Publications by authors named "Takashi Ibusuki"
Reduction of CO(2) using semiconductors as photocatalysts has recently attracted a great deal of attention again. The effects of organic adsorbates on semiconductors on the photocatalytic products are noteworthy. On untreated TiO(2) (P-25) particles a considerable number of organic molecules such as acetic acid were adsorbed.
View Article and Find Full Text PDFThe decomposition of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in water by UV-visible light irradiation, by H202 with UV-visible light irradiation, and by a tungstic heteropolyacid photocatalyst was examined to develop a technique to counteract stationary sources of PFOA. Direct photolysis proceeded slowly to produce CO2, F-, and short-chain perfluorocarboxylic acids. Compared to the direct photolysis, H2O2 was less effective in PFOA decomposition.
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- The study investigated the effectiveness of Rh-deposited TiO2 catalysts for the photocatalytic oxidation of benzene in air, finding that Rh improved durability and reduced carbon build-up on the catalyst.
- Optimal Rh loading was found to be between 0.5-1.0 wt %, although the catalyst gradually deactivated over time due to accumulation of carbonaceous materials, which was linked to changes in Rh metal oxidation states.
- The catalysts could be regenerated through hydrogen reduction or heat treatment in nitrogen, highlighting the importance of Rh(0) in maintaining catalyst performance during prolonged reactions.
The heterogeneous decomposition of CHF2OCH2C2F5, a potential substitute for hydrofluorocarbons, over aluminosilica clay minerals in air, was confirmed to occur at 313 K in a closed-circulation reactor. HC(O)OCH2C2F5, the gaseous main product was produced through hydrolytic elimination of F atoms from the CHF2OCH2- group. CHF2OCH2CF3 also decomposed to HC(O)OCH2CF3 over the clay minerals.
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