Peroxymonosulfate activation for efficient sulfamethoxazole degradation by Fe3O4/Β-FeOOH nanocomposites: Coexistence of radical and non-radical reactions

Chenxu Li, Jiaen Wu, Wei Peng, Zhendong Fang, Jie Liu (Corresponding author)

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Abstract

Environmental friendly magnetic Fe3O4/β-FeOOH nanocomposites with low cost were prepared via a simple one pot method and their physiochemical properties were investigated. The Fe3O4/β-FeOOH nanocomposites efficiently catalyzed the activation of peroxymonosulfate (PMS) for sulfamethoxazole (SMX) degradation and can be easily recovered through magnetic separation. The effects of catalyst dosage, PMS dosage, temperature and pH were evaluated. The catalyst showed great stability and reusability based on the successive degradation cycles. The reactive oxygen species (ROS) including sulfate radical (SO4 −[rad]), hydroxyl radical ([rad]OH) and singlet oxygen (1O2) were generated in the Fe3O4/β-FeOOH/PMS system, while both of SO4 −[rad] and 1O2 were dominantly attributed to the SMX degradation. The special tunnel-type structure and surface oxygen vacancies of β-FeOOH may be responsible for the high catalytic activity towards PMS to degrade SMX. At last, the catalytic mechanism of PMS on the surface of catalysts were proposed.

Original languageEnglish
Pages (from-to)904-914
Number of pages11
JournalChemical Engineering Journal
Volume356
DOIs
Publication statusPublished - 15 Jan 2019

Keywords

  • FeO/β-FeOOH nanocomposites
  • Peroxymonosulfate
  • Singlet oxygen
  • Sulfamethoxazole
  • Sulfate radicals
  • Fe3O4/beta-FeOOH nanocomposites

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