Highly efficient and selective extraction of uranium from aqueous solution using a magnetic device: succinyl-β-cyclodextrin-APTES@maghemite nanoparticles†,Environmental Science: Nano

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Highly efficient and selective extraction of uranium from aqueous solution using a magnetic device: succinyl-β-cyclodextrin-APTES@maghemite nanoparticles†
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-11-21 00:00:00 , DOI: 10.1039/c7en00902j
A. S. Helal _{1,

2,

3,

4,

5} , E. Mazario _{1,

2,

3,

4,

5} , A. Mayoral _{6,

7,

8} , P. Decorse _{1,

2,

3,

4,

5} , R. Losno _{2,

9,

10,

11,

12} , C. Lion _{1,

2,

3,

4,

5} , S. Ammar _{1,

2,

3,

4,

5} , M. Hémadi _{1,

2,

3,

4,

5}

Affiliation

The removal of radio-elements, notably uranium, from wastewaters is crucial for public health and environmental remediation. To this end, succinyl-β-cyclodextrin (SβCD) is grafted onto maghemite nanoparticles (NPs) synthesized by a polyol method. The nanocomposite was characterized well. The adsorption of U(VI) by SβCD-APTES@Fe₂O₃ is pH-dependent with a maximum at pH 6. Adsorption occurs mainly by complex formation and displays a very good selectivity for U(VI) compared to other cations such as Cs⁺, K⁺, Na⁺, Mg²⁺ and Al³⁺. The data were plotted according to Langmuir, Freundlich, Elovich, Temkin and Halsey isotherms. The Langmuir isotherm maximum adsorption capacity (q_max) is 286 mg U per g and higher than that of other reported sorbents. Moreover, C_s-corrected STEM visualizes uranium on the NP surface, which is consistent with the Halsey isotherm model for multilayer adsorption. The U(VI) adsorbed on SβCD-APTES@Fe₂O₃ is easily recovered by magnetic sedimentation and desorption performed in a small volume in order to concentrate the extract. The nanocomposite can be regenerated and reused at least tenfold.

中文翻译：

使用磁性装置高效地，选择性地从水溶液中萃取铀：琥珀酰-β-环糊精-APTES @磁赤铁矿纳米粒子†

从废水中去除放射性元素，特别是铀，对于公共卫生和环境修复至关重要。为此，将琥珀酰基-β-环糊精（SβCD）接枝到通过多元醇法合成的磁赤铁矿纳米颗粒（NPs）上。纳米复合材料的特性很好。SβCD-APTES@ Fe ₂ O ₃对U（VI）的吸附是pH依赖性的，在pH 6时最大。与其他阳离子（例如）相比，吸附主要通过复合物的形成发生，并且对U（VI）表现出非常好的选择性。Cs ⁺，K ⁺，Na ⁺，Mg ²⁺和Al ³⁺。根据Langmuir，Freundlich，Elovich，Temkin和Halsey等温线绘制数据。Langmuir等温线的最大吸附容量（q _max）为286 mg U / g，高于其他报道的吸附剂。此外，经C _s校正的STEM使NP表面上的铀可视化，这与用于多层吸附的Halsey等温线模型一致。吸附在SβCD-APTES@ Fe ₂ O ₃上的U（VI）易于通过磁沉降和小体积解吸来回收，以浓缩提取物。纳米复合材料可以再生和重复使用至少十倍。

更新日期：2017-11-21

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