Recovery of 4-chlorophenol from an aqueous solution by ELM: stability of the membrane, modeling, and optimization of the extraction using experimental designs

摘要

An emulsified liquid membrane has been developed for the extraction of the 4-chlorophenol (4-CP) from an aqueous effluent. The membrane used was an emulsion of water in oil (W/O), the internal phase was an alkaline solution (NaOH), and the organic phase was a mixture of a surfactant (SPAN 80) and an extractant (TBP) dissolved in an organic solvent (heptane). The only limitation of this technique was the stability of the membrane (swelling, cohesion, and rupture). To optimize the different parameters that have a direct influence on the stability of the membrane, experiments were conducted using a fractional factorial design of Plackett-Burman. The obtained results showed the behavior of the emulsified membrane under different operating conditions. Among the different factors studied, the concentrations of SPAN 80 of TBP and the stirring velocity appeared to be the most important parameters. Indeed, a high yield above 99% almost a total elimination of 4-CP was achieved under optimized operating conditions determined by response surface methodology using a full factorial design.