Abstract
Here we report on the results concerning the influence of ultrasound on the dissolution process of metal oxides CoO, Ni2O3 and Mn2O3 in choline chloride/sulfosalicylic acid as a deep eutectic solvent. The mechanism of dissolution under cavitation conditions with ultrasonic assistance is described. Theoretical research resulted in equations describing the dissolution process kinetics and linking its basic parameters. Optimal conditions for the most effective ultrasound application were found. Experimental data on dissolution kinetics of metal oxides in deep eutectic solvents was also obtained. It was discovered that experimental data correlates well with theoretical calculations, which confirms the correctness of developing a picture about the physicochemical nature of the process under study.
Highlights
The dissolution process of one or several components in an appropriate solvent is widely applied in technological production [1,2,3].One of the most efficient methods for the intensification of dissolution of solid materials implies the use of ultrasound (US), which significantly reduces the process time and increases the product yield [4,5,6,7,8].Earlier works have studied the effect of ultrasound on the extraction of organic and inorganic substances [9,10,11,12,13,14]
The present research is primarily devoted to a theoretical description of the impact of ultrasonic cavitation erosion on dissolution of metal oxides in deep eutectic solvents (DES)
Ultrasound is able to boost the dissolution of metal oxide by its shredding and by creating an acoustic flow that promptly deletes the saturated solution film from the surface
Summary
The dissolution (or leaching) process of one or several components in an appropriate solvent is widely applied in technological production [1,2,3].One of the most efficient methods for the intensification of dissolution (leaching) of solid materials implies the use of ultrasound (US), which significantly reduces the process time and increases the product yield [4,5,6,7,8].Earlier works have studied the effect of ultrasound on the extraction of organic and inorganic substances [9,10,11,12,13,14]. In case the strength of solid surface is great enough for its particle’s separation under the influence of a pressure drop caused by the collapsing bubble but does not exceed the cracking threshold, the solution penetrates through capillaries deep into particles due to an acoustocapillary effect and promotes its dissolution. These and other features of US can efficiently show themselves and noticeably improve the performance of an US-leaching system only with strict adherence to all necessary parameters, which are determined from detailed physicochemical analysis of processes under consideration, taking into account the individual features of each scheme of realization of given technology. On the basis of well-established ideas about the physical nature of ultrasonic cavitation erosion, original working formulas were obtained for the first time, which make it possible to quantify the parameters of the process of dissolving metals using ultrasound
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