Comparative Study Between Polyaniline And The Grafted Polyaniline With Chitosan And Their Application In The Removal Of Hexavalent Chromium

THE conductive polymer, polyaniline (PANI) and it's grafting with chitosan (chitosan-grafted polyaniline, CS-g-PANI), were synthesized and analyzed by means of FUR, TGA, TEMand XRD. The two resins were subjected for the adsorption of hexavalent chromium from aqueous solutions. The factors affecting the adsorption processes were tested, such as pH, time, temperature, and the initial concentrations of chromium. Also, both kinetics and equilibrium isotherm models were studied. The results indicated thatthe optimum conditions for the preparation of poly aniline are: APS to aniline ratio is 1.5, the HCI., concentration is 2.5 M, the reaction time is 1.5h and the optimum ratio for the preparation of CS-g-PANIis 1.2. It was also found that the prepared nanoparticles of PANT may reach asize of 23-32 nm and the CS-g-PANT is 26-37 nm. The adsorption of chromium VI by the prepared polymerswere found to follow Langmuire's isotherm with maximum adsorption capacity of 526 mg/g for PAM and 370 mg/g for CS-g-PANI at 60 degrees C. The adsorption mechanism was found to follow the second order model for the two products.