Evaluation of the O3/graphene-based materials catalytic process: pH effect and iopromide removal

Y. Yoon, H. Oh, Y. T. Ahn, M. Kwon, Y. Jung, W. K. Park, T. M. Hwang, W. S. Yang, J. W. Kang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Graphene-based materials, including graphene oxide (GO), reduced-graphene oxide (rGO), and non-oxidative graphene (nOG) were evaluated for catalytic ozonation in water solutions. Among the graphene-based materials evaluated for catalytic ozonation, it was confirmed that rGO was unsuitable to apply to the ozone (O3)/graphene-based materials catalytic process because the high electron mobility of rGO prevented the transformation of O3 into hydroxyl radicals ([rad]OH). On the other hand, GO, which had sufficient oxygenated functional groups on the surface, decomposed and generated the most amount of O3 and [rad]OH, respectively. Although O3/nOG process produced a lower amount of [rad]OH than O3/GO process, nOG was more effective than GO for the transformation yields of O3 into [rad]OH. Furthermore, nOG could generate [rad]OH not only in the bulk phase, but also on the surface of nOG during catalytic ozonation. However, iopromide (IPM) was effectively removed during O3/GO process due to the more [rad]OH generated in the bulk phase than O3/nOG process.

Original languageEnglish
Pages (from-to)77-85
Number of pages9
JournalCatalysis Today
Volume282
DOIs
Publication statusPublished - 2017 Mar 15

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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