot O2-. Adsorption relied mainly on electrostatic interactions, pi-pi interactions, and hydrogen bonding. While demethylation, deamidation, quinolone ring aldolization, depiperazinylation, deacetylation, decarboxylation, dehydroxylation, and oxidative breakage of the piperazine ring occurred during the degradation processes. Based on the degradation pathways, the ecotoxicity of LVF and its degradation intermediates were compared and assessed. Results implied that majority of the antibiotic LVF pollutant was eliminated or mineralized, and the toxicity potential of LVF was reduced in the Pd-nZVI/BC system. Simultaneous biochar utilization and pollutants removal could be achieved.

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