Sorption properties of modified glauconite
Abstract
The modification of minerals allows obtaining new sorption materials with improved properties, expanding the areas of their successful application. The aim of the study was the development of methods for obtaining new modified sorbents based on glauconite, the determination of their quantitative composition and sorption properties. The chemical activity of the sorbent depends on the number and nature of the active centres involved in the sorption process. The number of active centres of glauconite was changed by thermal activation at temperatures of 600 and 1000°C. The analysis of the obtained data of the indicator method showed that adsorption centres with different strength at рКа +2.1, +5.2, located in the region of Bronsted acids were revealed on the surface of the glauconite samples. For the initial glauconite samples, the main Bronsted centres prevailed at рКа=+9.4. The thermal activation of glauconite reduced the specific adsorption value. Also, it was shown that the modification and heat treatment of glauconite led to a decrease in the specific surface area and real density and an increase in the average particle diameter.
Glauconite sample modified with manganese (IV) oxide showed higher values of sorption of iron (III) ions in comparison with unmodified and thermally activated samples. A technological scheme for obtaining glauconite modified with manganese (IV) oxide in granular form for the purification of underground artesian waters with an increased content of iron (III) was proposed. The initial and thermally activated glauconite samples were modified with the sodium salt of carboxymethylcellulose. Granular forms of the obtained modified sorbents were used to study the absorption of oil and oil products. It was found that the best sorption properties were shown by a sample subjected to thermal activation at 1000 °C. At this temperature, significant structural changes, accompanied by the formation of a large number of defects, occurred in glauconite. The sodium salt of carboxymethyl cellulose fills these defects when modified, promoting the absorption of oil and oil products. The obtained results showed that the modification and thermal activation of a natural mineral have different effects on the sorption of iron (III) ions and oil products.
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References
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