Investigation of the adsorption abilities of Cu2+ in aqueous media by polyaniline-lotus seed pod composite

Abstract

Composites based on polyaniline (PANI) and lotus seed pod (PANI-lotus seed pod) were synthesised by a chemical method in a hydrochloric acid environment with the presence of persulfate ammonium oxidant. Material structure characteristics were evaluated through FTIR analysis, material surface morphology was analysed by SEM image, the specific surface area was determined by BET method. The concentration of Cu²⁺ ions before and after adsorption was determined by atomic absorption spectrometry (AAS). Experimental results showed that the appropriate pH for adsorption of Cu²⁺ was 5.0. Time to reach the adsorption equilibrium of Cu²⁺ was 90 minutes. The adsorption was well described by the isothermal adsorption model Langmuir with the maximum adsorption capacity of 25.91 mg/g. PANI-lotus seed pod of adsorption kinetics Cu²⁺ followed pseudo-second order kinetics of Lagergren.