Significant enhancement of bromate removal in drinking water: Implications for the mechanism of sonocatalytic reduction

Mingcan Cui, Jongbok Choi, Yonghyun Lee, Junjun Ma, Dukmin Kim, Jaeyoung Choi, Min Jang, Jeehyeong Khim

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Bromate (BrO 3 ) is a potential carcinogenic compound that can form during the disinfection of drinking water. For the first time, the sonocatalytic reduction of BrO 3 were studied through examining the effect of the important operational parameters such as ultrasound (US) frequency, TiO 2 loading, pH, temperature and other anions. By observing sonoluminescence (SL) at various frequencies and measuring H 2 production rates, a new reduction mechanism for BrO 3 is also proposed. The kinetic results presented that the BrO 3 reduction rates enlarged as the measured H 2 production rate increased for all parameters, and the slopes between the BrO 3 reduction and H 2 production rates for sonocatalysis were much higher than those for sonolysis. Interestingly, sonolysis could be limited by the amount of H 2 production, but sonocatalysis could increase the BrO 3 reduction rate because of additional electrons (e ) from the surface of TiO 2 via SL. The highest SL intensities for H 2 production and BrO 3 reduction rates occurred at an ultrasound frequency of 500 kHz, implying that an increase in SL intensity caused by ultrasound cavitation enhanced H 2 production and increased the e - released to the conduction band of TiO 2 . At 500 kHz, BrO 3 reduction rate (6.84 × 10 −2  min −1 ) by sonophotocatalysis was 5.2 times higher than that (1.32 × 10 −2  min −1 ) of sonolysis. Investigation into the effect of anion species showed that BrO 3 reduction was inhibited or enhanced depending on the type of anions present. In real application, sonocatalytic reduction of BrO 3 could be advantageous, as it has higher reduction rates than those reported for photocatalysis.

Original languageEnglish
Pages (from-to)404-412
Number of pages9
JournalChemical Engineering Journal
Volume317
DOIs
Publication statusPublished - 2017

Keywords

  • Bromate
  • Hydrogen
  • Kinetic
  • Reduction
  • Sonoluminescence
  • Ultrasound

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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