Comparative study of Victoria Blue Basic dye adsorption from aqueous solutions using used cardboard and sawdust
The adsorption of Victoria Blue Basic (VBB) dye on used cardboard (UC) was studied and compared to that on sawdust (SD). UC was characterized by several analytical techniques. The parameters influencing the reaction, such as pH, adsorbent dosage and contact time, were determined. The kinetic study revealed that the surface reaction fits a pseudo-second order model and that intra-particle diffusion is a determining step after the first minutes of contact. The influence of temperature on the adsorption allowed the determination of the thermodynamic parameters (ΔG°, ΔH° and ΔS°). Modeling of the experimental results predicted a spontaneous, endothermic sorption, the retention of which follows an unclear mechanism, between a monolayer and multilayer distribution on the UC. At pH 6, the adsorption capacity of the UC is 205 mg∙g-1, which is five times greater than that of SD.