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Titania-coated glass microballoons and cenospheres for environmental applications

  • Syntactic and Composite Foams
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Abstract

Functional titania coatings on glass microballoons (GMBs) and cenospheres have a broad range of potential environmental applications, primarily in purification of drinking water and treatment of industrial wastewater. The heterogeneous photocatalytic capabilities of titania films and particles have been extensively examined in the literature as effective alternatives to current technologies. Although the chemistry of titania films for photocatalysis has been studied, titania-coated GMBs have not yet been extensively considered and the materials science aspects of the titania-GMB and titania-cenosphere systems have not been addressed. We have examined the microstructure, morphology, and mechanical properties of titania coatings on both cenospheres and commercially produced GMBs. Scanning electron microscopy was used to examine coating coverage and defects. Energy dispersive X-ray spectroscopy and Raman spectroscopy were used for element and phase identification, respectively. Hardness and modulus measurements of the titania coatings and the GMB and cenosphere materials were done by nanoindentation. Additionally, the photocatalytic activity of the titania-coated GMB system was tested on Procion Red dye using two different types of mixing, a magnetic stirrer and an aeration bubbler apparatus. The titania coatings showed good coverage and retention except in the case of magnetic stirring, where significant coating loss was observed.

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Acknowledgements

The authors gratefully acknowledge support from the National Science Foundation for their Research Experience for Undergraduates program, as well as a UAB Framework for Global Health Grant, which both supported portions of this work.

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Authors and Affiliations

  1. Environmental Health Engineering Program and Department of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL, 35294, USA

    M. Koopman, K. K. Chawla, M. Lalor & M. L. Jones

  2. Trelleborg Emerson Cuming, Inc., Mansfield, MA, 02048, USA

    W. Ricci, K. Carlisle & G. M. Gladsyz

  3. Birmingham Southern University, Birmingham, AL, 35229, USA

    K. Kerr & M. P. George

  4. LADIR-CNRS, Thiais, 94320, France

    G. Gouadec & Aurélie Tournié

Authors
  1. M. Koopman
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  2. K. K. Chawla
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  3. W. Ricci
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  4. K. Carlisle
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  5. G. M. Gladsyz
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Correspondence to K. K. Chawla.

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Koopman, M., Chawla, K.K., Ricci, W. et al. Titania-coated glass microballoons and cenospheres for environmental applications. J Mater Sci 44, 1435–1441 (2009). https://doi.org/10.1007/s10853-008-2963-9

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  • DOI: https://doi.org/10.1007/s10853-008-2963-9

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