Publications Scientifiques
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Item Cyanide Removal from Aqueous Solution by Oxidation with Hydrogen Peroxide Catalyzed by Copper-Zinc Oxide Nanoparticles(Springer Nature, 2024) Boutrif, Abderrahamane; Chergui, Salima; Halet, Farid; Chergui, Abdelmalek; Boudriche, Lilya; Ould-Dris, Aïssa; Nadjemi, Boubekeur; Yeddou, Ahmed RedaThis work is concerned with the cyanide removal from aqueous solution by oxidation with hydrogen peroxide H2O2 catalyzed by copper zinc oxide (CuO-ZnO) nanoparticles prepared by co-precipitation method. The influences of catalyst dose, hydrogen peroxide concentration, temperature, and catalyst stability on cyanide removal were examined. The use of CuO-ZnO nanoparticles made it possible to increase the reaction rate, thus showing good catalytic activity. The cyanide removal percentage was increased after 75 minutes of reaction time from 70% to 100% by raising the catalyst dose from 0.25 g/L to 1.0 g/L. Increasing the temperature from 24 °C to 35 °C enhanced cyanide removal rate, the apparent activation energy was then found to be equal to 48 KJ/mol. The nanocatalyst was used again for four successive times and exhibited good stability. The kinetics of cyanide elimination was found to be pseudo-first order with respect to cyanide.Item Copper, Zinc And Nickel’s Removal By Bentonite Clay: Case Study In Mono And Multicomponent Systems(Université M'Hamed Bougara Boumerdes, 2019) Hamdache, F.; Chergui, A.; Halet, Farid; Yeddou, A.R.The main purpose of this work is the Copper, Zinc and Nickel’s removal from mono and multi-metal ions aqueous solution using an Algerian bentonite without treatment. The bentonite is characterized using SEM, XRD and X-ray fluorescence. The effect of initial pH and contact time are studied. Under mono and multicomponent systems, the kinetic studies performed at pH 5, indicate that the adsorption follows a pseudo second order model. For both systems, the isotherm data are well correlated with Langmuir model. Whereas the maximum adsorption capacities follow the sequence’s order Cu > Zn > Ni. In the case of multicomponent system, the Cu(II), Zn(II) and Ni(II) adsorptions capacities (58.82, 19.53 and 6.56 mg/g) are lower than the obtained ones for the monocomponent system (58.48, 49.02 and 31.74 mg/g). In addition to that, a mutual competitive effect is observed. Zn(II) and Ni(II) ions adsorption is also inhibited by Cu(II) ions with no change in the maximum Cu(II) adsorption capacity.Item Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of activated carbon prepared from olive stones(Elsevier, 2010) Yeddou, Ahmed Reda; Nadjemi, Boubakeur; Halet, Farid; Ould-Dris, Aïssa; Capart, RichardItem Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of activated alumina(Taylor and Francis, 2015) Chergui, Salima; Yeddou, Ahmed Réda; Chergui, Abdelmalek; Halet, Farid; Amaouche, Hamza; Nadjemi, Boubekeur; Ould-Dris, AïssaItem Removal of cyanide in aqueous solution by oxidation with hydrogen peroxide in presence of copper-impregnated activated carbon(Elsevier, 2011) Yeddou, Ahmed Reda; Chergui, Salima; Chergui, Abdelmalek; Halet, Farid; Amaouche, Hamza; Nadjemi, Boubekeur; Ould-Dris, Aïssa; Belkouch, Jamal