Removal of Cs⁺ from aqueous solutions by perlite

Area of Science:

• Environmental Science
• Materials Science
• Geochemistry

Background:

• Radioactive cesium (Cs+) contamination in water poses significant environmental and health risks.
• Effective and low-cost sorbent materials are needed for cesium removal from liquid effluents.
• Perlite, an abundant natural mineral, has potential for metal ion sorption but its use for Cs+ removal was unexplored.

Purpose of the Study:

• To investigate the efficacy of perlite from Salta, Argentina, for removing cesium (Cs+) from aqueous solutions.
• To characterize the perlite material and understand the factors influencing Cs+ sorption.
• To evaluate the potential of perlite as a sustainable sorbent for radioactive cesium remediation.

Main Methods:

• Perlite characterization using powder X-ray diffraction, thermal analysis, specific area analysis, and scanning electron microscopy.
• Batch experiments to study the influence of pH, concomitant ions, contact time, Cs+ concentration, and perlite dose.
• Evaluation of perlite performance before and after basic (NaOH) treatment.

Main Results:

• Perlite demonstrated significant Cs+ removal from aqueous solutions, with efficiencies reaching 84% (untreated) and 89% (NaOH-treated).
• Optimal removal was observed at high pH and after NaOH treatment.
• Sorption kinetics showed a rapid Cs+ uptake within the initial 80 minutes of contact.

Conclusions:

• Perlite is a viable and cost-effective natural material for the removal of cesium (Cs+) from contaminated waters.
• NaOH treatment enhances perlite's Cs+ sorption capacity.
• The findings support perlite's application in managing radioactive cesium isotopes in nuclear effluents and environmental water remediation.