Jump to main content
Jump to site search

Issue 5, 2016
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 07 Jul 2016, accepted on 26 Aug 2016 and first published on 26 Aug 2016


Article type: Paper
DOI: 10.1039/C6EN00246C
Citation: Environ. Sci.: Nano, 2016,3, 1186-1194
  •   Request permissions

    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

Search articles by author

Spotlight

Advertisements