Adsorption of Ni 2+ ions by phosphate and carbonate adsorbents
https://doi.org/10.29235/1561-8323-2025-69-6-477-487
Abstract
The adsorption of Ni2+ ions by sorbents based on dolomite thermally activated at 800 °C (D-800), phosphated dolomite (PD), and Zr-modified PD (PD-Zr) was studied. It was found that D-800 sample was characterized by the highest sorption capacity (364 mg/g), while at the initial concentration of Ni2+ ions of 300 mg/L, the purification of aqueous solutions to the MPC standards for drinking water (< 0.1 mg/L) was achieved, and at C0 (Ni2+) of 50 mg/L, deep purification to a residual concentration of < 0.01 mg/L occurred. It was revealed that the absorption of Ni2+ ions by the D-800 sorbent is due to the heterogeneous precipitation of nickel hydroxicarbonate, and in the case of the PD sorbent, nickel hydrophosphate is formed. The results of desorption of Ni2+ ions from saturated sorbents indicated the occurrence of ion exchange with the participation of amorphous zirconium phosphate for the PD-Zr sample. The lowest desorption degree (<1 %) was demonstrated by samples D-800 and PD. In the dynamic sorption process, the granular sorbent D-800 provided purification of more than 1000 column volumes of solution with C 0 (Ni2+) 10 mg/L below the MPC standards for drinking water at a linear filtration rate of 20 m/h.
Keywords
inorganic sorbents,
heat treated dolomite,
Ca–Mg phosphates,
Zr–Ca–Mg phosphates,
nickel,
sorption isotherms,
desorption
Supporting agencies: This work was supported by the Belarusian Republican Foundation for Fundamental Research (project X25КИ-019).
About the Authors
I. L. Shashkova
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Shashkova Irina L. ‒ Ph. D. (Chemistry), Leading Researcher
9/1, Surganov Str., 220072, Minsk
N. V. Kitikova
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Kitikova Natalja V. ‒ Ph. D. (Chemishry), Senior Researcher
9/1, Surganov Str., 220072, Minsk
A. I. Ivanets
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Ivanets Andrei I. ‒ Corresponding Member, D. Sc. (Chemistry), Professor, Science Head of the Laboratory
9/1, Surganov Str., 220072, Minsk
T. F. Kouznetsova
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Kouznetsova Tatyana F. ‒ Ph. D. (Chemistry), Associate Professor, Head of the Laboratory
9/1, Surganov Str., 220072, Minsk
V. G. Prozorovich
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Prozorovich Vladimir G. ‒ Senior Researcher
9/1, Surganov Str., 220072, Minsk
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