Optimization and Adsorption Behavior of Nanostructured NiFe2O4/Poly AMPS Grafted Biopolymer

Abstract

By grafting polysaccharides backbone of biopolymer (alginate) on synthetic polymer nanocomposite chains (PAMPS/NiFe2O4) to remove methylene blue and toxic heavy metal (Cu2+) from aqueous solutions, a superadsorbent was prepared. Using FTIR, TGA, X-ray diffraction, TEM, and SEM studied the structures of native and grafted alginate hydrogels. Adsorption experiments have been optimized using RSM/CCD response surface methodology and analyzed as a pH solution and adsorbent dose function. The initial concentrations of metal and dye, temperature, and contact time were also discussed and isothermal, thermodynamic adsorption, and kinetic theoretical constants were calculated as well. Results revealed that alginate grafted nanocomposite PAMPS/NiFe2O4 enhanced the proportion of methylene blue (MB) color removal up to (98.32%) and metal ion discharge (83%). The optimum cationic dye MB and Cu2+ ions adsorption capability were acquired at pH (5.75 and 4) and temperature (318.15 K) respectively. For both MB dye and Cu2+ ions, the pseudo-2nd-order model has effectively defined the adsorption kinetics and the Freundlich model could precisely explain adsorption isotherms than the Cu2+ Langmuir adsorption model, while the adsorption of MB dye showed a greater presence for both Freundlich and Langmuir designs. MB dye and Cu2+ ions have recorded the highest adsorption capacity of 275.6 and 22.81 mg/g respectively; indicating an efficient separation of adsorbent from aqueous solutions for both cationic dyes and toxic heavy metals.