Adsorption of manganese ion using polyaniline and it's nanocomposite: Kinetics and isotherm studies

In this research, the preparation of polyaniline (PAn) nanocomposite as adsorbent and it's capability in manganese removal was investigated. The PAn nanocomposites were prepared using different kind of surfactants such as hydroxypropylcellulose (HPC), poly (vinyl pyrrolidone) (PVP), poly (vinyl alcohol) (PVA) and poly (ethylene glycol) (PEG) in the presence of KIO3 as an oxidant. The products were characterized in terms of morphology and chemical structure with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Batch studies were performed to evaluate the influence of various experimental parameters including pH, adsorbent dosage, and contact time. Optimum conditions for manganese removal were found to be pH 10, adsorbent dosage of 10 g/L and equilibrium time 30 min. Also, the kinetic of adsorption system have been studied based on the assumption of pseudo-second order rate law. The experimental results have been analyzed using a pseudo-Langmuir adsorption isotherm and a pseudo-Freundlich adsorption isotherm models. The Freundlich adsorption isotherm model was found to represent the measured sorption data better than Langmuir adsorption isotherm. According to the evaluation using the pseudo-Freundlich model, the monolayer adsorption capacity (q(max)) of PAn for manganese ions was obtained to be 50.251 mg/g. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.