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VASHURINA IRINA YU. |
Sphere of interests:
Equilibrium sorption of acid dyes by wool, the impact of multi-charged metal cations and the role of hydrophobic interactions
Some results:
The process of equilibrium dye adsorption by wool in the presence of multi-charged inorganic salt cations has been studied experimentally. An extremal dependence of distribution coefficient of the dye between the fiber and the solution upon salt concentration has been obtained; it is more distinct for three-charged aluminum cation than for two-charged cations;
The theoretical model is developed for the description of dye adsorption isotherm which considers both natural ampholytic polymer physico-chemical properties and the affinity of inorganic ions to wool;
The stimulating impact of multi-charged metal ions upon acid dye adsorption by wool is revealed to be principally caused by the adsorption capacity of the cations themselves, which is mainly dependent upon the strength of the ionic bonds between metal and fiber, and also upon cation hydration parameters;
An original approach has been proposed to the modelling of non-ionic interactions in the course of acid dye adsorption by wool. With the help of this approach, it has been demonstrated that hydrophilic-hydrophobic dye properties (which stipulate the efficiency of dye adsorption by wool) are substantially determined by the composition of the electrolytes in dyeing solutions;
Applying disperse dyes as models of acid dyes (similar molecular structure and the absence of ionic properties) to investigate the influence of medium electrolyte composition upon dye adsorption by wool in accordance with non-ionic mechanisms, abrupt stimulation of dye-fiber interactions has been observed in the narrow salt concentration intervals which corresponds to the regions of maximal water destruction by multi-charged metal cations;
The experimental data on thermodynamics of the adsorbtion of three 1,4-diaminoanthraquinone acid dyes by wool fiber indicated that structural changes in the solvent are largely responsible for dye transfer from the aqueous phase into the adsorbed state;
The analysis of the experimental data and thermodynamic parameters of the adsorption of two acid dyes (different in their molecular structure and affinity) by wool has led to the conclusion that for the dyes with high affinity to the fiber, structure breaking effects caused by small salt additions are strongly dependent on temperature. As the adsorption temperature is raised, the amount of adsorbed dye at first increases (it corresponds to the growth of
H0ads. > 0), but at a particular temperature, the tendency changes to the opposite (
H0ads. and
S0ads. become negative).
Publications
1. Telegin F.Yu., Vashurina I.Yu., Shormanov A.V.,
Ivanova E.N., Kalinnikov Yu.A., Melnikov B.N. Equilibrium sorption of dyes by wool in the
presence of multi-charged cations of inorganic salts. Zhurnal fizicheskoi khimii
(J.Phys.Chem.), Vol.67, No 4, (1993), P.752-756.
2. Vashurina I.Yu., Busygina T.Yu., Ivanova E.N., Kalinnikov Yu.A. Wool dyeing by
acid dyes in water-salt media. P.I. Simulation of acid dyes molecular properties.
Tekstilnaja khimija (Textile Chemistry), No 1 (5), (1994), P.
39-45.
3. Vashurina I.Yu., Busygina T.Yu., Ivanova E.N., Kalinnikov Yu.A. Wool dyeing by
acid dyes in water-salt media. P.II. Simulation of fiber molecular properties.
Tekstilnaja khimija (Textile Chemistry), No 2(7), (1995), P.78-85.
4. Vashurina I.Yu., Kalinnikov Yu.A. Thermodynamics of adsorption of
1,4-diaminoanthraquinone acid dyes by wool fiber. Tekstilnaja khimija (Textile Chemistry),
No 2(11), (1997), P. 44-49.
5. Vashurina I.Yu., Kalinnikov Yu.A. Thermodynamic description of acid dyes
adsorption by wool from salt-containing aqueous solutions. Tekstilnaja khimija (Textile
Chemistry)- in print.
6. Vashurina I.Yu., Kalinnikov Yu.A The mechanism of the intensification of wool
dyeing with acid dyes. In: Textile Chemistry Theory, Technology, Equipment / Ed.
A.P.Moryganov. - Nova Sci. Publishers, Inc., Commack, New York, (1997), P.131-145.
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