Oxidative decomposition of atrazine by a Fenton-like reaction in a H2O2/ferrihydrite system
| Autor: | Ladislau Martin-Neto, Milton Duffles Capelato, Juliana Cristina Barreiro, Hans Christian Bruun Hansen |
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| Rok vydání: | 2007 |
| Předmět: |
Environmental Engineering
Chemistry Iron Ecological Modeling Inorganic chemistry chemistry.chemical_element Hydrogen Peroxide Oxidative phosphorylation Hydrogen-Ion Concentration Ferric Compounds Pollution Decomposition Oxygen Kinetics chemistry.chemical_compound Ferrihydrite Degradation (geology) Atrazine Hydrogen peroxide Oxidation-Reduction Waste Management and Disposal Dissolution Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Water Research. 41:55-62 |
| ISSN: | 0043-1354 |
| Popis: | The oxidation of atrazine (ATZ) was studied in the presence of hydrogen peroxide (H(2)O(2)) and ferrihydrite at different concentrations and pHs. The rate of ATZ oxidation increased with H(2)O(2) concentration and is independent of pH ranging from 4 to 8. However, at pH 3 an increase of ten times in the rate of ATZ oxidation was observed due to the mineral dissolution. The decomposition rate of H(2)O(2) was three times higher at pH 8 than 3 and increased with increase of both H(2)O(2) and ferrihydrite concentrations. The results indicate that ferrihydrite controls oxidation of ATZ by H(2)O(2) in two different ways: (i) mineral dissolution at low pH allowing the Fenton reaction to proceed in solution and (ii) surface-mediated decomposition of H(2)O(2) producing non-reactive oxygen species in particular at higher pH. Three degradation products (desethylatrazine, desisopropylatrazine, and 2-hydroxyatrazine) were identified and corroborate with a Fenton reaction taking place in solution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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