Different routes of bismuth mineral transformation during pertechnetate and perrhenate uptake for subsurface remediation†

IF 3.5 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Environmental Science: Water Research & Technology Pub Date : 2024-10-03 DOI:10.1039/D4EW00496E

D. Boglaienko, M. E. Bowden, N. M. Escobedo, Q. M. Collins, A. R. Lawter, T. G. Levitskaia and C. I. Pearce

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Abstract

We investigated basic bismuth subnitrate for removal of radioactive technetium-99 as pertechnetate (⁹⁹TcO₄⁻) from contaminated groundwater. This material removed 93% of the initial concentration of ⁹⁹TcO₄⁻ within a week via formation of pH-dependent mineral phases that were identified here, but not reported previously. Perrhenate (ReO₄⁻) removal was also studied because it is a widely used non-radiological analogue for ⁹⁹TcO₄⁻, considering their similar physicochemical properties. We found that removal of ReO₄⁻ was not identical to removal of ⁹⁹TcO₄⁻ and led to formation of an additional transitional phase. This demonstrates that perrhenate and pertechnetate have different kinetics of contaminant removal as a result of variations in mineral transformation.

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过硫酸盐和过铼酸盐在地下修复过程中铋矿物转化的不同途径†。

我们研究了碱式次硝酸铋从受污染的地下水中去除放射性锝-99（全硫酸盐，99TcO4-）的方法。这种材料通过形成与 pH 值相关的矿物相，在一周内去除了 93% 的初始浓度的 99TcO4-。我们还研究了铼酸盐（ReO4-）的去除，因为考虑到它们相似的物理化学特性，铼酸盐是 99TcO4- 广泛使用的非放射性类似物。我们发现，去除 ReO4- 与去除 99TcO4- 并不完全相同，还会形成额外的过渡相。这表明，由于矿物转化的不同，过铼酸盐和过硫酸盐具有不同的污染物去除动力学。

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来源期刊

Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES

CiteScore

8.60

自引率

4.00%

发文量

206

期刊介绍： Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.