Details

Autor(en) / Beteiligte

• Liu, Jie
• Zhao, Zhiwei
• Shao, Penghui
• Cui, Fuyi

Titel

Activation of peroxymonosulfate with magnetic Fe3O4–MnO2 core–shell nanocomposites for 4-chlorophenol degradation

Ist Teil von

• Chemical engineering journal (Lausanne, Switzerland : 1996), 2015-02, Vol.262, p.854-861

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •The synthesized Fe3O4–MnO2 core–shell nanocomposites showed high capacity for heterogeneous activation of peroxymonosulfate.•The nanocomposites with Fe/Mn molar ratio of 4 had the highest catalytic activity.•The high activity of catalyst is attributed to the synergetic interaction of Fe3O4 and MnO2.•The catalyst exhibited high stability and good reusability.•The catalytic mechanism was proposed according to the results. Heterogeneous catalysts with low cost, little hazardous, high effective and facile separation from aqueous solution are highly desirable. In this study, magnetic Fe3O4–MnO2 core–shell nanocomposites with various Fe/Mn weight ratios were synthesized through a facile one pot method and then characterized. These as-synthesized solids were applied to activate the peroxymonosulfate (PMS) for 4-chlorophenol degradation. The sample 3 with a Fe/Mn molar ratio of 4:1, which can be separated conveniently through external magnetic field, exhibited higher activity than other Fe3O4–MnO2 nanocomposites, pure MnO2 and physical mixture of Fe3O4 and MnO2. The effects of operational parameters on the catalytic activity of sample 3, including initial Oxone and pollutant dosage, pH and catalyst dosage, were assessed. The catalyst had high stability and good reusability according to five successive repeated reaction. The reactive radicals generated in the PMS/Fe3O4–MnO2 nanocomposites system were sulfate radical (SO4−) and hydroxyl radical (OH). The enhancement of the nanocomposites may be attributed to the interaction of Fe3O4 with MnO2 on the basis of the in situ ATR-FTIR analysis and XPS spectrum.