Alginate-Based Adsorption Processes for Heavy Metal Removal
Summary
Alginate, a biopolymer derived primarily from brown algae, forms the basis of a versatile class of adsorbents that exploit its porous hydrogel structure and abundant carboxylate groups to capture heavy metal cations. Through ionotropic gelation with divalent cations such as calcium, sodium alginate can be shaped into beads, membranes or composite hydrogels, offering high surface area and tunable porosity. Heavy metals including lead, cadmium, copper, chromium and mercury bind via a combination of electrostatic attraction, ion exchange and chelation to guluronate and mannuronate residues. The biocompatibility, renewability and low cost of alginate make it attractive for large-scale wastewater treatment, while chemical or physical modifications—cross-linking, grafting or blending with other polymers and inorganic fillers—enhance mechanical stability, selectivity and regeneration performance. Current efforts address challenges in adsorption capacity under varying pH, rapid kinetics, sorbent recyclability and selective recovery of valuable or toxic metal ions, with applications ranging from industrial effluent polishing to remediation of mining runoff.
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Alginate-Based Adsorption Processes for Heavy Metal Removal publication trend
The graph below shows the total number of articles in alginate-based adsorption processes for heavy metal removal across all publications each year (not limited to Nature Index journals).
Technical terms
Alginate: A natural polysaccharide composed of mannuronic and guluronic acid units, capable of forming hydrogels upon ionic cross-linking.
Ionotropic gelation: The formation of a three-dimensional polymer network through ionic cross-linking by multivalent cations such as Ca²⁺.
Adsorption isotherm: A model describing the equilibrium relationship between solute concentration in solution and the amount adsorbed per unit mass of sorbent at constant temperature.
Ion exchange: A mechanism in which metal cations in solution replace counterions bound to negatively charged sites on the alginate matrix.
Chelation: The coordination of metal ions by multiple functional groups on a polymer chain, forming a stable ring-like complex.
References
- Synthesis, characterization and biocompatibility of hybrid hydrogels based on alginate, κ-carrageenan, and chitosan filled with montmorillonite clay. International Journal of Biological Macromolecules (2024).
- Fabrication and Characterization of Magnetic Cellulose–Chitosan–Alginate Composite Hydrogel Bead Bio-Sorbent. Polymers (2023).
- New derivatives of urea-grafted alginate for improving the sorption of mercury ions in aqueous solutions. Materials Research Express (2021).
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