Synthesis of Disk-Shaped Tungsten(VI) Oxide Particles with Various Physical Properties for Mineralization of Acetic Acid in Water Under Irradiation of Visible Light.

Disk-shaped tungsten(VI) oxide (D-WO₃) particles were synthesized according to a previously reported method consisting of pyrolysis, precipitation, and calcination, and the calcination temperature was changed (200-600 °C). The samples were characterized by field-emission scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, the Brunauer- Emmett-Teller single-point method, and diffuse reflectance spectroscopy. In addition, to evaluate the photocatalytic activities of the samples, the mineralization of acetic acid to carbon dioxide (CO₂) was measured by loading Pt particles onto the surface of the samples by photodeposition and irradiating them in an aqueous suspension with a blue light-emitting diode.

Synthesis, structure, and fluorescence properties of a calcium-based metal-organic framework.

The solvothermal reaction of a mixture of calcium acetylacetonate and 1,4-naphthalenedicarboxylic acid (HNDC) in a solution containing ethanol and distilled water gave rise to a metal-organic framework (MOF), {(HO)[Ca(NDC)(CHO)(OH)]}·1.1HO. This MOF possesses a new structure composed of calcium clusters and HNDC linker anions and shows a unique fluorescence property; it exhibits a fluorescence peak at 395 nm ( = 350 nm) at room temperature, which is blue-shifted compared with that exhibited by the free HNDC ligand.

Characterization of water-soluble dark-brown pigment from Antarctic bacterium, Lysobacter oligotrophicus.

Lysobacter oligotrophicus strain 107-E2(T) isolated from Antarctica produces dark-brown colored water-soluble pigment, in addition to hydrolases and lytic enzymes. The production of pigment is a common characteristic among members of the genus Lysobacter, but the identity of the pigments has been unknown. In this study, we identified the pigment from L.