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Interactions of the Bismuthate Anion with Alkali, Alkaline Earth, Lanthanide, and Actinide Metals in Nitric Acid Systems
ACS Applied Energy Materials ( IF 6.4 ) Pub Date : 2020-01-06 00:00:00 , DOI: 10.1021/acsaem.9b02078
Jeffrey D. Einkauf 1 , Jonathan D. Burns 2
Affiliation  

The solubility, dissolution, and degradation of the bismuthate anion were studied in the presence of various metal ions. A molar extinction coefficient of the bismuthate species of 11.1 ± 0.2 L mol–1 cm–1 at 527 nm was determined through modified iodometric titration methods. The dissolution rate of solid NaBiO3 was increased in the presence of smaller cations, presumably resulting from a decrease in steric hindrance during the ion-exchange reaction with Na+. Increasing the charge of the ions in solution, however, increased the stability of BiO3 in solution, reducing the rate of degradation from Bi(V) to Bi(III) with a near linear correlation as a function of countercation charge. The presence of U(VI), as UO22+, increased the BiO3 equilibrium concentration and resulted in notable changes of the BiO3 absorbance band, indicating an interaction between the uranyl cation and bismuthate anion.

中文翻译:

铋酸根阴离子与硝酸体系中碱金属,碱土金属,镧系金属和Act系金属的相互作用

在各种金属离子的存在下,对铋酸盐阴离子的溶解度,溶解度和降解进行了研究。通过改进的碘量滴定法,测定了527 nm处的铋酸盐种类的摩尔消光系数为11.1±0.2 L mol –1 cm –1。在存在较小阳离子的情况下,固体NaBiO 3的溶解速率增加,这可能是由于与Na +进行离子交换反应过程中空间位阻的降低所致。然而,增加溶液中离子的电荷会增加BiO 3的稳定性在溶液中,可将Bi(V)降解为Bi(III)的速率降低,并且线性关系与抗衡阳离子电荷有关。U(VI)的存在下,如UO 2 2+,增加了生物3 -平衡浓度,并导致在生物的显着的变化3 -吸收带,这表明该双氧铀阳离子和阴离子铋之间的相互作用。
更新日期:2020-01-06
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