Efficient adsorption of malachite green by layered double hydroxide loaded biochar: Characterization, performance, mechanisms and soil remediation

IF 6.3 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-09-01 DOI:10.1016/j.jtice.2025.106380

Jingyuan Wang, Hongjuan Bai, Wenling Gao, Junhang Chen, Mengen Ren, Dan Liu, Qiaofei Zhang, Zhimin Du

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引用次数: 0

Abstract

Background

Malachite green (MG), a toxic dye commonly found in industrial wastewater, poses significant environmental and health risks, necessitating the development of efficient removal methods.

Methods

This study explores the efficient adsorption of MG by Mg-Al-layered double hydroxide-loaded biochar (Mg-Al-LDH/PSBC) derived from peanut shells. The adsorbent was characterized using various techniques, including SEM, FTIR, XPS, and BET analysis. Adsorption experiments were conducted to determine the maximum adsorption capacity. Isotherm and thermodynamic models, in conjunction with density functional theory (DFT) simulations, were employed to analyze the adsorption behavior and elucidate the molecular-level interactions between MG and the adsorbent materials.

Significant Findings

Batch experiments revealed a maximum adsorption capacity of 155 mg/g driven by chemisorption, ion exchange, electrostatic attraction, π-π interactions, and hydrogen bonding. The adsorption kinetics followed pseudo-first-order and pseudo-second-order models, and the isotherms were well described by the Redlich-Peterson and Koble-Corrigan models. Thermodynamic studies indicated that the adsorption was endothermic and spontaneous. DFT calculation highlighted the crucial role of the -N-CH₃ group of MG in the surface interactions. The spent adsorbent improved soil physicochemical properties, enhanced fertility, and promoted plant growth, suggesting agricultural potential. Mg-Al-LDH/PSBC thus proves to be an effective and sustainable adsorbent for MG removal.

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层状双氢氧化物负载生物炭对孔雀石绿的高效吸附：表征、性能、机理及土壤修复

孔雀石绿是工业废水中常见的一种有毒染料，对环境和健康具有重大风险，需要开发有效的去除方法。方法研究花生壳中MG - al层状双氢氧化物负载生物炭（MG - al - ldh /PSBC）对MG的高效吸附。采用SEM、FTIR、XPS和BET等多种技术对吸附剂进行了表征。通过吸附实验确定其最大吸附量。采用等温线和热力学模型，结合密度泛函理论（DFT）模拟，分析了吸附行为，阐明了MG与吸附材料之间的分子水平相互作用。批量实验表明，化学吸附、离子交换、静电吸引、π-π相互作用和氢键作用驱动的吸附量最大可达155 mg/g。吸附动力学符合准一级和准二级模型，等温线用Redlich-Peterson和Koble-Corrigan模型描述得很好。热力学研究表明，吸附是自发的吸热吸附。DFT计算强调了MG的-N-CH3基团在表面相互作用中的关键作用。废吸附剂改善了土壤理化性质，提高了肥力，促进了植物生长，具有一定的农业潜力。因此，MG - al - ldh /PSBC被证明是一种有效和可持续的MG去除吸附剂。

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

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.