Biosorption of divalent Pb, Cd and Zn on aragonite and calcite mollusk shells

Yang Du, Fei Lian, Lingyan Zhu

Research output: Contribution to journalArticlepeer-review

Abstract

The potential of using mollusk shell powder in aragonite (razor clam shells, RCS) and calcite phase (oyster shells, OS) to remove Pb2+, Cd2+ and Zn2+ from contaminated water was investigated. Both biogenic sorbents displayed very high sorption capacities for the three metals except for Cd on OS. XRD, SEM and XPS results demonstrated that surface precipitation leading to crystal growth took place during sorption. Calcite OS displayed a remarkably higher sorption capacity to Pb than aragonite RCS, while the opposite was observed for Cd. However, both sorbents displayed similar sorption capacities to Zn. These could be due to the different extent of matching in crystal lattice between the metal bearing precipitate and the substrates. The initial pH of the solution, sorbent's dosage and grain size affected the removal efficiency of the heavy meals significantly, while the organic matter in mollusk shells affected the removal efficiency to a lesser extent.

Original languageEnglish (US)
Pages (from-to)1763-1768
Number of pages6
JournalEnvironmental Pollution
Volume159
Issue number7
DOIs
StatePublished - Jul 2011

Keywords

  • Aragonite
  • Biogenic sorbent
  • Calcite
  • Crystal lattice
  • Heavy metals

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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