Synthesis of nanoporous zirconium oxophosphate and application for removal of U(VI).
Synthesis of nanoporous zirconium oxophosphate and application for removal of U(VI).
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DOI：
10.1016/j.watres.2007.05.030
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发表时间：
2007-08
期刊：
影响因子：
12.8
通讯作者：
W. Um;S. Mattigod;R. Serne;G. Fryxell;Do Heui Kim;L. Troyer
中科院分区：
文献类型：
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作者：
W. Um;S. Mattigod;R. Serne;G. Fryxell;Do Heui Kim;L. Troyer
合成了均匀排列的磷酸锆纳米多孔材料，表征了其在不同背景条件（包括pH、离子强度、U（VI）浓度和碳酸盐浓度）下作为吸附剂去除NaNO3溶液中的U（VI）。批量U（VI）吸附实验结果表明，该材料对U（VI）的吸附在48 h内达到稳态，在中性pH和与大气CO2（g）封闭的条件下，所有溶解的U（VI）（10−6M）被该材料去除。U（VI）的吸附遵循传统的朗缪尔吸附等温线，从朗缪尔吸附等温线的线性区域计算的分配系数（Kd）为105，000mLg−1。由于这种含磷酸盐的纳米多孔材料表现出高的热稳定性，并具有非常高的Kd值，它可以作为一种有效的吸附剂，用于从各种污染的废物流中去除U（VI），如目前在美国能源部国防网站和拟议的地质放射性废物处置设施在尤卡山在内华达州。
Uniformly arrayed zirconium-phosphate nanoporous material was synthesized, characterized, and used as an adsorbent for removal of U(VI) in a NaNO3solution with varying background conditions including pH, ionic strength, U(VI) concentrations, and carbonate concentrations. Batch U(VI) adsorption results showed that U(VI) adsorption reached steady-state condition within 48h, and all the dissolved U(VI) (10−6M) was removed by this material at neutral pH and closed conditions to atmospheric CO2(g). The U(VI) adsorption followed a traditional Langmuir adsorption isotherm, and the distribution coefficient (Kd) calculated from the linear region of the Langmuir isotherm was 105,000mLg−1. Because this phosphate-bearing nanoporous material exhibits high thermal stability and has a very high Kdvalue, it can be applied as an efficient adsorbent for removing U(VI) from various contaminated waste streams, such as those present at the US Department of Energy defense sites and the proposed geologic radioactive waste disposal facility at Yucca Mountain in Nevada.