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Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Nano-size EVONIK AEROXIDE(®) P25 titanium dioxide, TiO(2), powder was heat-treated at temperatures, 700–900°C, in air. An X-ray diffraction study showed that the P25 powder is composed of approximately 20 and approximately 80 mass% of rutile and anatase phases, respectively. It was also shown that t...

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Autores principales: Ishigaki, Takamasa, Nakada, Yusuke, Tarutani, Naoki, Uchikoshi, Tetsuo, Tsujimoto, Yoshihiro, Isobe, Masaaki, Ogata, Hironori, Zhang, Chenning, Hao, Dong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7029928/
https://www.ncbi.nlm.nih.gov/pubmed/32218970
http://dx.doi.org/10.1098/rsos.191539
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author Ishigaki, Takamasa
Nakada, Yusuke
Tarutani, Naoki
Uchikoshi, Tetsuo
Tsujimoto, Yoshihiro
Isobe, Masaaki
Ogata, Hironori
Zhang, Chenning
Hao, Dong
author_facet Ishigaki, Takamasa
Nakada, Yusuke
Tarutani, Naoki
Uchikoshi, Tetsuo
Tsujimoto, Yoshihiro
Isobe, Masaaki
Ogata, Hironori
Zhang, Chenning
Hao, Dong
author_sort Ishigaki, Takamasa
collection PubMed
description Nano-size EVONIK AEROXIDE(®) P25 titanium dioxide, TiO(2), powder was heat-treated at temperatures, 700–900°C, in air. An X-ray diffraction study showed that the P25 powder is composed of approximately 20 and approximately 80 mass% of rutile and anatase phases, respectively. It was also shown that the transformation from anatase to rutile induced by high-temperature heat treatment was almost completed at 750°C, whereas a small amount (less than 3 mass%) of anatase phase was still left even in the powder heat-treated at 900°C. The transformation behaviour was consistent with results obtained by Raman scattering spectroscopy. Raman experiments also indicated that high-temperature heating induced the formation of oxide ion vacancies. Powders were dispersed in methyl orange (MO) aqueous solution, and the bleach rate of MO was measured to evaluate photocatalytic activity under ultraviolet (UV)- and visible-light irradiation. After the heat treatment, the UV-light photocatalytic performance sharply deteriorated. Interestingly, visible-light photocatalytic activity was enhanced by high-temperature heating and reached the highest performance for an 800°C-heated sample, indicating that the P25 powder obtained high visible-light photocatalytic performance after heat treatment. Even after 900°C heat treatment, the photocatalytic performance was higher than that of as-received powder. Enhancement of photocatalytic activities was discussed in relation to visible light absorption and charge carrier transfer.
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spelling pubmed-70299282020-03-26 Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment Ishigaki, Takamasa Nakada, Yusuke Tarutani, Naoki Uchikoshi, Tetsuo Tsujimoto, Yoshihiro Isobe, Masaaki Ogata, Hironori Zhang, Chenning Hao, Dong R Soc Open Sci Chemistry Nano-size EVONIK AEROXIDE(®) P25 titanium dioxide, TiO(2), powder was heat-treated at temperatures, 700–900°C, in air. An X-ray diffraction study showed that the P25 powder is composed of approximately 20 and approximately 80 mass% of rutile and anatase phases, respectively. It was also shown that the transformation from anatase to rutile induced by high-temperature heat treatment was almost completed at 750°C, whereas a small amount (less than 3 mass%) of anatase phase was still left even in the powder heat-treated at 900°C. The transformation behaviour was consistent with results obtained by Raman scattering spectroscopy. Raman experiments also indicated that high-temperature heating induced the formation of oxide ion vacancies. Powders were dispersed in methyl orange (MO) aqueous solution, and the bleach rate of MO was measured to evaluate photocatalytic activity under ultraviolet (UV)- and visible-light irradiation. After the heat treatment, the UV-light photocatalytic performance sharply deteriorated. Interestingly, visible-light photocatalytic activity was enhanced by high-temperature heating and reached the highest performance for an 800°C-heated sample, indicating that the P25 powder obtained high visible-light photocatalytic performance after heat treatment. Even after 900°C heat treatment, the photocatalytic performance was higher than that of as-received powder. Enhancement of photocatalytic activities was discussed in relation to visible light absorption and charge carrier transfer. The Royal Society 2020-01-15 /pmc/articles/PMC7029928/ /pubmed/32218970 http://dx.doi.org/10.1098/rsos.191539 Text en © 2020 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Chemistry
Ishigaki, Takamasa
Nakada, Yusuke
Tarutani, Naoki
Uchikoshi, Tetsuo
Tsujimoto, Yoshihiro
Isobe, Masaaki
Ogata, Hironori
Zhang, Chenning
Hao, Dong
Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
title Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
title_full Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
title_fullStr Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
title_full_unstemmed Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
title_short Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
title_sort enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7029928/
https://www.ncbi.nlm.nih.gov/pubmed/32218970
http://dx.doi.org/10.1098/rsos.191539
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