Jump to main content
Jump to site search


Mesoporous Spinel CoFe2O4 as Efficient Adsorbent for Arsenite Removal from Water: High Efficiency via Control of Particle Assemblage Configuration

Abstract

A 3D CoFe2O4 mesoporous network of ~6nm cobalt ferrite (CoFe2O4) nanoparticles (NPs), synthesized through a polymer-assisted aggregating 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 m2g-1 and pores with average size ~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 that 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 AsIII uptake can be attributed to specific ≡FeOH and ≡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 CoFe2O4material is 3 to 10-fold higher than 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.

Back to tab navigation

Supplementary files

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, Accepted Manuscript

  •   Request permissions

    Mesoporous Spinel CoFe2O4 as Efficient Adsorbent for Arsenite Removal from Water: High Efficiency via Control of Particle Assemblage Configuration

    Y. Georgiou, I. Papadas, E. Mouzourakis, E. Skliri, G. S. Armatas and Y. DELIGIANNAKIS, Environ. Sci.: Nano, 2019, Accepted Manuscript , DOI: 10.1039/C8EN01442F

Search articles by author

Spotlight

Advertisements