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Issue 48, 2018
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Highly dispersed layered double oxide hollow spheres with sufficient active sites for adsorption of methyl blue

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Abstract

The adsorption of dyes in contaminated water is an effective approach to solving the environmental crisis. Layered double hydroxide (LDH) and its calcinated product layered double oxide (LDO) show great potential as adsorbents. However, the conventional preparation of LDH or LDO typically suffers from aggregation and blocked active sites, hampering the adsorption efficiency of the adsorbent. Herein, three-dimensional, hollow MgFe-LDO spheres were constructed through the sacrifice of a carbon template. The hollow structure and the monodisperse state provided MgFe-LDO with sufficient microchannels and abundant active sites for adsorption. Through the memory effect of LDO, the anion methyl blue (MB) can be effectively adsorbed with a high uptake capacity of 398 mg gāˆ’1. Isotherm simulations demonstrated the monolayer adsorption of MB and the heterogeneous surfaces of the reconstructed LDHs. Moreover, the adsorbents can be recycled and reutilized at least five times through magnetic separation followed by calcination. Our proposed strategy is expected to provide new possibilities for the construction of adsorbents with well-controlled architecture and abundant active sites to deal with anionic pollutants.

Graphical abstract: Highly dispersed layered double oxide hollow spheres with sufficient active sites for adsorption of methyl blue

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Publication details

The article was received on 08 Oct 2018, accepted on 19 Nov 2018 and first published on 20 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR08117D
Citation: Nanoscale, 2018,10, 23191-23197
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    Highly dispersed layered double oxide hollow spheres with sufficient active sites for adsorption of methyl blue

    Y. Zong, K. Li, R. Tian, Y. Lin and C. Lu, Nanoscale, 2018, 10, 23191
    DOI: 10.1039/C8NR08117D

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