Rapid removal of uranium from aqueous solutions using magnetic Fe3O4@SiO2 composite particles
Rapid removal of uranium from aqueous solutions using magnetic Fe3O4@SiO2 composite particles
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利用磁性 Fe3O4@SiO2 复合颗粒快速去除水溶液中的铀
DOI：
10.1016/j.jenvrad.2011.11.003
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发表时间：
2012-04-01
影响因子：
2.3
通讯作者：
Zhao, Liang
中科院分区：
文献类型：
--
作者：
Fan, Fang-Li;Qin, Zhi;Zhao, Liang
研究了磁性Fe3O4@SiO2复合粒子作为新型吸附剂对水溶液中U（VI）的快速吸附。通过批式实验研究了初始pH、吸附剂用量、振荡时间和U（VI）初始浓度对铀吸附率和U（VI）解吸率的影响。Fe_3O_4@SiO_2复合粒子对铀的吸附具有pH依赖性，最适pH为6.0。动力学研究表明，吸附平衡时间为180 min，吸附数据符合准二级动力学模型，计算的平衡吸附量与实验结果基本一致。在20-200 mg/L浓度范围内，Langmuir吸附等温线模型与铀吸附平衡数据具有良好的相关性。磁性Fe3O4@SiO2复合颗粒上的最大铀吸附容量估计在25 ℃下约为52 mg/g。使用0.01 M HCl作为解吸剂，铀解吸达到最高值（98%）。Fe（3）o（4）@SiO2复合粒子对水溶液中的铀具有良好的选择性。本研究表明，磁性Fe3O4@SiO2复合粒子可作为一种潜在的铀吸附剂，并为水溶液中重金属离子的去除提供了一种简单、快速的分离方法。(C)2011爱思唯尔有限公司保留所有权利。
Rapid removal of U(VI) from aqueous solutions was investigated using magnetic Fe3O4@SiO2 composite particles as the novel adsorbent. Batch experiments were conducted to study the effects of initial pH, amount of adsorbent, shaking time and initial U(VI) concentrations on uranium sorption efficiency as well as the desorbing of U(VI). The sorption of uranium on Fe3O4@SiO2 composite particles was pHdependent, and the optimal pH was 6.0. In kinetics studies, the sorption equilibrium can be reached within 180 min, and the experimental data were well fitted by the pseudo-second-order model, and the equilibrium sorption capacities calculated by the model were almost the same as those determined by experiments. The Langmuir sorption isotherm model correlates well with the uranium sorption equilibrium data for the concentration range of 20-200 mg/L. The maximum uranium sorption capacity onto magnetic Fe3O4@SiO2 composite particles was estimated to be about 52 mg/g at 25 degrees C. The highest values of uranium desorption (98%) was achieved using 0.01 M HCl as the desorbing agent. Fe(3)o(4)@SiO2 composite particles showed a good selectivity for uranium from aqueous solution with other interfering cation ions. Present study suggested that magnetic Fe3O4@SiO2 composite particles can be used as a potential adsorbent for sorption uranium and also provided a simple, fast separation method for removal of heavy metal ion from aqueous solution. (C) 2011 Elsevier Ltd. All rights reserved.