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Morphology-Dependent Dye-Removal Mechanism as Observed for Anatase-Titania Photocatalyst

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Abstract

Nanotubes of anatase-titania with very high specific surface-area have been synthesized via hydrothermal using the as-received powder of anatase-titania particles, having lower specific surface-area, as a precursor. Various analytical techniques have been used to characterize the as-received powder and hydrothermally processed nanotubes of anatase-titania for their morphology, size, structure, specific surface-area, pore size distribution, photoabsorption, and photoluminescence properties. The dye adsorption and photocatalytic activity of as-received powder and nanotubes of anatase-titania have been studied using the methylene blue as a model catalytic dye agent. It has been shown that, due to higher specific surface-area, the dye removal using the nanotubes of anatase-titania is primarily via surface-adsorption mechanism in the dark; while, that using the anatase-titania particles is via photocatalytic degradation mechanism under ultraviolet-radiation exposure. Hence, the mechanism of dye removal from an aqueous solution using the anatase-titania appears to be highly morphology-dependent.

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Acknowledgments

Authors thank the Department of Science and Technology (DST), India (Project # GAP 205139), and the Council of Scientific and Industrial Research (CSIR), India (Network Project # NWP0010 and Task Force Project # CMM0019) for funding the ceramic, nanotechnology, and photocatalysis research at NIIST-CSIR. Authors also thank Mr. P. Mukundan (NIIST-CSIR, India), and Mr. Narendra (Icon Analytical, India) for conducting the DR and TEM analyses.

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  1. K. V. Baiju

    Present address: Catalysis Center, Department of Civil and Environmental Engineering, Northwestern University, Sheridan Road, Evanston, IL, 60208, USA

Authors and Affiliations

  1. Ceramic Technology Department, Materials and Minerals Division (MMD), National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Industrial Estate P.O., Pappanamcode, Thiruvananthapuram, Kerala, 695019, India

    K. V. Baiju, S. Shukla & K. G. K. Warrier

  2. Chemical Sciences and Technology Division (CSTD), NIIST-CSIR, Thiruvananthapuram, Kerala, 695019, India

    S. Biju & M. L. P. Reddy

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  1. K. V. Baiju
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  2. S. Shukla
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  3. S. Biju
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  4. M. L. P. Reddy
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  5. K. G. K. Warrier
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Corresponding author

Correspondence to S. Shukla.

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Baiju, K.V., Shukla, S., Biju, S. et al. Morphology-Dependent Dye-Removal Mechanism as Observed for Anatase-Titania Photocatalyst. Catal Lett 131, 663–671 (2009). https://doi.org/10.1007/s10562-009-0010-3

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  • DOI: https://doi.org/10.1007/s10562-009-0010-3

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