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A Power-Law Relationship between Characteristics of Light Source and Quantum Yield in Photocatalytic Systems

Shidpour, R ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.jpcc.5b02318
  3. Publisher: American Chemical Society , 2015
  4. Abstract:
  5. A new dimensionless parameter, Sh-factor, is introduced by using dimensional analysis and extending the quantum yield definition to show power-law relations among light intensity, light wavelength, distance from light source, concentrations of dye/pollutant and photocatalyst, time, and degradation percent. The Sh-factor has the same equation form for photoactivated remediation systems with particulate and thin-film photocatalysts, and it provides mathematical tools to predict degradation performance of a photocatalytic system. These power-law equations separate simply the operational parameters related to the lamp from semiconductor photocatalyst characteristics. The light scattering and absorption were also considered in Sh-factor as extended quantum yield. It was concluded that the Sh-factor could be used to model the photocatalytic system with various operational parameters. This extended quantum yield allows us to organize photocatalytic systems with thin-film photocatalysts apart from particulate photocatalysts and to compare more accurately among different photocatalytic systems
  6. Keywords:
  7. Light scattering ; Light sources ; Quantum yield ; Thin films ; Dimensional analysis ; Dimensionless parameters ; Light scattering and absorptions ; Operational parameters ; Photocatalytic systems ; Power law relationship ; Semiconductor photocatalyst ; Thin film photocatalyst ; Photocatalysts
  8. Source: Journal of Physical Chemistry C ; Volume 119, Issue 39 , July , 2015 , Pages 22425-22431 ; 19327447 (ISSN)
  9. URL: http://pubs.acs.org/doi/10.1021/acs.jpcc.5b02318