Title

2D/2D nano-hybrids of y-MnO2 on reduced graphene oxide for catalytic ozonation and coupling peroxymonosulfate activation

Document Type

Journal Article

Publisher

Elsevier

School

School of Engineering

RAS ID

21150

Comments

Wang, Y., Xie, Y., Sun, H., Xiao, J., Cao, H., & Wang, S. (2016). 2D/2D nano-hybrids of γ-MnO 2 on reduced graphene oxide for catalytic ozonation and coupling peroxymonosulfate activation. Journal of hazardous materials, 301, 56-64. Available here.

Abstract

Two-dimensional reduced grapheme oxide (2D rGO) was employed as both a shape-directing medium and support to fabricate 2D γ-MnO2 /2D rGO nano-hybrids (MnO2/rGO) via a facile hydrothermal route. For the first time, the 2D/2D hybrid materials were used for catalytic ozonation of 4-nitrophenol. The catalytic efficiency of MnO2 /rGO was much higher than either MnO2 or rGO only, and rGO was suggested to play the role for promoting electron transfers. Quenching tests using tert-butanol, p-benzoquinone, and sodium azide suggested that the major radicals responsible for 4-nitrophenol degradation and mineralization are O2 – and 1O2 , but not •OH. Reusability tests demonstrated a high stability of the materials in catalytic ozonation with minor Mn leaching below 0.5 ppm. Degradation mechanism, reaction kinetics, reusability and a synergistic effect between catalytic ozonation and coupling peroxymonosulfate (PMS) activation were also discussed.

DOI

10.1016/j.jhazmat.2015.08.031

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