Abstract
The extraction chromatography–electrodeposition (EC–ED) process was proposed for the quantitative recovery of palladium from high-level liquid waste (HLLW) in this study. The process coupled the extraction chromatography method to obtain the decontamination of Pd(II) from HLLW with the electrochemical method to recover metallic palladium from the concentrated solution. Separation of Pd(II) from a nitric acid medium by extraction chromatography using isoBu-BTP/SiO2-P adsorbent and the electrochemical behavior of Pd(II) in nitric acid solution in the presence of thiourea (TU) were investigated. isoBu-BTP/SiO2-P exhibited a high selectivity for Pd(II) over other fission products (FPs), and Pd(II) could be desorbed by TU from loaded BTP/SiO2-P. The adsorbent performed good stability against HNO3 because the adsorption performance kept Pd(II) after extended contact with HNO3 solution. The column experiment achieved the separation of Pd(II) from simulated HLLW successfully. The electrochemical behavior of Pd(II) in palladium desorption solution containing TU and nitric acid was investigated at a platinum electrode by cyclic voltammetry. A weak reduction wave at − 0.4 V was due to the reduction in Pd(II) to Pd(0), and the deposition process was irreversible. In electrowinning experiments, a maximum of 92% palladium could be obtained.
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