Kinetics, Isotherms and Thermodynamic Modeling of Reactive Blue 52 and Reactive Orange 107 dyes from Aqueous Solution Using PANI-CoCl2 as Adsorbent

Abstract

In this work degradation of organic dyes such as Reactive Blue 52 and Reactive Orange 107 by PANI-CoCl₂ composite have been studied.  Polyaniline (PANI) is a viable conducting polymer because of its unique proton dopability, excellent redox recyclability, chemical stability, variable electrical conductivity, low cost and ease of synthesis.  The morphology was characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. It was also shown that many factors affected the adsorption rate, such as adsorbent mass, contact time, variation of pH, agitation speed, dye concentration and temperature. Adsorption of Reactive Blue 52 and Reactive Orange 107 by PANI-CoCl₂ follows pseudo second order kinetics and the best fit isotherm is Langmuir model. The thermodynamic parameters like changes in free energy, enthalpy and entropy were also calculated.