From Adsorption to Precipitation of U(VI): What is the Role of pH and Natural Organic Matter?
From Adsorption to Precipitation of U(VI): What is the Role of pH and Natural Organic Matter?
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DOI：
10.1021/acs.est.1c05429
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发表时间：
2021-12-07
影响因子：
11.4
通讯作者：
Cerrato JM
中科院分区：
文献类型：
--
作者：
Velasco CA;Brearley AJ;Gonzalez-Estrella J;Ali AS;Meza MI;Cabaniss SE;Thomson BM;Forbes TZ;Lezama Pacheco JS;Cerrato JM
在酸性和中性pH条件下，研究了苏万尼河天然有机物（NOM）存在时U（VI）的界面反应。室内批量实验表明，在pH 2和pH 4条件下，U（VI）的吸附和沉淀发生在pH 2和pH 4条件下，而在pH 7条件下，溶解的有机物有利于U的水络合，阻止了U（VI）的沉淀。光谱分析表明，pH值为4时，U（VI）主要吸附在颗粒物上。在pH值为4的条件下，电镜观察到含U（VI）的超细至纳米晶固体。研究表明，在低pH条件下，NOM促进了U（VI）的沉淀，这可能与矿化矿床、放射性废物储存库、湿地和其他富U和富有机物环境系统的形成有关。
We investigated interfacial reactions of U(VI) in the presence of Suwannee River natural organic matter (NOM) at acidic and neutral pH. Laboratory batch experiments show that the adsorption and precipitation of U(VI) in the presence of NOM occur at pH 2 and pH 4, while the aqueous complexation of U by dissolved organic matter is favored at pH 7, preventing its precipitation. Spectroscopic analyses indicate that U(VI) is mainly adsorbed to the particulate organic matter at pH 4. However, U(VI)-bearing ultrafine to nanocrystalline solids were identified at pH 4 by electron microscopy. This study shows the promotion of U(VI) precipitation by NOM at low pH which may be relevant to the formation of mineralized deposits, radioactive waste repositories, wetlands, and other U- and organic-rich environmental systems.
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影响因子：
11.4
作者：
El Hayek E;Medina S;Guo J;Noureddine A;Zychowski KE;Hunter R;Velasco CA;Wiesse M;Maestas-Olguin A;Brinker CJ;Brearley A;Spilde M;Howard T;Lauer FT;Herbert G;Ali AM;Burchiel S;Campen MJ;Cerrato JM
通讯作者：
Cerrato JM
影响因子：
8.8
作者：
Bednar, A. J.;Medina, V. F.;Larson, S. L.
通讯作者：
Larson, S. L.
影响因子：
11.4
作者：
Goldstone, JV;Pullin, MJ;Voelker, BM
通讯作者：
Voelker, BM
影响因子：
11.4
作者：
Anderson, Lindsay E.;Trueman, Benjamin F.;Gagnon, Graham A.
通讯作者：
Gagnon, Graham A.
影响因子：
8.8
作者：
Bordelet, G.;Beaucaire, C.;Descostes, M.
通讯作者：
Descostes, M.