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Influence of Magnetic Field on the Kinetics of Ho(III) Solvent Extraction Using D2EHPA: A Comprehensive Study
Konrad Wojtaszek1, Andrea Cristofolini2, Arturo Popoli2
1AGH University of Krakow, Faculty of Non-Ferrous Metals, al. A. Mickiewicza 30, Krakow, 30-059, Poland.
Small Methods
|March 4, 2025
Summary
Magnetic fields enhance the extraction kinetics of holmium (III) using di(2-ethylhexyl)phosphoric acid (D2EHPA) at higher temperatures. This suggests a potential alteration in the extraction mechanism under magnetic influence.
Area of Science:
- * Chemical Engineering
- * Materials Science
- * Physical Chemistry
Background:
- * Investigating the extraction of rare-earth elements like holmium (Ho(III)) is crucial for various industrial applications.
- * Di(2-ethylhexyl)phosphoric acid (D2EHPA) is a common extractant in hydrometallurgy.
- * The effect of external fields on liquid-liquid extraction kinetics is an area of active research.
Purpose of the Study:
- * To examine the kinetics of Ho(III) extraction using D2EHPA under the influence of a magnetic field.
- * To determine the optimal conditions for Ho(III) extraction, including concentration, pH, and temperature.
- * To elucidate the role of magnetic fields in modifying the extraction process and mechanism.
Main Methods:
- * Spectrophotometric techniques were employed to study extraction kinetics.
- * Experiments were conducted across varying Ho(III) and D2EHPA concentrations, pH levels, and temperatures (5-35 °C).
- * Characterization of precipitates and complexes involved X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and nuclear magnetic resonance (NMR) spectroscopy.
Main Results:
- * Extraction kinetics were significantly enhanced by magnetic fields at temperatures above 25 °C.
- * The formation of a white precipitate at the phase boundary was observed and characterized.
- * NMR analysis provided insights into the structure and magnetic properties of the D2EHPA-Ho(III) complex.
Conclusions:
- * Magnetic fields can accelerate the Ho(III)-D2EHPA extraction process, particularly at elevated temperatures.
- * The findings suggest a potential modification of the extraction mechanism induced by magnetic fields.
- * Further research is warranted to fully understand the underlying mechanisms and optimize magnetic-assisted extraction systems.
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