Competitive adsorption of Cu2+ and Zn2+ ions from aqueous solutions by oxidized carbon nanotubes

The individual and competitive adsorption capacities of Cu2+ and Zn2+ by nitric acid treated multiwalled carbon nanotubes (CNTs) were studied. The maximum sorption capacities calculated to single ion adsorption were 100% for Cu2+ and 91.4% for Zn2+ in the initial concentration 5 mg/l. The competitive adsorption studies showed that the affinity order of two metal ions adsorbed by CNTs were 90.4% for Cu2+ and 52.68% for Zn2+in the initial concentration 5 mg/l. Equilibrium time were studied for of single ion adsorption and of two metal ions adsorption by CNT 0.02 g at initial concentration 5 mg/l, this time was 60 min. The effects of solution pH, initial concentration, CNT dosage and temperature on the competitive adsorption of Cu and Zn ions were investigated.

کلیدواژه ها:

carbon nanotube ، competitiv adsorption ، copper ، zinc