Effects of the pH of the Medium of Sorption of Direct Light-Strong Dyes with Sawdust from Aqueous Solutions

Purpose of research. The purpose of this work was to study the sorption process of direct dyes with sawdust depending on the pH of the medium.

Methods. Waste from the woodworking industry was used as a sorbent – birch sawdust with a particle size of less than 2 mm. Two direct light-resistant dyes were selected as adsorbates by preliminary tests: turquoise CB, red 2C. 

3D models of the structure of these direct dyes, constructed using ChemOffice, are presented.

Results. The light absorption maxima for direct light-resistant dyes were selected: red 2C - 520 nm, and turquoise CB - 610 nm. The article studies the effect of sawdust mass on the degree of sorption of direct light-strong dyes (turquoise CB and red 2C) from aqueous solutions.

The regularities of the kinetics of sorption from aqueous solutions of direct light-resistant dyes with birch sawdust depending on the pH of the medium are investigated. Kinetic curves of the sorption process of direct dyes with sawdust are analyzed.  The presentation of experimental data as a dependence of the degree of achieving the equilibrium of sorption (F) on time (t) allowed us to determine the criteria for the stage limiting the rate of absorption of the substance. In order to confirm the influence of external and intradiffusion processes on the sorption rate, the corresponding processing of kinetic curves in the corresponding coordinates -ln(1-F) from t and G_t from t^0.5 was carried out.

Kinetic values of approximation reliability are obtained.

Conclusion. The results obtained showed that, depending on the pH of the medium, sawdust has the best sorption properties in relation to the direct turquoise dye in an acidic medium, and is practically not sorbed in a neutral medium. The effect of the pH of the medium on the sorption process of the direct light-strong red dye has a less pronounced character: the degree of sorption does not exceed 50% for almost the entire period of phase contact. It is proved that birch sawdust can be used for wastewater treatment from direct light-resistant dyes.

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