Recyclable Adsorbents for Potash Brine Desalination Based on Silicate Powder: Application, Regeneration and Utilization
Rakhym A.B. Baranchiyeva Z.Y. Kenessova A.K. Zhaksybai B.B. Dauzhanova D.N. Mastai Y. Seilkhanova G.A.
December 2023Multidisciplinary Digital Publishing Institute (MDPI)
Colloids and Interfaces
2023#7Issue 4
Silicate mineral powders (SMP) from weathered granite soil from Kazakhstan are proposed for the desalination of potash brines containing sodium, potassium and chloride ions. Batch adsorption experiments using acid-treated silicate (AS) achieved a Na+/K+/Cl− recovery of ~13/28/6 mg/g. An isothermal study best fitted the Freundlich and Dubinin–Radushkevich models for Na+ and K+/Cl−. The kinetic data were best modeled by pseudo-second-order kinetics for Na+/K+ and pseudo-first-order for Cl−. Thermodynamic calculations showed spontaneity under natural conditions. For Na+/K+, physisorption is accompanied by ion exchange. To study the possibility of sorbent reuse, several cycles of K+/Na+ adsorption–desorption were carried out under optimal conditions. AS selectively adsorbed potassium ions, maintaining a high effectiveness during five cycles providing K-form silicate fertilizers. Leachates of spent AS contain high concentrations of K/Na/Ca/Mg and other microelements essential for plants. Thus, SMP resolve two issues: the desalination of brine and the provision of fertilizer.
chloride adsorption , K-silicate fertilizer , potassium adsorption , silicate mineral powders , sodium adsorption , sorbent regeneration
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Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Center of Physical Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, 050012, Kazakhstan
Department of Chemistry and the Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
Faculty of Chemistry and Chemical Technology
Center of Physical Chemical Methods of Research and Analysis
Department of Chemistry and the Institute of Nanotechnology and Advanced Materials
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