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Photocatalytic oxidation of 2,6-dichloroindophenol in the titanium dioxide aqueous suspension

V. Brezová, M. Čeppan, and M. Veselyý and L. Lapčík

Department of Textile, Pulp, and Paper, Faculty of Chemical Technology, Slovak Technical University, CS-81237 Bratislava


Abstract: Photocatalytic oxidation of sodium salt of 2,6-dichloroindophenol (DCIP) in titanium dioxide aqueous suspension has been studied. DCIP is photocatalytically oxidized on the active TiO2 surface by the medium pressure Hg lamp with pyrex sleeve radiation (λ> 280 nm). The apparent integral quantum yield of the DCIP decomposition was determined. Photocatalytic decomposition of DCIP in aqueous suspension of TiO2 can be described by the formal first-order kinetics. The same results can be obtained for TiO2 (P25) during the Hg lamp irradiation and solar exposure as well. The reaction is suitable for testing of the semiconductor powder photocatalytic activity.

Full paper in Portable Document Format: 452a233.pdf


Chemical Papers 45 (2) 233–246 (1991)

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