1. Ultrasonically enhanced zinc powder replacement method for cobalt removal: Electrochemical behavior, numerical simulation.
- Author
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Ye, Jianqiang, Zhu, Rong, Xiang, Dawei, Zhu, Manying, Wang, Shixing, Fu, Likang, and Zhang, Genwei
- Subjects
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MASS transfer , *ZINC powder , *SOUND pressure , *COBALT , *ULTRASONIC waves , *COMPUTER simulation , *ZINC sulfate - Abstract
The zinc powder replacement method for Co removal is characterized by several challenges, such as poor mass transfer and agglomeration. To solve this problem, the ultrasonically enhanced zinc powder replacement method was developed and used to remove Co from the sulfate solution, and a 95.02% removal rate of Co was achieved under the optimized condition. Compared with conventional conditions, the removal rate increased by 24.5%. The behavior and mechanism of zinc powder replacing Co were comprehensively analyzed through electrochemistry and COMSOL Multiphysics. Chronoamperometry curves showed that after the introduction of ultrasound, the reaction current increased by approximately two times compared with the conventional condition. The cyclic voltammetry (CV) curves showed that the reduction potential of Co positively shifted, accompanied by an increase in peak current. The electrochemical impedance spectroscopy (EIS) tests showed that the nuclear transmission resistance decreased by approximately 1.6 times compared with conventional conditions. In addition, the COMSOL simulation revealed that, after the system was subjected to ultrasonic conditions, the temperature, flow rate, and sound pressure physical field increased, which accelerated the heat and mass transfer process in the solution. The removal behavior of the system was studied using scanning electron microscopy and X-ray diffraction. Ultrasonic waves decomposed the insoluble substances on the surface of zinc powder, refined the particles, and improved the removal rate of Co. This provides new insights into the ultrasound-enhanced reaction. In this paper, we introduce an innovative approach by ultrasonic enhanced zinc powder for the replacement removal of cobalt, achieving high-efficiency cobalt elimination. Additionally, the electrochemical kinetics of the zinc powder replacement process is comprehensively investigated. Theoretical validation of ultrasound-enhanced heat and mass transfer processes within the solution was achieved through numerical simulations conducted using COMSOL software. [Display omitted] • Ultrasound was used to improve the efficiency of Co removal from zinc sulfate solution. • The removal rate was increased by 24.65% compared with convention. • The introduction of ultrasound increased the mass transfer in the solution. • Ultrasound decomposed the insoluble substance on the surface of the zinc powder. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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