Preparation of CoFe2O4/SiO2 magnetic nanoparticles as adsorbent of Ni and Cu ions from aqueous solution

• Main Authors: Asri, Nining Sumawati, Suharyadi, Edi
• Format: Conference Proceeding
• Language: English
• Subjects: Adsorbents; Adsorption; Aqueous solutions; Bending vibration; Chemical precipitation; Coating; Cobalt ferrites; Copper; Heavy metals; Iron oxides; Magnetic materials; Magnetic properties; Magnetic saturation; Morphology; Nanoparticles; Nickel; Silicon dioxide; Surface chemistry; Wastewater; Wavelengths
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0014851

CoFe2O4/SiO2 magnetic nanoparticles have been prepared by co-precipitation methods. The structure, morphology and magnetic properties were analyzed using various characterization such as XRD, FTIR, TEM, and VSM respectively. The surface was modified using silica in order to create new active sites as a potential adsorbent to remove Ni and Cu ions from wastewater. The result obtained that the crystal size of CoFe2O4/SiO2 increased compared to uncoated magnetic nanoparticles. The size of crystal before and after coated using silica was found about 8 nm and 11 nm, respectively. The FTIR results suggested that stretching vibration of Fe/Co-O occurs at a wavenumber of 470.63 cm−1 and 399.47 cm-1, and wavenumber of 1033.85cm-1 indicate bending vibration of Si-O-H. It confirmed that SiO2 was successfully coated the nanoparticles. The magnetic properties of coated material were found decreased after the silica addition is about 22.34 emu/g, while the magnetic saturation (Ms) of uncoated cobalt ferrite is about 37.56 emu/g. The decrease of the value is due to the presence of silica properties as non-magnetic materials and the presence of impurity (α-Fe3O4) on the core material. In the adsorption process, the other factors were also observed (e.g. the effect of particles size and magnetic properties). The adsorption capacity of silica-coated CoFe2O4 reaches about 77.48 mg/g and 74.46 mg/g for Ni and Cu ions, respectively. The smallest particles size has a wide surface area and the highest magnetic saturation gives the greatest influence on the adsorption capacity of Ni and Cu ions. The results confirm that the silica-coated CoFe2O4 magnetic nanoparticles could be a potential adsorbent for the effective removal of heavy metals from aqueous solutions.