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● すべて [20 records among 637] (20 hits)

■ MT4CT・2024 () ETRAPN　 Q. Xi, V. Papaefthimiou, N. Le Breton, M. Lenertz, M. Takashima, V. Keller, B. Vileno and T. Cottineau*, Influence of Nitridation Conditions on the Doping Sites and Photocatalytic Visible Light Activity of Nb,N-Codoped TiO2, Chem. Mater., published (2024). [DOI] The photocatalytic performance of Nb,N-codoped TiO2 nanoparticles obtained via the sol-gel method was compared to that of N-doped TiO2. The study focused on investigating the effects of nitridation conditions on nitrogen insertion with a highlight on the nature of the doping sites in the photocatalyst depending on the initial presence of niobium in the TiO2. The photodegradation of methylene blue in solution under UV, visible, and simulated solar light was used to evaluate the photocatalytic activity of TiO2, Nb- or N-doped TiO2, and Nb,N-codoped TiO2 nanoparticles. Codoped TiO2 produced by mild thermal nitridation exhibits the best photocatalytic activity, with a strong contribution from visible light. On the contrary, the codoped TiO2 produced by more intense thermal nitridation presents lower photocatalytic performances than TiO2 despite a small improvement of activity in the visible range. In addition to material characterization (X-ray diffraction, UV-vis spectroscopy, and X-ray photoelectron spectroscopy), electron paramagnetic resonance and reversed double-beam photoacoustic spectroscopy measurements were used to identify the respective doping sites and ultimately propose the electronic band structure for each sample of Nb:TiO2, N:TiO2, and Nb,N:TiO2. Proper thermal nitridation conditions improve the charge compensation between Nb5＋ and N3-, thereby enhancing the photocatalytic activity. However, too intense nitridation conditions led to the generation of oxygen vacancies and a large amount of Ti3＋ acting as charge recombination centers, resulting in significant deterioration of the photocatalytic performances. This study highlights the importance of understanding the intricate charge compensation process in codoped (M,N) TiO2 materials, as the photocatalytic performance cannot be elucidated solely by the cation/anion ratio but also by considering the nature of the doping sites generated during synthesis.

■ SNGCL・2024 (Letter) NONBOS　 S. Furukawa, S. Matsuda and M. Takase, Importance of non crystalline-crystalline balance on the photocatalytic activity of bismuth-tungsten mixed-oxide particles prepared by a facile glycol method, Chem. Lett., 53, upae009 (2024).* [DOI] Here, we report results of the photocatalytic oxidative-decomposition activity of bismuth-tungsten mixed oxide particles prepared by a facile glycol method, i.e. heating the starting materials in ethylene glycol under atmospheric pressure with a block bath, which suggest the importance of the balanced formation of base crystalline bismuth tungstate and low-crystalline bismuth oxide deposits, as a possible site for two-electron transfer to oxygen on the bismuth tungstate to obtain relatively high photocatalytic activity.

■ KAGES・2023 (Full Paper) ETRAPD　 Y. Kageshima*, H. Inuzuka, H. Kumagai, B. Ohtani, K. Teshima and H. Nishikiori*, Photothermal Boosting of Photocatalytic Hydrogen Evolution Induced by Defects and Cocatalysts on TiO2, J. Phys. Chem. C., 127, 18327-18339 (2023).* [DOI]

■ XINTC・2023 (Article) ETRAPD　 F. Yu, C. Wang, R. Wang, Y. Li, B. Ohtani, A. Fujishima, Y. Liu and X. Zhang, Solution Plasma Engineers the Surface of N-TiO2 for Thermal Assisted Photocatalysis, Appl. Surf. Sci., 624, 157119 (2023).* [DOI]

■ SAIME・2023 (Research paper) ETRAPD　 S. Emin, M. Machreki, T. Chouki, G. Tyuliev, D. Zigon, B. Ohtani, A. Loukanov and P. Stefanov, Defective TiO2 Nanotube Arrays for Efficient Photoelectrochemical Degradation of Organic Pollutants, ACS Omega, 8, 21605-21617 (2023).* [DOI]

■ BIRIE・2023 (book section) BOOKPT　 B. Ohtani, Scientific Evaluation Methods in Photocatalysis Studies. In "Handbook of Self-Cleaning Surfaces and Materials: From Fundamentals to Applications", (Fujishima, Akira; Irie, Hiroshi; Zhang, Xintong; Tryk, Donald A. eds.) Wiley-VCH Verlag GmbH, 2023, pp. published. [LINK]

■ SNFEN・2023 (Article) ETRAPD　 M. Preeyanghaa, C. Chuaicham, B. Vellaichamy, S. Shenoy, W. Li, K. Manokaran, E. Varathan, B. Neppolian, B. Ohtani, K. Sasaki and K. Sekar, Unveiling the influence of Fe2O3 nanoparticles on CuxO-TiO2(B) nanofiber for dual Z-scheme electron transfer visible light photocatalysts: investigation on local atomic structures and electronic properties, Environ. Sci. Nano, 10, 1268-1283 (2023).* [DOI]

■ SNGCS・2023 (Article) ETRAPD　 K. Sasaki, T. Inoue, C. Chuaicham, N. Saito and B. Ohtani, Z-scheme heterojunction of graphitic carbon nitride and calcium ferrite in converter slag for the photocatalytic imidacloprid degradation and hydrogen evolution, J. Photochem. Photobiol. A Chem., 440, 114644 (2023).* [DOI]

■ SZYMO・2023 (Article) ETRAPD　 S. Dudziak, E. Kowalska, K. Wang, J. Karczewski, B. Ohtani and A. Zielinska-Jurek, The interplay between dopant and a surface structure of the photocatalyst - the case study of Nb-doped faceted TiO2, Appl. Catal. B. Environ., 328, 122448 (2023).* [DOI]

■ BCCAC・2023 (コラム) BOOKPT　 大谷文章，固体触媒材料の「同定」，触媒総合事典，516（2023）*

■ BCCAT・2023 (解説) BOOKPT　 大谷文章，《12-3》酸化チタン光触媒の歴史，触媒総合事典，484-485（2023）*

■ BHYDR・2023 (Chapter) BOOKPT　 B. Ohtani, M. A. Akanda, F. R. Amalia and M. Takashima, Fundamentals and Concepts of Photocatalytic Hydrogen Evolution, Photocatalytic Hydrogen Production for Sustainable Energy, published (2023). [LINK]

■ MAMAT・2023 (Short Communication) ETRAPD　 M. Musa, M. H. b. Mamat, N. Vasimalai, M. Malek, M. Ahmad, A. Suriani, A. Mohamed, H. Hassan, A. Subki, B. Ohtani and M. Rusop, Formation of a Novel Nanorod-Assembled TiO2 Actinomorphic-Flower-Like-Microsphere Film via Ta doping using a Facile Solution Immersion Method, Nanomaterials, 13, 256 (2023).* [DOI] A novel tantalum (Ta)-doped titanium dioxide with unique nanorod-assembled actinomorphic-flower-like-microsphere structured film (TTD) has been fabricated via the solution immersion method in a Schott bottle with improvised clamp. The samples were characterised using FESEM, HRTEM, XRD, Raman, and Hall effect measurements for their structural and electrical properties. Compared to the undoped sample, the rutile-phased TTD sample has higher electron concentration and mobility, and finer nanorods with an average diameter of 100nm that assembled to form microsphere-like structures. In addition, a reversed double-beam photoacoustic spectroscopy measurement has been performed for TTD which reveals that the sample has a high electron trap density up to 2.5μmolg -1 . The TTD showed promising results when employed as the sensing material for a resistive-type humidity sensor with the highest sensitivity of 310 obtained at 3 at.% Ta doping.

■ TKCNO・2022 (full paper) ETRAPD　 T. Khedr, S. M. El-Sheikh, M. Endo-Kimura, K. Wang, B. Ohtani and E. Kowalska, Development of sulfur-doped graphitic carbon nitride for hydrogen evolution under visible light irradiation, Nanomaterials, 13, 62 (2022).* [DOI]

■ BCERA・2022 (総説) BOOKPT　 高島舞・大谷文章，水-酸素反応系における光触媒多電子移動反応機構，セラミックデータブック2022/23，50，39-43（2022）*

■ BLACK・2022 (Article) ETRAPD　 M. Janczarek*, M. Endo-Kimura, K. Wang, Z. Wei, M. A. Akanda, A. Markowska-Szczupak, B. Ohtani and E. Kowalska*, Is black titania a promising photocatalyst?, Catalysts, 12, 1320 (2022).* [DOI]

■ XINTB・2022 (Research Article) ETRAPD　 R. Wang, G. Che, C. Wang, C. Liu, B. Liu, B. Ohtani, Y. Liu and X. Zhang, Alcohol plasma processed surface amorphization for highly efficient photocatalysis, ACS Catal., 12, 12206-12216 (2022).* [DOI]

■ SNFET・2022 (article) ETRAPD　 L. Zhang, C. Chuaicham, V. Balakumar, K. Sekar, B. Ohtani and K. Sasaki, Determination of the roles of FeIII in the interface between titanium dioxide and montmorillonite in FeIII-doped montmorillonite/titanium dioxide composites as photocatalysts, Appl. Clay Sci., 227, 106577 (2022).* [DOI]

■ HCHOL・2022 (Communication) ACTION　 F. R. Amalia, M. Takashima* and B. Ohtani, Are You Still Using Organic Dyes? Colorimetric Formaldehyde Analysis for True Photocatalytic-activity Evaluation, Chem. Commun., 58, 11721-11724 (2022).* [DOI] ●色素の退色（分解）が光触媒活性の評価に不適当であることをしめすとともに，分光光度計のみをつかって適切に光触媒活性を評価する方法としてホルムアルデヒドの分解が有効であることをしめした．

■ CSOKC・2022 (Report) ETRAPD　 L. Csoka, W. Hosakun, O. Kolonics and B. Ohtani, Reversed double-beam photoacoustic spectroscopic analysis of photoinduced change in absorption of cellulose fibres, Sci. Rep., 12, 12475 (2022).* [DOI] [LINK]

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