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Performance and mechanism for U(VI) adsorption in aqueous solutions with amino-modified UiO-66
Journal of Radioanalytical and Nuclear Chemistry ( IF 1.6 ) Pub Date : 2021-09-04 , DOI: 10.1007/s10967-021-07968-6
Shiyou Li 1, 2 , Yuanyuan Jin 1 , Zhongqing Hu 1 , Ying Liu 1 , Suiyi Wu 1 , Yue Wang 1 , Guohua Wang 1, 2
Affiliation  

The adsorption performance and mechanism of the amino-modified zirconium-based metal organic framework (UiO-66-NH2) for the removal of U(VI) in aqueous solution were studied. Compared with UiO-66, UiO-66-NH2 shows better adsorption performance due to the introduction of amino groups. The adsorption characteristics of factors such as pH, UiO-66-NH2 dosage and contact time were investigated. The results show that the maximum adsorption capacity is 384.6 mg g−1 at pH = 6 and T = 313 K. The adsorption conforms to the quasi-second-order kinetic model and the Langmuir isotherm model. The thermodynamic parameters indicate that the adsorption process of U(VI) is endothermic and spontaneous. After five cycles, the removal rate of U(VI) still exceeded 83.53%. The results indicate that UiO-66-NH2 is a promising adsorbent that can effectively remove U(VI) in radioactive wastewater.



中文翻译:

氨基修饰的UiO-66在水溶液中吸附U(VI)的性能和机理

研究了氨基修饰的锆基金属有机骨架(UiO-66-NH 2 )对水溶液中U(VI)的吸附性能及机理。与UiO-66相比,UiO-66-NH 2由于引入了氨基而表现出更好的吸附性能。考察了pH值、UiO-66-NH 2用量和接触时间等因素对吸附特性的影响。结果表明最大吸附量为384.6 mg g -1在 pH = 6 和 T = 313 K 下。吸附符合准二级动力学模型和 Langmuir 等温线模型。热力学参数表明U(VI)的吸附过程是吸热和自发的。五次循环后,U(VI)的去除率仍超过83.53%。结果表明,UiO-66-NH 2是一种很有前景的吸附剂,可以有效去除放射性废水中的U(VI)。

更新日期:2021-09-04
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