Esmaeili Chermahini Marzie, Ghiaci Mehran, Najafi Chermahini Alireza, Shirvani Mehran
Department of Chemistry, Isfahan University of Technology, Isfahan, 8415683111, Iran.
Department of Agriculture, Isfahan University of Technology, Isfahan, 8415683111, Iran.
Heliyon. 2024 Oct 2;10(19):e38780. doi: 10.1016/j.heliyon.2024.e38780. eCollection 2024 Oct 15.
This work demonstrates the preparation of a new, effective, and reusable magnetic adsorbent by functionalizing dopamine with ethylenediaminetetraacetic dianhydride and polymerizing it on the surface of magnetic carbon nanotubes (EDTA@PD-CNT/FeO). The adsorbent was analyzed using XRD, FT-IR, Zeta potential, FE-SEM, EDX, BET, TGA, DTA, and VSM. The synthesized adsorbent was used to remove lead and cadmium ions from aqueous solution. The adsorption process was improved by optimizing key parameters such as pH, adsorbent dosage, contact time, and ion concentration. For both ions, the thermodynamic data of the processes and adsorption kinetics were examined. Analyzing the experimental data revealed that the Langmuir isotherm was the most appropriate model, and the examination of adsorption kinetics showed a pseudo-second-order equation. The adsorption process by the EDTA@PD-CNT/FeO adsorbent was spontaneous and endothermic, according to the thermodynamic data, for Cd and Pb, the highest adsorption capacities were found to be 204.54 mg g and 376.48 mg g, respectively.
这项工作展示了一种通过用乙二胺四乙酸二酐对多巴胺进行功能化并使其在磁性碳纳米管（EDTA@PD-CNT/FeO）表面聚合来制备新型、高效且可重复使用的磁性吸附剂的方法。使用XRD、FT-IR、Zeta电位、FE-SEM、EDX、BET、TGA、DTA和VSM对该吸附剂进行了分析。合成的吸附剂用于从水溶液中去除铅和镉离子。通过优化pH、吸附剂用量、接触时间和离子浓度等关键参数来改进吸附过程。对于这两种离子，研究了过程的热力学数据和吸附动力学。对实验数据的分析表明，Langmuir等温线是最合适的模型，吸附动力学研究显示为拟二级方程。根据热力学数据，EDTA@PD-CNT/FeO吸附剂的吸附过程是自发的且吸热的，对于镉和铅，发现最高吸附容量分别为204.54 mg/g和376.48 mg/g。
