Efficient removal of Ni(II) ions from aqueous solutions using analcime modified with dimethylglyoxime composite

Abstract

In this work, the analcime/dimethylglyoxime composite was facilely fabricated as a novel adsorbent for the removal of Ni(II) ions from aqueous solutions. The fabricated adsorbent was characterized utilizing FT-IR, XRD, FE-SEM, and CHN analyses. Wide XRD peak and cotton-like structure FE-SEM image of the adsorbent confirmed that the crystal assembly of analcime combined or interfered over amorphous surroundings. The best analytical conditions for the uptake of Ni(II) ions are accomplished at time = 120 min, pH = 6.5, and temperature = 298 Kelvin. Removal of Ni(II) ions was well modeled by pseudo-second-order as a kinetic model and Langmuir as an equilibrium isotherm. The negative sign of ΔGo and ΔHo indicates a spontaneous and exothermic process. The value of ΔHo, which is more than 40 kJ/mole, indicates the chemical nature of the adsorption process. The maximum uptake capacity of the synthesized composite is 144.9 mg/g. 0.5 M EDTA disodium salt can recover the adsorbed Ni(II) ions for three adsorption/desorption cycles. Diverse ions such as Cd(II), Cu(II), Pb(II), and Zn(II) did not interfere during the extraction of Ni(II) ions.

Keywords

• Adsorption
• Analcime/dimethylglyoxime composite
• Nanoparticles
• Ni(II) ions
• Selectivity