| Title | Oxidation of an Azo-Dye via the Photo-Fenton Process under Heterogeneous and Homogeneous Conditions |
|---|---|
| Authors | Riaza-Frutos, Abel , EGEA-CORBACHO LOPERA, ÁGATA, Manzano, Manuel A. , Quiroga, Jose Maria |
| External publication | No |
| Means | Water |
| Scope | Article |
| Nature | Científica |
| JCR Quartile | 2 |
| SJR Quartile | 1 |
| JCR Impact | 3 |
| SJR Impact | 0.724 |
| Web | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85159223017&doi=10.3390%2fw15091787&partnerID=40&md5=801ebbc96572ec584e2ed82c11a2c5eb |
| Publication date | 06/05/2023 |
| ISI | 000988036900001 |
| Scopus Id | 2-s2.0-85159223017 |
| DOI | 10.3390/w15091787 |
| Abstract | In today\'s industries, a diversity of processes give rise to increasing numbers of non-biodegradable compounds that need to be degraded totally or transformed to other less toxic and/or more biodegradable compounds, before their discharge into the environment. One such compound chosen for this study is Orange II, a representative azo-dye that is widely used and easy to monitor in its degradation. The photo-Fenton process was used under heterogeneous and homogeneous conditions to study several different variables. At the end of this research, a comparative study was carried out between the two types of catalysis. It was observed that better results in primary degradation and mineralization were provided by homogeneous catalysis. The photo-Fenton process takes place effectively under heterogeneous and homogeneous catalysis conditions. The process is much faster under homogeneous conditions than under heterogeneous conditions (99.9 and 24% after 90 min, respectively, especially when only 2 ppm of iron in solution is required). Mineralization was observed through total organic carbon, through the variable C/Co as a function of time during photo-Fenton and Orange II degradation, and the data obtained for the final oxidation capacity are in agreement with the experimental percentages of mineralization. A linear fit was observed using the Chan-Chu kinetic model for heterogeneous and homogeneous catalysis. For heterogeneous catalysis, 56% mineralization was reached whereas the model predicts 63%. Regarding homogeneous catalysis, according to the model, 100% mineralization is reached because (1/s) takes a value greater than 1 since the model calculates it on infinite time. |
| Keywords | oxidation; photo-Fenton; wastewater; azo-dye |
| Universidad Loyola members |
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