Adsorption Processes for Heavy Metal Ion Removal in Aqueous Solutions
Summary
Adsorption processes play a central role in the removal of heavy metal ions—such as lead, cadmium, copper and chromium—from contaminated aqueous media. These processes rely on the affinity between dissolved metal ions and the surface of solid adsorbents, which may be activated carbon, functionalised nanomaterials, biosorbents derived from agricultural or industrial waste and hybrid composites. Removal mechanisms include physisorption, chemisorption, ion exchange and surface complexation, each governed by parameters such as pH, temperature, initial ion concentration and contact time. Equilibrium is described by adsorption isotherm models—most commonly Langmuir and Freundlich—and kinetics are frequently analysed using pseudo-first-order or pseudo-second-order equations. Advances in material design have focused on increasing specific surface area, optimising pore structure and introducing tailored functional groups to enhance selectivity and capacity. The global significance of this research is underscored by stringent regulations on permissible heavy metal levels in drinking water and industrial effluents, driving practical applications from municipal treatment plants to decentralised point-of-use systems.
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Adsorption Processes for Heavy Metal Ion Removal in Aqueous Solutions publication trend
The graph below shows the total number of articles in adsorption processes for heavy metal ion removal in aqueous solutions across all publications each year (not limited to Nature Index journals).
Technical terms
Adsorption isotherm: Mathematical description of how solutes distribute between liquid phase and solid surface at equilibrium.
Chemisorption: Adsorption mechanism involving the formation of chemical bonds between adsorbate and adsorbent surface.
Physisorption: Adsorption dominated by weak van der Waals forces without chemical bond formation.
Pseudo-second-order kinetic model: Rate equation assuming adsorption rate proportional to the square of the number of unoccupied sites.
Specific surface area: Total surface area of an adsorbent per unit mass, central to its adsorption capacity.
Biosorbent: Adsorbent derived from biological sources, often agricultural or industrial biomass, used for metal uptake.
References
- Removal of lead ions (Pb2+) from water and wastewater: a review on the low-cost adsorbents. Applied Water Science (2022).
- Synthesis and Adsorption Properties of Novel Bacterial Cellulose/Graphene Oxide/Attapulgite Materials for Cu and Pb Ions in Aqueous Solutions. Materials (2020).
- Upcycling of Electroplating Sludge to Prepare Erdite-Bearing Nanorods for the Adsorption of Heavy Metals from Electroplating Wastewater Effluent. Water (2020).
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