An improved synthesis of chitosan bead for Pb(II) adsorption

In this study, an improved synthesis method of preparation of Pb(II) imprinted chitosan (Pb(II)-CS) bead with uniform size and porous morphology was proposed to combine the microfluidic technique with crosslinking solidification. The infrared spectrum indicated the reversible chelation of Pb(II) with amino group played important role in amino group protection and Pb(II) adsorption. The adsorption capacity of Pb(II)-CS bead reached 79.2 mg/g for Pb(II) by optimizing preparation conditions and the desired adsorption time was just less than 30 min. The adsorption performance of Pb(II) on Pb(II)-CS matched with the pseudo-second-order kinetic model and the Langmuir isotherm model well. The recycled use of the Pb(II)-CS bead demonstrated little change in the adsorption capacity. The Pb(II)-CS bead might be used as an effective adsorbent for Pb(II) removal from water.