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Urchin-like Co3O4/peroxymonosulfate system for crystal violet degradation: Reaction kinetics and process optimization
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  • Bo Li,
  • Li-Yuan Dai,
  • Wei-Song Wang,
  • Huan-yan Xu
Li-Yuan Dai
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Wei-Song Wang
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Huan-yan Xu
Harbin University of Science and Technology

Corresponding Author:[email protected]

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Abstract

Advanced oxidation processes based on the sulfate radicals (SR-AOPs) have been considered as promising methods to eliminate the organic contaminants from wastewater. In this work, the urchin-like Co3O4 was prepared and developed as an efficient heterogenous catalyst to activate peroxymonosulfate (PMS) for the degradation of crystal violet (CV). The morphological observations by SEM and TEM confirmed a distinct urchin-like structure of as-prepared Co3O4 sample. XRD pattern indicated that all the characteristic diffraction peaks belonged to Co3O4 with the face-centered-cubic spinel structure. The contrast experiments showed that the CV degradation efficiency in urchin-like Co3O4/PMS system was much higher than that in pristine PMS or Co3O4 system, suggesting that PMS could be effectively activated by the urchin-like Co3O4 for CV degradation. Kinetic studies revealed that CV degradation reaction in urchin-like Co3O4/PMS system followed the retarded first-order model. The process optimization of CV degradation was implemented by response surface methodology (RSM).