Research on adsorption – desorption the ability of hydroxyapatite for Co2+ ions and recovery cobalt by electrochemical deposition

Le Thi Duyen; Le Thi Phuong Thao; Dinh Thi Mai Thanh; Nguyen Thu Phuong

doi:10.62239/jca.2024.019

Research on adsorption – desorption the ability of hydroxyapatite for Co²⁺ ions and recovery cobalt by electrochemical deposition

Authors

Le Thi Duyen Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Ha Noi Author
Le Thi Phuong Thao Hanoi University of Mining and Geology, Duc Thang, Bac Tu Liem, Ha Noi Author
Dinh Thi Mai Thanh University of Science and Technology of Hanoi Author
Nguyen Thu Phuong Vietnam Academy of Science and Technology Author

DOI:

https://doi.org/10.62239/jca.2024.019

Keywords:

Hydroxyapatite, adsorption, desorption, recovery, Co2+ ion

Abstract

Hydroxyapatite has a nanostructure with the chemical formula of Ca₁₀(PO₄)₆(OH)₂. In this paper, hydroxyapatite is used to study the ability to adsorb Co²⁺ ions. The influence of some factors on Co²⁺ adsorption capacity and efficiency has been studied. Co²⁺ adsorption efficiency and capacity reached 85.08% and 6.38 mg/g under the suitable conditions: hydroxyapatite mass of 0.2 g/50 mL solution, 50 mg/L initial Co²⁺ concentration, pH 5.0, exposure time of 30 minutes at room temperature (25^oC). The process of desorption of Co²⁺ from the loaded adsorbent and recovery of metallic Co was also studied. Cobalt recovery efficiency reached 94.58% under appropriate conditions: applied current 7.5 mA, electrolysis time of 10 hours, loaded hydroxyapatite mass of 0.1 g, temperature 60^oC. After desorption process, the adsorbent was regenerated for further studies. The adsorption isotherm was studied based on two Langmuir and Freundlich models. The adsorption kinetics were examined using two pseudo-first-order and pseudo-second-order kinetic models.

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Published

30-03-2024

Issue

Vol. 13 No. 1 (2024): March

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How to Cite

Research on adsorption – desorption the ability of hydroxyapatite for Co2+ ions and recovery cobalt by electrochemical deposition. (2024). Vietnam Journal of Catalysis and Adsorption, 13(1), 111-116. https://doi.org/10.62239/jca.2024.019