Adsorption of Zn2+ on the (110) surface of TiO2 (Rutile)

A density functional molecular dynamics study

A. V. Bandura, Jorge Osvaldo Sofo, J. D. Kubicki

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Adsorption of Zn2+ at the rutile TiO2 (110)-aqueous interface was studied with Born-Oppenheimer molecular dynamics at 300 K. Simulations were carried out using the periodically repeated slab model with vacuum gap of 15 Å filled with 72 H2O molecules. Two possible adsorption sites, monodentate above bridging oxygen (Ti-O-Ti or Obr) and bidentate above terminal oxygens (Ti-O), were investigated. Sites with different coordination environment for adsorbed Zn2+ differ from each other by the position of Zn2+ above surface level and by characteristic Zn-O distances. Obtained results gave evidence that 4-fold coordination of adsorbed Zn2+ is more probable than the 6-fold coordination found for aqueous species. The hydrolysis of H2O molecules was observed in the first coordination shell of adsorbed ion, resulting in formation of OH- groups attached to Zn2+. Calculated energies favor the tetrahedral bidentate structure of hydrated Zn2+ on the rutile surface. The model structures are compared to observed positions of Zn2+ above the rutile (110) surface using X-ray scattering techniques.

Original languageEnglish (US)
Pages (from-to)9608-9614
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number19
DOIs
StatePublished - May 19 2011

Fingerprint

rutile
Molecular dynamics
Oxygen
molecular dynamics
Adsorption
adsorption
Molecules
oxygen
Model structures
X ray scattering
Hydrolysis
Vacuum
Ions
hydrolysis
molecules
slabs
vacuum
titanium dioxide
scattering
ions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

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title = "Adsorption of Zn2+ on the (110) surface of TiO2 (Rutile): A density functional molecular dynamics study",
abstract = "Adsorption of Zn2+ at the rutile TiO2 (110)-aqueous interface was studied with Born-Oppenheimer molecular dynamics at 300 K. Simulations were carried out using the periodically repeated slab model with vacuum gap of 15 {\AA} filled with 72 H2O molecules. Two possible adsorption sites, monodentate above bridging oxygen (Ti-O-Ti or Obr) and bidentate above terminal oxygens (Ti-O), were investigated. Sites with different coordination environment for adsorbed Zn2+ differ from each other by the position of Zn2+ above surface level and by characteristic Zn-O distances. Obtained results gave evidence that 4-fold coordination of adsorbed Zn2+ is more probable than the 6-fold coordination found for aqueous species. The hydrolysis of H2O molecules was observed in the first coordination shell of adsorbed ion, resulting in formation of OH- groups attached to Zn2+. Calculated energies favor the tetrahedral bidentate structure of hydrated Zn2+ on the rutile surface. The model structures are compared to observed positions of Zn2+ above the rutile (110) surface using X-ray scattering techniques.",
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Adsorption of Zn2+ on the (110) surface of TiO2 (Rutile) : A density functional molecular dynamics study. / Bandura, A. V.; Sofo, Jorge Osvaldo; Kubicki, J. D.

In: Journal of Physical Chemistry C, Vol. 115, No. 19, 19.05.2011, p. 9608-9614.

Research output: Contribution to journalArticle

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