Xe*-excimer lamp versus low pressure mercury vapor lamp - the comparison of the efficiency of 185 nm with 172 nm radiation, based on H202 formation and coumarin oxidation

Alapi Tünde and Farkas Luca and Scheres Firak Daniele: Xe*-excimer lamp versus low pressure mercury vapor lamp - the comparison of the efficiency of 185 nm with 172 nm radiation, based on H202 formation and coumarin oxidation.

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Abstract

VUV photolysis is a widely used method for producing high purity water by efficiently removing organic substances present in low concentrations. This process is based on the direct photolysis of water, which results in the formation of HO and H radicals. In the case of photoinitiated Advanced Oxidation Processes (AOPs), such as VUV photolysis, the lamp type determines the effectiveness. There are two types of light sources commonly used in VUV photolysis: the low-pressure mercury vapor (LPMV) lamps and the Xe* excimer lamp. In this work, the efficiency of the low-pressure mercury vapor (LPM) lamp, which emits at 254 and 185 nm (UV/VUV185 nm lamp), and the Xe* excimer lamp, which emits at 172 nm (VUV172 nm) photons, were compared. The comparison of the efficiency of the VUV light sources was based on the formation of H2O2 in the case of the pure water as well as on the transformation of coumarin (COU) and formation of its hydroxylated product, umbelliferone (7-HO-COU).

Item Type: Conference or Workshop Item
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2020
Volume: 26
ISBN: 978-963-306-771-0
Page Range: pp. 74-78
Language: English
Event Title: International Symposium on Analytical and Environmental Problems (26.) (2020) (Szeged)
Related URLs: http://acta.bibl.u-szeged.hu/73792/
Uncontrolled Keywords: Kémia
Additional Information: Bibliogr.: 78. p. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.04. Chemical sciences
Date Deposited: 2021. Nov. 16. 15:06
Last Modified: 2022. Aug. 08. 15:39
URI: http://acta.bibl.u-szeged.hu/id/eprint/73957

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