Synthesis of CuFe2O4/attapulgite composite for removal of methylene blue from aqueous solutions

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-03-12 DOI:10.1016/j.colsurfa.2025.136606

Jingfeng He , Wenqi Gong , Wenbo Zhang , Lingtao Zhu , Lixiang Fu , Bin Yang

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引用次数: 0

Abstract

Attapulgite is a magnesium-aluminosilicate clay mineral with a 2:1 layered chain structure that has excellent adsorption properties. In this work, the CuFe₂O₄ were loaded on the surface of attapulgite by sol-gel method to prepare magnetic CuFe₂O₄/attapulgite composite, which was used for the removal of methylene blue. The magnetic attapulgite was characterized by XRD, FT-IR, SEM-EDS/Map, XPS, BET, and VSM, which confirmed that the CuFe₂O₄ was successfully loaded on the surface of attapulgite, with good magnetic performance. Under the optimal operating conditions, the magnetic attapulgite efficiently removed methylene blue from dye solution, in which the removal rate of methylene blue was 97.76 %. The kinetic analysis showed that chemisorption significantly impacted the adsorption rate of methylene blue by magnetic attapulgite, and the process was limited by both liquid film diffusion and intra-particle diffusion. The adsorption followed the Langmuir isotherm model, suggesting that methylene blue adsorbed to the surface of magnetic attapulgite in a near-monolayer fashion. Thermodynamic analysis revealed a negative Gibbs free energy and a standard entropy of 0.0683 kJ/(mol·K), indicating that the adsorption was spontaneous, endothermic, and driven by entropy. Meanwhile, the solution still maintained more than 90 % removal rate of methylene blue, after three cycles under the optimal conditions.

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CuFe2O4/凹凸棒石复合材料的合成及其对亚甲基蓝的去除作用

凹凸棒石是一种镁铝硅酸盐粘土矿物，具有2:1的层状链结构，具有优异的吸附性能。本文采用溶胶-凝胶法将CuFe2O4负载在凹凸棒石表面，制备了CuFe2O4/凹凸棒石磁性复合材料，用于去除亚甲基蓝。通过XRD、FT-IR、SEM-EDS/Map、XPS、BET、VSM等手段对所制备的磁性凹凸棒土进行了表征，证实CuFe2O4成功加载在凹凸棒土表面，具有良好的磁性能。在最佳操作条件下，磁性凹凸棒土对染料溶液中亚甲基蓝的去除率达到97.76 %。动力学分析表明，化学吸附显著影响磁性凹凸棒土对亚甲基蓝的吸附速率，且该过程受液膜扩散和颗粒内扩散的双重限制。吸附过程遵循Langmuir等温线模型，表明亚甲基蓝以接近单层的方式吸附在磁性凹凸棒土表面。热力学分析表明，该吸附为负的吉布斯自由能，标准熵为0.0683 kJ/(mol·K)，表明吸附是自发的吸热吸附，由熵驱动。同时，在最优条件下，经过3次循环后，溶液对亚甲基蓝的去除率仍保持在90 %以上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.