Abstract

The present study investigates the effects of additives on the cloud point temperature of Triton X-100 as a non-ionic surfactant in aqueous solutions (% of Triton X-100,% of salts (NaCl, Na₂S₂O₃, Na₂SO₄, KI, KBr, KNO₃), and concentrations of synthesized ionic liquids (Thiocyanate trioctylmethyl ammonium (LI₁), Hydrogenophosphatetrioctylmethyl ammonium (LI₂)). The parametric study based on the experimental design methodology by means of 2⁴ factorial design, allows us to predict the effect of the main parameters pH (4.0-8.0), percent mass of Triton X-100 (2-10%), Na₂SO₄ (8-10%) and Red Bemacid dye concentration (10-100ppm) with 100ppm of synthetic ionic liquids on the extraction efficiency of the dye.The extraction using the CPE process (Cloud Point Extraction) of Red Bemacid showed to be efficient, reaching values of more than 100% dye recovery in optimum conditions using these two ionic liquids.

Keywords: Red bemaciddye; Ionic liquids; Non-ionic surfactant; Additives; Cloud point extraction; Factorial design