Retention of Nitrates Discharged from Photovoltaic Baths by Adsorption onto Mg-Al-LDH: Parametric Study

Retention of Nitrates Discharged from Photovoltaic Baths by Adsorption onto Mg-Al-LDH: Parametric Study Nadjet Taoualit *, Khalida Boutemak, Zoubida Chemat-Djenni, Ahlem Douara, Laboratoire des Applications Énergétiques de l’Hydrogène. Université de Blida1, Route de Soumaa, Blida, Algeria Laboratoire d’Analyse Fonctionnelle des Procédés Chimiques. Université de Blida1, Route de Soumaa, Blida, Algeria ntaoualit@hotmail.fr Adsorption of nitrates ions (NO ) from aqueous solutions onto an anionic synthetic clay Mg-Al-LDH has been studied using a batch adsorber. Mg-Al-LDH was prepared by co-precipitation method at constant pH and characterized by X-Ray and FTIR. Nitrates ions adsorption parameters were optimized (contact time, pH, initial NO3 concentration, LDH mass...). Equilibrium isotherm studies were done to evaluate the maximum adsorption capacity of Mg-Al-LDH. The localized exchange sites on the heterogeneous adsorbent surface of Mg-Al-CO3 receive the nitrates species in multilayers with possible interactions between the adsorbed molecules by a chemisorption mechanism. Experimental kinetics data of nitrate adsorption on Mg-Al-CO3 can be well described by the pseudo-second order model. The adsorbed quantities of nitrates at equilibrium is about 33 mg per unit mass of Mg-Al-CO3.