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Issue 4, 2019
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Mesoporous spinel CoFe2O4 as an efficient adsorbent for arsenite removal from water: high efficiency via control of the particle assemblage configuration

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Abstract

A 3D mesoporous network of ∼6 nm cobalt ferrite (CoFe2O4) nanoparticles (NPs), synthesized through a polymer-assisted aggregation self-assembly method, is presented. The single-phase crystallinity and high porosity of the obtained material were confirmed with X-ray diffraction, transition electron microscopy, Raman and N2 porosimetry studies. Porous CoFe2O4 assemblies, obtained after heat treatment of the hybrid networks, possess an open-pore structure with a BET surface area of 160 m2 g−1 and pores with an average size of ∼5.7 nm. Owing to its 3D network assemblage, this mesoporous CoFe2O4 exhibits an exceptional AsIII uptake capacity of 252.8 mg g−1, which is much higher than those of random CoFe2O4 NP aggregates (47.3 mg g−1) and bulk-like CoFe2O4 microparticles (43.6 mg g−1). A comprehensive surface complexation model is presented, allowing a quantitative description of the AsIII adsorption on Fe- and Co-sites. Our results indicate that the AsIII uptake can be attributed to specific [triple bond, length as m-dash]FeOH and [triple bond, length as m-dash]CoOH sites located on the outer surface and interior pore voids of the material. Confinement inside the pores is found to be responsible for strong lateral interactions among the adsorbed [H3AsO3] species. The AsIII uptake of the present CoFe2O4 material is 3 to 10-fold higher than those of other high-performance adsorbents, such as graphite oxide, ZVI/activated carbon and CoFe2O4 and NiFe2O4 nanostructures. This exemplifies that, apart from surface chemistry, fine tuning of the spatial arrangement of NPs can offer advantageous tools towards highly-efficient AsIII adsorbents.

Graphical abstract: Mesoporous spinel CoFe2O4 as an efficient adsorbent for arsenite removal from water: high efficiency via control of the particle assemblage configuration

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Publication details

The article was received on 22 Dec 2018, accepted on 11 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8EN01442F
Citation: Environ. Sci.: Nano, 2019,6, 1156-1167

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    Mesoporous spinel CoFe2O4 as an efficient adsorbent for arsenite removal from water: high efficiency via control of the particle assemblage configuration

    Y. Georgiou, I. T. Papadas, E. Mouzourakis, E. Skliri, G. S. Armatas and Y. Deligiannakis, Environ. Sci.: Nano, 2019, 6, 1156
    DOI: 10.1039/C8EN01442F

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