Adsorption behaviors of anionic and cationic dyes on ionic liquid-modified silica gel as sorbent

摘要

In this study, adsorption behaviors of typical anionic (red congo (RC)) and cationic (methylene blue (MB)) dyes on new synthesized [C(8)mim][PF6]-modified silica gel sorbent were examined. Outstanding differences were observed in adsorption behaviors of studied dyes on synthesized sorbent. The most percent adsorption of RC molecules was related to acidic pH values, while basic pH values were more effective than acidic ones for adsorption of MB molecules. Adsorption of RC molecules on sorbent was exothermic, but temperature had no considerable effect on MB adsorption. Thermodynamic parameters such as Gibbs free energy change of dyes partitioning (