Polypyrrole–polyaniline-water hyacinth leaf protein concentrate composite for the removal of Cr(VI) from aqueous solution: kinetics, isotherm and thermodynamic studies

ABSTRACT. This work focused on the extraction of “water hyacinth leaf protein concentrate” (WHLPC) and preparation polypyrrole (PPy), polyaniline (PANI) polypyrrole-polyaniline copolymer (PPy/PANI) coated WHLPC by in situ polymerization investigate their application for removal Cr(VI) from aqueous solution. After optimizing experimental conditions like pH, adsorbent dosage, contact time initial concentration it was found that kinetics isotherm data were well fitted to pseudo-second-order Langmuir models, respectively. PPy/PANI/WHLPC be an efficient material compared other polymer-coated adsorbents with maximum adsorption capacity 230 mg/g. The presence counter ions ((NO3-, Cl-, HPO42-, SO42+ HCO3- ions) slightly decreases efficiency PPy/PANI/WHLPC. thermodynamic study reveals onto PPY/PANI/WHLPC is endothermic, thermodynamically feasible, spontaneous. In addition, reusability indicated high two cycles.
 
 KEY WORDS: Polypyrrole, Polyaniline, Protein concentrate, Water hyacinth, Chromium
 Bull. Chem. Soc. Ethiop. 2022, 36(3), 571-584. DOI: https://dx.doi.org/10.4314/bcse.v36i3.7