Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.chemosphere.2022.135892
Title (Primary) Compound-specific isotopic analysis to characterize the photocatalytic reaction of TiO2 nanoparticles with diethyl phthalate
Author Min, N.; Yao, J.; Amde, M.; Li, H.; Pang, W.; Zhu, J.; Cao, Y.; Richnow, H.H.
Source Titel Chemosphere
Year 2022
Department ISOBIO
Volume 307, Part 4
Page From art. 135892
Language englisch
Topic T7 Bioeconomy
Keywords Compound-specific stable isotope analysis; Diethyl phthalate; Titanium dioxide nanoparticles; Hydroxyl radical; Photodegradation; Carbon and hydrogen isotopic fractionation
Abstract

In this study compound-specific isotope analysis (CSIA) has been used to explore the degradation mechanism of nano titanium dioxide (TiO2) catalyzes photodegradation of diethyl phthalate (DEP). TiO2 is a popular photosensitizer with potential in waste water treatment and application in advanced oxidation processes. The degradation process of DEP can be described with a first-order kinetics in the applied concentration ranges. The larger degradation rate constant has been found at neutral conditions. The 13C and 2H isotope fractionation associated with the nano TiO2 catalyzes photodegradation of DEP at pH 3, 7 and 11 yield normal isotope effects. In the TiO2/UV/DEP and TiO2/H2O2/UV/DEP systems, the correlation of 13C and 2H fractionation (Λ) were calculated to be 2.7 ± 0.2, 2.8 ± 0.2 at pH 3, 2.2 ± 0.4, 2.5 ± 0.2, 2.3 ± 0.6 at pH 7 and 2.6 ± 0.3, 2.2 ± 0.3, 2.7 ± 0.2 and 2.3 ± 0.3 at pH11, respectively. The dominant free radical species in studied systems were explored by combining free radical quenching method and electron paramagnetic resonance analysis. The hydroxyl radicals have been found as the main radical species at all pH conditions studied. Furthermore, the 13C and 2H fractionation suggested that the addition of •OH on the benzene ring of DEP is the main conversion pathway. Therefore, CSIA is a promising technology for the identification of reaction pathways of DEP for example in water treatment systems.

Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26551
Min, N., Yao, J., Amde, M., Li, H., Pang, W., Zhu, J., Cao, Y., Richnow, H.H. (2022):
Compound-specific isotopic analysis to characterize the photocatalytic reaction of TiO2 nanoparticles with diethyl phthalate
Chemosphere 307, Part 4 , art. 135892 10.1016/j.chemosphere.2022.135892