Abstract In the present study, lanthanum modified carbon nanotubes (La-CNTs) were prepared by the impregnation method and used as adsorbents to remove oxytetracycline (OTC) from aquaculture wastewater. La-CNTs were characterized by SEM, EDS, XRD, BET analysis. The effects of adsorbent dosage, concentration of OTC, adsorption time, pH and interfering ions on the adsorption of OTC by La-CNTs were investigated. The optimum adsorbent dosage, OTC concentration, adsorption equilibrium time and pH for OTC adsorption by La-CNTs are 0.03 g, 20 mg/L, 180 min and 7, respectively. The outcome of the kinetics studies showed a significant linear correlation between the experimental results and the quasi-second-order kinetics model. As an adsorption isotherm model, the Langmuir model showed a very good consistency with the adsorption of OTC by La-CNTs, as the maximum adsorption quantity reached 117.23 mg/g. Through the thermodynamic analysis showed that the adsorption of OTC by La-CNTs was an endothermic process of entropy increase, which occurs spontaneously. The predominant forces promoting this adsorption were van der Waals force, π-π electron donor-acceptor interaction, and electrostatic interaction.

中文翻译：

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改性碳纳米管从水产养殖废水中吸附土霉素：动力学、等温线和热力学

摘要 本研究采用浸渍法制备镧改性碳纳米管（La-CNTs），并将其用作吸附剂去除水产养殖废水中的土霉素（OTC）。La-CNTs通过SEM、EDS、XRD、BET分析进行表征。研究了吸附剂用量、OTC浓度、吸附时间、pH值和干扰离子对La-CNTs吸附OTC的影响。La-CNTs吸附OTC的最佳吸附剂用量、OTC浓度、吸附平衡时间和pH分别为0.03 g、20 mg/L、180 min和7。动力学研究的结果表明实验结果与准二级动力学模型之间存在显着的线性相关性。作为吸附等温线模型，Langmuir 模型与 La-CNTs 对 OTC 的吸附表现出非常好的一致性，最大吸附量达到117.23 mg/g。通过热力学分析表明，La-CNTs对OTC的吸附是一个熵增加的吸热过程，是自发发生的。促进这种吸附的主要力量是范德华力、π-π 电子供体-受体相互作用和静电相互作用。