Valorization of Eggshell Biowaste for Sustainable Environmental Remediation

The main objective of this study is to evaluate the ability of eggshell-based HAP in the removal of Co2+ ions from aqueous solutions

Silvano Mignardi; Luana Archilletti; Laura Medeghini; Caterina De Vito


Scholarcy highlights

  • The management of huge amounts of waste from the food processing industry is a challenging problem
  • The results showed that the entire surface of Eggshell-based hydroxyapatite grains is characterized by the presence of P
  • The results of this study showed that eggshell biowaste is a suitable precursor material for the sustainable synthesis of adsorbent for the removal of Co2+ from wastewater
  • ESHAP removal capacity was evaluated at different contact time and initial Co2+ concentration
  • The adsorption process was well described by the pseudo-second-order kinetics model and only partly by the intraparticle diffusion model reaching equilibrium within 80 min
  • The Co2+ removal mechanism involves surface adsorption on the ESHAP surface, ion exchange with Ca2+ and dissolution of the adsorbent followed by the precipitation of a new phosphate with formula Co3(PO4)2∙8H2O
  • The conversion of eggshell to a material for toxic metal remediation can contribute to the sustainable management of this biowaste

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