Showing papers by "Debabrata Chatterjee published in 2006"
TL;DR: In this article, a working mechanism involving excitation of surface adsorbed dye, followed by charge injection into the TiO 2 conduction band and formation of reactive • O 2 - / • HO 2 radicals, is proposed for the degradation of the enlisted organics to carbon dioxide.
68 citations
TL;DR: In this paper, the photocatalytic degradation of acid blue (AB1) and emissive dyes (eosinY or thionine) in air-equilibrated aqueous suspension of TiO 2 semiconductor photocatalyst has been achieved at ambient conditions.
Abstract: Simultaneous photocatalytic degradation of non-emissive dye, acid blue1 (AB1) and emissive dyes (eosinY or thionine) in air-equilibrated aqueous suspension of TiO 2 semiconductor photocatalyst has been achieved at ambient conditions. Under visible light irradiation AB1 undergoes appreciable degradation in presence of a sensitizing dye (eosinY or thionine). However, concomitant decoloration of eosinY (EY) or thionine (Th) due to self-sensitized degradation was also noticed. Mechanistic proposals for the photocatalytic degradation of AB1 using a 150 W Xe lamp with a UV-filter ( λ > 420 nm) as well as without a UV-filter, are discussed. Formation of reactive O 2 − / HO 2 radicals is proposed to be responsible for the degradation of the selected dyes, AB1, EY and Th.
19 citations
TL;DR: In this article, an associative interchange mechanism was used to interpret the spectral and kinetic data and activation parameters of the reaction of catechol to benzoquinone and ascorbate to dehydroascorbic acid.
13 citations
TL;DR: Stopped-flow kinetic measurements were used to compare the reactivities of [Ru(medtra)(H2O)] with NO in aqueous solution at 15°C, pH 7.2 as mentioned in this paper.
8 citations
TL;DR: The interaction of [Ru(III)(edta)(H(2)O)](-) (1) (edta = ethylenediaminetetraacetate) with the oxygen transfer agent HOBr, was studied kinetically and spectroscopic evidence is reported for the formation of a high valent intermediate.
Abstract: The interaction of [RuIII(edta)(H2O)]− (1) (edta = ethylenediaminetetraacetate) with the oxygen transfer agent HOBr, was studied kinetically as a function of [HOBr] and temperature (5–35 °C) at a fixed pH of 6.2. Spectroscopic evidence is reported for the formation of a high valent intermediate (edta)RuVO complex. Water soluble 2,2′-azobis(3-ethylbenzithiazoline-6-sulfonate) (ABTS) was employed as a trap for this intermediate in order to gain further mechanistic information. Reactions were carried out under pseudo-first conditions for [ABTS] ≫ [HOBr] ≫ [1], and were monitored as a function of time for the formation of the one-electron oxidation product ABTS˙+. The reported kinetic data are interpreted in terms of a suggested reaction mechanism and discussed in reference to data reported before.
4 citations