Adsorptive removal of copper and nickel ions from water using chitosan coated PVC beads.
A new biosorbent was developed by coating chitosan, a naturally and\nabundantly available biopolymer, on to polyvinyl chloride (PVC) beads.\nThe biosorbent was characterized by FTIR spectra, porosity and surface\narea analyses. Equilibrium and column flow adsorption characteristics\nof copper(II) and nickel(II) ions on the biosorbent were studied.\nThe effect of pH, agitation time, concentration of adsorbate and\namount of adsorbent on the extent of adsorption was investigated.\nThe experimental data were fitted to Langmuir and Freundlich adsorption\nisotherms. The data were analyzed on the basis of Lagergren pseudo\nfirst order, pseudo-second order and Weber-Morris intraparticle diffusion\nmodels. The maximum monolayer adsorption capacity of chitosan coated\nPVC sorbent as obtained from Langmuir adsorption isotherm was found\nto be 87.9 mg g(-1) for Cu(II) and 120.5 mg g(-1) for Ni(II) ions,\nrespectively. In addition, breakthrough curves were obtained from\ncolumn flow experiments. The experimental results demonstrated that\nchitosan coated PVC beads could be used for the removal of Cu(II)\nand Ni(II) ions from aqueous medium through adsorption.