Journal
HELIYON
Volume 9, Issue 6, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.heliyon.2023.e16975
Keywords
Cu2O; Iodine ion adsorption; Dynamic chemical plating; Cu2O deposition Rate; Cu/ag-MOR
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In this study, dynamic Cu/Ag-mordenite (Cu/Ag-MOR) material was synthesized and characterized. It was found that Cu/Ag-MOR material exhibited high selectivity for adsorbing iodine ions, with a removal rate of 99.1% in adsorption tests. Furthermore, dynamic Cu/Ag-MOR materials showed good applicability in complex situations where multiple pollutants co-exist.
Radioactive nuclides such as cesium, ruthenium, and iodine are difficult to remove in radioactive wastewater, which could be removed by coprecipitation of special chemical precipitants. In this study, dynamic Cu/Ag-mordenite (Cu/Ag-MOR) material was synthesized to be treated as the precipitant to selectively adsorb the iodine ion (I-) through controlled chemisorption combined with physical adsorption. XRD, XPS, and FTIR characterization demonstrated the successful modification of the MOR carrier surface by Cu/Ag particles and the high selectivity of the active component Cu (I) on the dynamic Cu/Ag-MOR material. SEM, TEM, and BET methods were used to characterize the Cu/Ag-MOR material, demonstrating these results: the MOR carried a stable porous structure, which allowed the silver to be well dispersed on its surface. The silver improved the copper distribution by being well-coated by the copper species. Furthermore, the analysis of the factors influencing the chemical plating of copper showed that the pH, the concentration of EDTA-2Na and the temperature all influenced the deposition rate of Cu2O. The activation energy for Cu2O deposition in dynamic Cu/Ag-MOR was 20.31 kJ/mol. The highest removal of I in the presence of dynamic Cu/Ag-MOR could reach 99.1% in the adsorption tests. The adsorption kinetics was under a proposed second-order model, with chemisorption being the controlling step of the reaction. The adsorption/desorption experiments demonstrated the reusability of the nanosorbent. It was also demonstrated that dynamic Cu/Ag-MOR materials showed good applicability in complex situations where multiple pollutants co-exist.
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