1070-4272/04/7705-0861C2004 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 77, No. 5, 2004, pp. 861!862. Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 5,
2004, pp. 866!867.
Original Russian Text Copyright + 2004 by Petrova, Burinskaya, Kotetskii.
Sorption Kinetics of Acid and Reactive Dyes on Wool Fiber
in the Presence of Redox Systems
O. V. Petrova, A. A. Burinskaya, and V. V. Kotetskii
St. Petersburg State University of Technology and Design, St. Petersburg, Russia
Received October 28, 2003
Abstract-Low-temperature dyeing with Acid Bordeaux and Reactive Brilliant Red 5CX is studied.
Wool dyeing with acid and reactive dyes is conven-
tionally performed at the boiling temperature of the
solution, which may cause unpractical use of expen-
sive raw materials and high energy consumption.
Therefore, low-temperature dyeing (at temperature by
15320oC below the boiling point) is of great practical
interest, as allowing minimization of the damage of
fiber and decrease in the hydrolysis of reactive dyes,
pollution of the environment, and power consumption.
Previously it was demonstrated that addition of
redox systems in a dye bath facilitates low-tempera-
ture dyeing of wool with acid and reactive dyes .
As a substrate we used wool rove with a surface
density of 1.32 g cm
. Dyeing was performed accord-
ing to the standard procedure .
As redox systems we used hydrogen peroxide in a
mixture with various reducing agents such as glycerol,
glucose, polyoxymethylene, and hexamethylenetetr-
As demonstrated in [1, 3], the use of redox systems
(0.007530.015 M) considerably increases the sorption
of acid and reactive dyes in the course of low-tem-
perature dyeing. To determine the performance of
redox systems in dyeing, we studied the sorption
kinetics of acid and reactive dyes on wool fiber. The
contact time of the substrate with a dye varied from
15 to 90 min. The sorption was monitored by the re-
sidual concentration of dyes in the dye bath. The ki-
netic curves of Acid Bordeaux and Reactive Brilliant
Red 5CX in the presence of various redox systems are
given in Figs. 1a and 1b.
In the presence of redox systems, the maximal
sorption is observed in the first 60 min. With further
increase in the dyeing time, the sorption remains prac-
tically unchanged. Thus, the use of any of the redox
systems studied facilitates sorption more strongly than
does increase in the dyeing temperature from 80oCto
the boiling point. To characterize quantitatively the
effect of addition of redox systems, we estimated the
dyeing rate constants. For this purpose, we plotted the
logarithm of the concentration change of a dye against
the dyeing time (Figs. 2a, 2b). The observed linearity
of the dependence logc3t suggests the first-order
kinetics of dyeing. The rate constants were then esti-
mated by the Stirling’s equation . The results are
given in the table.
Fig. 1. Kinetic curves of (a) Acid Bordeaux and (b) Reac-
tive Brilliant Red 5CX in the presence of various redox
systems: (1) no redox system, (2)H
3glycerol; the same for Fig. 2. (c) Dye concentra-
tion and (t) dyeing time; the same for Fig. 2. Dyeing tem-
perature (oC): (1) 100 and (2!5) 80; the same for Fig. 2.