Studies on kinetics and mechanism of chelating reaction between chitosan, chitosan membrane with Pb(II) ion template and Pb(II)

Chitosan and chitosan membranes with Pb(II) ion as template were studied. The adsorption isotherms were correlated by dc/dt=-kc(n) at the temperature of 30 degreesC, 35 degreesC, 40 C, 45 T, 50 T. By means of linear correlation, the shapes of the isotherm curves were similar to the kinetic function of 2/rootc = -kt and the apparent activation energy for with chitosan (123.8 kJ (.) moL(-1)) was larger than that of membrane with Pb(II) ion (92.3 kJ (.) moL(-1)). The chitosan membrane with Pb(II) ion template was better "memory" function. The adsorption mechanism of chitosan with Pb(II) was studied by IR and XPS. The results indicated that the nitrogen in -NH2 and the oxygen in C-3-OH of chitosan were coordination atoms.