Palladium(II) complexes adsorption from the chloride solutions with macrocomponent addition using strongly basic anion exchange resins, type 1

The use of the strongly basic anion exchange resins. type 1 such as Lewatit MP-500 and Lewatit MP-500A for palladium(II) complexes adsorption has been investigated. The adsorption process was carried out from the chloride solutions with macrocomponent (sodium chloride) addition (x M HCl-1.0 M NaCl: x M HCl-2.0 M NaCl) where the concentration of hydrochloric acid was constant and equal to x = 0: 0.1: 0.5; 1.0; and 2.0 M. respectively. The breakthrough curves of Pd(II) were determined and the sorption parameters (weight and bed distribution coefficients, working anion exchange capacity) were calculated. The pseudo-second kinetic order was applied in kinetic studies as well as to calculate the kinetic parameters. The values of the working anion exchange capacities (0.029 g/cm(3); 0.028 g/cm(3)) for Lewatit MP-500 and Lewatit MP-500A (0.028 g/cm3; 0.027 g/cm(3)) in the 1.0 M NaCl and 0.1 M HCl-1.0 M NaCl solutions, respectively are really close and in other solutions under discussion Lewatit MP-500 possess slightly higher values of capacities, and therefore is insignificantly more efficient in the adsorption process of palladium(II) ions than Lewatit MP-500A. The equilibrium adsorption capacities changed in the range 8.84-9.99 and 8.40-9.38 mg/g for Lewatit MP-500 as well as 8.12-9.57 and 7.26-8.85 mg/g for Lewatit MP-500A in the chloride x M HCl-1.0 M NaCl and x M HCl-2.0 M NaCl solutions. respectively. The adsorption process proceeds according to the pseudo-second kinetic order. (C) 2009 Elsevier B.V. All rights reserved.