Issue 11, 2020

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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
29 iyl 2020
Accepted
01 okt 2020
First published
05 okt 2020

Environ. Sci.: Nano, 2020,7, 3303-3317

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

X. Zhong, Z. Lu, W. Liang, X. Guo and B. Hu, Environ. Sci.: Nano, 2020, 7, 3303 DOI: 10.1039/D0EN00793E

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