Abstract
The purpose of this study was to obtain adsorbent zeolite modified by CaCO3 from pokea shell (PS) waste to adsorb Ni2+ ions. Adsorbents are made through the intercalation method, where the PS powder is mixed to zeolites in 0.1 M HCl with 3 ratios of 3:1, 2:2 and 1:3 (g/g), respectively. The optimization of adsorption power was carried out by using parameters such as pH, contact time and concentration variation of Ni2+ ion solution. The analysis of the adsorption capacity and type of bond using the Freundlich and Langmuir isotherm equations. The characterization of the active site composition of the adsorbent was used FTIR instrument. FTIR spectra showed that CaCO3 modified zeolite adsorbent include Si-OH, O-H, Al-O, Si-O, C-H, Ca-C and C-O from CaCO3 and C-O from CO3 2-functional groups. The results showed that the best adsorbent was it with the zeolite-PS powder ratio of 3:1, the optimum conditions were obtained at pH 5, contact time at 60 minutes and 45 mg l−1 concentration. Adsorption of Ni2+ ions meets the Freundlich isothermal with adsorption capacity and energy of 1.33 mg g−1 and 5.78 kJ mol−1.
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