Sajjad Lotfi - Faculty of Physics, University of Tabriz, Tabriz, Iran
Bagher Aslibeiki - Faculty of Physics, University of Tabriz, Tabriz, Iran
Mahmoud Zarei - Department of Applied Chemistry, University of Tabriz, Tabriz, Iran

Tri-ethylene glycol (TEG) coated Fe۳O۴ nanoparticles ferrofluid were used for Pb (II) removal from simulated wastewater. The samples were synthesized using a modified co-precipitation method. The prepared samples were characterized by different techniques including X-ray diffraction, Rietveld method, FTIR, FESEM, TEM, VSM, TGA, BET and atomic adsorption experiments. The crystallinity of nanoparticles with a cubic spinel ferrite structure and absence of impurity phases were verified using X-ray diffraction and Rietveld method. The presence of TEG was approved by FTIR and thermogravimetric analysis. The VSM results showed that the bonding between the TEG molecules and ferrite nanoparticles, reduces the surface spin disorder, influences the morphology and magnetization, and consequently increases the Pb (II) removal efficiency to a high value of ۹۷%. The obtained high value of adsorption capacity of q=۳۶۳.۴ mg.g-۱ with R= ۹۱ % and q=۱۲۹.۴ mg.g-۱ with R=۹۷ %shows effective role of TEG coating on Pb (II) adsorption. The interesting results of this study imply that the TEG coated ferrofluid sample is suitable candidate for practical applications.

TEG-Fe۳O۴, Coating, Magnetization, Pb(II), Adsorption