<abstract xmlns="http://www.w3.org/1999/xhtml">

Minerals from the phosphate groups are used in environmental engineering as thermodynamically stable vehicles for heavy metals such as zinc. The hopeite Zn3(PO4)2·4H2O was synthesized and characterized by X-ray diffraction and scanning electron microscopy. The solubility of the hopeite was measured at 25°C. The average solubility product, log Ksp, for the reaction Zn3(PO4)2·4H2O ⇔ 3Zn2+ + 2PO43- + 4H2O at 25°C is –35.72 ± 0.03. The free energy of formation, ΔG°f,298, calculated from this measured solubility product is –3597.4 ± 1.0 kJ mol-1. The immobilization of zinc in the hopeite structure offers the possibility of developing an effective method for removing Zn from wastewater, water and soils.
</abstract>

Minerals from the phosphate groups are used in environmental engineering as thermodynamically stable vehicles for heavy metals such as zinc. The hopeite Zn3(PO4)2·4H2O was synthesized and characterized by X-ray diffraction and scanning electron microscopy. The solubility of the hopeite was measured at 25°C. The average solubility product, log Ksp, for the reaction Zn3(PO4)2·4H2O ⇔ 3Zn2+ + 2PO43- + 4H2O at 25°C is –35.72 ± 0.03. The free energy of formation, ΔG°f,298, calculated from this measured solubility product is –3597.4 ± 1.0 kJ mol-1. The immobilization of zinc in the hopeite structure offers the possibility of developing an effective method for removing Zn from wastewater, water and soils.

Synthesis and solubility of hopeite Zn3(PO4)2·4H2O

Mineralogia

This work is licensed under the Creative Commons Attribution 4.0 International License.

Synthesis and solubility of hopeite Zn(PO)·4HO

Minerals from the phosphate groups are used in environmental engineering as thermodynamically stable vehicles for heavy metals such as zinc. The hopeite...

Synthesis and solubility of hopeite Zn₃(PO₄)₂·4H₂O

Article Category: Short Note

Published Online: Dec 18, 2023

Page range: 78 - 81

Received: Nov 12, 2023

Accepted: Nov 26, 2023

DOI: https://doi.org/10.2478/mipo-2023-0008

Keywords
zinc, phosphate, apatite, dissolution, solubility product

© 2023 Tomasz Bajda et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Synthesis and solubility of hopeite Zn3(PO4)2·4H2O

Article Category: Short Note

Published Online: Dec 18, 2023

Page range: 78 - 81

Received: Nov 12, 2023

Accepted: Nov 26, 2023

DOI: https://doi.org/10.2478/mipo-2023-0008

Keywordszinc, phosphate, apatite, dissolution, solubility product

© 2023 Tomasz Bajda et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Synthesis and solubility of hopeite Zn₃(PO₄)₂·4H₂O

Keywords
zinc, phosphate, apatite, dissolution, solubility product