Microwave Enhanced Catalytic Degradation of Methyl Orange in Aqueous Solution over CuO/CeO₂Catalyst in the Absence and Presence of H₂O₂

Abstract

This work focuses on the microwave enhanced catalytic degradation of methyl orange (MO) in aqueous solution over CuO/CeO2 catalyst in the absence and presence of H2O2. The prepared CuO/CeO2 catalysts were characterized with X-ray diffraction, Brunnauer-Emmett-Teller analysis, temperature-programmed reduction, and temperature-programmed desorption techniques to elucidate the effect of calcination temperature on its properties and catalytic performance. The results show that calcination temperature exerts remarkable influence on the catalytic performance of CuO/CeO2, with that calcined at 300 °C displaying the highest MO degradation ability. On the basis of Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, and X-ray photoelectron spectroscopy measurement results, the mechanism of MO degradation under microwave irradiation in the presence of both CuO/CeO2 and H2O2 was suggested. A synergistic rather than additive effect of catalyst, microwave irradiation, and H2O2 contributes to the high degradation activity toward MO.

Fenton-like degradation of Bisphenol A catalyzed by mesoporous Cu/TUD-1

“…Cu 2+ /Cu + -containing materials offer interesting alternative catalysts, since they also exhibit Fenton-like oxidation activity [19]. A range of copper catalysts including CuFe/ZSM-5 [20], stabilized CuO nanoparticles [21], CuO/CeO2 [22], Cu-functionalized titanate nanotubes [23] and CuFeO2 [24] have all been explored for their degradation ability towards various water pollutants. Copper promoted mesoporous materials such as MCM-41 [25], mesoporous activated carbon [26], and copper-doped mesoporous silica microspheres [27] have also been reported for Fenton-or photo-Fenton-like pollutant degradation.…”

Band gap energies for white nanosheets/yellow nanoislands/purple nanorods of CeO2

“…[7][8][9] In particular, cerium oxide is one of the most promising materials, exhibiting excellent properties in gas sensors, 10 solar cells 11 and opticalbased non-volatile ash memory. These properties are dominated by their nanostructure and micro-morphology; therefore, various methods such as microwave-assisted thermal decomposition, 24 spray pyrolysis, 25 sol-gel processing 26 and hydrothermal methods 27 have been employed to prepare cerium oxide nanosheets, nanorods, nanowires and nanotubes. These properties are dominated by their nanostructure and micro-morphology; therefore, various methods such as microwave-assisted thermal decomposition, 24 spray pyrolysis, 25 sol-gel processing 26 and hydrothermal methods 27 have been employed to prepare cerium oxide nanosheets, nanorods, nanowires and nanotubes.…”

CuO nanorods from carrier solvent assisted interfacial reaction processes: An unexpected extraordinary Fe-free photocatalyst in sunlight assisted Fenton-like processes

“…First, it has been proposed that CuO can generate oxidative free radicals in the presence of H 2 O 2 through a mechanism similar to the redox procedures commonly accepted for Fe containing oxides in Fenton-like processes [14][15][16][17][18][19][20][21][22][23][24] . The H 2 O 2 molecules adsorbed on the surface of the CuO nanorods are oxidized by the lattice cupric ion, ≡Cu 2 + , to produce hydroperoxyl free radicals, HO 2 [15] .…”

“…CuO has thus been applied as a Fenton-like catalyst [14][15][16] . Most of the work done were with CuO nanoparticles and the degradation efficiencies achieved were not impressive [17][18][19][20][21][22][23][24] . One-dimensional (1D) CuO nanostructures have also been applied as photo-degradation catalysts and showed promising performances [25,26] .…”