Solvent Sublation and Adsorbing Colloid Flotation of Acid Red

Acid Red 114. an anionic dye, was removed from aqueous solution by solvent sublation of Acid Red-hexadecyltrimethylammonium complex into paraffin oil. 95% of Acid Red was removed from the solution in 5 min by solvent sublation. A stoichiometric amount of surfactant (1 mol surfactant to 1 mol dye) was found to be most effective for Acid Red removal. The effect of neutral salts and ethanol on solvent sublation was studied. Adsorbing colloid flotation of Acid Red with Fe(OH) 3 floc and sodium lauryl sulfate was very effective, with 99% of Acid Red removal in 5 min. Adsorbing colloid flotation of Acid Red with Al(OH) 3 floc was also effective, with 99% of Acid Red removal in 3 min. The effect of neutral salts on adsorbing colloid flotation was studied.