Cellulose -Polyvinylalcohol supported magnetic nanocomposites from lentil husk for sequestration of cationic dyes from the aqueous solution: Kinetics, isotherm and reusability studies.

The study emphasize on the synthesis of eco-friendly cellulose based magnetic nanocomposite derived from Lens cullnaris husk and Poly Vinyl Alcohol (FeO@LENT/PVA) for the adsorption of Crystal Violet, Methylene Blue and Malachite Green Dye. The structural and functional morphology was determined by SEM-EDAX analysis and FTIR. The crystalline of FeO@LENT/PVA was analyzed by XRD and pore size was determined by BET. The surface area of nanocellulose FeO@LENT/PVA was found to be 22.308 m/g and the pore volume of 0.074cm/g. The FeO@LENT/PVA nanocomposites show successful adsorption of CV, MB and MG in 120 min equilibrium time at pH 7 for CV and 8 for MB and MG respectively. The FeO@LENT/PVA nanocomposites was best fitted Langmuir isotherm and follows pseudo 2nd order kinetics with intra particle as rate controlling mechanism. The nanocellulose FeO@LENT/PVA composite shows good monolayer adsorption capacity in the order of CV(357 mg/g) > MB(112.35 mg/g) > MG(111.11 mg/g). Thermodynamic study reveals the process is endothermic and spontaneous in nature with ΔG value less than 20KJ mol at respective temperatures indicating Physiosorption. The nano-cellulose FeO@LENT/PVA composite can be effectively desorb dyes by 0.1 M NaOH. The nanocellulose FeO@LENT/PVA composite proves to be an effective adsorbent showing regeneration ability upto five times for all the dyes.