Kinetics of oxidation of indigo carmine by N-sodio-N-bromotoluenesulfonamide in acidic buffer medium
摘要:
The kinetics of oxidation of indigo carmine (IC) by N-sodio-N-bromotoluenesulfonamide or bromamine-T (BAT) in pH 5 buffer medium has been investigated at 30 degrees C using spectrophotometry at 610 nm. The reaction rate shows dependencies of first-order on [IC](0), second-order on [BAT](0) fractional order on [H+], and inverse first-order on [p-toluenesulfonamide]. The addition of chloride and bromide ions, and the variation of ionic strength of the medium have no influence on the reaction rate. There is a negative effect of the dielectric constant of the solvent. Activation parameters have been calculated. A single-pathway mechanism for the reaction, consistent with the kinetic data, has been proposed. (C) 1997 John Wiley & Sons, Inc.
Oxidative decolorization of indigo caramine dye with chloramine-T catalyzed by cobalt(II)
作者:B. M. Venkatesha、R. T. Radhika、S. Ananda、K. Byrappa
DOI:10.1007/s11164-011-0266-2
日期:2011.4
dye by oxidation process using chloramine-T as oxidant and Co(II) as catalyst in acidicbuffermedia, pH 5.8 has been kinetically studied at 300 K. Decolorization of indigo caramine dye was followed spectrophotometrically. Decolorization and oxidation led to a decrease in Chemical Oxygen Demand of the dye. The Co(II)-catalyzed reaction shows first-order dependence of the rate on chloramine-T and indigo