Abstract
Metal oxides (manganese oxide, MnO, manganese dioxide, MnO2, copper oxide, CuO, zinc oxide, ZnO and nickel oxide, NiO) doped carbon aerogel (CA) were prepared and used as catalysts in heterogeneous oxidation of phenol from aqueous solution in a three-dimensional (3D) electrode reactor. Textural characterization of metal oxides doped CA showed that the metal oxide nanoparticles are dispersed separately throughout the carbon matrix. The experimental results showed that phenol was degraded mainly by hydroxyl (•OH) radicals. The presence of metal oxides accelerated •OH radical generation. The •OH radical quantity depends on the type of metal oxide. The n-type semiconductor was more active than p-type semiconductor for •OH radical generation. Furthermore, acceleration effect of •OH radical generation catalyzed by metal oxides doped CA was investigated and demonstrated.
Highlights
Wastewater containing phenolic compounds cannot be degraded completely through conventional processes because of their poor biodegradability
The metal oxides manganese oxide (MnO), CuO, zinc oxide (ZnO), MnO2 and nickel oxide (NiO) are used as catalysts for the oxidation of phenol in aqueous solutions, their electrocatalytic oxidation were performed in the 3D electrode reactor using metal oxides-doped carbon aerogel (CA)
Metal oxides-doped CA have been prepared and used as particle electrode materials, and the metal oxide particles were dispersed separately throughout the carbon matrix, the particle size was centering between 15-30 nm
Summary
Wastewater containing phenolic compounds cannot be degraded completely through conventional processes because of their poor biodegradability. Electrocatalytic Oxidation Removal of Phenol from Aqueous Solution with Metal Oxides Doped Carbon Aerogel J. In this study CA particles were used as particle electrodes and catalyst supports, while manganese oxide (MnO), manganese dioxide (MnO2), copper oxide (CuO), zinc oxide (ZnO) and nickel oxide (NiO) were used as catalyst candidates. The goals of this investigation were to investigate the relationship between the phenol removal by metal oxides doped CA and the kind of metal oxides as well as to quantity OH radicals generation.
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