Removal of nickel (II) ions from water by Jordan natural zeolite as sorbent material

Abstract

In various laboratory conditions Ni2+ was investigated and isolated in tone from aquatic solutions using Jordanian natural zeolite (JNZ). The used JNZ was obtained from central Jordan. The used size fraction is (1.0–0.3 mm) which can be used as ion exchanger bed. The effects of time of interaction, initial metal concentration, adsorbent dose concentration and temperature were examined in the removal experiments. The maximum sorption capacity is accomplished at pH 4. The removal rate of Ni(II) was calculated to be for zeolite sample of 0.02 g and 20 mg.L-1 as a preliminary Ni concentration with 4 hrs of contact time. The adsorption efficiency was observed in 153.846 mg.g−1. The JNZ adsorbent's equilibrium adsorption potential was calculated and extrapolated using the Langmuir and Freundlich isotherm models. The results show that the experimental results were better matched using Langmuir model. The adsorption behavior of JNZ for the removal of Ni2+ was well-described using the pseudo-second-order kinetic model. In this research, many thermodynamic properties were determined, such as entropy (ΔS), enthalpy (ΔH) and free energy (ΔG). Intraparticle diffusion analysis was also conducted.

Keywords

• Adsorption
• Natural zeolite
• Equilibrium
• pH
• Batch