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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3245-3256.DOI: 10.16552/j.cnki.issn1001-1625.2026.0372

• 资源综合利用 • 上一篇    下一篇

铁锰改性水稻秸秆生物炭对诺氟沙星的吸附性能及机理研究

崔亚宁(), 曲书, 王玮琦, 梁春洋, 欧晓霞()   

  1. 大连民族大学环境与资源学院,大连 116600
  • 收稿日期:2026-04-21 修订日期:2026-06-08 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 欧晓霞,博士,教授。E-mail:ouxiaoxia@dlnu.edu.cn
  • 作者简介:崔亚宁(2004—),女。主要从事环境化学的研究。E-mail:1959724082@qq.com
  • 基金资助:
    大学生创新创业训练计划国家级项目(202512026064)

Adsorption Performance and Mechanism of Norfloxacin by Fe-Mn Modified Rice Straw Biochar

CUI Yaning(), QU Shu, WANG Weiqi, LIANG Chunyang, OU Xiaoxia()   

  1. School of Environment and Resources,Dalian Minzu University,Dalian 116600,China
  • Received:2026-04-21 Revised:2026-06-08 Published:2026-09-15 Online:2026-10-09

摘要:

随着水体抗生素残留问题日益突出,开发低成本、高效且环境友好的吸附材料对诺氟沙星(NOR)等抗生素的污染治理具有重要意义。以水稻秸秆为原料制备生物炭,并通过铁、锰对生物炭进行改性,用于吸附去除水体中的NOR。通过FT-IR、XRD、SEM和BET等表征手段分析了改性前后生物炭的结构与表面性质,并系统考察了不同材料对NOR的吸附动力学、热力学特性及吸附机制。在 298 K、pH=5.2±0.1条件下进行动力学吸附试验,在 298、308、318 K及pH=5.2±0.1 条件下进行等温吸附试验。结果表明,铁锰改性生物炭(FMBC)引入了更多的金属活性位点,并呈现出高比表面积(222.23 m2/g)和以 2~10 nm为主的发达介孔结构,这有利于NOR的化学吸附。在318 K条件下,FMBC的NOR平衡吸附量最大,为69.44 mg/g。FMBC对NOR的吸附机制主要涉及孔隙填充、氢键、π-π电子供体-受体相互作用等多种物理化学机制。

关键词: 生物炭, 诺氟沙星, 铁锰改性, 水稻秸秆, 吸附

Abstract:

With the increasingly prominent problem of antibiotic residues in water, it is of great significance to develop low-cost, efficient and environmentally friendly adsorption materials for the pollution control of antibiotics such as norfloxacin (NOR). Biochar was prepared from rice straw, and modified by iron and manganese to adsorb and remove NOR in water. The structure and surface properties of biochar before and after modification were analyzed by FT-IR, XRD, SEM and BET. The adsorption kinetics, thermodynamic properties and adsorption mechanism of NOR on different materials were systematically investigated. The kinetic adsorption test was carried out at 298 K and pH=5.2±0.1, and the isothermal adsorption test was carried out at 298, 308, 318 K and pH=5.2±0.1. The results show that iron-manganese modified biochar (FMBC) introduces more metal active sites, exhibits a high specific surface area (222.23 m2/g) and develops mesoporous structure dominated by 2 nm to 10 nm, which is conducive to the chemisorption of NOR. The NOR equilibrium adsorption capacity of FMBC is the largest at 318 K condition, which is 69.44 mg/g. The adsorption mechanism of NOR on FMBC mainly involves many physical and chemical mechanisms such as pore filling, hydrogen bonding, π-π electron donor-acceptor interaction and so on.

Key words: biochar, norfloxacin, Fe-Mn modification, rice straw, adsorption

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