The vanadium-substituted heteropolytungstate catalyzed oxidation of the organic dye by H2O2 in an aqueous solution
| Autor: | Hadria Ferdenache, Mostefa Abbessi, Ouahiba Bechiri |
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| Rok vydání: | 2020 |
| Předmět: |
Arrhenius equation
Aqueous solution Chemistry General Chemical Engineering Enthalpy Inorganic chemistry General Engineering General Physics and Astronomy Vanadium chemistry.chemical_element Activation energy Endothermic process Catalysis chemistry.chemical_compound symbols.namesake symbols General Earth and Planetary Sciences General Materials Science Hydrogen peroxide General Environmental Science |
| Zdroj: | SN Applied Sciences. 2 |
| ISSN: | 2523-3971 2523-3963 |
| Popis: | The main objective of this work is to study the oxidation of the acid orange 7 (AO7) in an aqueous solution by using the hydrogen peroxide in the presence of vanadium substituted heteropolytungstate (α1P2W17VO62)6− as a catalyst. The effects of various experimental parameters on the oxidation reaction of the dye were investigated. And they are as follow: The H2O2 concentration, the mass of the catalyst, and the dye concentration. The optimum conditions were determined. In addition, it was found that the efficiency of the degradation is obtained after 80 min of reaction, and it was about 100%. The optimal parameters were: initial pH = 4; [H2O2]0 = 1 mM; catalyst mass = 0.05 g; for a concentration of the dye [AO7]0 = 2 mg/L. The kinetic oxidation of the AO7 by this catalytic system was also elucidated and based on experimental data. The oxidation of the AO7 follows a pseudo second-order Kinetic model. The activation energy, as well as the activation enthalpy and the entropy were calculated by using respectively the Arrhenius and the Eyring equations. The oxidation of the AO7 by the H2O2 and the (α1P2W17VO62)6− requires a small amount of energy and has an endothermic nature. |
| Databáze: | OpenAIRE |
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