Solvent sublation, originally introduced by Sebba, has shown promising features for removing hydrophobic compounds and ions from aqueous systems.The removal of the Zn ion as the Zn-dithizone complex, [(C13H12N4S)2Zn2+], from aqueous solutions was studied based on the solvent sublation of [(C13H12N4S)2Zn2+]-cetyltrimethyl ammonium bromide (CTAB) (sublate) into isopentanol. The experimental conditions, such as the pH, the ratio of surfactant to Zn complex and the effects of electrolytes, were optimized. More than 98% Zn ions can be removed from the aqueous solution within 1 hr with the ratio of 5:1 of surfactant to Zn-dithizone complex. The removal efficiency increased dramatically with the treatment of 0.5 M NaCl. The removal rate was somehow enhanced at higher airflow rate. Further, it was independent of the volume of the organic solvent floating on the top of the aqueous column. According to thermodynamic studies, this process is consistent with the first order kinetics. The apparent activation energy of the attachment of sublates to bubbles was estimated to be 9.04 kJ/mol. A mathematical model for the [(C13H12N4S)2Zn2+]-surfactant was obtained based on the complete transport mechanism. In addition, the simulation of the mathematical and experimental data was consistent.Figure1. Simulation of experimental results for the solvent sublation of [(C13H12N4S)2Zn2+]- CTAB, the line represents for the theoretical result; the circle represents the experimental result, CZn= 2.55�10-5 mol/L; CCTAB = 1.275�10-4 mol/L.

Investigation on the removal of Zn ion by solvent sublation

245th National Meeting (2013)

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