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. 2017 Mar 21;7:255. doi: 10.1038/s41598-017-00366-7

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© The Author(s) 2017

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(a) Methylene blue photodegradation rate constants for all the samples. Percentage of Ti₂O₃ surface states (estimated form O 1 s XPS signal) and calculated bandgaps are also listed. (b) Schematic of the interfacial charge transfer processes during illumination of Ag₂S sensitized TiO₂ nanofibers with excess Ti³⁺ states and oxygen vacancies.