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

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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.

Original languageEnglish
Pages (from-to)1690-1699
Number of pages10
JournalPhotochemical & Photobiological Sciences
Volume16
Issue number11
Early online date16 Oct 2017
DOIs
Publication statusPublished - 1 Nov 2017

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Sergejevs, A., Clarke, C. T., Allsopp, D. W. E., Marugan, J., Jaroenworaluck, A., Singhapong, W., ... Bowen, C. R. (2017). A calibrated UV-LED based light source for water purification and characterisation of photocatalysis. Photochemical & Photobiological Sciences, 16(11), 1690-1699. https://doi.org/10.1039/c7pp00269f