1. Modification of the structure parameters and characteristics of layered silicates under the influence of ultrasonic and ultrahigh frequency waves.
- Author
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Buntin, Artem, Nizamov, Aidar, and Vaganov, Mikhail
- Abstract
This paper presents the results of a study of the effect of ultrasonic and ultrahigh-frequency treatments on the structure and adsorption index of the organic dye methylene blue bentonite of the Republic of Tatarstan. It was found that ultrasonic treatment of an aqueous suspension of bentonite reduces the average diameter of its particles by 4 times and increases the adsorption capacity by 20% due to an increase in the specific surface area and the formation of a homogeneous structure. The optimal mode of ultrasonic treatment: the treatment time is 3 minutes, the frequency is 20 kHz, the ratio of bentonite and water is 1:1.2, the settling of the suspension before treatment is 12-16 hours. Based on the comparison of various modes of ultrasonic exposure, it is shown that the efficiency of dispersion of solid particles in the liquid phase depends more on its intensity per unit volume of the treated bentonite suspension. With ultrahigh-frequency treatment of bentonite lasting 4 minutes and a power of 750 Watts, the adsorption index increases by 5% due to the expansion of the adsorption space by removing adsorbed water. It is confirmed by a change in the surface structure of bentonite particles and a decrease in the interplane distance in the layered mineral montmorillonite from 15.05 Å to 12.71 Å. Ultrahigh-frequency treatment, compared with thermal treatment, makes it possible to significantly intensify the processes of dehydration of layered bentonite minerals up to 7.5 times when higher values of adsorption of organic molecules of the methylene blue dye are achieved. The paper presents diagrams of the density distribution of bentonite particles, the microstructure of bentonite before and after treatment with an ultrahigh frequency electromagnetic field, and X-ray phase analysis data. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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