A Mechanistic Model for Mercury Capture with In Situ–Generated Titania Particles: Role of Water Vapor

Sylian Rodríguez, Catherine Almquist, Tai Gyu Lee, Masami Furuuchi, Elizabeth Hedrick, Pratim Biswas

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

A mechanistic model to predict the capture of gas-phase mercury (Hg) species using in situ-generated titania nanosize particles activated by UV irradiation is developed. The model is an extension of a recently reported model for photochemical reactions by Almquist and Biswas that accounts for the rates of electron-hole pair generation, the adsorption of the compound to be oxidized, and the adsorption of water vapor. The role of water vapor in the removal efficiency of Hg was investigated to evaluate the rates of Hg oxidation at different water vapor concentrations. As the water vapor concentration is increased, more hydroxy radical species are generated on the surface of the titania particle, increasing the number of active sites for the photooxidation and capture of Hg. At very high water vapor concentrations, competitive adsorption is expected to be important and reduce the number of sites available for photooxidation of Hg. The predictions of the developed phenomenological model agreed well with the measured Hg oxidation rates in this study and with the data on oxidation of organic compounds reported in the literature.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalJournal of the Air and Waste Management Association
Volume54
Issue number2
DOIs
Publication statusPublished - 2004 Feb

All Science Journal Classification (ASJC) codes

  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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