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Highly efficient α-Mn2O3@α-MnO2-500 nanocomposite for peroxymonosulfate activation: comprehensive investigation of manganese oxides

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Abstract

In this paper a nanorod α-Mn2O3@α-MnO2-500 nanocomposite demonstrated the highest efficiency and remarkable stability in persulfate activation compared with other manganese oxide based catalysts including α-MnO2, β-MnO2, γ-MnO2, δ-MnO2, α-Mn2O3, Mn3O4, 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-Mn2O3@α-MnO2-500. Evidenced by XRD and HRTEM, α-Mn2O3@α-MnO2-500 consisted of a well mixed phase structure of tetragonal α-MnO2 and cubic α-Mn2O3 with high crystalline quality. XPS and the inhibition effect by phosphate confirmed the existence of surface hydroxyl groups (0.926 mmol g−1) on α-Mn2O3@α-MnO2-500, 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-Mn2O3@α-MnO2-500 nanocomposite exhibited a more effective redox property, which favored electron transfer between Mn species (MnIV ↔ MnIII), and generated SO4˙, ˙OH and even 1O2 for the degradation of various hydrocarbon contaminants. Also, the activation energy of α-Mn2O3@α-MnO2-500/PMS for phenol degradation was only 24.7 kJ mol−1, much lower than that of α-MnO2 (38.7 kJ mol−1) and α-Mn2O3 (44.9 kJ mol−1). This Mn catalyst with much lower toxicity can be considered as a green approach in environmental remediation.

Graphical abstract: Highly efficient α-Mn2O3@α-MnO2-500 nanocomposite for peroxymonosulfate activation: comprehensive investigation of manganese oxides

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Publication details

The article was received on 09 Sep 2017, accepted on 10 Dec 2017 and first published on 12 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA07942G
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Highly efficient α-Mn2O3@α-MnO2-500 nanocomposite for peroxymonosulfate activation: comprehensive investigation of manganese oxides

    A. Khan, H. Wang, Y. Liu, A. Jawad, J. Ifthikar, Z. Liao, T. Wang and Z. Chen, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA07942G

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