Separation of Cationic Dyes Using a Green Emulsion Liquid Membrane Based on Non-Ionic Polysorbate Surfactants

In the present research, the stability and extraction rate for cationic dyes using two non-ionic surfactants, polysorbate ۲۰ and ۸۰, in an emulsion liquid membrane containing edible green solvent were investigated. The ELM phase was prepared using several concentrations of the surfactants, D۲EHPA as the carrier, and NaOH as the internal phase. The effects of surfactant concentration, carrier concentration, and stirring speed at extraction stage and the stability of the membrane phase were studied. The results showed that at an optimum condition, a separation of more than ۹۰% could be achieved for cationic dyes using green ELM.