Performance and mechanism of sulfadiazine and norfloxacin adsorption from aqueous solution by magnetic coconut shell biochar

被引：3

作者：

He, Yan ^{[1
]}

Liu, Ziruo ^{[1
]}

Chen, Jiale ^{[1
]}

Deng, Yuehua ^{[1
]}

机构：

[1] College of Geology and Environment, Xi’an University of Science and Technology, Xi’an

来源：

Environmental Science and Pollution Research | 2024年 / 31卷 / 35期

关键词：

Adsorption; Coconut shell; Magnetic biochar; Mechanisms; Norfloxacin; Sulfadiazine;

D O I：

10.1007/s11356-024-34359-7

中图分类号：

学科分类号：

摘要：

In this study, magnetic coconut shell biochar loaded with spherical Fe3O4 and γ-Fe2O3 particles was successfully synthesized using a chemical coprecipitation method. The magnetic biochar exhibited a good magnetic separability and environmental security. The maximum sulfadiazine (SDZ) and norfloxacin (NOR) removal efficiencies were 94.8% and 92.3% at pH 4 and 25 °C with adsorbent dosage of 2.5 g/L, respectively. When antibiotic concentrations ranged from 5 to 50 mg/L, the theoretical maximum adsorption capacities of SDZ and NOR were 16.7 mg/g and 25.8 mg/g, respectively. The Langmuir isotherm and pseudo-second-order kinetic models could better describe the adsorption process of both antibiotics, implying the monolayer chemical adsorption. The thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. The ionic strength had no significant effect on the adsorption behavior of either antibiotic. Combined with BET, FTIR, and XPS results, the dominant mechanisms for SDZ and NOR adsorption were pore filling, π-π electron-donor–acceptor interaction, hydrogen bonds and surface complexation. Moreover, Lewis acid–base interaction also contributed to SDZ adsorption. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

引用

页码：48561 / 48575

页数：14

共 60 条

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