Feasibility studies on the electrochemical recovery of fission platinoids from high-level liquid waste
Feasibility studies on the electrochemical recovery of fission platinoids from high-level liquid waste
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DOI：
10.1007/s10967-009-0442-7
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发表时间：
2010-01
影响因子：
1.6
通讯作者：
M. Jayakumar;K. Venkatesan;T. Srinivasan;P. Vasudeva Rao
中科院分区：
文献类型：
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作者：
M. Jayakumar;K. Venkatesan;T. Srinivasan;P. Vasudeva Rao
用循环伏安法研究了Ru(III)和Rh(III)在硝酸介质中在铂电极和不锈钢电极上的电化学行为。循环伏安图包括在−0.13áV(vs.Pd)和−0.15áV(vs.Pd)，由于Ru(III)和Rh(III)分别还原成金属形式，在−0.47áV和−0.5áV处达到峰值。在不锈钢电极上进行电沉积，与钯不同，Ru和Rh的回收率分别为~4%和~14%。然而，在从包含所有这些铂金属的三元溶液中电沉积的情况下，观察到了不同的情况。在钯的存在下，Ru和Rh的沉淀率较低，Ru和Rh的回收率分别为20%和5%。在电解含Ru(III)溶液的过程中，观察到了RuO_4在阳极上的析出和RuO_2在阳极侧的沉积。
The electrochemical behavior of ruthenium(III) and rhodium(III) in nitric acid medium has been studied at platinum and stainless steel electrodes by cyclic voltammetry. The cyclic voltammograms consisted of surge in cathodic current occurring at potentials of −0.13áV (Vs. Pd) and −0.15áV (Vs. Pd), which culminates into peaks at −0.47áV and −0.5áV due to the reductions of Ru(III) and Rh(III) to their metallic forms, respectively. Electrodeposition was carried out at stainless steel electrode and unlike palladium, the recovery of ruthenium and rhodium was limited to ~4% and ~14%, respectively. However, a different scenario was observed in case of electrodeposition from a ternary solution containing all these platinum metals. Ruthenium and rhodium deposited underpotentially in the presence of palladium and the recovery of ~20% and ~5% was observed for ruthenium and rhodium, respectively. Evolution of RuO4at the anode and deposition of RuO2in the anodic side was observed in all cases during electrolysis of ruthenium(III) containing solutions.