| 叶欣玲,李彦沙,黄铭健,潘鸿辉,刘艳,刘细祥.老化甘蔗渣生物炭-高岭土吸附左氧氟沙星的行为与机制[J].农业环境科学学报,2026,45(7):1705-1720. |
| 老化甘蔗渣生物炭-高岭土吸附左氧氟沙星的行为与机制 |
| Adsorption behavior and mechanism of levofloxacin on aged bagasse biochar-kaolin composite |
| 投稿时间：2026-02-05 |
| DOI：10.11654/jaes.2026-0143 |
| 中文关键词: 甘蔗渣 左氧氟沙星（LEV） 高岭土复合（OBC-Kao） 吸附动力学模型 动态吸附柱 |
| 英文关键词: sugarcane bagasse levofloxacin（LEV） Kaolin composite（OBC-Kao） adsorption kinetic model dynamic adsorption column |
| 基金项目:广西民族大学人才启动项目（2018KJQD08，2022KJQD29，2022KJQD32）；广西自然科学基金项目（2025GXNSFAA069248）；广西科技基地和人才专项（桂科AD23026173） |
| 作者 | 单位 | E-mail | | 叶欣玲 | 广西先进结构材料与碳中和重点实验室, 先进材料与智能制造广西高校工程研究中心, 广西民族大学材料与环境学院, 南宁 530105 | | | 李彦沙 | 广西中冠智合生态环境有限公司, 南宁 530000 | | | 黄铭健 | 广西先进结构材料与碳中和重点实验室, 先进材料与智能制造广西高校工程研究中心, 广西民族大学材料与环境学院, 南宁 530105 | | | 潘鸿辉 | 广西先进结构材料与碳中和重点实验室, 先进材料与智能制造广西高校工程研究中心, 广西民族大学材料与环境学院, 南宁 530105 | | | 刘艳 | 广西先进结构材料与碳中和重点实验室, 先进材料与智能制造广西高校工程研究中心, 广西民族大学材料与环境学院, 南宁 530105 | liuyan20020808@163.com | | 刘细祥 | 广西先进结构材料与碳中和重点实验室, 先进材料与智能制造广西高校工程研究中心, 广西民族大学材料与环境学院, 南宁 530105 | liuxx200208@163.com |
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| 中文摘要: |
| 生物炭的老化过程及其与黏土的相互作用对土壤修复效果具有重要影响，本研究旨在探究老化生物炭与高岭土的相互作用机制及土壤中左氧氟沙星（LEV）的吸附修复效果，为该类复合材料在土壤抗生素污染修复中的应用提供理论支撑。模拟自然环境中生物炭的老化过程，将氧化甘蔗渣生物炭（4%-OBC）与高岭土混合构建复合体系（OBC-Kao），通过静态吸附实验（298~318 K温度范围）、动态吸附柱实验，结合准二级动力学、Freundlich、Thomas等模型拟合，探究复合材料的吸附特性及协同机制。结果表明：高岭土纳米片可嵌入生物炭介孔形成多级传质通道，显著增大复合材料比表面积；298~318 K范围内，OBC-Kao对LEV的饱和吸附量提升至53.3~75.8 mg·g-1，吸附动力学符合准二级模型（化学吸附主导，吸附速率由颗粒内扩散和液膜扩散共同控制），Freundlich等温线模型拟合良好（多层非均相吸附特征）。协同增效源于老化生物炭表面负电荷与高岭土边缘正电荷形成的定向电场效应，及π-π电子供受体、氢键、阳离子桥接的多重作用，由此验证了二者间电荷互补-孔道互嵌的核心协同吸附机制；动态实验中，吸附柱高度增加可延长穿透时间、提升动态吸附量，流速升高可使吸附控制机制由颗粒内扩散转向外膜扩散，初始浓度增加可提升吸附总量但加剧分子竞争，Thomas模型验证了表面化学反应与传质阻力的协同控制机制，成功建立了OBC-Kao复合体系对LEV的动态吸附模型，明确了柱高、流速、初始浓度的工艺调控参数边界。 |
| 英文摘要: |
| The aging process of biochar and its interaction with clay are crucial for soil remediation efficiency. This study aims to explore the interaction mechanism between aged biochar and kaolin, as well as the adsorption remediation performance of levofloxacin（LEV）in soil, providing theoretical support for the application of such composites in antibiotic-contaminated soil remediation. The natural aging of biochar was simulated, and oxidized sugarcane bagasse biochar（4%-OBC）was mixed with kaolin to construct a composite system（OBCKao）. Static adsorption（298~318 K）, dynamic adsorption column experiments, and fitting of pseudo-second-order kinetic, Freundlich, and Thomas models were conducted to investigate the adsorption characteristics and synergistic mechanism of the composite. Kaolin nanosheets can embed into biochar mesopores to form multi-level mass transfer channels, significantly increasing the composite ′ s specific surface area. At 298-318 K, the saturated adsorption capacity of OBC-Kao for LEV reaches 53.3-75.8 mg·g-1. Adsorption kinetics follows the pseudo-second-order model, indicating dominated chemical adsorption with the rate co-controlled by intraparticle and liquid film diffusion. The Freundlich isotherm fits well, revealing multi-layer heterogeneous adsorption. The synergistic effect stems from the directed electric field formed by the negative charge on aged biochar surfaces and positive charge at kaolin edges, along with multiple interactions （π-π electron donor-acceptor, hydrogen bonding, and cation bridging）, thus verifying the core synergistic adsorption mechanism of charge complementarity-pore intercalation between the two components. In dynamic experiments, increased column height prolongs breakthrough time and enhances dynamic adsorption capacity; elevated flow rate shifts the adsorption control mechanism from intraparticle to outer membrane diffusion; higher initial concentration improves total adsorption but intensifies molecular competition. The Thomas model not only verifies the synergistic control of surface chemical reactions and mass transfer resistance, but also successfully establishes the dynamic adsorption model of the OBC-Kao composite system for LEV, and clarifies the process control parameter boundaries for column height, flow rate and initial concentration. |
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