Green chitosan–starch–polyvinyl alcohol bio-composite hydrogel for zirconium capture from zircon raffinate

June 24, 2026BMC ChemistryOpen Access

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Key Points

The study aims to develop a polymer-based sorbent for efficient zirconium removal from acidic solutions.
Synthetized a novel sorbent using chitosan, starch, and polyvinyl alcohol via aqueous mixing and ultrasonication.
Characterization techniques included FT-IR, SEM, and surface area analysis to assess functional groups and structure.
Batch studies evaluated uptake efficiency across varying pH levels and initial Zr(IV) concentrations.
Maximum zirconium uptake of 188 mg g⁻1 achieved at pH 1.25 with initial concentrations of 750 mg L−1.
Thermodynamic parameters indicate adsorption is spontaneous (ΔG = –18.84 to –19.60 kJ mol−1) and exothermic (ΔH = −11.35 kJ mol−1).
The sorbent maintained stability in up to 2 M H2SO4 and demonstrated high desorption efficiency for zirconium recovery.

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Study showcases effective zirconium removal in acidic solutions, suggesting a novel sorbent's potential.

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Dakroury et al. (2026) studied this question.

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