数字农科院2.0

Iron/Zinc And Phosphoric Acid Modified Sludge Biochar As An Efficient Adsorbent For Fluoroquinolones Antibiotics Removal

文献类型: 外文期刊

作者: Zhang, Zulin;Zhang, Zulin;Gao, Feng;He, Liuyang;Li, Ping;Qi, Xuebin;Wu, Li;Ma, Yongfei;Yang, Lie

作者机构:

关键词: Sludge biochar; Iron/zinc; Phosphoric acid; Fluoroquinolones antibiotics; Water; Adsorption mechanism

期刊名称: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

ISSN: 0147-6513

年卷期: 2020 年 196 卷

页码:

摘要: Iron/zinc (Fe/Zn), phosphoric acid (H3PO4) or in combination (Fe/Zn + H3PO4) modified sludge biochar (SBC) were prepared and tested in this study to adsorb fluoroquinolones antibiotics including ciprofloxacin (CIP), norfloxacin (NOR) and ofloxacin (OFL) from water. Fe/Zn + H3PO4-SBC had an increased surface area (S-BET), total pore volume (V-tot), mesoporous volume (V-mes), pore diameter (D-p) and oxygen-containing functional groups. It exhibited superior adsorption performance for CIP, NOR and OFL with the maximum adsorption amount of 83.7, 39.3, 25.4 mg g(-1), respectively. Pseudo-second kinetic and Freundlich isotherm model presented the better fitting. The results of models and characterization analysis in combination indicated that physisorption and chemisorption, including pore filling, hydrogen bonding, pi-pi interaction, electrostatic interaction and functional groups complexation on a heterogeneous surface were the dominant process and mechanism. Liquid film diffusion was the main rate-limiting step. The adsorption process of CIP, NOR and OFL onto Fe/Zn + H3PO4-SBC were a spontaneous endothermic process. This study demonstrated that Fe/Zn + H3PO4 modified SBC exhibited high adsorption capacity, which was a promising adsorbent for fluoroquinolones as well as for other antibiotics effective removal from waters.

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