Synthesis of nano-CaO particles and its application for the removal of copper (II), Lead (II), cadmium (II) and iron (III) from aqueous solutions

CALCIUM oxide (CaO) nanoparticles were synthesized by the sol-gel method from CaCl₂ and calcinated the collected powder at different tempratures (400, 500 and 600°C). Moreover, the structural characteristics for the prepared sorbent were investigated by means of powder X-ray diffraction analysis (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM) while the textural properties were determined from low temperature adsorption of N₂ at-196 °C. Good results were obtained under the appropriate conditions. The ability of CaO nanoparticles for removal of some heavy metal ions as Fe(III), Pb(II), Cu(II) and Cd(II) from aqueous solutions through adsorption has been investigated. All the experiments were carried out by batch method. The effect of stirring time, pH (2, 5, 7, 8 and 10), adsorbent dose (5-40 mg/100 ml), temperature and the presence of different foreign ions has been investigated. The percentage of removal to about 100 % of different metal ions at pH7, room temperature (≈ 25°C) was achieved, stirring time 30 min and adsorbent dose 30 mg.