新型负载 Amberlite IR120 的金属氢氧化物对铀酰离子的吸附。
Uranyl ions adsorption by novel metal hydroxides loaded Amberlite IR120.
机构信息
Nuclear and Radiological Regulatory Authority, Cairo, Egypt.
Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
出版信息
J Environ Radioact. 2014 Aug;134:99-108. doi: 10.1016/j.jenvrad.2014.02.008. Epub 2014 Apr 1.
In this work, Ni(OH)2-loaded Amberlite IR120 (Ni-MA) and Co(OH)2-loaded Amberlite IR120 (Co-MA) resins were prepared, characterized and applied for UO2(2+) removal from aqueous solutions. The adsorption characteristics were investigated in a batch system with respect to effect of contact time, pH, equilibrium isotherms and removal kinetics data. The results indicated that the UO2(2+) could be efficiently removed from aqueous solutions at pH = 3.5 using Ni-MA and Co-MA resins. The maximum adsorption capacities for the UO2(2+) of Ni-MA and Co-MA were found to be 439 mg/g and 451 mg/g respectively. The equilibrium data fit well with the Langmuir adsorption isotherm. Kinetics study showed that the adsorption process was fast and reached equilibrium within 60 min and the kinetics data fit well with pseudo-second order and intra-particle diffusion models for both resins. The adsorption mechanism has been proposed and discussed. It was found that both Ni-MA and Co-MA resins could be used effectively for UO2(2+) removal from aqueous solutions.
在这项工作中，制备了负载 Ni(OH)2 的 Amberlite IR120（Ni-MA）和负载 Co(OH)2 的 Amberlite IR120（Co-MA）树脂，并对其进行了表征，用于从水溶液中去除 UO2(2+)。在批处理系统中研究了吸附特性，考察了接触时间、pH 值、平衡等温线和去除动力学数据的影响。结果表明，在 pH = 3.5 时，Ni-MA 和 Co-MA 树脂可以有效地从水溶液中去除 UO2(2+)。Ni-MA 和 Co-MA 对 UO2(2+)的最大吸附容量分别为 439mg/g 和 451mg/g。平衡数据与 Langmuir 吸附等温线拟合良好。动力学研究表明，吸附过程很快，在 60min 内达到平衡，动力学数据与两种树脂的拟二级和内扩散模型拟合良好。提出并讨论了吸附机理。结果表明，Ni-MA 和 Co-MA 树脂均可有效用于从水溶液中去除 UO2(2+)。
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