V. Kumar, C. Rout, J. Singh, S. Malik, A. Umar, A. A. Ibrahim, S. Baskoutas
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Enhanced heavy metal removal from contaminated soils using chelation and adsorption synergy
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.
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.
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