ORCID Profile
0000-0003-1422-8754
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Publisher: Wiley
Date: 22-11-2018
Publisher: Wiley
Date: 08-09-2019
Publisher: MDPI AG
Date: 29-01-2019
DOI: 10.3390/NANO9020163
Abstract: In this report, the photocatalytic activity of P25 has been explored and the influence of thermal treatment under various atmospheres (air, vacuum and hydrogen) were discussed. The s les’ characteristics were disclosed by means of various instruments including X-ray diffraction (XRD), Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and UV–vis. This study also accentuates various states of the oxygen vacancy density formed inside the s les as well as the colour turning observed in treated P25 under various atmospheres. Produced coloured TiO2 s les were then exploited for their photocatalytic capability concerning photodegradation of methylene blue (MB) using air mass (AM) 1.5 G solar light irradiation. Our findings revealed that exceptional photocatalytic activity of P25 is related to the thermal treatment. Neither oxygen vacancy formation nor photocatalytic activity enhancement was observed in the air-treated s le. H2-treated s les have shown better photoactivity which even could be further improved by optimizing treatment conditions to achieve the advantages of the positive role of oxygen vacancy (O-vacancy at higher concentration than optimum acts as electron trapping sites). The chemical structure and stability of the s les were also studied. There was no sign of deteriorating of O2-vacancies inside the s les after 6 months. High stability of thermal treated s les in terms of both long and short-term time intervals is another significant feature of the produced photocatalyst.
Publisher: Elsevier BV
Date: 2020
No related grants have been discovered for Reza Katal.