Іnfluence of acoustic radiation of ultrasonic range on modification of natural clinoptilolite by ions of argentums

Сухацький, Ю. В.; Пиріг, М. А.; Mashtaler, A.; Знак, З. О.; Зінь, О. І.; Sukhatskyi, Yu.; Pyrig, M.

doi:10.23939/ctas2020.01.033

Cited by 1 publication

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“…In addition, the diffusion of ions is known to be intensified by the action of ultrasonic vibrations. Previous research [30] showed that the number of equivalents of silver ions in clinoptilolite can be greater than the cation exchange capacity of this zeolite. This phenomenon is known as superequivalent adsorption [32] and means that silver ions are absorbed by the clinoptilolite particle due to ion exchange and sorption of the silver salt.…”

Section: Introductionmentioning

confidence: 92%

“…The implementation of the modification process, even at reduced pressure, which should ensure desorption of gas, can not significantly increase the sorption capacity of the zeolite. Use of ultrasound due to the action of acoustic oscillations can aid in release of air bubbles [30] . The effect of ultrasound on desorption of gases or other substances from porous materials is well known [31] .…”

Section: Introductionmentioning

confidence: 99%

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Improved modification of clinoptilolite with silver using ultrasonic radiation

Знак

Зінь

Mashtaler

et al. 2021

Ultrasonics Sonochemistry

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The modification of natural clinoptilolite with silver ions using ultrasound has been investigated in the current work. The modification process was performed using clinoptilolite of different fractions (0–3.0 mm) over the temperature range of 25–55 °C, ultrasonic power range of 8.0–12.5 W and AgNO 3 concentration range of 0.01–0.1 M. The zeolite modification was performed in the presence of sonication and mechanical stirring in separate runs for comparison. Fundamental analysis demonstrated that the use of ultrasound ensures desorption of air from clinoptilolite particles and accelerates the diffusion of Ag + ions and subsequent ion exchange. Increasing the particle size of clinoptilolite led to a natural decrease in its sorption capacity. A slight increase in the sorption capacity with an increase in the equivalent particle diameter from 0.081 to 0.35 mm was seen due to changes in the structure of clinoptilolite particles during mechanical grinding. The calculated temperature coefficient of the sorption process of Ag + ions as <1.47 means that the modification takes place with dominant control in the intradiffusion region. Increasing the power of ultrasonic irradiation did not provide a monotonous change in the sorption capacity of clinoptilolite. Increasing the concentration of argentum nitrate solution provided an increase in the content of silver ions in clinoptilolite. In general, the advantage of using ultrasonic vibrations to modify the natural clinoptilolite of different fractions with Ag + ions was demonstrated in terms of achieving higher sorption capacity, also elucidating the effect of different operating conditions.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%