A novel adsorbent magnetic functionalized m-carboxyphenyl azo calix[4]arene symmetrical sulfide derivative (Fe3O4/M-CCSSD) was fabricated by a series of simple reactions and characterized by FT-IR and SEM. The effects on U (VI) adsorption process were investigated at several conditions. The calculated data disclose that the adsorption process of U (VI) by Fe3O4/M-CCSSD is an endothermic spontaneous process, which well fits with the pseudo-second-order kinetic and Freundlich isotherm model. In the most favorable conditions, accounting for approximately 89% of U (VI) was removed. In addition, Fe3O4/M-CCSSD showed high selectivity for U (VI) and exceptional reusability.

中文翻译：

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一种新型磁性功能化间羧基苯基偶氮杯[4]芳烃对称硫化物衍生物：合成及作为选择性吸附剂去除U（VI）的应用

通过一系列简单的反应制备了一种新型吸附剂磁性功能化的间羧基苯基偶氮杯[4]芳烃对称硫化物衍生物（Fe3O4/M-CCSSD），并通过FT-IR和SEM进行了表征。在几种条件下研究了对 U (VI) 吸附过程的影响。计算数据表明，Fe3O4/M-CCSSD对U(VI)的吸附过程为吸热自发过程，与拟二级动力学模型和Freundlich等温线模型非常吻合。在最有利的条件下，约占 89% 的 U(VI) 被去除。此外，Fe3O4/M-CCSSD 对 U (VI) 表现出高选择性和出色的可重用性。