Faculty of Chemical Engineering, Malek Ashtar University of Technology, P.O. Box 16765-3454 Tehran, I.R. IRAN
Adsorption of cations Al, Zn, Fe, Cr and Pb from aqueous solution of hydrogen peroxide using IR-120 cation-exchange resin was studied. The removal percentage of the cations was examined by varying experimental conditions (such as pH of the hydrogen peroxide solution, temperature, contact time and dosage of adsorbent) in a stirred-batch system. Under the optimal conditions (pH=1, T=25oC, contact time=150 min, adsorbent dosage=5g), it was found that more than 98% removal was achieved. The cations adsorption was studied on the basis of Langmuir, Freundlich and linear isotherms in the concentration range of 0-50 mg/L. Adsorption of the cations on the resin followed first-order, pseudo-first-order (Lagergren) and intraparticle diffusion kinetic models in the cations range of 10-20 mg/L. The best fitted model for kinetic model was obtained as Lagergren model. The obtained studies showed that IR-120 cation-exchange resin was successfully used as an efficient adsorbent for removal of the cations from aqueous solution of hydrogen peroxide.