Adsorption of an industrial anionic dye by modified-KSF-montmorillonite: Evaluation of the kinetic, thermodynamic and equilibrium data

KSF-montmorillonite (KSF-Na+) reacted with protonated dodecylamine resulting in an intercalated hybrid material (KSF-DP). The pristine and modified solids were characterized by using CHN elemental analysis, thermogravimetry (TG) and FTIR spectroscopy. The solids were tested for the retention of Remazol brilliant blue R from aqueous solution using batch methods. The effects of the dosage of adsorbent, the contact time, the initial dye concentration, the pH, and, the temperature at the liquid/solid interface were investigated. Both kinetic and thermodynamic parameters of the adsorption process were obtained. The data indicated that the adsorption process is an exothermic and spontaneous reaction that proceeds kinetically according to a pseudo-second-order model. The results suggest that modified KSF-montmorillonite could be employed as a low-cost material for the removal of anionic dyes from aqueous solutions.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Protonated decylamine intercalated on KSF-montmorillonite resulting in a hybrid. ► The hybrid can be used as an adsorbent for removing dyes from aqueous solutions. ► The Langmuir model represented better the retention of dye on modified clay. ► The processes were fitted well the pseudo-second-order model. ► The hybrid is a low-cost material for the removal of anionic dye from solutions.