Copper and zinc decontamination from single- and binary-metal solutions using hydroxyapatite

This study investigated the sorption of aqueous Cu and Zn onto hydroxyapatite surfaces

Alessia Corami; Silvano Mignardi; Vincenzo Ferrini

2006

Key concepts

Scholarcy highlights

  • Toxic metals contamination of waters, soils and sediments can seriously affect plants, animals and human being
  • The bioavailability of metal ions can be reduced trapping them in minerals with low solubilities
  • This study investigated the sorption of aqueous Cu and Zn onto hydroxyapatite surfaces
  • Batch experiments were carried out using synthetic hydroxyapatite
  • In the Cu–Zn binary system, competitive metal sorption occurred with reduction of the removal capacity by 13–76% and 10–63% for Cu and Zn, respectively, compared to the single-metal systems
  • Heavy metal immobilization was attributed to a two-step mechanism: first rapid surface complexation and secondly partial dissolution of hydroxyapatite and ion exchange with Ca followed by the precipitation of a heavy metal-containing hydroxyapatite

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