Adsorption of Uranyl ions on Amine-functionalization of MIL-101(Cr) Nanoparticles by a Facile Coordination-based Post-synthetic strategy and X-ray Absorption Spectroscopy Studies.
Adsorption of Uranyl ions on Amine-functionalization of MIL-101(Cr) Nanoparticles by a Facile Coordination-based Post-synthetic strategy and X-ray Absorption Spectroscopy Studies.
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通过基于简便配位的后合成策略和 X 射线吸收光谱研究对 MIL-101(Cr) 纳米粒子的胺官能化吸附铀酰离子
DOI：
10.1038/srep13514
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发表时间：
2015-09-10
影响因子：
4.6
通讯作者：
Li J
中科院分区：
文献类型：
--
作者：
Zhang JY;Zhang N;Zhang L;Fang Y;Deng W;Yu M;Wang Z;Li L;Liu X;Li J
通过简单的配位后合成方法，将乙二胺（艾德）的胺基接枝到配位不饱和的Cr（III）中心上，对高比表面积的MIL-101（Cr）纳米粒子进行功能化，得到了一系列ED-MIL-101（Cr）基吸附剂，并研究了其对水溶液中U（VI）的吸附性能。采用X射线粉末衍射（PXRD）、扫描电镜（SEM）、能谱（EDX）、红外光谱（FTIR）、元素分析（EA）和N2吸附-脱附等温线对不同艾德含量的ED功能化样品进行了表征。与原始的MIL-101（Cr）吸附剂相比，ED功能化的MIL-101（Cr）对水中U（VI）的吸附量显著提高，在pH为4.5，艾德/Cr为0.68时，最大吸附量可达200 mg/g（相当于100%的萃取率），且在较低pH（pH ≤ 2.0）下，吸附的U（VI）离子易于解吸。利用X射线吸收光谱（XAS）研究了MIL-101（Cr）骨架对U（VI）离子的吸附方式及接枝艾德的影响。我们相信，这项工作建立了一个简单和节能的路线，一种新型的功能材料的U（VI）离子提取溶液通过合成后修饰（PSM）策略。
By a facile coordination-based post-synthetic strategy, the high surface area MIL-101(Cr) nanoparticles was functionallized by grafting amine group of ethylenediamine (ED) on coordinatively unsaturated Cr(III) centers, yielding a series of ED-MIL-101(Cr)-based adsorbents and their application for adsorption of U(VI) from aqueous solution were also studied. The obtained ED-functionallized samples with different ED contents were characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), FTIR, elemental analysis (EA) and N2 adsorption and desorption isothermal. Compared with the pristine MIL-101(Cr) sorbents, the ED-functionallized MIL-101(Cr) exhibits significantly higher adsorption capacity for U(VI) ions from water with maximum adsorption capacities as high as 200 mg/g (corresponding to 100% extraction rate) at pH of 4.5 with ED/Cr ratio of 0.68 and the sorbed U(VI) ions can easily be desorbed at lower pH (pH ≤ 2.0). The adsorption mode of U(VI) ions and effects of grafted ED on the MIL-101(Cr) frameworks were also been studied by X-ray absorption spectroscopy (XAS). We believe that this work establishes a simple and energy efficient route to a novel type of functional materials for U(VI) ions extraction from solution via the post-synthetic modification (PSM) strategy.