Alginate assisted montmorillonite clay beads for malachite green adsorption: kinetics and mechanisms

IF 2.1 4区化学 Q4 CHEMISTRY, PHYSICAL

Reaction Kinetics, Mechanisms and Catalysis Pub Date : 2026-06-08 DOI:10.1007/s11144-026-03161-6

Horiya Boukhatem, Houria Rezala, Lilya Boudriche, Lila Djouadi, Amel Douba, Amira Saidani, Salah Bacha, Meriem Fizir, Hussein Khalaf, Hocine Boutoumi

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Abstract

In present study, a low-cost alginate assisted nickel oxide modified montmorillonite (Alg@NiO-Mt) or montmorillonite (Alg@Na-Mt) composite beads were prepared and utilized for the removal of malachite green (MG) cationic dye in batch mode adsorption. The prepared beads were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis/differential thermogravimetric analysis (TGA/DTG). Alg@NiO-Mt and Alg@Na-Mt beads achieved a complete removal of MG after 60 min and 90 min for a concentration of 100 mg L⁻¹ at an optimal mass of beads (1 g), natural pH of solution (3.8) and ambient temperature (25 ± 1 °C). Adsorption isotherm results showed that the Freundlich model fitted well for the adsorption of MG onto Alg@NiO-Mt and Alg@Na-Mt beads. Kinetic and thermodynamic studies also indicated that the MG adsorption were found to be well fitted with a pseudo-second order kinetic model, endothermic and spontaneous in nature. In addition, the Alg@NiO-Mt and Alg@Na-Mt beads showed excellent reusability for removal of MG after seven adsorption cycles. The adsorption of MG onto the beads is facilitated by multiple mechanisms, including electrostatic interactions, Yoshida H-bonding, dipole–dipole H-bonding, n–π interactions, and π–π interactions. Overall, the obtained results suggest that Alg@NiO-Mt and Alg@Na-Mt beads could be considered as a low-cost and eco-friendly adsorbent for MG removal from aquatic media.

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海藻酸盐辅助蒙脱土吸附孔雀石绿：动力学和机理

本研究制备了一种低成本的海藻酸盐辅助氧化镍改性蒙脱土（Alg@NiO-Mt）或蒙脱土（Alg@Na-Mt）复合微球，并将其用于间歇吸附去除孔雀石绿（MG）阳离子染料。采用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、热重/差热重分析（TGA/DTG）对制备的微球进行了表征。Alg@NiO-Mt和Alg@Na-Mt微球在最佳微球质量（1 g）、自然pH（3.8）和环境温度（25±1℃）下，在浓度为100 MG L−1的条件下，在60分钟和90分钟后完全去除MG。吸附等温线结果表明，Freundlich模型适合于MG在Alg@NiO-Mt和Alg@Na-Mt上的吸附。动力学和热力学研究也表明，MG吸附符合准二级动力学模型，具有吸热自发性质。此外，Alg@NiO-Mt和Alg@Na-Mt微球经过7次循环吸附后，对MG的去除效果良好。MG的吸附机制包括静电相互作用、吉田氢键、偶极子-偶极子氢键、n -π相互作用和π -π相互作用。总体而言，所得结果表明Alg@NiO-Mt和Alg@Na-Mt微球可以被认为是一种低成本和环保的吸附剂，用于去除水生介质中的MG。

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来源期刊

Reaction Kinetics, Mechanisms and Catalysis CHEMISTRY, PHYSICAL-

CiteScore

3.30

自引率

5.60%

发文量

201

审稿时长

2.8 months

期刊介绍： Reaction Kinetics, Mechanisms and Catalysis is a medium for original contributions in the following fields: -kinetics of homogeneous reactions in gas, liquid and solid phase; -Homogeneous catalysis; -Heterogeneous catalysis; -Adsorption in heterogeneous catalysis; -Transport processes related to reaction kinetics and catalysis; -Preparation and study of catalysts; -Reactors and apparatus. Reaction Kinetics, Mechanisms and Catalysis was formerly published under the title Reaction Kinetics and Catalysis Letters.