Cadmium sorption on chitosan sorbents : kinetic and equilibrium studies

摘要: Chitosan is very efficient at removing cadmium through chelation mechanisms involving amine groups of chitosan. The optimum pH 7, and in acidic solutions, the protonation biopolymer reduces binding on due to electrostatic repulsion. influence particle size, temperature agitation speed metal sorption investigated using chitosan flakes gel beads. Temperature hardly equilibria kinetics selected experimental conditions corresponding a large sorbent dosage. major effect performance especially for flakes. Though intraparticle diffusion represents an important step kinetic control, contribution external may not be neglected.