Titania nanocoating on MnCO3 microspheres via liquid-phase deposition for fabrication of template-assisted core-shell- and hollow-structured composites

Hack Keun Lee, Daisuke Sakemi, Roman Selyanchyn, Cheal Gyu Lee, Seung Woo Lee

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A novel class of core-shell- and hollow-structured MnCO3/ TiO2 composites was synthesized by titania nanocoating on MnCO 3 microspheres via two-step liquid-phase deposition at room temperature. Morphological change from core-shell to hollow microparticles was possible in the prepared samples by controlling prereaction time of MnCO 3 and [NH4]2TiF6. Upon the prereaction process, the core of the core-shell MnCO3/TiO2 became highly porous, and a honeycomb-like surface that resembled the orientation of self-assembled MnCO3 nanocrystals was developed. The MnCO3 core was completely removed after 6 h prereaction. Calcination at 600 C resulted in the transformation of both core-shell- and hollow-structured composites to Mn2O3/TiO2 anatase microspheres that retained their original morphologies. X-ray diffraction, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and electron probe microanalysis were employed for microsphere characterization. As the first trial for application of the synthesized materials, solid-extraction of organics from aqueous media was examined using methylene blue (MB). Both types of Mn 2O3/TiO2 composites showed very fast adsorption of MB with high extraction values of 5.2 and 6.4 μmol g-1 for the core-shell and hollow structures, respectively. Current work provides a new approach for facile fabrication of titania-metal oxide nanocomposites with unique morphological features and promising application possibilities.

Original languageEnglish
Pages (from-to)57-64
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number1
DOIs
Publication statusPublished - Jan 8 2014
Externally publishedYes

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Microspheres
Titanium
Methylene Blue
Fabrication
Composite materials
Liquids
Electron probe microanalysis
Crystal orientation
Field emission
Calcination
Titanium dioxide
Nanocrystals
Oxides
Fourier transform infrared spectroscopy
Nanocomposites
Metals
Transmission electron microscopy
Adsorption
X ray diffraction
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Titania nanocoating on MnCO3 microspheres via liquid-phase deposition for fabrication of template-assisted core-shell- and hollow-structured composites. / Lee, Hack Keun; Sakemi, Daisuke; Selyanchyn, Roman; Lee, Cheal Gyu; Lee, Seung Woo.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 1, 08.01.2014, p. 57-64.

Research output: Contribution to journalArticle

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