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

研究成果: Contribution to journalArticle査読

39 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)57-64
ページ数8
ジャーナルACS Applied Materials and Interfaces
6
1
DOI
出版ステータス出版済み - 1 8 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)

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