A rapid method of assessing the photocatalytic activity of thin TiO2 films using an ink based on the redox dye 2,6-dichloroindophenol

Andrew Mills, Mark McGrady, Jishun Wang, James Hepburn

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

An indicator ink based on the redox dye 2,6-dichloroindophenol ( DCIP) is described, which allows the rapid assessment of the activity of thin, commercial photocatalytic films, such as Activ. The ink works via a photoreductive mechanism, DCIP being reduced to dihydro-DCIP within ca. 7.5 minutes exposure to UVA irradiation of moderate intensity ( ca. 4.8mW cm(-2)). The kinetics of photoreduction are found to be independent of the level of dye present in the ink formulation, but are highly sensitive to the level of glycerol. This latter observation may be associated with a solvatochromic effect, whereby the microenvironment in which the dye finds itself and, as a consequence, its reactivity is altered significantly by small changes in the glycerol content. The kinetics of photoreduction also appear linearly dependent on the UVA light intensity with an observed quantum efficiency of ca. 1.8 x 10(-3).
LanguageEnglish
Article number504945
Number of pages6
JournalInternational Journal of Photoenergy
Volume2008
DOIs
Publication statusPublished - 2008

Fingerprint

inks
2,6-Dichloroindophenol
Ink
Dyes
dyes
glycerols
Glycerol
Thin films
photochemical reactions
Coloring Agents
thin films
Kinetics
kinetics
Quantum efficiency
luminous intensity
quantum efficiency
reactivity
Irradiation
formulations
irradiation

Keywords

  • titanium dioxide
  • surface-structure
  • photodegradation
  • indicator

Cite this

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title = "A rapid method of assessing the photocatalytic activity of thin TiO2 films using an ink based on the redox dye 2,6-dichloroindophenol",
abstract = "An indicator ink based on the redox dye 2,6-dichloroindophenol ( DCIP) is described, which allows the rapid assessment of the activity of thin, commercial photocatalytic films, such as Activ. The ink works via a photoreductive mechanism, DCIP being reduced to dihydro-DCIP within ca. 7.5 minutes exposure to UVA irradiation of moderate intensity ( ca. 4.8mW cm(-2)). The kinetics of photoreduction are found to be independent of the level of dye present in the ink formulation, but are highly sensitive to the level of glycerol. This latter observation may be associated with a solvatochromic effect, whereby the microenvironment in which the dye finds itself and, as a consequence, its reactivity is altered significantly by small changes in the glycerol content. The kinetics of photoreduction also appear linearly dependent on the UVA light intensity with an observed quantum efficiency of ca. 1.8 x 10(-3).",
keywords = "titanium dioxide, surface-structure, photodegradation, indicator",
author = "Andrew Mills and Mark McGrady and Jishun Wang and James Hepburn",
year = "2008",
doi = "10.1155/2008/504945",
language = "English",
volume = "2008",
journal = "International Journal of Photoenergy",
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A rapid method of assessing the photocatalytic activity of thin TiO2 films using an ink based on the redox dye 2,6-dichloroindophenol. / Mills, Andrew; McGrady, Mark; Wang, Jishun; Hepburn, James.

In: International Journal of Photoenergy, Vol. 2008, 504945, 2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A rapid method of assessing the photocatalytic activity of thin TiO2 films using an ink based on the redox dye 2,6-dichloroindophenol

AU - Mills, Andrew

AU - McGrady, Mark

AU - Wang, Jishun

AU - Hepburn, James

PY - 2008

Y1 - 2008

N2 - An indicator ink based on the redox dye 2,6-dichloroindophenol ( DCIP) is described, which allows the rapid assessment of the activity of thin, commercial photocatalytic films, such as Activ. The ink works via a photoreductive mechanism, DCIP being reduced to dihydro-DCIP within ca. 7.5 minutes exposure to UVA irradiation of moderate intensity ( ca. 4.8mW cm(-2)). The kinetics of photoreduction are found to be independent of the level of dye present in the ink formulation, but are highly sensitive to the level of glycerol. This latter observation may be associated with a solvatochromic effect, whereby the microenvironment in which the dye finds itself and, as a consequence, its reactivity is altered significantly by small changes in the glycerol content. The kinetics of photoreduction also appear linearly dependent on the UVA light intensity with an observed quantum efficiency of ca. 1.8 x 10(-3).

AB - An indicator ink based on the redox dye 2,6-dichloroindophenol ( DCIP) is described, which allows the rapid assessment of the activity of thin, commercial photocatalytic films, such as Activ. The ink works via a photoreductive mechanism, DCIP being reduced to dihydro-DCIP within ca. 7.5 minutes exposure to UVA irradiation of moderate intensity ( ca. 4.8mW cm(-2)). The kinetics of photoreduction are found to be independent of the level of dye present in the ink formulation, but are highly sensitive to the level of glycerol. This latter observation may be associated with a solvatochromic effect, whereby the microenvironment in which the dye finds itself and, as a consequence, its reactivity is altered significantly by small changes in the glycerol content. The kinetics of photoreduction also appear linearly dependent on the UVA light intensity with an observed quantum efficiency of ca. 1.8 x 10(-3).

KW - titanium dioxide

KW - surface-structure

KW - photodegradation

KW - indicator

U2 - 10.1155/2008/504945

DO - 10.1155/2008/504945

M3 - Article

VL - 2008

JO - International Journal of Photoenergy

T2 - International Journal of Photoenergy

JF - International Journal of Photoenergy

SN - 1110-662X

M1 - 504945

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