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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The EPR spectra recorded in the room temperature for defective TiO2 photocatalysts obtained in different oxidative environments, compared with pure TBT-TiO2 sample (blue line).