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磁性钴锰铁氧体纳米粒子对刚果红的吸附：吸附动力学、吸附等温线、热力学和电化学。

Adsorption of Congo red on magnetic cobalt-manganese ferrite nanoparticles: Adsorption kinetic, isotherm, thermodynamics, and electrochemistry.

机构信息

The People's Hospital of Danyang, Affiliated Danyang Hospital of Nantong University, Zhenjiang, P.R. China.

Zhejiang Huanke Environmental Science Research Institute Co. Ltd., Quzhou, P.R. China.

出版信息

PLoS One. 2024 Oct 9;19(10):e0307055. doi: 10.1371/journal.pone.0307055. eCollection 2024.

DOI:10.1371/journal.pone.0307055
PMID:39383192
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11463770/
Abstract

Magnetic Co0.5Mn0.5Fe2O4 nanoparticles were successfully prepared via the combustion and calcination process, with an average particle diameter of 31.5 nm and a saturation magnetization of 25.25 emu·g-1, they were employed to adsorbe Congo red (CR) from wastewater, the Pseudo-second-order kinetic and Freundlich isotherm were consistent with the adsorption data, indicating that their adsorption was a multilayer chemisorption process, the thermodynamic investigation showed that the adsorption was a favored exothermic process. The ionic strength of Cl- in CR solution had no obvious effect on the adsorption efficiency of Co0.5Mn0.5Fe2O4 nanoparticles, and the maximum adsorbance was 58.3 mg·g-1 at pH 2, decreasing as the pH of the CR solutions increased from 2 to 12. The ion leaching experiment and XRD demonstrated that Co0.5Mn0.5Fe2O4 nanoparticles had excellent stability, and the relative removal rate was 93.85% of the first time after 7 cycles. Cyclic voltammetry and electrochemical impedance spectroscopy demonstrated that CR was adsorbed onto Co0.5Mn0.5Fe2O4 nanoparticles, and the electrical conductivity of Co0.5Mn0.5Fe2O4 nanoparticles decreased after adsorption of CR. Magnetic Co0.5Mn0.5Fe2O4 nanoparticles displayed a promising application in wastewater treatment.

摘要

通过燃烧和煅烧工艺成功制备了平均粒径为 31.5nm、饱和磁化强度为 25.25emu·g-1的 Co0.5Mn0.5Fe2O4 纳米粒子，并将其用于从废水中吸附刚果红（CR）。准二级动力学和 Freundlich 等温线与吸附数据一致，表明其吸附是多层化学吸附过程。热力学研究表明，吸附是一个有利的放热过程。CR 溶液中 Cl-的离子强度对 Co0.5Mn0.5Fe2O4 纳米粒子的吸附效率没有明显影响，在 pH 值为 2 时的最大吸附量为 58.3mg·g-1，随着 CR 溶液 pH 值从 2 增加到 12，吸附量逐渐降低。离子浸出实验和 XRD 表明 Co0.5Mn0.5Fe2O4 纳米粒子具有优异的稳定性，经过 7 次循环后，其相对去除率仍为第一次的 93.85%。循环伏安法和电化学阻抗谱表明，CR 被吸附到 Co0.5Mn0.5Fe2O4 纳米粒子上，并且在 CR 吸附后 Co0.5Mn0.5Fe2O4 纳米粒子的电导率降低。磁性 Co0.5Mn0.5Fe2O4 纳米粒子在废水处理中具有广阔的应用前景。

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