Abstract
The possibility of regulating the sorption processes on clinoptilolite and nontronite by acidic and basic modifications was found. The effect of the aluminosilicate structure and the nature and concentration of modifying agent on the adsorption and surface characteristics of mineral sorbents was determined. An increase in the sorption capacity of natural minerals as a result of preadsorption treatment with solutions of sulfuric, hydrochloric, and nitric acids, as well as sodium hydroxide and ammonium hydroxide, was shown. An ambiguous effect of the nature and concentration of various modifiers on the formaldehyde adsorption was found. An increase in the specific surface and pore volume of minerals occurs during acidic treatment. The action of sodium hydroxide results in a decrease in the nontronite specific surface and an increase in the pore volume. Treatment with ammonium hydroxide does not affect the surface characteristics of the sorbents. The most effective modifiers for clinoptilolite in the formaldehyde adsorption are 0.5 M hydrochloric acid and 1.5 M ammonium hydroxide; for nontronite, 1.0 M sulfuric acid is most effective.
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