A5069420713- Advanced Photocatalysis Techniques
- Algal biology and biofuel production
- TiO2 Photocatalysis and Solar Cells
- Calcium Carbonate Crystallization and Inhibition
- Advanced Nanomaterials in Catalysis
- Paleontology and Stratigraphy of Fossils
- Copper-based nanomaterials and applications
- Plant Diversity and Evolution
- Marine and coastal plant biology
- Quantum Dots Synthesis And Properties
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Electrocatalysts for Energy Conversion
- Marine Bivalve and Aquaculture Studies
- Catalytic Processes in Materials Science
- Organic Chemistry Cycloaddition Reactions
- Silicon Effects in Agriculture
- Covalent Organic Framework Applications
- Ocean Acidification Effects and Responses
- Seaweed-derived Bioactive Compounds
- Enzyme function and inhibition
- Nanocluster Synthesis and Applications
- Botanical Research and Applications
- Cassava research and cyanide
- Clay minerals and soil interactions
Tokyo Institute of Technology
2017-2025
Institute of Science Tokyo
2024-2025
Shanghai Institute for Science of Science
2024
Japan Society for the Promotion of Science
2019-2021
The University of Tokyo
2004
Tokyo Gakugei University
1986-1997
Nara University of Education
1989
Network for Business Sustainability
1970
The Mn(2+)-oxidizing bacterium Pseudomonas fluorescens GB-1 deposits Mn oxide around the cell. During growth of a culture, activity cells first appeared in early stationary phase. It depended on O2 concentration culture during late logarithmic Maximal was observed at an oxygen 26% saturation. could be recovered cell extracts and proportional to protein extracts. specific increased 125-fold by ammonium sulfate precipitation followed reversed-phase gel filtration column chromatographies....
The structure of cobalt oxide (CoOx) nanoparticles dispersed on rutile TiO2 (R-TiO2) was characterized by X-ray diffraction, UV-vis-NIR diffuse reflectance spectroscopy, high-resolution transmission electron microscopy, absorption fine-structure and photoelectron spectroscopy. CoOx were loaded onto R-TiO2 an impregnation method from aqueous solution containing Co(NO3)2·6H2O followed heating in air. Modification the with 2.0 wt % Co at 423 K for 1 h resulted highest photocatalytic activity...
Transition metal carbides, nitrides, and carbonitrides (MXenes) are emerging two-dimensional (2D) materials, with a variety of applications, such as heterogeneous catalysis, due to their metallic conductivity resulting charge transport properties. However, the semiconductor photocatalysis MXene-related materials has not been experimentally demonstrated. Here, we show that stacked MXene sheets Y2CF2 behave an n-type semiconductor, 1.9 eV band gap rather negative conduction potential...
Plasmonic Au/TiO2 thin film works as a stable water oxidation photoanode. Here we show that site-selective deposition of nanosized CoOx cocatalyst at the edge Au nanoparticles on TiO2 improves photoelectrochemical activity. The was deposited by photoassisted electrochemical method onto film. loading amount controllable changing electric charge flowed during deposition, which influenced performance. Under visible light, optimized CoOx/Au/TiO2 generated photoanodic current, ∼3 times higher...
Open AccessCCS ChemistryRESEARCH ARTICLES15 Oct 2024Significant effect of crystallization polymeric carbon nitride on photoconductivity and photocatalytic activity for visible-light CO2 reduction Toshiya Tanaka, Chao Zhang, Ryuichi Nakada, Jo Onodera, Fumitaka Ishiwari, Megumi Okazaki, Akinori Saeki, Osamu Ishitani, Guigang Zhang Kazuhiko Maeda Tanaka , Nakada Onodera Ishiwari Okazaki Saeki Ishitani https://doi.org/10.31635/ccschem.024.202404964 SectionsSupplemental MaterialAboutPDF ToolsAdd...
Mixed-anion compounds are promising candidates as visible-light-driven photocatalysts; however, their synthesis is generally difficult compared to that of ordinary single-anion counterparts such oxides. This difficulty often an obstacle in maximizing the performance mixed-anion photocatalysts. In this work, Pb2Ti2O5.4F1.2 particles having a well-defined octahedral shape were successfully synthesized by microwave-assisted hydrothermal (MHT) method at 473 K. The MHT-Pb2Ti2O5.4F1.2 exhibited...
Abstract Three species of the phaeophycean genus Padina were investigated with electron microscope. Calcification is initiated in P. japonica and pavonica at inrolled thallus margin which contains chloroplasts acts as a semi-enclosed space. In these species, apical cells are covered pilose layer small aragonite crystals associated. The non-calcareous arborescens has similar anatomy but here young possess smooth cuticular instead it suggested that nucleation inhibited by this layer. pavonica,...
The development of a highly active photocatalyst for visible-light water splitting requires high-quality semiconductor material and cocatalyst, which promote both the migration photogenerated charge carriers surface redox reactions. In this work, cocatalyst was loaded onto an oxyfluoride photocatalyst, Pb
Abstract Co3O4-loaded TiO2 is a photocatalyst capable of oxidizing water into O2 by absorbing an entire range visible light (400 < λ 850 nm). In this work, the photocatalytic activity for oxidation was investigated with respect to crystal phase, specific surface area, and morphology support. Results reactions using six different samples that possessed single-phase anatase or rutile structure indicated could be improved applying support had larger because it accommodate amount Co3O4...
Composites comprising nanocrystalline anatase TiO2 and nanoclusters of first-row transition-metal oxides (MOx; M = Mn, Fe, Co, or Ni), which can potentially function as water oxidation catalysts, were applied photocatalysts for under visible light (480 < λ 900 nm). Although showed no absorption, each the MOx/TiO2 composites was capable absorbing light. Activities during visible-light-driven examined using these materials in presence Ag+ an electron acceptor. Co Ni found to be effective...
TiO2 is a good photoanode material for water oxidation to form O2; however, UV light (λ < 400 nm) necessary this system operate. In work, cobalt species were introduced onto rutile thin film grown on fluorine-doped tin oxide (FTO) substrate visible-light activation of and construct sites. films prepared the FTO surface by thermohydrolysis TiCl4, followed annealing at 723 K in air; loading was achieved simply immersing TiO2/FTO into an aqueous Co(NO3)2 solution room temperature, heating 423...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical dimerization of a benzoselenete derivativeShoko Yamazaki, Keijiro Kohgami, Megumi Okazaki, Shinichi Yamabe, and Toshio AraiCite this: J. Org. Chem. 1989, 54, 1, 240–243Publication Date (Print):January 1989Publication History Published online1 May 2002Published inissue 1 January 1989https://pubs.acs.org/doi/10.1021/jo00262a050https://doi.org/10.1021/jo00262a050research-articleACS PublicationsRequest reuse permissionsArticle...
The photocatalytic activity of SrTiO3 modified with Co3O4 nanoparticles for water oxidation under visible light (λ > 480 nm) was investigated respect to the physicochemical properties support. synthesized by a polymerized complex method or hydrothermal method, followed calcination in air at different temperatures order obtain particles having sizes. nanoparticles, which provide both absorption and centers, were loaded on as-prepared an impregnation using Co(NO3)2 as precursor, heating 423 K...
Soft X-ray microradiography was applied to observation of the cystoliths, calcified bodies higher plants, in leaves ofMorus bombycis, Humulus scandens, Ficus elastica, F. retusa (Moraceae),Boehmeria platanifolia, Pilea viridissima (Urticaceae) andMomordica charantia (Cucurbitaceae). It proved that this technique is useful for examination shape, size, distribution and number cystoliths fresh leaves. The microradiographs revealed large cigar-shaped leaf ofP. viridissima, neighbor-cystoliths...
Dye-sensitized solar cells and photocatalysts that consist of a light-absorbing dye wide gap oxide semiconductor substrate have been studied extensively as means energy conversion. Although defects existing at an surface significant impact on the electron injection efficiency from excited state dye-molecule into oxide, effects process not fully understood in any dye-sensitized system. In this study, we present systematic evaluation using emissive Ru(II) complexes adsorbed substrates...