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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, pHpzc, 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2 2+ -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2 2+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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