Enhanced heavy metal removal from contaminated soils using chelation and adsorption synergy

IF 3.4 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Environmental Science and Technology Pub Date : 2025-07-21 DOI:10.1007/s13762-025-06592-1

V. Kumar, C. Rout, J. Singh, S. Malik, A. Umar, A. A. Ibrahim, S. Baskoutas

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引用次数: 0

Abstract

This study explores the combined efficacy of chelation and adsorption in removing heavy metal ions from contaminated soil, demonstrating a synergistic approach for effective remediation. Chelation, facilitated by citric acid, enhances the solubility and mobility of metal ions, preparing them for subsequent adsorption. Activated charcoal, used as the adsorbent, significantly reduces heavy metal concentrations in chelating wastewater. The removal efficiencies followed the trend lead(II) (Pb²⁺) > cadmium(II) (Cd²⁺) > chromium(VI) (Cr⁶⁺) > nickel(II) (Ni²⁺) > copper(II) (Cu²⁺) > zinc(II) (Zn²⁺), achieving 80%, 78%, 76%, 75%, 72%, and 68%, respectively, under optimal conditions: 0.1 M citric acid, pH 3–4, 250 rpm agitation, and 120 min contact time. Enhanced removal was observed in sandy soil compared to alluvial soil due to its lower organic content and looser structure. Additionally, citric acid demonstrated superior chelation efficiency over acetic acid due to its stronger metal complexation. This dual-method approach provides an eco-friendly and efficient strategy for mitigating soil contamination, reducing heavy metal toxicity, and minimizing environmental and health risks.

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利用螯合和吸附协同作用增强污染土壤中重金属的去除

本研究探讨了螯合和吸附联合去除污染土壤重金属离子的效果，展示了一种有效的协同修复方法。柠檬酸促进的螯合作用增强了金属离子的溶解度和迁移性，为随后的吸附做准备。活性炭作为吸附剂，可显著降低螯合废水中的重金属浓度。在0.1 M柠檬酸、pH 3-4、搅拌转速250 rpm、接触时间120 min的条件下，其去除率分别达到80%、78%、76%、75%、72%和68%，符合铅（II）（Pb2+） >、镉（II）（Cd2+） >、铬（VI）（Cr6+） >、镍（II）（Ni2+） >、铜（II）（Cu2+） >、锌（II）（Zn2+）的去除率趋势。与冲积土相比，砂质土的有机物含量较低，结构较松散，因此去除效果更好。此外，柠檬酸表现出优于乙酸的螯合效率，因为它具有更强的金属络合作用。这种双重方法为减轻土壤污染、降低重金属毒性以及最大限度地减少环境和健康风险提供了一种生态友好和有效的策略。

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来源期刊

International Journal of Environmental Science and Technology 环境科学-环境科学

CiteScore

5.60

自引率

6.50%

发文量

806

审稿时长

10.8 months

期刊介绍： International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management. A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made. The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.