2013
Volume 13, Number 2, pp. 61–68
Sorption of Pb2+ by magnetite coated with humic acids
Anna A. Yurishcheva,1 Kamila A. Kydralieva,1, 2 Anar A. Zaripova,2 Gulzhian I. Dzhardimalieva,1, 3
Anatoly D. Pomogaylo1, 3 and Sharipa J. Jorobekova2
1 Moscow Aviation Institute, Volokolamskoe Sh. 4, Moscow, Russia
2 Institute of Chemistry and Chemical Technology, Bishkek, Kyrgyzstan
3 Institute of Problems of Chemical Physics, Moscow district, Chernogolovka, Russia
This study investigated the applicability of magnetite nanoparticles functionalized with humic acids (Fe3O4/HA) for the sorption of Pb2+. Magnetite nanoparticles of diameter ~15nm were synthesized using a coprecipitation method and characterized by X-ray diffraction and scanning electron microscopy, and Mössbauer and FTIR spectroscopies. Batch experiments were carried out for the removal of the lead ions from aqueous solutions by HA-coated magnetite nanoparticles. The effects of contact time, solution pH and salinity on the amount of Pb2+ removed were investigated. The adsorption process was found to be highly pH-dependent, which enabled the nanoparticles to selectively adsorb this metal from wastewater. The adsorption of Pb2+ rapidly reached equilibrium (within 15 min), and the adsorption data were well fitted with the Langmuir isotherm.
Keywords: humic acids, lead ions, magnetite nanoparticles, sorption