| 刘自超,任亚男,周文静,刘春晖,李孜娴,杨金康,孙齐状,王龙,赵鹏.左氧氟沙星在铁氧化物表面的吸附：动力学和pH的影响[J].农业环境科学学报,2023,42(2):362-372. |
| 左氧氟沙星在铁氧化物表面的吸附：动力学和pH的影响 |
| Effects of kinetics and pH on adsorption of levofloxacin on iron oxide surfaces |
| 投稿时间：2022-07-07 |
| DOI：10.11654/jaes.2022-0694 |
| 中文关键词: 抗生素 铁氧化物 吸附 动力学 pH 左氧氟沙星 |
| 英文关键词: antibiotics iron oxide adsorption kinetics pH levofloxacin |
| 基金项目:国家自然科学基金青年科学基金（42007103）；河南省科技攻关项目（222102110048）；河南省研究生教育改革与质量提升工程项目（HNYJS2020KC17）；河南农业大学科技创新基金（KJCX2020A18）；河南省大学生创新创业训练计划项目（202110466029） |
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| 中文摘要: |
| 通过批吸附动力学、等温吸附试验，并结合X射线光电子能谱（XPS）技术和衰减全反射-傅里叶变换红外光谱（ATRFTIR），揭示不同pH下左氧氟沙星（LEV）在铁氧化物表面的吸附机制。结果表明：溶液pH对LEV在针铁矿表面的吸附影响较大，不同pH下，其吸附动力学更符合准二级动力学模型（R2>0.98）。在pH为4时，3 h左右达到吸附平衡，而在pH为8时，12 h达到吸附平衡，并且pH为4的吸附量约是pH为8的2倍。XPS和ATR-FTIR的结果一致表明，静电作用和化学吸附是其主要吸附机制，在低pH（pH为4）时，LEV在针铁矿表面主要以单核双齿形态被吸附，在高pH（pH为8）时，主要以双核双齿形态被吸附。在中间pH （pH为6）时，由于静电排斥作用，导致其吸附量最大。 |
| 英文摘要: |
| Batch adsorption kinetics, adsorption isotherm experiments, X-ray photoelectron spectroscopy(XPS) technology, and attenuated total reflection-fourier transform infrared spectroscopy(ATR-FTIR) were used in this investigation to gain insights into the levofloxacin (LEV) adsorption process on the surface of iron oxides at various pH values. Solution pH had a significant impact on LEV adsorption, and adsorption kinetics at different pH values were a good fit for the pseudo-second-order kinetic model(R2>0.98). At pH 4, adsorption equilibrium was reached in about 3 h, whereas it took 12 h at pH 8. The total amount adsorbed at pH 4 was almost twice of that at pH 8. XPS and ATR-FTIR results consistently indicated that electrostatic interaction and chemical adsorption were the main adsorption mechanisms. LEV was mainly adsorbed in bidentate binuclear form on the goethite surface at low pH(pH<6), and bidentate binuclear at high pH (pH>8). Adsorption capacity was greatest at intermediate pH(pH=6) due to electrostatic repulsion. |
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