Adsorption of Copper Ions by Sodium Lignosulfonate-chitosan Polyelectrolyte Complex

According to the theory of static action,sodium lignosulfonate-chitosan(SLS-CS) polyelectrolyte complex was prepared from alkaline lignin and chitosan.The structure of sodium lignosulfonate-chitosan(SLS-CS) polyelectrolyte was characterized by Fourier transform infrared(FT-IR) and X-ray powder diffraction(XRD).The adsorption property for copperions by sodium lignosulfonate-chitosan polyelectrolyte was also evaluated.The results indicated that NH+3 was formed by the protonated amino groups of chitosan which formed sodium lignosulfonate-chitosan(SLS-CS) polyelectrolyte complex by reacting with —SO3Na of sodium lignosulfonate through electrostatic adsorption.Compared with the sodium lignosulfonate and chitosan,the amorphous peak of chifosan tends to decrease,the arrangement of sodium lignosulfonate-chitosan(SLS-CS) polymer appears more ordered,intermolecular force is enhanced,the adsorption equilibrium time for copper ions is about 5 h,and the saturated adsorption capacity is 12.5 mg/g.The adsorption isotherm curve fits well with Freundich equation.