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Issue 5, 2016
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Self-assembled one-dimensional MnO2@zeolitic imidazolate framework-8 nanostructures for highly efficient arsenite removal

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Abstract

Arsenite (As(III)) is more toxic and more difficult to remove from water than arsenate (As(V)). A pre-oxidation step is therefore necessary to achieve higher removal of As(III). In this work, novel one-dimensional (1D) β-MnO2@ZIF-8 nanocomposites were successfully synthesized for the first time by a facile and rapid method to achieve concurrent oxidation and adsorptive removal of As(III). In the synthesis step, the solution medium of methanol in the reaction plays a key role in reducing the interfacial energy and promotes the integration, leading to the deposition of ZIF-8 nanocrystals on β-MnO2 nanowires. The synthesized β-MnO2@ZIF-8 exhibited a high surface area of 883 m2 g−1. Batch experimental results showed that the as-obtained β-MnO2@ZIF-8 nanocomposites could oxidize As(III) to As(V), exhibiting an improved adsorptive removal of arsenite compared to the ZIF-8 bulk. The kinetic and isotherm data of As(III) adsorption on β-MnO2@ZIF-8 nanocomposites were well fitted by pseudo-second-order and Langmuir models, respectively. The maximal adsorption capacity of As(III) was 140.27 mg g−1 at room temperature. Meanwhile, the unique 1D nanostructure of β-MnO2@ZIF-8 prevented ZIF-8 agglomeration in the aqueous solution. Moreover, the β-MnO2@ZIF-8 nanowires showed excellent settleability by gravity alone and strong mechanical stability.

Graphical abstract: Self-assembled one-dimensional MnO2@zeolitic imidazolate framework-8 nanostructures for highly efficient arsenite removal

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Supplementary files

Article information


Submitted
07 Jul 2016
Accepted
26 Aug 2016
First published
26 Aug 2016

Environ. Sci.: Nano, 2016,3, 1186-1194
Article type
Paper

Self-assembled one-dimensional MnO2@zeolitic imidazolate framework-8 nanostructures for highly efficient arsenite removal

M. Jian, H. Wang, R. Liu, J. Qu, H. Wang and X. Zhang, Environ. Sci.: Nano, 2016, 3, 1186
DOI: 10.1039/C6EN00246C

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