KG-Gl-PVA Semi-IPN Microspheres: Synthesis, Characterisation, BBY Adsorption And Potential Applications

Abstract

Glutaraldehyde crosslinked semi-interpenetrating polymeric network (SIPN) microspheres of katira gum (KG)and polyvinyl alcohol (PVA) has been synthesized by using water in oil emulsion technique. Spherical shape of prepared microspheres was studied by Labovision microscope fitted with micam 2.0 digital camera. Modification in functional groups and structure was studied by FTIR spectroscopy, ¹H NMR and X-ray diffraction. Thermal properties were studied by Thermogravimetric analysis and DifferentialScanning Calorimetry.Surface charge and particle size of microspheres were also studied in order to predict their potential applications. Kinetics of swelling for SIPN was investigated in the aqueous solution of different pH.Prepared SIPN were used as micro-particulate devices for adsorptive removal of Bismark Brown-Yellow dye at 5 ppm concentration from water upto 96.92 % by 7 g/L dose. Adsorption followed pseudo second order kinetics and Freundlich isotherm model more closely. Thermodynamic data revealed spontaneity (ΔG˚= -1.9,3.5, & 4.0 KJ/mol)and endothermic nature (ΔH⁰ = 29.22 KJ/mol) of adsorption at studied temperatures with positive entropy (ΔS⁰ =103.53 J/mol).