Degradation of Orange II by Fe2O3 and CeO2 nanocomposite when assisted by NaHSO3

Yu Lei, Yixing Hao, Hao Cheng, Jianfeng Ma, Yong Qin, Yong Kong, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

Abstract

Fe2O3@CeO2 nanocomposites were synthesized by water bath heating method to activate NaHSO3 for Orange II dye (50 mg L−1) degradation, which reached up to 98.2% within 120 min. The Fe2O3@CeO2 and NaHSO3 dosages and the molar ratios of Ce and Fe in Fe2O3@CeO2 were investigated to obtain the optimum conditions as follows: 0.02 g Fe2O@CeO2, 0.1 g NaHSO3 and the molar ratio of Ce and Fe was 5:2 (designated as Ce-Fe-1, or simply Fe2O3@CeO2). In addition, Fe2O3@CeO2 catalyst displayed superior catalytic performance to those materials that were previously reported, as verified by the good stability (reached 90.9% after three cycles) and high degradation rate of Orange II (98.2%) of the currently developed material. Existence of ·SO4 and ·OH radicals were verified by Electron Spin Resonance Spectroscopy during degradation, and these radicals are proposed to have high degradation efficiency of Orange II. On the basis of the detected radicals, a possible degradation mechanism was proposed to provide more choices for the application of sulfite in advanced oxidation processes (AOPs).

Original languageEnglish (US)
Article number127315
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume628
DOIs
StatePublished - Nov 5 2021

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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