Arsenic Adsorption Techniques in Aqueous Solutions

Arsenic contamination of groundwater and industrial effluents constitutes a widespread environmental and public health challenge. Adsorption techniques have emerged as flexible and cost-effective approaches to remove both trivalent and pentavalent arsenic species. A diverse array of adsorbents has been developed, ranging from activated carbons and metal-oxide coatings to biopolymer-based beads and advanced nanocomposites. Key parameters such as pH, temperature, contact time and adsorbent dose govern the adsorption capacity and kinetics. Mechanistic pathways include surface complexation, ion exchange and electrostatic attraction. Treatment modes span batch operations for laboratory evaluation to continuous fixed-bed columns for field deployment. Recent advances focus on low-cost precursors (agricultural residues, industrial by-products), scalable fabrication (electrospinning, solvothermal synthesis) and materials offering high selectivity, rapid uptake and facile regeneration. These innovations aim to deliver sustainable, energy-efficient solutions for global water-quality management and industrial wastewater treatment.

Research from Nature Portfolio

Recent studies have extended the toolkit of arsenic adsorbents by harnessing hybrid nanostructures. One approach employed electrospun chitosan nanofibres functionalised with iron centres, achieving rapid As(V) uptake at neutral pH and maintaining over 98 % removal across multiple regeneration cycles. Another advance combined graphene oxide with a zirconium-based metal–organic framework to yield a super-adsorbent exhibiting exceptionally high As(V) capacities under ambient conditions, with thermodynamic analyses confirming spontaneous, exothermic adsorption. These hybrid materials exemplify the integration of high surface area, tailored porosity and strong affinity for arsenic species, paving the way for robust, regenerable platforms in practical water treatment.

Arsenic Adsorption Techniques in Aqueous Solutions publication trend

The graph below shows the total number of articles in arsenic adsorption techniques in aqueous solutions across all publications each year (not limited to Nature Index journals).

Technical terms

Adsorption isotherm: Mathematical model describing the equilibrium distribution of an adsorbate between the liquid phase and the adsorbent surface (e.g. Langmuir, Freundlich).

Pseudo-second-order kinetics: Reaction rate model assuming that adsorption rate is proportional to the square of unoccupied sites, often fitting chemisorption processes.

Outer-sphere complexation: Adsorption mechanism involving electrostatic attraction without direct sharing of electrons between adsorbate and adsorbent.

Electrospinning: Fabrication technique producing continuous polymer fibres by applying a strong electric field to a polymer solution or melt.

Layered double hydroxide (LDH): Anionic clay mineral with positively charged brucite-like layers and interlayer anions, used to host and exchange contaminants.

Metal–organic framework (MOF): Highly porous crystalline material composed of metal ions or clusters coordinated to organic ligands, offering tunable pore structures.

References

1. Functionalized chitosan electrospun nanofiber for effective removal of trace arsenate from water. Scientific Reports (2016).
2. A systematic study of arsenic adsorption and removal from aqueous environments using novel graphene oxide functionalized UiO-66-NDC nanocomposites. Scientific Reports (2022).
3. Current Trends of Arsenic Adsorption in Continuous Mode: Literature Review and Future Perspectives. Sustainability (2021).
4. Multifunctional Cross-Linked Shrimp Waste-Derived Chitosan/MgAl-LDH Composite for Removal of As(V) from Wastewater and Antibacterial Activity. ACS Omega (2023).
5. Characterization and Arsenic Adsorption Behaviors of Water Treatment Residuals from Waterworks for Iron and Manganese Removal. International Journal of Environmental Research and Public Health (2019).