Microwave-assisted hydrothermal synthesis of manganate nanoflowers for selective retention of strontium

JOURNAL OF HAZARDOUS MATERIALS

卷:368

Article

Alby, Delhia¹  Salles, Fabrice¹  Geneste, Amine¹  Prelot, Benedicte¹  Zajac, Jerzy¹  Charnay, Clarence¹ 

[1] Univ Montpellier, Inst Charles Gerhardt Montpellier, ENSCM, CNRS,UMR 5253, Pl Eugene Bataillon, F-34095 Montpellier 5, France

关键词: Manganate nanoflowers;    Hydrothermal synthesis;    Microwave-assisted synthesis;    Adsorption selectivity;    Strontium;    Cesium Multicomponent aqueous solutions;    Radioactive remediation;   

DOI  :  10.1016/j.jhazmat.2019.01.064

来源: Elsevier

【 摘 要 】

An alternative microwave-assisted hydrothermal route for the preparation of manganate nanoflowers under basic conditions has been proposed in view of potential uses in selective retention of strontium from multi component aqueous streams. Based on the combination of such characterization techniques as Scanning and Transmission Electronic Microscopy, X-ray photoelectron spectroscopy, and X-ray Diffraction, as well as taking advantage of the computer-aided structure simulation, homogeneous nanoflower morphology possessing a layered structure and K+ compensating cations was evidenced as corresponding to the KMn4O8 chemical formula. The nanoflower sample was subsequently tested for the selective adsorption of strontium and cesium by measuring the individual adsorption isotherms from single-solute and multicomponent aqueous solutions. The material appeared selective towards strontium against cesium even in multicomponent solutions provided that the concentration of calcium remained low. This difference in the retention selectivity was rationalized based on the Density Functional Theory (DFT) calculations of the energy of adsorption and direct calorimetry measurements of the enthalpy of displacement for the individual cations.

【 授权许可】

Free