Adsorption Of The Dyes On Magnesium Hydroxide

Category: Ukrainean-polish sympozium

ADSORPTION OF THE DYES ON MAGNESIUM HYDROXIDE

L. M. Soldatkina, А. N. Purich, V. V. Menchuk

I.I. Mechnikov State University, Odessa, Ukraine

At present for deep adsorption purifikation of wastewaters of textile, stockinet, cellulose-paper industry from dyes is used activated coal. However this adsorbent is not always effective, so long as considerable part of its porous space is inaccessible for dyes molecules, associats and micelles. Important task is a search of relation cheap, accessible and effective adsorbents for removal dyes from wastewaters.

The aim of this work was established some adsorption regularities of removal acid, straight and basic dyes on magnesium hidroxide. Magnesium hidroxide was precipitated from chloride and sulphate magnesium by sodium hidroxide.

It was found that the dyes adsorption isotherms have a complicated form, which depends on solution temperature, dyes nature and adsorbent receipt method. So, for example, the L-type isotherms are typical for adsorption acid orange, straight claret; S-type isoterms are typical for adsorption acid red. Adsorption isoterms of straight brown belong as to L-type (adsorption on magnesium hidroxide from sulphate salt), so and S-type (adsorption on magnesium hidroxide from chloride salt). It was established that methylene blue on magnesium hidroxide does not removal.

Rise of solutions temperature from 298 to 338 K brings to diminution of dyes adsorption, except of straight claret, on magnesium hidroxide, from sulphate salt. In last case adsorption of straight claret with rise of temperature increases.

The comparison of numeral adsorption values for straight and acid dyes showed, that in case magnesium hidroxide from sulphate salt, adsorption more, than on magnesium hidroxide from chloride salt.

Significance of free energy adsorption (-DG) describes energy of interaction adsorbent - dye. The values -DG are sufficiently great and put together 32-40 kJ/mol. The significance of enthalpy (DH) are negative and equal 14-67 kJ/mol.



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