dc.contributor.author	Ehm, Clemens
dc.contributor.author	Stephan, Dietmar
dc.date.accessioned	2023-01-23T13:37:11Z
dc.date.available	2023-01-23T13:37:11Z
dc.date.issued	2022-12-12
dc.date.updated	2023-01-16T14:09:33Z
dc.description.abstract	Fluorescent tubes, a continuous source of UVA radiation, are increasingly being replaced by ultraviolet light-emitting diodes (UV LEDs or UVEDs), which emit an almost discrete spectrum (5 nm bandwidth). This creates both problems and opportunities from a photocatalytic point of view. In this paper, we report the influence of UVED radiation on the performance of an industrially produced TiO2 photocatalytic coating by measuring the degradation of nitrogen oxide (NO) and toluene (C6H5CH3) from a test atmosphere in a laboratory test setup. The influence of four commercially available UVED types (365 nm, 385 nm, 395 nm, and 415 nm) on the performance of a commonly used photocatalyst was compared. In a subsequent investigation, we switched from continuous to pulse-modulated LED operation and investigated its influence on the photocatalytic activity of the assembly. We could show that UVEDs are suitable replacements for fluorescent lamps when carefully chosen to the absorption spectrum of the used photocatalyst. In addition, the pulse width and pulse frequency modulation of the LED current show non-linear correlations with the resulting photocatalytic activity. The activity remains unexpectedly high with short pulse widths and low frequencies. By adjusting the control of the UVEDs accordingly, much energy can thus be saved during operation without reducing the catalytic activity.
dc.description.sponsorship	BMBF, 13XP5072D, KMU-innovativ - Verbundprojekt: Photokatalytisch aktive Beschichtungen auf Filtermaterialien für die Luftreinigung von schadstoffbelasteten Innenräumen (PhRIschLuft) - Teilvorhaben: Abbau durch Photokatalyse inkl. möglicher Metabolismen; Dauerhaftigkeit beschichteter Schaumstoffe; Testung von Demonstratoren
dc.description.sponsorship	TU Berlin, Open-Access-Mittel – 2022
dc.identifier.eissn	2673-7841
dc.identifier.uri	https://depositonce.tu-berlin.de/handle/11303/18046
dc.identifier.uri	https://doi.org/10.14279/depositonce-16838
dc.language.iso	en
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/
dc.subject.ddc	540 Chemie und zugeordnete Wissenschaften	de
dc.subject.other	photocatalysis
dc.subject.other	LED
dc.subject.other	UVA
dc.subject.other	TiO2
dc.subject.other	CPI
dc.subject.other	UVED
dc.subject.other	photocatalytic activity
dc.title	The influence of pulse modulated UV LEDs of different wavelengths on the photocatalytic degradation of atmospheric toluene and NO
dc.type	Article
dc.type.version	publishedVersion
dcterms.bibliographicCitation.articlenumber	1072692
dcterms.bibliographicCitation.doi	10.3389/fctls.2022.1072692
dcterms.bibliographicCitation.journaltitle	Frontiers in Catalysis
dcterms.bibliographicCitation.originalpublishername	Frontiers
dcterms.bibliographicCitation.originalpublisherplace	Lausanne
dcterms.bibliographicCitation.volume	2
dcterms.rightsHolder.reference	Creative-Commons-Lizenz
tub.accessrights.dnb	free
tub.affiliation	Fak. 6 Planen Bauen Umwelt::Inst. Bauingenieurwesen::FG Baustoffe und Bauchemie
tub.publisher.universityorinstitution	Technische Universität Berlin

The influence of pulse modulated UV LEDs of different wavelengths on the photocatalytic degradation of atmospheric toluene and NO

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