Minimizing bromate formation with cerium dioxide during ozonation of bromide-containing water

Tao Zhang, Weipeng Chen, Jun Ma*, Zhimin Qiang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

This work investigated the effect of several metal oxides including α-FeOOH, α-Fe2O3, γ-FeOOH, and CeO2 on bromate formation potential (BFP) during ozonation of bromide-containing water. Results indicate that CeO2 could most effectively minimize the BFP among these metal oxides taking ozonation alone as control. The BFP minimization by O3/CeO2 favored a relatively low Br- concentration (i.e., <1.0 mg L-1) and pH < 7. Water temperature ranging from 5 to 25 °C had no significant impact on the percent reduction of BrO3-. Further investigation indicates that the effective BFP minimization can be ascribed to neither the surface adsorption of BrO3- or Br- on CeO2 nor the surface reduction of BrO3- to HOBr/OBr- by CeO2. It seems to have relationship with the activity of surface Ce(IV) sites. The CeO2 can lower the concentration of H2O2 which is formed during ozone decomposition and promotes BrO3- formation. Another possible reason for the BFP minimization is that the CeO2 could possibly reduce BrO{radical dot} to HOBr/OBr- during the decomposition of H2O2.

Original languageEnglish (US)
Pages (from-to)3651-3658
Number of pages8
JournalWater Research
Volume42
Issue number14
DOIs
StatePublished - Aug 1 2008

Keywords

  • Bromate formation potential
  • Cerium dioxide
  • Hydrogen peroxide
  • Minimization
  • Ozonation

ASJC Scopus subject areas

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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