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Highly efficient α-MnOα-MnO-500 nanocomposite for peroxymonosulfate activation: Comprehensive investigation of manganese oxides

Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 6, Issue: 4, Page: 1590-1600
2018
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Metrics Details

  • Citations
    204
    • Citation Indexes
      204
  • Captures
    62

Article Description

In this paper a nanorod α-MnOα-MnO-500 nanocomposite demonstrated the highest efficiency and remarkable stability in persulfate activation compared with other manganese oxide based catalysts including α-MnO, β-MnO, γ-MnO, δ-MnO, α-MnO, MnO, etc. This catalyst was easily fabricated using one spot calcination treatment at 500 °C, and a minimal amount of leached Mn ions was detected during the degradation of organic contaminants. The significant performance in persulfate activation was elucidated from the unique structure and physical-chemical properties of α-MnOα-MnO-500. Evidenced by XRD and HRTEM, α-MnOα-MnO-500 consisted of a well mixed phase structure of tetragonal α-MnO and cubic α-MnO with high crystalline quality. XPS and the inhibition effect by phosphate confirmed the existence of surface hydroxyl groups (0.926 mmol g) on α-MnOα-MnO-500, while FTIR, Raman and ionic strength experiments further demonstrated that the formation inner-sphere interaction was the key step in PMS activation. Supported by XPS and CV, the mixed valence states in the α-MnOα-MnO-500 nanocomposite exhibited a more effective redox property, which favored electron transfer between Mn species (Mn ↔ Mn), and generated SO, OH and even O for the degradation of various hydrocarbon contaminants. Also, the activation energy of α-MnOα-MnO-500/PMS for phenol degradation was only 24.7 kJ mol, much lower than that of α-MnO (38.7 kJ mol) and α-MnO (44.9 kJ mol). This Mn catalyst with much lower toxicity can be considered as a green approach in environmental remediation.

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