Sorption of uranium(VI) from aqueous solution onto magnesium silicate hollow spheres
Sorption of uranium(VI) from aqueous solution onto magnesium silicate hollow spheres
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DOI：
10.1007/s10967-011-1091-1
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发表时间：
2011-04
影响因子：
1.6
通讯作者：
F. Fan;H. Ding;J. Bai;Xiao-lei Wu;F. Lei;Wei Tian;Yang Wang;Zhi Qin
中科院分区：
文献类型：
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作者：
F. Fan;H. Ding;J. Bai;Xiao-lei Wu;F. Lei;Wei Tian;Yang Wang;Zhi Qin
以合成的硅酸镁空心球为吸附剂，研究了其对水溶液中铀（VI）的吸附性能。通过批实验研究了初始pH值、吸附剂用量、接触时间和U（VI）初始浓度对铀吸附效率的影响。同时研究了共存离子对U（VI）解吸的影响。动力学研究表明，吸附遵循准二级动力学模型。在25 - 400 mg/L浓度范围内，朗格缪尔吸附等温线模型与铀吸附平衡数据具有良好的相关性。在实验条件下，硅酸镁空心球对铀的最大吸附量约为107 mg/g。用无机酸作解吸剂实现了铀的解吸。研究了硅酸镁空心球在高盐浓度晶间卤水中对铀（VI）的吸附性能。这项工作表明，硅酸镁空心球可以用作一种高效的吸附剂，用于从水溶液中去除铀。
The sorption of uranium(VI) from aqueous solutions was investigated using synthesized magnesium silicate hollow spheres as a novel adsorbent. Batch experiments were conducted to study the effects of initial pH, amount of adsorbent, contact time and initial U(VI) concentrations on uranium sorption efficiency. The desorbing of U(VI) and the effect of coexisting ions were also investigated. Kinetic studies showed that the sorption followed a pseudo-second-order kinetic model. The Langmuir sorption isotherm model correlates well with the uranium sorption equilibrium data for the concentration range of 25–400 mg/L. The maximum uranium sorption capacity onto magnesium silicate hollow spheres was estimated to be about 107 mg/g under the experimental conditions. Desorption of uranium was achieved using inorganic acid as the desorbing agent. The practical utility of magnesium silicate hollow spheres for U(VI) uptake was investigated with high salt concentration of intercrystalline brine. This work suggests that magnesium silicate hollow spheres can be used as a highly efficient adsorbent for removal of uranium from aqueous solutions.