Removal of remazol brilliant blue r from aqueous solution by adsorption using a calcined layered double hydroxides [Zn2-Al-CO3]

In this work,we studied adsorption of a textile dye namely remazol brilliant blue r (rbbr) by calcined layered double hydroxide (cldh). this material was synthesized by the coprecipitation method of constant ph 10 with a metal ratio zn/al = 2 and it is calcined at a temperature of 500°c for 5 h. these materials have great potential for removing effluent pollutants. it was aimed to study the performance of a calcined [zn2-al-co3] for the removal of rbbr and optimizes experimental parameters such as contact time,ph and mass ratio rbbr/cldh. the retention kinetics follows the pseudo-second order model which involves chemisorption mechanism. the adsorption isotherms are of type h and are in good agreement with the langmuir model. the results of xrd and ir indicate that the retention is governed by adsorption of the textile dye to the available sites on the surface and by intercalation between the ldh layers reconstructed. the removal of rbbr in anionic form by cldh gave satisfactory results,the retention is total (100%) when the mass ratio rbbr/cldh is between 0.20 and 0.40 and the retention capacity reached 1000 mg/g. © 2017,university of mohammed premier oujda morocco.