Removal of heavy metals from aqueous solution using novel nanoengineered sorbents: Self-assembled carbamoylphosphonic acids on mesoporous silica

Wassana Yantasee, Yuehe Lin, Glen E. Fryxell, Brad J. Busche, Jerome C. Birnbaum

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

Self-assembled monolayers of carbamoylphosphonic acids (acetamide phosphonic acid and propionamide phosphonic acid) on mesoporous silica supports were studied as potential absorbents for heavy and transition metal ions in aqueous wastes. The adsorption capacity, selectivity, and kinetics of the materials in sequestering metal ions, including Cd2+, Co 2+, Cu2+, Cr3+, Pb2+, Ni 2+, Zn2+, and Mn2+, were measured in batch experiments with excess sodium ion. The solution pH ranged from 2.2 to 5.5. The kinetics study shows that the adsorption reached equilibrium in seconds, indicating that there is little resistance to mass transfer, intraparticle diffusion, and surface chemical reaction. The competitive adsorption study found the phosphonic acid-SAMMS to have an affinity for divalent metal ions in decreasing order of Pb2+>Cu2+>Mn2+> Cd2+>Zn2+>Co2+>Ni2+. The measured Cd2+ adsorption isotherm was of the Langmuirian type and had a saturation binding capacity of 0.32 mmol/g.

Original languageEnglish (US)
Pages (from-to)3809-3825
Number of pages17
JournalSeparation Science and Technology
Volume38
Issue number15
DOIs
StatePublished - Oct 6 2003

Keywords

  • Adsorption
  • Carbamoylphosphonic acid
  • Equilibrium
  • Kinetics
  • MCM-41
  • Self-assembled monolayers on mesoporous silica

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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