Abstract

Ahmad Zakaria¹, Witri Djasmasari², Henny Rochaeni³, Yustinus Purwamargapratala⁴ and Supriyono*³

DOI : http://dx.doi.org/10.13005/ojc/350227

Study of kinetics and thermodynamic of Cu(II) ion adsorption onto synthetic zeolite made of coal fly ash have been investigated. The aim of this research was to define  the kinetics model  and thermodynamic parameters such as Gibbs free energy (DG°), entropy (DS°), and enthalpy (DH°) of  adsorption  process of Cu(II) ion by synthetic zeolite made of coal fly ash. The effect of the presence of coexisting ion to the efficiency of Cu(II)adsorption had also been investigated. The experimental conditions were 5, 15, 30, 45, 60, 75, 90 minutes for the contact times and 27, 32, 37, 42°C for the temperature.  The kinetics data were evaluated using a first-order and a pseudo second-order Lagergren equation. The results revealed that the kinetics data had good correlation with the pseudo second-order kinetics model. Thermodynamic studies indicated that the adsorption process was spontaneous with the increase in entropy and decrease in Gibbs energy. The coexisting Pb(II) or Mn(II) ions decreased the Cu(II) ion adsorption onto synthetic zeolite, but increased the total adsorption capacities.

Coal Fly Ash; Co-Ions; Gibbs Free Energy; Kinetics Model; Synthetic Zeolite

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