Sorption Behavior of Grafted Porous Microparticles Based on Methacrylic Monomers and Chitosan/Gellan Gum towards Copper(II)and Nickel(II)Ions in Aqueous Solutions

摘要

The present work investigates the sorption properties of grafted porous microparticles based on glycidyl methacrylate and chitosan/gellan gum for Copper(II)and Nickel(II)ions from the aqueous solutions.Batch sorption studies regarding the effects of various parameters,such as the chemical structure of the microparticles networks,the initial concentration of metal solution,pH value and contact time,were performed.The grafted porous microparticles obtained by suspension polymerization technique and loaded with metal ions were characterized by Fourier-Transform Infrared Spectroscopy and Scanning Electron Microscopy with Energy Dispersive X-Ray Analysis.The maximum loading capacities were:41.70(mgg~(-1))Copper(II)/39.27(mgg~(-1))Nickel(II)for grafted microparticles with chitosan and 35.16(mgg~(-1))Copper(II)/31.48(mgg~(-1))Nickel(II)for those grafted with gellan,respectively.The equilibrium data were modeled by the Langmuir-Freundlich,Langmuir and Dubinin-Radushkevich isotherm models.The Lagergren,Ho,Elovich and Weber-Morris particle diffusion models were applied to study the sorption kinetic mechanism.To highlight the efficiencies of the grafted porous microparticles as sorbents,four sorption/desorption cycles were performed.The results indicated that the grafted microparticles based on glycidyl methacrylate and chitosan/gellan gum could be used as sorbents for the removal of Copper(II)/Nickel(II)ions from aqueous solutions.