Adsorption of Cu~(2+) ions from Aqueous Solution by NaOH Activated ZSM-5 Zeolite

摘要

ZSM-5 zeolite was chemical activated by using NaOH solution to enhance the adsorption efficiency to Cu~(2+) in aqueous solution. The equilibrium isotherm of NaOH activated ZSM-5 zeolite showed that the Langmuir model gave a better fit to the experimental data. The maximum adsorption capacity of NaOH activated ZSM-5 zeolite was 40.49 mg/g. The adsorption capacity was increased nearly 3.3 times than unactivated zeolite by using 0.4M NaOH. The kinetics study showed that the pseudo-second-order kinetics model could be used to describe the adsorption process satisfactorily. The research also found that the coexisting of Pb~(2+) ion would greatly decrease the adsorption efficiency of activated zeolite from 99.35% decreased to 56.52%. Both ZSM-5 zeolite and NaOH activated ZSM-5 zeolite was characterized by SEM.