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Published on: June 14, 2018
Kinetic modeling of fenton oxidation of phenol and monochlorophenols
Namgoo Kang1, Dong Soo Lee, Jeyong Yoon
1Graduate School of Environmental Studies, Seoul National University, South Korea.
Abstract:
A kinetic model, consisting of 28 reactions, was proposed to understand the key mechanism of the Fenton oxidation of phenol and o-, m-, and p-chlorophenols. Particular attention is paid to the interactions of the organic intermediates with the Fe species. The proposed model reasonably predicts the decomposition kinetics and by-product formation for the different phenols at widely varying levels of Fe2+, H2O2, and the phenols. For the phenols and intermediates, change in concentrations with time was predicted within 20-30% deviation from the measured data. The single model predicts the overall kinetics of Fenton oxidation of all the tested phenols by adjusting the rate constant of hydroxyl radical for each phenol. Sensitivity analysis indicates that the key reactions are those that directly govern the levels of OH radical and Fe2+. Both the model prediction and the experimental results show that the decomposition rate could be complicated particularly by the availability of Fe2+. Understanding the interactions of the organic intermediates with Fe2+ is thus of critical importance to improve the decomposition performance.
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