期刊
MOLECULES
卷 19, 期 11, 页码 17279-17304出版社
MDPI
DOI: 10.3390/molecules191117279
关键词
titanium dioxide; hydroxyl radical; reactive oxygen species; EPR spectroscopy; spin trapping technique; sterically hindered amines
资金
- Scientific Grant Agency of the Slovak Republic [VEGA 1/0289/12]
- Slovak University of Technology in Bratislava Young Researcher Grant
The radical intermediates formed upon UVA irradiation of titanium dioxide suspensions in aqueous and non-aqueous environments were investigated applying the EPR spin trapping technique. The results showed that the generation of reactive species and their consecutive reactions are influenced by the solvent properties (e.g., polarity, solubility of molecular oxygen, rate constant for the reaction of hydroxyl radicals with the solvent). The formation of hydroxyl radicals, evidenced as the corresponding spin-adducts, dominated in the irradiated TiO2 aqueous suspensions. The addition of O-17-enriched water caused changes in the EPR spectra reflecting the interaction of an unpaired electron with the O-17 nucleus. The photoexcitation of TiO2 in non-aqueous solvents (dimethylsulfoxide, acetonitrile, methanol and ethanol) in the presence of 5,5-dimethyl-1-pyrroline N-oxide spin trap displayed a stabilization of the superoxide radical anions generated via electron transfer reaction to molecular oxygen, and various oxygen-and carbon-centered radicals from the solvents were generated. The character and origin of the carbon-centered spin-adducts was confirmed using nitroso spin trapping agents.
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