Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide catalyzed by copper oxide
| Autor: | Hamza Amaouche, Ahmed Réda Yeddou, Abdelmalek Chergui, Salima Chergui, Boubekeur Nadjemi, Aïssa Ould-Dris, Farid Halet |
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| Rok vydání: | 2019 |
| Předmět: |
Copper oxide
Environmental Engineering Cyanide Kinetics 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis Water Purification Reaction rate chemistry.chemical_compound Reaction rate constant Hydrogen peroxide Water Science and Technology Cyanides Aqueous solution Hydrogen Peroxide 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry 0210 nano-technology Oxidation-Reduction Copper Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Water Science and Technology. 80:126-133 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2019.254 |
| Popis: | This work is dedicated to the removal of free cyanide from aqueous solution through oxidation with hydrogen peroxide H2O2 catalyzed by copper oxide nanoparticles. Effects of initial molar ratio [H2O2]0/[CN−]0, catalyst dose, temperature, pH and the catalyst stability on cyanide removal have been investigated. The use of copper oxide has improved the reaction rate showing catalytic activity. The cyanide removal efficiency was increased from 60% to 94% by increasing in the dose of catalyst from 0.5 g/L to 5.0 g/L. Increasing the temperature from 20 °C to 35 °C promotes cyanide removal and the four successive times re-use of catalyst shows good stability. Kinetics of cyanide removal was found to be of pseudo-first-order with respect to cyanide. The rate constants have been determined. |
| Databáze: | OpenAIRE |
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