TY - JOUR
T1 - Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO2 Nanocrystals for Enhanced Gaseous Photocatalytic Performance
AU - Pitchaimuthu, Sudhagar
AU - Honda, Kaede
AU - Suzuki, Shoki
AU - Naito, Akane
AU - Suzuki, Norihiro
AU - Katsumata, Ken-Ichi
AU - Nakata, Kazuya
AU - Ishida, Naoya
AU - Kitamura, Naoto
AU - Idemoto, Yasushi
AU - Kondo, Takeshi
AU - Yuasa, Makoto
AU - Takai, Osamu
AU - Ueno, Tomonaga
AU - Saito, Nagahiro
AU - Fujishima, Akira
AU - Terashima, Chiaki
N1 - Funding Information:
This work was supported by the Strategic International Collaborative Research Program (SICORP) by JST. C.T. acknowledges the partial financial support from JSPS KAKENHI 26410247. The authors thank Dr. T. Ichihashi for the TEM analysis and Y. Sakurai for the XPS measurements.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/1/31
Y1 - 2018/1/31
N2 - We report a simple room-temperature synthesis route for increasing the reactivity of a TiO2 photocatalyst using a solution plasma process (SPP). Hydrogen radicals generated from the SPP chamber interact with the TiO2 photocatalyst feedstock, transforming its crystalline phase and introducing oxygen vacancy defects. In this work, we examined a pure anatase TiO2 as a model feedstock because of its photocatalytic attributes and well-characterized properties. After the SPP treatment, the pure anatase crystalline phase was transformed to an anatase/brookite heterocrystalline phase with oxygen vacancies. Furthermore, the SPP treatment promoted the absorption of both UV and visible light by TiO2. As a result, TiO2 treated by the SPP for 3 h showed a high gaseous photocatalytic performance (91.1%) for acetaldehyde degradation to CO2 compared with the activity of untreated TiO2 (51%). The SPP-treated TiO2 was also more active than nitrogen-doped TiO2 driven by visible light (66%). The overall photocatalytic performance was related to the SPP treatment time. The SPP technique could be used to enhance the activity of readily available feedstocks with a short processing time. These results demonstrate the potential of this method for modifying narrow-band gap metal oxides, metal sulfides, and polymer composite-based catalyst materials. The modifications of these materials are not limited to photocatalysts and could be used in a wide range of energy and environment-based applications.
AB - We report a simple room-temperature synthesis route for increasing the reactivity of a TiO2 photocatalyst using a solution plasma process (SPP). Hydrogen radicals generated from the SPP chamber interact with the TiO2 photocatalyst feedstock, transforming its crystalline phase and introducing oxygen vacancy defects. In this work, we examined a pure anatase TiO2 as a model feedstock because of its photocatalytic attributes and well-characterized properties. After the SPP treatment, the pure anatase crystalline phase was transformed to an anatase/brookite heterocrystalline phase with oxygen vacancies. Furthermore, the SPP treatment promoted the absorption of both UV and visible light by TiO2. As a result, TiO2 treated by the SPP for 3 h showed a high gaseous photocatalytic performance (91.1%) for acetaldehyde degradation to CO2 compared with the activity of untreated TiO2 (51%). The SPP-treated TiO2 was also more active than nitrogen-doped TiO2 driven by visible light (66%). The overall photocatalytic performance was related to the SPP treatment time. The SPP technique could be used to enhance the activity of readily available feedstocks with a short processing time. These results demonstrate the potential of this method for modifying narrow-band gap metal oxides, metal sulfides, and polymer composite-based catalyst materials. The modifications of these materials are not limited to photocatalysts and could be used in a wide range of energy and environment-based applications.
UR - http://www.scopus.com/inward/record.url?scp=85041097709&partnerID=8YFLogxK
U2 - 10.1021/acsomega.7b01698
DO - 10.1021/acsomega.7b01698
M3 - Article
AN - SCOPUS:85041097709
SN - 2470-1343
VL - 3
SP - 898
EP - 905
JO - ACS Omega
JF - ACS Omega
IS - 1
ER -