Details

Autor(en) / Beteiligte

• Huang, Yulin
• Tian, Xike
• Nie, Yulun
• Yang, Chao
• Wang, Yanxin

Titel

Enhanced peroxymonosulfate activation for phenol degradation over MnO2 at pH 3.5–9.0 via Cu(II) substitution

Ist Teil von

• Journal of hazardous materials, 2018-10, Vol.360, p.303-310

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •In-situ Cu(II) doped in framework of mesoporous MnO2, Cu-MnO2 was prepared.•Cu-MnO2 had good catalytic activity and stability for phenol degradation by PMS.•Exposed surface oxygen defect was responsible to the enhancement of PMS activation. Cu(II) doped mesoporous MnO2 (Cu-MnO2) was prepared to establish an intimate functional link between the structure substitution and catalytic peroxymonosulfate (PMS) activation. Based on the characterization of powder X-ray diffraction (XRD), N2 adsorption-desorption measurement, scanning electron microscope (FE-SEM) and transmission electron microscope (TEM), Cu-MnO2 had a typical long range ordered mesoporous structure and Cu was successfully introduced in octahedral framework. It exhibited excellent catalytic activity and stability for the phenol degradation by PMS. Phenol was always efficiently degraded over Cu-MnO2 at a pH range of 3.5–9.0. For example, the reaction rate constant at pH 7.0 was 0.073 min−1, which was two times higher than that of MnO2 (0.039 min−1). Importantly, 1O2 was identified as the primary reactive species in Cu-MnO2/PMS system. X-ray photoelectron spectroscopy (XPS) confirmed that more exposed surface oxygen defects due to Cu doping were responsible to the enhancement of PMS activation for phenol degradation. The results of PMS decomposition and oxygen evolution indicated that surface oxygen defects lower the reaction energy barrier of PMS decomposition by generating 1O2 via the energy trapping by oxygen. Finally, the heterogeneous PMS activation mechanism over Cu-MnO2 was proposed.