The fabrication of 3D hierarchical flower-like δ-MnO2@COF nanocomposites for the efficient and ultra-fast removal of UO22+ ions from aqueous solution,Environmental Science: Nano

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The fabrication of 3D hierarchical flower-like δ-MnO2@COF nanocomposites for the efficient and ultra-fast removal of UO22+ ions from aqueous solution
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-10-05 , DOI: 10.1039/d0en00793e
Xin Zhong _{1,

2,

3,

4} , Zhipeng Lu _{1,

2,

3,

4} , Wen Liang _{1,

2,

3,

4} , Xiaojie Guo _{4,

5,

6,

7} , Baowei Hu _{1,

2,

3,

4}

Affiliation

Herein, interpenetrating 3D flower-like δ-MnO₂@TpPa-1 composites were suitably constructed though the integration of δ-crystal manganese dioxide (δ-MnO₂) nano-flowers with a covalent organic framework (COF, TpPa-1) via adopting a simple ultrasonication process. The physicochemical properties of δ-MnO₂@TpPa-1 were characterized via SEM, TEM-EDX, XRD, FT-IR, pH_pzc, XPS, and N₂ adsorption–desorption studies. The kinetics of UO₂²⁺-ion adsorption onto δ-MnO₂ and δ-MnO₂@TpPa-1 confirmed the existence of a pseudo-second-order model. The results of isothermal experiments showed that the Langmuir model provided a better fit, illustrating a spontaneous, endothermic, and monolayer chemisorption process for UO₂²⁺ ions onto δ-MnO₂ and δ-MnO₂@TpPa-1. The maximum adsorption levels of UO₂²⁺ ions onto δ-MnO₂ and δ-MnO₂@TpPa-1 were 499.41 mg g⁻¹ and 1147.773 mg g⁻¹, respectively, at pH 6.5 and 298 K, owing to electrostatic attraction and inner-sphere surface complexation. Oxygen-containing groups played essential roles in the formation of U–O bonds and covalent Mn–O–U bonds, making δ-MnO₂@TpPa-1 an excellent adsorbent for radionuclide elimination from solution.

中文翻译：

3D分层花状δ-MnO2@ COF纳米复合材料的制备，用于从水溶液中高效，超快地去除UO22 +离子

这里，互穿3D花状δ-的MnO ₂ @ TPPA-1复合材料适当地虽然构造δ晶二氧化锰的集成（δ-的MnO ₂）纳米花共价有机骨架（COF，TPPA-1）通过采用简单的超声处理。δ-的MnO的物理化学性质₂ @ TPPA-1进行表征通过SEM，TEM-EDX，XRD，FT-IR，pH值_PZC，XPS，和N ₂吸附-脱附研究。UO的动力学₂²⁺ -离子吸附到δ-的MnO ₂和δ-的MnO ₂@ TpPa-1确认存在伪二级模型。的等温实验结果表明，Langmuir模型提供了更好的配合，示出了用于UO一个自发的，吸热的，并且单层化学吸附过程₂²⁺到δ-MnO的离子₂和δ-的MnO ₂ @ TPPA-1。UO的最大吸附水平_2个²⁺离子到δ-的MnO ₂和δ-的MnO ₂ @ TPPA-1分别为499.41毫克克^-1和1147.773毫克克^-1由于静电吸引和内球表面络合，分别在pH 6.5和298 K下。含氧基团中的U形O键和共价的MnO-U键的形成起重要作用，使δ-的MnO ₂ @ TPPA-1用于从溶液放射性核素消除优异的吸附剂。

更新日期：2020-11-03

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