Nanostructured silica-gel doped with TiO2 for mercury vapor control

Erik Pitoniak, Chang Yu Wu, Danielle Londeree, David Mazyck, Jean Claude Bonzongo, Kevin Powers, Wolfgang Sigmund

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


A novel high surface area SiO2-TiO2 composite has been developed for elemental mercury vapor removal from combustion sources. The composite exhibits synergistic adsorption and photocatalytic oxidation. Mercury vapor in the gas stream is adsorbed, oxidized and stays on the composite. The composite has demonstrated a high mercury capacity (1512 μg/g) although in its current 3-mm pellet form only the outer layer is effectively utilized. The loading of 13% TiO2 shows the best removal, both with and without UV irradiation. Increasing TiO2 loading beyond this level does not enhance the removal further. It has also been observed that the composite after being 'activated' by photocatalytic oxidation has better performance, probably due to the change of surface functional groups. The examination of the effects of flow velocity reveals that mass transfer is the rate limiting step. Relative humidity has been found to impede adsorption therefore decreasing the overall removal efficiency. By rinsing with acid, both the deposited mercury and composite can be regenerated.

Original languageEnglish (US)
Pages (from-to)281-292
Number of pages12
JournalJournal of Nanoparticle Research
Issue number3-4
StatePublished - Aug 2003

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Modeling and Simulation


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