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2021, Volume 15, Issue 5

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Frontiers of Chemical Science and Engineering >> 2021, Volume 15, Issue 5 doi: 10.1007/s11705-020-1998-6

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

Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, National Demonstration Center for Experimental Comprehensive Chemical Engineering Education, North University of China, Taiyuan 030051, China

Received: 2020-12-31 Accepted: 2021-02-05 Available online: 2021-02-05
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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 -nitrochlorobenzene as a reference compound. The rate constants of NB with ·OH are calculated to be between (1.465±0.113) × 10 L/(mol·s) and (2.497±0.192) × 10 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.

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