PROCHAZKA, Michal, Monika STUPAVSKÁ, Sona HALASZOVA, Monika JERIGOVA and Dusan VELIC. Ultraviolet photocatalytic degradation of cholesterol on TiO2: secondary ion mass spectrometry. Surface and Interface Analysis. Hoboken: Wiley, 2017, vol. 49, No 4, p. 278-283. ISSN 0142-2421. Available from: https://dx.doi.org/10.1002/sia.6129.
Other formats:   BibTeX LaTeX RIS
Basic information
Original name Ultraviolet photocatalytic degradation of cholesterol on TiO2: secondary ion mass spectrometry
Authors PROCHAZKA, Michal, Monika STUPAVSKÁ (703 Slovakia, belonging to the institution), Sona HALASZOVA, Monika JERIGOVA and Dusan VELIC.
Edition Surface and Interface Analysis, Hoboken, Wiley, 2017, 0142-2421.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10403 Physical chemistry
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW Full Text
Impact factor Impact factor: 1.263
RIV identification code RIV/00216224:14310/17:00112484
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1002/sia.6129
UT WoS 000397496800006
Keywords in English photocatalysis; titanium oxide; cholesterol; cholesterol oxidation products; secondary ion mass spectrometry
Tags rivok
Tags International impact, Reviewed
Changed by Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 16/1/2020 16:39.
Abstract
Cholesterol (C27H46O stated as M) is used as a model of bio-organic contamination, because this compound is in almost every living organism, and its photocatalytic degradation on titanium oxide (TiO2) surface with UV exposure is investigated. Secondary ion mass spectrometry as a surface-sensitive technique is suited to study this degradation process with focus on intermediates. A fragment of M-OH represents the intact molecule of cholesterol and provides its relative concentration on the surface. The intensity of M-OH decreases after 24-h UV irradiation, and the level of degradation is 89% with the pseudo-first kinetic constant of 0.0207min(-1) within 2h. A fragment of MO-H represents an intermediate as one of the cholesterol oxidation products. The irradiation from a bottom in comparison with a top reveals the differences in the mechanism of the intermediate formation through the intensity and the kinetics with values of factor of 1/3 and 30min, respectively. The roles of electrons and holes, primarily generated in TiO2 by UV, and also of superoxide anion radical and hydroxyl radical, as the secondary reactive species, are discussed to illustrate the bottom/top mechanisms.
PrintDisplayed: 31/5/2024 05:04