University of Carthage, Tunisia
Title: Decolorisation of two anionic reactive textile dyes by adsorption into MgAl layered double hydroxide in aqueous solutions
Biography: Saber Boubakri
Water contamination has recently become an increasingly severe and pervasive problem for worldwide and the effluents of textile industries have been recognized as a major polluting source, due to the emission of large amounts of wastewaters. Reactive Red-120 (RR-120) and Reactive Blue Bezaktiv-150 (RBB-150) anionic dyes act specifically as the most hazardous chemical compounds classes that elicit adverse effect on aquatic organisms and humans, and need to be treated. In the present study, magnesium-aluminum layered double hydroxide (MgAl LDH) was used as a selective adsorbent for the successful removal of RR-120 and RBB-150 textile dyes from aqueous solutions. Batch adsorption experiments were carried out to investigate the effect of various operating parameters such as initial concentration of dye, contact time, adsorbent dosage, initial pH and temperature in order to provide optimum removal conditions. XRD, FT-IR, SEM and AFM analyses were used to highlight the assembly LDH−Dye. The adsorption process of RR-120 and RBB-150 was found to be at pH of 5 and temperature dependent and followed the pseudo-second order rate model. Also, the equilibrium adsorption data of both dyes were found to adopt the Langmuirtype isotherm model which assumes a monolayer coverage as the adsorption saturates and no further adsorption occurs. Furthermore, the presence of both dyes in competitive adsorption from binary aqueous solution was demonstrated.