Abstract
The present paper deals with the synthesis of a novel and ecofriendly Xanthan gum/Methionine-bentonite (XG/Meth-bent) nanocomposite and was further explored for the removal of toxic congo red dye (85%) from aqueous solution. The nanocomposite was characterized by various techniques such as SEM, FTIR, XRD, TGA and zeta potential analysis. The surface area of bentonite and nanocomposite were found to be 23mg2g−1 and 71mg2g−1 respectively. The maximum adsorption was found at pH 3, contact time 60min and temperature 323K respectively. The point of zero charge was found to be 7. The adsorption isotherm and kinetic were best fitted by Langmuir isotherm and pseudo-second order kinetic model with Langmuir monolayer adsorption capacity 530.549mgg−1 at 323K. Thermodynamic studies showed that the adsorption was endothermic, spontaneous with increased randomness at solid/solution interface. Desorption with regeneration (upto fifth cycle) was best observed by NaOH.
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