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Journal of Advanced Oxidation Technologies

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Volume 12, Issue 1

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Design of CeyCoxTi (1-x) O3+δ Perovskite for Photocatalysis: A Statistical Study

Tedi Hudaya
  • Reactor Engineering & Technology Group, School of Chemical Sciences & Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
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/ Amjad S. Qazaq
  • Reactor Engineering & Technology Group, School of Chemical Sciences & Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
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/ Frank P. Lucien
  • Reactor Engineering & Technology Group, School of Chemical Sciences & Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
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/ Adesoji A. Adesina
  • Corresponding author
  • Reactor Engineering & Technology Group, School of Chemical Sciences & Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
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Published Online: 2016-11-30 | DOI: https://doi.org/10.1515/jaots-2009-0102

Abstract

The influence of metal composition and preparation pH on the properties and photoactivity of sol-gel synthesised CeyCoxTi1-xO3+δ perovskite (0.05 ≤ x, y ≤ 0.20) has been investigated. Composite oxide samples were obtained following an orthogonal design plan and characterised using N2 adsorption, XRD, NH3-TPD, UV-diffuse reflectance and FTIR spectroscopy. Photoactivity was evaluated based on the oxidative mineralization of phydroxybenzoic acid in an internally-radiated slurry reactor at 300 K. Statistical analysis revealed that increased Co content caused a significant reduction in band-gap energy although detrimental to BET surface area. The addition of Ce improved photoactivity and the trend appeared to be closely linked to the presence of stronger acid sites in these perovskite catalysts. Preparation pH, however, has only marginal effect on the physicochemical properties and a statistically negative effect on the photoactivity. Data were fitted to multi-linear regression models which were subsequently used to obtain optimum conditions for the preparation of the perovskite for each of the key performance indices with a Ce0.05Co0.2Ti 0.8O1.875 synthesised at pH=4 emerging as the optimum recipe for photoactivity.

Keywords: photocatalysis; perovskite; sol-gel; XRD; UV-vis diffuse reflectance; FTIR; SEM; BET area; acid strength; and acid site concentration

About the article

Received: 2008-09-19

Accepted: 2008-11-22

Published Online: 2016-11-30

Published in Print: 2009-01-01


Citation Information: Journal of Advanced Oxidation Technologies, Volume 12, Issue 1, Pages 16–28, ISSN (Online) 2371-1175, ISSN (Print) 1203-8407, DOI: https://doi.org/10.1515/jaots-2009-0102.

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© 2016 by Walter de Gruyter Berlin/Boston.Get Permission

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