Abstract
AbstractExcellent adsorptive removal of cadmium was accomplished from a pH 1.0 adjusted acidic aqueous solution by using two physically loaded ionic liquids with various hydrophobicity, [Emim+Tf2N−] and [Omim+Tf2N−], on nano-silica sorbents, [Nano-Si-OH-Emim+Tf2N−] and [Nano-Si-OH-Omim+Tf2N−], respectively. Adjusted solutions to a pH 1.0 were found to produce the highest cadmium adsorption capacity values (1.200–1.300 mmol g−1). An anion exchange mechanism was proposed for such high adsorption of cadmium via the exchange of anionic cadmium species by [Tf2N−] anion. Several operational controlling factors were monitored and optimized, including the reaction pH, reaction time, sorbent dose, initial cadmium concentration, interfering ions, and hydrophobicity of ionic liquids. The more hydrophobic ionic liquid, [Omim+Tf2N−], was found to enhance the adsorption efficiency of the modified sorbent in all evaluated controlling factors. Adsorption equilibrium modeling data were fitted to Brauner-Emmet-Teller and ...
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