Microwave acid treatment induces endogenous active adsorption sites in montmorillonite for cadmium immobilization in soil

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-07-28 DOI:10.1016/j.clay.2025.107939

Zhigang Wang, Heng Deng, Yuting Gao, Sen Zhou, Feng Zhou, Guangyu Ye, Chunjie Yan

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Abstract

Cadmium (Cd) contamination poses significant environmental and health risks, particularly in soil and water systems. In response to this, this work presents a novel approach for enhancing the cadmium adsorption capacity of montmorillonite (Mt) through microwave-assisted acid treatment (MAT). This treatment selectively generates highly reactive Al(V) sites, leading to a dramatic increase in specific surface area (from 69.4 to 388.32 m²/g), porosity, and the availability of active adsorption sites. As a result, at low cadmium concentrations, 4MAT-Mt exhibits significantly improved Cd removal performance (∼99.9 % removal efficiency) compared to pristine Mt. (∼95 % removal efficiency). The adsorption process follows pseudo-second-order kinetics, indicating that chemical interactions are the primary driving force. Additionally, 4MAT-Mt demonstrates exceptional efficiency in soil remediation, effectively reducing Cd leachability (nearly 100 %) at low Cd concentrations. These findings suggest that 4MAT-Mt, with its enhanced adsorption properties, offers a promising, sustainable solution for mitigating Cd pollution in contaminated environments.

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微波酸处理诱导蒙脱土内源活性吸附位点对土壤中镉的固定作用

镉污染造成重大的环境和健康风险，特别是在土壤和水系统中。为此，本文提出了一种通过微波辅助酸处理（MAT）提高蒙脱土（Mt）对镉吸附能力的新方法。这种处理选择性地产生高活性的Al(V)位点，导致比表面积（从69.4 m2/g到388.32 m2/g）、孔隙度和活性吸附位点的可用性急剧增加。因此，在低镉浓度下，与原始Mt相比，4MAT-Mt表现出显著提高的Cd去除性能（去除率为~ 99.9%）。吸附过程遵循准二级动力学，表明化学相互作用是主要驱动力。此外，4MAT-Mt在土壤修复中表现出卓越的效率，在低Cd浓度下有效降低Cd浸出率（接近100%）。这些发现表明，具有增强吸附性能的4MAT-Mt为减轻污染环境中的镉污染提供了一种有前景的可持续解决方案。

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

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...