STUDY OF THE EFFICIENCY OF WATER PURIFICATION FROM HEAVY METAL IONS WITH MAGNETITE SORBENTS
The process of water treatment from heavy metal ions on sorbents with magnetic properties was investigated. Samples of magnetite obtained at a ratio of the concentrations of iron (II) ions and iron (III) 1 : 2; 1 : 1 and 2 : 1, and samples modified with sodium sulfide were used. The effect of pH on the sorption efficiency of heavy metal ions on magnetite was studied. It was shown that the sorption capacity of magnetite towards heavy metal ions, as well as the efficiency of water treatment from these compounds, increases with an increase of the [Fe2+]/[Fe3+] ratio from 1 : 2 to 2 : 1. Sorption capacity of magnetite increases with increasing pH due to partial hydrolysis of heavy metal ions. Also sorption capacity of magnetite increases significantly if modified it with guanidine, thiosemicarbazide, and sodium sulfide. At the same time, the sorbent provides a high degree of water purification from heavy metal ions while reducing the metal concentrations to several µg/dm3. Ref. 12, Fig. 5, Tab. 1.
Duruibe J., M.O.C. Ogwuegbu, Egwurugwu J.N. Heavy metal pollution and human biotoxic effects. International Journal of Physical Sciences. 2007. 2 (5). pp. 112–118.
Mirbagheri S.A., Hosseini S.N. Pilot plant investigation on petrochemical wastewater treatment for the removal of copper and chromium with theobjective of reuse. Desalination. 2005. Vol. 171. pp. 85–93.
Mohsen-Nia M., Montazeri P., Modarress H. Removal of Cu2+ and Ni2+ from wastewater with a chelating agent and reverse osmosis processes. Desalination. 2007. Vol. 217. pp. 276–281.
Zhang L.N., Wu Y.J., Qu X.Y., Li Z.S., Ni J.R. Mechanism of combination membrane and electro-winning process on treatment and remediation of Cu2+polluted water body. J. Environ. Sci. 2009. Vol. 21. pp. 764–769.
Heidmann I., Calmano W. Removal of Zn (II), Cu (II), Ni (II), Ag (I) and Cr (VI) present in aqueous solutions by aluminium electrocoagulation. J. Hazard. Mater. 2008. Vol.152. Р. 934–941.
Cifuentes L., Garcнa I., Arriagada P., Casas J.M. The use of electrodialysis for metal separation and water recovery from CuSO4-H2SO4-Fe solutions. Sep. Purif. Technol. 2009. Vol. 68. pp. 105–108.
Kang S.Y., Lee J.U., Moon S.H., Kim K.W. Competitive adsorption characteristics of Co2+, Ni2+, and Cr3+ by IRN-77 cation exchange resin in synthesized wastewater. Chemosphere. 2004. Vol. 56. pp. 141–147.
Alyz B., Veli S. Kinetics and equilibrium studies for the removal of nickel and zinc from aqueous solutions by ion exchange resins. J. Hazard. Mater. 2009. Vol. 167. pp. 482–488.
Bilyavsky S.О., Sarahman R.B., Halysh V.V., Trus I.M. [Optimization of technology for obtaining sorbents from vegetable waste], Ecologichni nauki [Ecological Sciences]. 2018. Vol. 21. pp. 212–217. (Ukr.)
Goncharuk V.V. Radovenchik V.M., Gomelya M.D. [Dismantled and victorious of highly dispersed sorbents in magnetic properties]. Kiev : Grafika, 2003. 263 р. (Ukr.)
Bozhenko O.M., Omelchuk Yu.A., Gomelya M.D. [Otrimannya high-selective sorbents for viluchennya mіdі іz water systems cooling AES]. Zbіrnik naukovyh prats Sevastopilskogo Nationalnogo Uni- versitetu Yadernoi Energetyky ta Promyslovosti. 2009. Iss. 4. рр. 148–154. (Ukr.)
Surovtsev I.V. et al. [The determination of heavy metals in aquatic ecosystems by the method of inverse chronopotentiometry]. Chemistry and Water Technology. 2009. 31 (6). pp. 677–687. (Rus.)