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Screening tests for the evaluation of nanoparticle titania photocatalysts

Research output: Contribution to journalJournal article

Published
  • K. Thompson
  • J. Goodall
  • S. Kellici
  • J.A. Mattinson
  • T.A. Egerton
  • I. Rehman
  • J.A. Darr
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<mark>Journal publication date</mark>2009
<mark>Journal</mark>Journal of Chemical Technology and Biotechnology
Issue number11
Volume84
Number of pages9
Pages (from-to)1717-1725
Publication StatusPublished
<mark>Original language</mark>English

Abstract

BACKGROUND: Nano-sized titanium dioxide has potential as a photocatalyst, and doped variants may have different photocatalytic properties. Nano-titanias with a wide range of dopants and compositions can be prepared using continuous hydrothermal flow synthesis (CHFS), but when many samples are made, a large-scale screening test is required to investigate their properties. A range of doped nano-titanias were prepared using a CHFS route, and investigated as powders using a range of photocatalytic test methods. These tests included decolourization of methylene blue (in the presence of oxygen), partial oxidation of a simple alcohol (propan-2-ol) and the degradation of aqueous solutions of dichloroacetic acid. The practicality of the tests for large-scale screening was considered, and the test results were cross-correlated to see if any of them gave similar ranking for activity of the photocatalysts. RESULTS: Two of the tests, namely DCA degradation and propan-2-ol, gave similar rank ordering for the nanopowders, while the MB decolourization results did not suggest a strong correlation with any other test. The addition of metal dopants was observed to produce varying results between different dopants and tests. CONCLUSIONS: Two of the tests, DCA degradation and MB decolourization in visible light, were recommended for further use as screening tests. © 2009 Society of Chemical Industry.