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Issue 16, 2015
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Ultrahigh aniline-removal capacity of hierarchically structured layered manganese oxides: trapping aniline between interlayers

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Abstract

A significant improvement in adsorption capacity and selectivity for pollutants from wastewater over adsorbents is intrinsically limited by the disordered intra-granule pores of traditional adsorbents. Herein, we propose an unprecedented strategy of trapping pollutants between the interlayers of inorganic layered materials for the high-capacity and highly selective treatment of wastewater, utilizing the interlayer gaps of layered materials containing ordered two-dimensional (2D) nanoscaled channels for intra-lattice trapping of foreign species with sizes smaller than the interlayer gaps. Using such a trapping-between-interlayers mechanism, the layered matrixes can function as “sponges”, absorbing pollutants by transforming the surface-adsorption of traditional adsorbents into bulk absorption. As a proof of concept, the trapping of toxic aniline with a diameter of 0.58 nm from alkaline aqueous solutions between interlayers of K+-preintercalated layered manganese oxides (δ-MnO2 or birnessite) with an interlayer gap of 0.73 nm via a K+/aniline exchange process is verified and rationalized by both experiments and density functional theory (DFT) simulations. An equilibrium aniline-removal capacity as high as 940.2 mg g−1 is therefore achieved over hierarchically structured Mn3O4@δ-MnO2, one order of magnitude higher than that of traditional adsorbents. The proposed and verified strategy on trapping pollutants between the interlayers of inorganic layered materials opens a new avenue towards the high-capacity and highly selective treatment of wastewater.

Graphical abstract: Ultrahigh aniline-removal capacity of hierarchically structured layered manganese oxides: trapping aniline between interlayers

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Publication details

The article was received on 17 Feb 2015, accepted on 18 Mar 2015 and first published on 18 Mar 2015


Article type: Paper
DOI: 10.1039/C5TA01305D
Citation: J. Mater. Chem. A, 2015,3, 8676-8682
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    Ultrahigh aniline-removal capacity of hierarchically structured layered manganese oxides: trapping aniline between interlayers

    W. Xiao, P. Zhou, X. Mao and D. Wang, J. Mater. Chem. A, 2015, 3, 8676
    DOI: 10.1039/C5TA01305D

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