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A new polyvinyl alcohol foam gel/MOF-808 detergent was used to study the uranium removal process on the cement surface, and the mechanism was deeply analyzed. Through the mutual verification of XPS, infrared spectrum, XRD and SEM, it is confirmed for the first time that MOF-808 mainly relies on its own Zr-OH and carboxyl groups to remove uranyl ions in foam gel, rather than the carboxyl groups on the ligand. Foam gel combined with MOF-808 can improve the decontamination factor of cement surface by 37.3%, and the maximum removal rate of uranium pollution on cement surface can reach 68.1%. [ABSTRACT FROM AUTHOR]

In this work, a foam gel material based on polyvinyl alcohol were successfully prepared to remove uranium contamination on the surface of stainless steel. The material was tested through infrared spectroscopy and thermogravimetric analysis. The decontamination process of the foam gel on stainless steel surface was analyzed by SEM/EDS and XPS. The results show that the foam gel has good stripping properties, and its decontamination factor for removal of radioactive uranium on stainless steel surfaces could reach 90.9, which seems better than the methods of water washing and wiping. [ABSTRACT FROM AUTHOR]

Extended X-ray absorption fine structure (EXAFS) spectroscopic investigation and sequential extraction were utilized to characterize the adsorption form of Cs in soil. The experimental results show that Cs+ mainly adsorbs on the surface of soil samples S1 and S2, which is a type of weak adsorption. Results of sequential extraction experiments can be directly explained with EXAFS spectra of the samples. The chemical index of weathering (CIW) of the soil has a decisive impact on the adsorption form of Cs+. The research results can provide strong support for the study of the adsorption and blocking behavior of cesium ions by the I/S mixed layer structure in soil. [ABSTRACT FROM AUTHOR]