A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Kinetics of microwave-enhanced oxidation of phenol by hydrogen peroxide
Abstract Aqueous solutions of phenol were oxidized by hydrogen peroxide assisted by microwave (MW) irradiation. A simple kinetic model for the overall degradation of phenol in the presence of excess H2O2 is proposed in which the degradation rate of phenol is expressed as a linear function of the concentrations of phenol and H2O2. A detailed parametric study showed that the degradation rate of phenol increased with increasing [H2O2] until saturation was observed. Phenol degradation followed apparent zero-order kinetics under MW radiation or H2O2 oxidation. However, after 90 min of irradiation, the observed kinetics shifted to pseudo first order. The overall reaction rates were significantly enhanced in the combined MW/H2O2 system, mainly because microwave could accelerate H2O2 to generate hydroxyl radical (·OH) and other reactive oxygen intermediates. The observed synergetic effects of the MW/H2O2 process resulted in an increased in the net reaction rate by a factor of 5.75. When hydrogen peroxide is present in a large stoichiometric excess, the time required to achieve complete mineralization is reduced significantly.
Kinetics of microwave-enhanced oxidation of phenol by hydrogen peroxide
Abstract Aqueous solutions of phenol were oxidized by hydrogen peroxide assisted by microwave (MW) irradiation. A simple kinetic model for the overall degradation of phenol in the presence of excess H2O2 is proposed in which the degradation rate of phenol is expressed as a linear function of the concentrations of phenol and H2O2. A detailed parametric study showed that the degradation rate of phenol increased with increasing [H2O2] until saturation was observed. Phenol degradation followed apparent zero-order kinetics under MW radiation or H2O2 oxidation. However, after 90 min of irradiation, the observed kinetics shifted to pseudo first order. The overall reaction rates were significantly enhanced in the combined MW/H2O2 system, mainly because microwave could accelerate H2O2 to generate hydroxyl radical (·OH) and other reactive oxygen intermediates. The observed synergetic effects of the MW/H2O2 process resulted in an increased in the net reaction rate by a factor of 5.75. When hydrogen peroxide is present in a large stoichiometric excess, the time required to achieve complete mineralization is reduced significantly.
Kinetics of microwave-enhanced oxidation of phenol by hydrogen peroxide
Zhao, Deming (author) / Cheng, Jie (author) / Hoffmann, Michael R. (author)
2010-12-09
8 pages
Article (Journal)
Electronic Resource
English
An ozone-hydrogen peroxide-microwave-enhanced advanced oxidation process for sewage sludge treatment
| Online Contents | 2007
A Hydrogen Peroxide- Microwave Advanced Oxidation Process for Sewage Sludge Treatment
| Online Contents | 2006
Advanced Oxidation Process Using Hydrogen Peroxide- Microwave System for Solubilization of Phosphate
| Online Contents | 2005
Catalytic wet peroxide oxidation of phenol over Cu–Ni–Al hydrotalcite
| Elsevier | 2011