Adsorption of Reactive Dyes Red 195, Blue 222, and Yellow 145 in Solution with Polyaniline-Chitosan Membrane Using Batch Reactor

Abstract

The objective of this work was to investigate the characteristics of polyaniline-chitosan membrane by SEM, FTIR, tensile strength and percentage elongation and to determine the adsorption behavior of reactive dyes (Yellow 145, Red 195, Blue 222) onto the polyaniline-chitosan membrane. The removal of reactive dyes was investigated in a batch experiment. Parameters influencing the adsorption including pH (2-10), contact time (0-150 min), equilibrium study (30 min to 16 h) and initial concentration (10, 25, 50, 100, 250 and 500 mg×L-1) were studied at room temperature. The dye concentrations were determined by a UV/VIS Spectrophotometer at the wavelengths 423, 540 and 620 nm for Yellow 145, Red 195 and Blue 222, respectively. The results indicated that the tensile strength and percentage elongation of polyaniline-chitosan membrane were 0.032 kN/mm2 and 15.53%, respectively. It was found that optimum pH for adsorption of all dyes on polyaniline-chitosan membrane was pH 2. When the adsorption time increased, the adsorption efficiency increased accordingly. The adsorption equilibrium was found to be reached at 3 h in all adsorptions. Moreover, the isotherm study showed that the polyaniline-chitosan membrane adsorption corresponded to Freundlich model. Moreover, it was also found that polyaniline-chitosan membrane exhibits higher adsorption efficiency for reactive dyes than chitosan.