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• W2004429168 abstract "Low-frequency ultrasound (LFUS) irradiation induces morphological, optical and surface changes in the commercial nano-TiO2-based photocatalyst, Evonik–Degussa P-25. Low-temperature electron spin resonance (ESR) measurements performed on this material provided the first experimental evidence for the formation of oxygen vacancies (Vo), which were also found responsible for the visible-light absorption. The Vo surface defects might result from high-speed inter-particle collisions and shock waves generated by LFUS sonication impacting the TiO2 particles. This is in contrast to a number of well-established technologies, where the formation of oxygen vacancies on the TiO2 surface often requires harsh technological conditions and complicated procedures, such as annealing at high temperatures, radio-frequency-induced plasma or ion sputtering. Thus, this study reports for the first time the preparation of visible-light responsive TiO2-based photocatalysts by using a simple LFUS-based approach to induce oxygen vacancies at the nano-TiO2 surface. These findings might open new avenues for synthesis of novel nano-TiO2-based photocatalysts capable of destroying water or airborne pollutants and microorganisms under visible light illumination." @default.
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• W2004429168 date "2012-05-01" @default.
• W2004429168 modified "2023-10-09" @default.
• W2004429168 title "Low-frequency ultrasound induces oxygen vacancies formation and visible light absorption in TiO2 P-25 nanoparticles" @default.
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• W2004429168 doi "https://doi.org/10.1016/j.ultsonch.2011.11.013" @default.
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