Kinetics and mechanism of nitrobenzene degradation by hydroxyl radicals-based ozonation process enhanced by high gravity technology

Abstract

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 (1.465±0.113) × 10⁹ L/(mol·s) and (2.497±0.192) × 10⁹ 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 self-decomposition 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.

Key words： high gravity technology; hydroxyl radicals; nitrobenzene; reaction kinetics

Acknowledgements

This work was supported by the Specialized Research Fund for Sanjin Scholars Program of Shanxi Province (No. 201707), Key Research & Development Plan of Shanxi Province (No. 201903D321059), Shanxi Scholarship Council of China (No. HGKY2019071), and Transformation and Cultivation Projects of Scientific and Technological Achievements of Higher Education Institutions for Shanxi Province (No. 2020CG040).

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