Study of uranium adsorption using amidoximated polyacrylonitrile‐encapsulated macroporous beads
Study of uranium adsorption using amidoximated polyacrylonitrile‐encapsulated macroporous beads
复制标题
DOI：
10.1002/app.37684
复制
发表时间：
2013-01
影响因子：
3
通讯作者：
K. Singh;C. Shah;C. Dwivedi;Manmohan Kumar;P. Bajaj
中科院分区：
文献类型：
--
作者：
K. Singh;C. Shah;C. Dwivedi;Manmohan Kumar;P. Bajaj
制备了含胺肟化聚丙烯腈的聚丙烯腈小球，用于铀的吸附。在不同温度和pH值条件下，考察了合成的酰胺肟化聚丙烯腈螯合珠对铀的吸附性能。动力学测量表明，约120分钟的平衡时间是足够的，从溶液中去除饱和量的铀。采用准一级和准二级动力学方程对动力学数据进行了分析，确定了反应速率常数。平衡吸附数据进行了检查的Langmuir，Freundlich和Temkin等温线。数据显示更好地拟合朗缪尔等温线。通过用稀酸处理，负载的铀也可以从珠粒中浸出。发现聚合物珠粒的铀吸收能力为3.5mg/g溶胀珠粒。还通过多次吸附-解吸实验确定了珠粒的可重复使用性。通过BET法测量的干燥珠粒的孔体积和表面积分别为1.93cc/g和320 m2/g。© 2012 Wiley Periodicals，Inc. J.应用聚合物科学，2013
Polyacrylonitrile beads, containing the amidoximated polyacrylonitrile, were prepared for adsorption of uranium. The synthesized amidoximated polyacrylonitrile chelating beads were evaluated, for their ability to adsorb uranium from aqueous solution, at different temperatures and pH values. The kinetic measurement showed that about 120 min of equilibration time was enough, to remove saturation amount of uranium from the solution. The pseudo first-order and pseudo second-order equations were used to analyze the kinetic data, and the rate constants were determined. The equilibrium adsorption data were examined by the Langmuir, Freundlich, and Temkin isotherms. The data showed a better fit to the Langmuir isotherm. The loaded uranium could also be leached out from the beads, by treating with dilute acids. The uranium uptake capacity of the polymeric beads was found to be 3.5 mg/g of the swollen beads. Reusability of the beads was also established by multiple adsorption–desorption experiments. The pore volume and the surface area of the dried beads, measured by BET method, were found to be 1.93 cc/g and 320 m2/g, respectively. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013