Studies on the Removal of Bromocresol Green from Water by Solvent Sublation

Authors: Lu, Yujuan¹; Wei, Bo¹; Wang, Ye²; Li, Jizhen³

Source: Separation Science and Technology, Volume 42, Number 8, June 2007 , pp. 1901-1911(11)

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Abstract:

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.

Keywords: Solvent sublation; mechanism; kinetics; simulation

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01496390601174398

Affiliations: 1: Chemistry and Chemical Engineering College, Shenzhen University, Shenzhen, P. R. China 2: State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, P. R. China 3: Organic Department, College of Chemistry, Jilin University, Changchun, P. R. China

Publication date: 2007-06-01