Remove of a mixture cationics dyes in aqueous solution by a green emulsion liquid membrane

<p style="line-height:200%;margin-bottom:.0001pt;text-align:justify;"><span style="font-family:"Times New Roman","serif";font-size:12.0pt;line-height:200%;" lang="EN-US">The objective of this work is the treatment and purification of an aqueous solution loaded with a mixture of dyes, malachite green (MG) and rhodamine B (Rh-B) using a green emulsified membrane GELM. The proposed GELM process consists of a surfactant (Span 80), an internal phase (sulfuric acid) and a diluent (soybean oil). A Box-Behnken design was implemented to optimize the operating parameters. Three factors were varied: the mass percentage of Span 80, the concentration of the internal phase and a volume ratio V<sub>ext</sub>/V<sub>em</sub>, while keeping the other parameters constant. </span></p><p style="line-height:200%;margin-bottom:.0001pt;text-align:justify;"><span style="font-family:"Times New Roman","serif";font-size:12.0pt;line-height:200%;" lang="EN-US">The results of the optimization give an extraction yield of the dye mixture of 99.77% under the following optimum conditions: </span></p><p style="line-height:200%;margin-bottom:.0001pt;text-align:justify;"><span style="font-family:"Times New Roman","serif";font-size:12.0pt;line-height:200%;" lang="EN-US">10% by mass for Span 80, a concentration of 0.5 M for the internal phase and a V<sub>ext</sub>/V<sub>em</sub> volume ratio of 7.</span></p>