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Halet F.,Laboratoire Detude Et Of Developpement Des Techniques Of Traitement Et Depuration Des Eaux Et Of Gestion Environnementale Ledtege Ecole Normale Superieure Kouba | Halet F.,University of Boumerdès | Yeddou A.R.,Laboratoire Detude Et Of Developpement Des Techniques Of Traitement Et Depuration Des Eaux Et Of Gestion Environnementale Ledtege Ecole Normale Superieure Kouba | Yeddou A.R.,University of Boumerdès | And 5 more authors.
Journal of Dispersion Science and Technology | Year: 2015

Cyanide is considered one of the most dangerous compounds for the environment. They are discharged by various industries: chemical and metallurgical processes (extraction of gold and silver) and food industries. Adsorption is among the most used processes for elimination of cyanides particularly for the low concentrations. In this work, the cyanide removal is carried out by adsorption onto activated carbons prepared from olive stones and coffee ground. So we can promote this by-product as an inexpensive adsorbent. The prepared activated carbons are characterized by scanning electron micrograph and by determination of the physicochemical properties and specific surface area. All the adsorption experiments were performed in batch mode on synthetic water cyanide (KCN) at pH 10.8–11.0 to avoid volatilization of very toxic HCN. To describe the adsorption kinetics, the kinetic models of pseudo-first-order, pseudo-second-order, and intra-particle diffusion were applied. The experimental equilibrium data for adsorption of free cyanide were analyzed by the Langmuir, Freundlich, and Temkin isotherm models. © 2015, Copyright © Taylor & Francis Group, LLC.


Chergui S.,Laboratoire Detude Et Of Developpement Des Techniques Of Traitement Et Depuration Des Eaux Et Of Gestion Environnementale Ledtege Ecole Normale Superieure Kouba | Yeddou A.R.,Laboratoire Detude Et Of Developpement Des Techniques Of Traitement Et Depuration Des Eaux Et Of Gestion Environnementale Ledtege Ecole Normale Superieure Kouba | Yeddou A.R.,University of Boumerdès | Chergui A.,Laboratoire Detude Et Of Developpement Des Techniques Of Traitement Et Depuration Des Eaux Et Of Gestion Environnementale Ledtege Ecole Normale Superieure Kouba | And 6 more authors.
Toxicological and Environmental Chemistry | Year: 2015

This work is dedicated to the removal of free cyanide from aqueous solution by oxidation with hydrogen peroxide H2O2 catalyzed by neutral activated alumina. Effects of initial molar ratio [H2O2]0/[CN−]0, catalyst amount, pH, and temperature on cyanide removal have been examined. The presence of activated alumina has increased the reaction rate showing thus, a catalytic activity. The rate of removal of cyanides increases with rising initial molar ratio [H2O2]0/[CN−]0 but decreases at pH 10 to 12. Increasing the alumina amount from 1.0 to 30 g/L has a beneficial effect, and increasing the temperature from 20 °C to 35 °C improves cyanide removal. The kinetics of cyanide removal has been found to be of pseudo-first-order with respect to cyanide and the rate constants have been determined. © 2015 Taylor & Francis.

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