Polyethyleneimine-Based Adsorption Techniques for Heavy Metal Removal
Summary
The contamination of water by heavy metals such as copper, cadmium, chromium and arsenic poses a significant threat to ecosystems and human health. Polyethyleneimine (PEI), a highly branched polymer bearing a dense array of primary, secondary and tertiary amine groups, has emerged as an effective modifier for a wide range of adsorbent supports. When grafted or cross-linked onto materials such as activated carbon, silica, cellulose or magnetic nanoparticles, PEI imparts strong chelation and electrostatic attraction for metal cations and oxyanions. Adsorption processes typically follow pseudo-second-order kinetics, indicating that chemisorption dominates the uptake mechanism, and equilibrium data often conform to Langmuir or Freundlich isotherms, reflecting monolayer or heterogeneous surface interactions respectively. Key advantages of PEI-based adsorbents include high removal efficiency at trace concentrations, rapid uptake rates, robustness to pH variations and facile regeneration via acid or base desorption. Magnetic PEI composites enable rapid separation by external fields, while cross-linked PEI beads and hydrogels offer high mechanical stability for column-flow applications. Collectively, these developments point to scalable, low-cost solutions for industrial effluent treatment, mine wastewater remediation and drinking-water purification on a global scale.
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Polyethyleneimine-Based Adsorption Techniques for Heavy Metal Removal publication trend
The graph below shows the total number of articles in polyethyleneimine-based adsorption techniques for heavy metal removal across all publications each year (not limited to Nature Index journals).
Technical terms
Polyethyleneimine (PEI): A branched polymer rich in amine groups used to introduce cationic charge and chelation sites on adsorbents.
Langmuir isotherm: A model describing monolayer adsorption onto a surface with a finite number of identical sites.
Freundlich isotherm: An empirical model representing adsorption on heterogeneous surfaces with varied binding energies.
Pseudo-second-order kinetics: A kinetic model implying that the rate-limiting step involves chemisorption proportional to the square of unoccupied sites.
Cross-linking: The covalent bonding of polymer chains to form a stable three-dimensional network, enhancing mechanical strength and solvent resistance.
References
- Polyethyleneimine modified activated carbon for high-efficiency adsorption of copper ion from simulated wastewater. Water Science & Technology (2022).
- Adsorption of cadmium ions from simulated battery wastewater by polyethylene polyamine-modified activated carbon. Water Science & Technology (2021).
- Enhanced Adsorption of Chromate and Arsenate Ions from Contaminated Water with Emphasis on Polyethylenimine Modified Materials: A Review. Separations (2023).
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