Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 180, Issue -, Pages 189-198Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.06.014
Keywords
Aromatic compounds; Electrochemical advanced oxidation processes; Hydroxyl radical; Mathematical modelling; Oxidation by-products; Sensitivity analysis
Funding
- University of Paris-Est
- European Commission [2010-0009]
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A new approach of electro-Fenton modelling is proposed with phenol (PH) as a target contaminant. Five representative steps involved in the process have been considered: (i) H2O2 in situ generation, (ii) Fenton's reaction in bulk solution, (iii) Fe2+ (catalyst) electroregeneration, (iv) scavenging reactions (v) oxidative degradation and mineralization of PH as target pollutant. A new complete mineralization pathway of PH is proposed by gathering many intermediates that were found in different papers in literature and by adding some other ones to complete the oxidation route. A total number of 27 oxidation by-products of PH are considered, which represents 28 differential equations including PH. A sensitivity analysis of secondorder kinetic parameters has been performed. It confirms the usefulness of the 49 kinetic reactions that have been taken into account and the importance of the five steps of the process, especially the fourth one. Based on existing parameter values found in literature, kinetic parameter estimations have been performed in order to better fit the experimental results. The model efficiency (ME), the root mean square error (RMSE) and the index of agreement (IoA) calculated to evaluate the performance of the model compared with experimental data have shown respectable values, which validate the model and the pathway. This model represents new understandings in mechanisms that occur during electrochemical advanced oxidation processes. It also improves the prediction of the concentration profiles of aromatic organic compounds and their intermediates. (C) 2015 Elsevier B.V. All rights reserved.
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