In the article Dash-Salakhly bentonite of Azerbaijan as a sorbent from aqueous solutions has been investigated. Physico-chemical characteristics of clays such as heat of wetting, capacity of exchange complex, humidity, porosity have been studied. For increasing adsorptive capacity of hydrophilic clay from aqueous solutions it was processed with cation-active surfactant. Optimum conditions were found out for adsorption, methylene blue, rhodamine G, methylene violet on obtained sorbent (dependence on time of contacting, on pH medium, and temperature). On the basis of experimental data we plotted isotherms of adsorption which conform to polymolecular adsorption.  Obtained sorbent is recommended for purification of waste waters from cation-active dyes.