Abstract
Efficient removal of 137Cs from radioactive wastewater and seawater environments is of great significance to environmental protection and human health. Therefore, it is urgent to develop an adsorbent with large adsorption capacity and high adsorption efficiency. However, the development of high-performance adsorbents depends on the understanding of their adsorption mechanisms. There is currently no systematic evidence for the mechanism by which sodium cupric ferrocyanide adsorbs cesium. In this paper, the adsorption mechanism of cesium was systematically studied by the synergistic analysis of ICP-MS, Raman, FT-IR, XRD, XPS, TGA and SEM using sodium cupric ferrocyanide prepared in the laboratory. We observed for the first time that after the adsorption of cesium ions by sodium cupric ferrocyanide, the cyano band of the Raman spectrum showed a distinct Cs-CN sub-peak. At the same time, the relative intensities of the Na-CN sub-peaks decreased significantly, while those of Fe-CN and Cu-CN barely changed. This result is consistent with the results shown by ICP-MS and confirms the fact that sodium ions exchange with cesium ions. The results of XRD, XPS, TG and FT-IR confirmed that the ion exchange did not cause structural damage, which indicated that the cesium adsorption process was a pure ion exchange. In addition, we also found that 0.493% of the total amount of cesium adsorbed may be due to the contribution of defect vacancies.
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This work was supported by the Zhejiang Province Public Welfare Project (NO. LGG20E030009).
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Lv, L., Chen, C., Hou, H. et al. Structure analysis and cesium adsorption mechanism evaluation of sodium copper ferrocyanide. J Radioanal Nucl Chem 331, 5835–5842 (2022). https://doi.org/10.1007/s10967-022-08633-2
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DOI: https://doi.org/10.1007/s10967-022-08633-2