Abstract
The novel approach of cloud point extraction in the presence of multi-walled carbon nanotubes (CPE/MWCNTs) is presented for removal of Direct Green 26 (DG26) from aqueous solutions. The experiments were conducted based on the Box-Behnken experimental design and the removal process was optimized by the response surface modeling and desirability function (DF) approach. Effects of the experimental variables (MWCNTs amount, solution pH, clouding time and volume of Triton X-100 solution) on the process efficiency were modeled using a quadratic equation with the coefficient of determination (R2) value of 0.9944 and Fisher ratio of 177.07. Using the DF approach, optimum levels of the variables determined as MWCNTs amount of 0.7 mg, pH 3, clouding time of 40 min and Triton X-100 solution volume of 993 µL. Experimental checking of the conditions resulted in the dye removal efficiency of 95.86%. Results of the study proved the applicability of the proposed method for DG26 removal from real water samples.
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