Transactions of Nanjing University of Aeronautics & Astronautics
Formation and Role of H2O2 During Ozonation of Nitrobenzene
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Abstract:
To better understand the formation of H2O2 in the ozonation of nitrobenzene and its role for the oxidation, a batch reactor of nitrobenzene ozonation was set up. The variables such as pH value, ozone dosage, and the presence of hydroxyl radical scavenger were investigated. The results showed that high accumulations of H2O2 were generally formed at low pH values and low ozone dosages. Moreover, H2O2 mainly formed after nitrobenzene was oxidized by hydroxyl radical during ozonation of the intermediates, such as p-nitrophenol, which reacted with ozone quickly in water. A small amount of additional H2O2 enhanced the nitrobenzene removal slightly. The kinetic study showed that nitrobenzene degradation fitted with pseudo-second-order kinetics well in the experiment. The kinetic constant values correlated linearly with the concentrations of H2O2 added. Thus, it is expected that the H2O2 formed in oxidation of nitrobenzene may initiate ozone decomposition to form hydroxyl radical and finally enhance the degradation of aromatic compounds to a certain extent.
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Supported by the National Natural Science Foundation of China (21407077); the Postdoctoral Science Foundation of Jiangsu Province (1002013C); the Fundamental Research Funds for the Central Universities (308201NS2012079); the Priority Academic Program Development Fund of Jiangsu Higher Education Institutions.
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