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Kinetics and Mechanism of Nitrobenzene Degradation by Hydroxyl Radicals-based Ozonation Process Enhanced by High Gravity Technology by Weizhou Jiao; Shengjuan Shao; Peizhen Yang; Kechang Gao; Youzhi Liu is a Engineering article available to read on EtoBox.

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This study investigated the indirect oxidation of nitrobenzene (NB) by hydroxyl radicals ($OH) in a rotating packed bed (RPB) using competitive kinetics method with p-nitrochlorobenzene as a reference compound. The rate constants of NB with $OH are calculated to be between (1.465AE0.113) Â 10 9 L/(mol$s) and (2.497AE0.192) Â 10 9 L/(mol$s). The experimental data are fitted by the modified Arrhenius equation, where the activation energy is 4877.74 J/mol, the order of NB concentration, rotation speed, and initial pH is 0.2425, 0.1400 and 0.0167, respectively. The ozonation process of NB could be enhanced by RPB, which is especially effective for highly concentrated NB-containing wastewater under alkaline conditions. The high gravity technology can accelerate ozone mass transfer and selfdecomposition of ozone to produce more $OH, resulting in an increase in the indirect oxidation rate of NB by $OH and consequently effective degradation of NB in wastewater.

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Author

Weizhou Jiao; Shengjuan Shao; Peizhen Yang; Kechang Gao; Youzhi Liu

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Engineering (Physical Sciences)