Remediation of Anionic Dye (Bromphenol Blue) from Aqueous Solutions by Solvent Sublation
Background. The accumulation of toxic effluent components is a considerable hazard to water resources potential of the country. It particularly relates to waste water pollutants belonging to II–IV hazard classes such as organic dyes and diluents.
Objective. The goal of this research was to investigate the main principles of Bromphenol Blue remediation from water by solvent sublation technique and to determine optimum process conditions.
Methods. Bromophenol blue (BB), an anionic dye, was removed from aqueous solution by solvent sublation of a BB – hexadecylpyridium complex (sublate) into isopentanol. The pH of the solution was determined by potentiometric method. Dye concentrations of the sample solutions were measured with the use of absorption spectroscopy.
Results. The effects of the following parameters on the solvent sublation were experimentally studied: the molar ratio of hexadecylpyridium chloride (HPC) to BB, pH of the aqueous phase, the removal process duration, type of organic solvent, the size of bubbles generated in the sparger and the addition of electrolytes (like KCl) and nonhydrophobic organic compounds (like ethanol). By making central composite orthogonal design and deriving second order mathematical model with the aid of MS Excel 2003 it was found that the maximum efficiency of depicted process can be attained in a case of carrying it out under the following optimum conditions: temperature 10 °C, surfactant/dye molar ratio 1.94:1; process duration – 15.3 min.Conclusions. Within this research the main principles of Bromophenol Blue removal from water by solvent sublation were investigated. The second order experiment statistical model was derived with the use of central composite orthogonal design. The maximum relative standard deviation was equal to 4,7 %. Optimum conditions were determined: According to obtained results the highest level of BB elimination reached within the experiment was equal to 97.5 % and the residual dye content didn’t exceed the maximum allowable concentration (the M.A.C.) of acidic dyes 0.25 mg/dm3.
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