Synthesis and solubility of hopeite Zn3(PO4)2·4H2O
Tomasz Bajda
AGH University of Krakow, Faculty of Geology, Geophysics and Environment ProtectionKrakow, Poland
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, oraz 18 gru 2023
O artykule
Kategoria artykułu: Short Note
Data publikacji: 18 gru 2023
Zakres stron: 78 - 81
Otrzymano: 12 lis 2023
Przyjęty: 26 lis 2023
DOI: https://doi.org/10.2478/mipo-2023-0008
Słowa kluczowe
© 2023 Tomasz Bajda et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
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.