Journal
DYES AND PIGMENTS
Volume 73, Issue 1, Pages 90-97Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2005.10.014
Keywords
Reactive Blue-19; reactive dye; oxidative decolorization; acidified bromate
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The kinetics of the oxidative decolorization of Reactive Blue dye (C.I.19) (RB-19) with KBrO3 acidified by both the H2SO4 and cation-exchange resins (H+-form) were followed up by monitoring the decrease of the absorbance of RB-19 at lambda(max) = 592 run. In homogenous medium, the reaction was carried out under pseudo-first-order conditions. The [BrO3-] was ca 600 greater than that of [RB-19]. The rate of reaction increased with decreasing [H2SO4] and [BrO3-], while it decreased with increasing [RB-19]. The effects of the ions, Cl-, Br, Mo(IV), and So(4)(-2) were investigated and the reaction rate increased with increasing concentrations of the former three, while it decreased with increasing [SO42-] In heterogeneous medium the reaction exhibited the zero-order kinetics with respect to [RB-19]. The homogeneous system gave a higher rate compared with the heterogeneous one. The reaction is entropy controlled. A reaction mechanism has been proposed. (c) 2005 Elsevier Ltd. All rights reserved.
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