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影响因子：12.2

DOI码：10.1021/acs.est.4c04

发表刊物：Environmental Science & Technology

摘要：Incorporation of pollutants, e.g., heavy metals, or critical elements, e.g., lithium, as impurities in mineral phases can significantly affect their mobility or sequestration in the environment. Even when present at low concentrations, impurities can alter the solubility and reactivity of the host mineral. In this study, we investigate the incorporation of trace amounts of iron (Fe3+) and chromium (Cr3+) during the crystal growth of the aluminum (Al3+) hydroxide, gibbsite, a major component of bauxite ores, an important soil mineral, and a dominant mineral phase in stored radioactive wastes. Using a comprehensive suite of analytical techniques, we show that both Cr3+ and Fe3+ can be incorporated into the gibbsite lattice during coprecipitation by replacing Al3+ in octahedral sites. These small amounts are consistent with limited to no structural isomorphism shared between Al3+ and Cr3+/Fe3+ hydroxide precipitates, nor room temperature miscibility of their isostructural M2O3 oxide forms, in contrast with oxyhydroxide forms where Al3+ and Fe3+ share similar structural topologies. Despite the limited uptake of Cr3+/Fe3+, we show that these impurities have significant implications for gibbsite dissolution behavior. The limited uptake of Cr3+/Fe3+ (e.g. 0.43% Cr3+ and 0.4% Fe3+), we show that these impurities have significant implications for gibbsite dissolution behavior and subsequent reactivity in complex environments.

合写作者：Meirong Zong, Yining Wang, Eric D Walter, Ying Chen, Zihua Zhu, Mark H Engelhard, Xiang Wang, Xiaodong Zhao, Carolyn I Pearce

第一作者：Yatong Zhao, Micah P. Prange

通讯作者：Aijun Miao, Zheming Wang, Kevin M Rosso, Xin Zhang

学科门类：工学

文献类型：J

卷号：58

期号：45

页面范围：20125-20136

是否译文：否

发表时间：2024-10-30

收录刊物：SCI

发布期刊链接：https://pubs.acs.org/doi/full/10.1021/acs.est.4c04483