A calibrated UV-LED based light source for water purification and characterisation of photocatalysis

A. Sergejevs, C. T. Clarke, D. W.E. Allsopp, Javier Marugan, A Jaroenworaluck, W. Singhapong, P. Manpetch, R. Timmers, C. Casado, C. R. Bowen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Photocatalysis has a potential to become a cost effective industrial process for water cleaning. One of the most studied photocatalysts is titanium dioxide which, as a wide band gap semiconductor, requires ultraviolet (UV) light for its photoactivation. This is at the wavelengths where the efficiency of present-day light emitting diodes (LEDs) decreases rapidly, which presents a challenge in the use of UV-LEDs for commercially viable photocatalysis. There is also a need for accurate photocatalysis measurement of remediation rates of water-borne contaminants for determining optimum exposure doses in industrial applications. In response to these challenges, this paper describes a UV-LED based photocatalytic test reactor that provides a calibrated adjustable light source and pre-defined test conditions to remove as many sources of uncertainty in photocatalytic analysis as possible and thereby improve data reliability. The test reactor provides a selectable intensity of up to 1.9 kW m-2 at the photocatalyst surface. The comparability of the results is achieved through the use of pre-calibration and control electronics that minimize the largest sources of uncertainty; most notably variations in the intensity and directionality of the UV light emission of LEDs and in LED device heating.

LanguageEnglish
Pages1690-1699
Number of pages10
JournalPhotochemical & Photobiological Sciences
Volume16
Issue number11
Early online date16 Oct 2017
DOIs
StatusPublished - 1 Nov 2017

Fingerprint

water treatment
Photocatalysis
ultraviolet radiation
Purification
Light emitting diodes
Light sources
light sources
light emitting diodes
Water
Photocatalysts
reactors
electronic control
ultraviolet emission
Light emission
Remediation
titanium oxides
cleaning
water
Industrial applications
contaminants

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

A calibrated UV-LED based light source for water purification and characterisation of photocatalysis. / Sergejevs, A.; Clarke, C. T.; Allsopp, D. W.E.; Marugan, Javier; Jaroenworaluck, A; Singhapong, W.; Manpetch, P.; Timmers, R.; Casado, C.; Bowen, C. R.

In: Photochemical & Photobiological Sciences, Vol. 16, No. 11, 01.11.2017, p. 1690-1699.

Research output: Contribution to journalArticle

Sergejevs, A, Clarke, CT, Allsopp, DWE, Marugan, J, Jaroenworaluck, A, Singhapong, W, Manpetch, P, Timmers, R, Casado, C & Bowen, CR 2017, 'A calibrated UV-LED based light source for water purification and characterisation of photocatalysis', Photochemical & Photobiological Sciences, vol. 16, no. 11, pp. 1690-1699. https://doi.org/10.1039/c7pp00269f
Sergejevs, A. ; Clarke, C. T. ; Allsopp, D. W.E. ; Marugan, Javier ; Jaroenworaluck, A ; Singhapong, W. ; Manpetch, P. ; Timmers, R. ; Casado, C. ; Bowen, C. R. / A calibrated UV-LED based light source for water purification and characterisation of photocatalysis. In: Photochemical & Photobiological Sciences. 2017 ; Vol. 16, No. 11. pp. 1690-1699.
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