| Autor: |
Sergejevs A; Department of Electronic and Electrical Engineering, University of Bath, Bath BA2 7AY, UK. d.allsopp@bath.ac.uk., Clarke CT, Allsopp DWE, Marugan J, Jaroenworaluck A, Singhapong W, Manpetch P, Timmers R, Casado C, Bowen CR |
| Jazyk: |
angličtina |
| Zdroj: |
Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology [Photochem Photobiol Sci] 2017 Nov 08; Vol. 16 (11), pp. 1690-1699. |
| DOI: |
10.1039/c7pp00269f |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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