article · RSC Advances
A nanostructured mesoporous monetite plate-like mineral, composed of calcium hydrogen phosphate, has been synthesised as an adsorbent to extract radioactive cesium ions from aqueous solutions. Developed as a low-cost and environmentally friendly material, its physical and textural characteristics were confirmed through extensive structural analysis. When tested as an ion-exchanger, the monetite material effectively captured cesium ions under alkaline conditions, specifically at levels above pH 9.0. Evaluation using kinetic and isotherm models demonstrated that the adsorbent achieves a monolayer capacity of 60.33 milligrams of cesium per gram at a pH of 9.5. These results demonstrate that mesoporous monetite provides an efficient mechanism for decontaminating water containing cesium ions.
Radioactive cesium dissolved in water presents severe health and environmental risks, requiring dependable and cost-effective methods for clean-up. Developing an inexpensive, non-toxic mineral adsorbent capable of capturing radioactive ions provides a practical foundation for safer industrial waste management and post-incident environmental remediation.
This technology could support the development of water treatment cartridges and ion-exchange columns for nuclear waste management and environmental remediation. Prospective users include nuclear facility operators, remediation contractors, and industrial effluent processors. The findings reflect early-stage laboratory research, as testing has focused on aqueous solutions without yet demonstrating performance in complex industrial wastewater.
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We report herein the fabrication of an environmentally friendly, low-cost and efficient nanostructured mesoporous monetite plate-like mineral (CaHPO<sub>4</sub>) as an adsorbent for removal of radioactive cesium ions from aqueous solutions. The phase and textural features of the synthesized mesoporous monetite were well characterized by XRD, FTIR, SEM, HRTEM, DLS, TGA/TDA, and N<sub>2</sub> adsorption/desorption techniques. The results indicate that the cesium ions were effectively adsorbed by the mesoporous monetite ion-exchanger (MMT-IEX) above pH 9.0. Different kinetic and isotherm models were applied to characterize the cesium adsorption process. The fabricated monetite exhibited a monolayer adsorption capacity up to 60.33 mg g<sup>-1</sup> at pH of 9.5. The collected data revealed the higher ability of CaHPO<sub>4</sub> for the removal of Cs(i) from aqueous media in an efficient way.
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DOI: 10.1039/c8ra02707b
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