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Separation Science and Technology, Vol.42, No.8, 1901-1911, 2007
Studies on the removal of bromocresol green from water by solvent sublation
Bromocresol green (BG) was removed from an aqueous solution by solvent sublation of bromocresol green-hexadecyl- pyridiumchlorid (HPC) complex (sublate) into 2-octanol. The effects of many parameters, such as the amount of surfactant, airflow rates, pH, NaCl, and ethanol on the solvent sublation were studied. Different temperatures of the solvent sublation were also investigated. A ratio of surfactant to dye (1.25:1) was the most effective for the removal, with over 99% BG removed from the aqueous solution within 5 min. The removal rate was somewhat enhanced by higher airflow rates and almost independent of the volume of the organic solvent floating on the top of the aqueous column. The effects of electrolytes (e.g. NaCl) and non- hydrophobic organics (e. g. ethanol) reduce the removal efficiency of solvent sublation. This process followed first order kinetics. A characteristic parameter, apparent activation energy of attachment of the sublate to bubbles, was estimated at a value of 1.3 kJ/mol. Furthermore, the simulation of the mathematical and experimental data was made with good results.