Degradation of herbicide S-metolachlor by electrochemical AOPs using a boron-doped diamond anode
| Autor: | Fábio Gozzi, Amilcar Machulek, Sílvio C. de Oliveira, Ignasi Sirés, Diego R.V. Guelfi, Enric Brillas |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Inorganic chemistry
02 engineering and technology 010501 environmental sciences engineering.material Electrochemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound law 0105 earth and related environmental sciences Depuració d'aigües residuals Chemistry Purification of sewage Diamond Oxidació electroquímica General Chemistry Mineralization (soil science) 021001 nanoscience & nanotechnology Cathode Anode Electrolytic oxidation engineering Degradation (geology) 0210 nano-technology Metolachlor |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2017.10.026 |
| Popis: | The degradation and mineralization ability of electrochemical processes like electro-oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and UVA-assisted photoelectro-Fenton (PEF) has been comparatively studied for solutions of the herbicide S-metolachlor. Solutions of 100 mL have been treated using an undivided cell equipped with an air-diffusion cathode and a boron-doped diamond (BDD) anode. The effect of pH, current density, and Fe2+ and S-metolachlor concentrations has been thoroughly studied. The total organic carbon removal profiles have demonstrated the feasibility of almost overall mineralization by EF and PEF after 9 h at 300 mA. The herbicide decays in both treatments informed about the complexation of Fe(III) ions formed from Fenton’s reaction, which decelerated S-metolachlor removal. However, the high oxidation power of BDD anode allowed the gradual mineralization of such complexes. The identification of chlorinated and non-chlorinated degradation byproducts by GC–MS has allowed the proposal of main degradation routes. |
| Databáze: | OpenAIRE |
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