Adsorption of Direct Light-Resistant Dyes by Cellulose Raw Materials from Aqueous Solutions

The purpose of this work was to study the process of adsorption of direct light-resistant dyes from aqueous solutions by cellulose raw materials.

Methods. Waste of the woodworking industry was used as a sorbent - sawdust of deciduous trees with a particle size of 3.25 to 4.25 mm. Three direct lightfast dyes were selected by preliminary tests as adsorbates: turquoise SV, blue KU, red 2C.

To determine the maximum light absorption of the direct light-resistant dyes studied in this work, the absorption spectra were taken over the entire wavelength range.

To determine the residual concentration, calibration graphs of the dependence of the optical density on the concentration of the corresponding dyes (turquoise CB, blue KU, red 2C) were built. The paper presents the linearized equations of the calibration graphs obtained using the least squares method and the approximation reliability values, the values of which show the degree of compliance of the trend model with the initial data.

Results. The maximum light absorption was determined: for the dye direct turquoise CB - 611 nm, for the blue KU - 563 nm, for the red 2C - 523 nm.

The optimal conditions for the adsorption of direct light-fast dyes by cellulose raw materials have been established and the parameters characterizing the adsorption of direct light-fast dyes (turquoise CB, blue KU, red 2C) by cellulose raw materials from aqueous solutions at different mass values have been determined.

Analysis of the kinetic curves of sorption suggests that under the indicated optimal conditions, the highest degree of sorption (more than 99%) by cellulose raw materials from aqueous solutions is achieved in 30 minutes for the direct lightfast dye blue KU.

Conclusion. The results obtained will show that 2C direct red dye is sorbed 2 times less than other dyes used in this work. The dye direct blue KU reached the highest degree of sorption with the lowest mass of cellulose raw material of 3.0 g.

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