| Abstract [eng] |
The main objective of environmental protection is to reduce heavy metal pollution and to find efficient sorbents for. Regenerated, mechanically stable and environmentally friendly magnetic nanosorbents used to remoce heavy metals are more promising than macro- or micro- materials. After analyzing their sorptive and regenerative properties, establishing favorable sorption conditions, sorbents can be applied not only in water treatment technologies, protecting the environment from toxic elements, but also concentrating metals from various aqueous media. This dissertation estimates the application of magnetic nanosorbents (magnetite, magnetic graphene oxide, magnetic Prussian blue and magnetic Prussian blue with graphene oxide) to remove heavy metals from liquid media. The dissertation consists of the literature review and three research chapters. The first section of the research results is intended for the characterization of synthetic nanosorbents by Mössbauer, XRD, FTIR, RAMAN, SEM, and TEM methods. Also, their magnetic properties are determined. In the second chapter, studies of the dependence on the sorption efficiency of heavy metals (Cu (II), Co (II), Ni (II) and Pb (II) are shown. Results show effect of initial metal ion concentration, time and sorbent dosage on sorption effieciency, as well as competitive sorption and regeneration studies. Isotherm (Langmuir, Freudlich, Dubinin-Radushkevish) and kinetics (pseudo-first, pseudo-second-particle diffusion) models are used for data analysis. The third chapter examines correlation of data with the statistical model. The dispersion analysis (ANOVA) was used to determine influence of three variables on sorption efficiency. The correspondence between experimental and theoretical data is presented. |
