ÎNLĂTURAREA COLORANŢILOR TEXTILI ŞI A SURFACTANŢILOR DIN SOLUŢIILE-MODEL PRIN UTILIZAREA METODELOR FIZICO-CHIMICE

Vera MATVEEVICI, Maria GONŢA, Larisa MOCANU, Viorica IAMBERTEV Universitatea de Stat din Moldova

Abstract

REMOVAL OF TEXTILE DYES AND SURFACTANTS FROM MODEL SOLUTIONS BY USING PHYSICOCHEMICAL METHODS

Laboratory research has been conducted on model systems containing textile dyes as basic components, and as auxiliary compounds were used surfactants and polyalcohols. The concentration of the organic components of the studied systems is reduced as a result of using advanced physicchemical methods. At first stage was performed electrofloatation process that takes place under the action of electrolytic gases, which was followed by oxidation with Fenton's reagent or titanium dioxide with UV irradiation (Λ=365 nm). Samples that have not been treatment to acceptable standards have been subjected to the subsequent adsorption process of compounds remaining onactive carbon. As a result of scientific research it was found that the degree of water purification by organic compounds depends on the time of electrofloatation and surfactant concentration. The mixture of active dyes and cationic surfactants in model solutions may be treated by a combination of electrofloatation and adsorption methods on active carbon, and the solutions containing a mixture of direct and active dyes, anionic surfactants can be purified by combining electrofloatation, catalytic oxidation with hydrogen peroxide methods, and adsorption on active carbon. In the presence of polyalcohols (ethylene glycol) the effect of removing the mixture of dyes, surfactants and ethylene glycol decreases,therefore, solutions are not purified to the sanitary norms, even in case of combining electrofloatation, catalytic oxidation and adsorption on active carbon methods. Keywords: electrofloatation, catalytic oxidation, surfactants substances, polyalcohols, textile dyes.