Abstract:
The great interest in nanostructured magnetic composites is due to their great prospects
for use as a basis for the development of catalysts for the adsorption of manganese in wastewater.
Interest in magnetic nanocomposites in this direction is primarily due to the possibility of extracting
them from water media using ordinary magnets, which allows them to be used again. Additionally, it
is worthwhile to note interest in research related to increasing the efficiency of adsorption, as well as
an increase in the number of repeated cycles of operation. In this regard, the main goal of this study
is to study the prospects for applying the method of mechanochemical synthesis for the creation of
iron-containing nanocomposites doped by rare-earth elements Gd, Ce, Y, and Nd in order to obtain
optimal catalysts for cleaning water media. During the studies, structural properties and phase
composition of synthesized nanocomposites were established, as well as ultra-thin parameters of
the magnetic field. It has been established that the kinetic curves of the adsorption process can be
described by a pseudo-first-order model, and the process of manganese adsorption itself is associated
with the cationic interaction of manganese ions with the surface of nanocomposites. The kinetic
curves of degradation were determined, as well as the influence of the number of cyclic tests on
the adsorption of manganese for synthesized nanocomposites, depending on the type of dopant
and phase composition, respectively. Iron-containing nanocomposites doped with gadolinium and
neodymium have been found to have the highest adsorption efficiency and corrosion resistance.
Particular attention is paid to the study of the stability of storage of nanocomposites for a long time,
as well as the preservation of their adsorbent properties in the purification of aqueous media. It
has been determined that the modification of nanostructures with the help of rare earth compounds
leads to an increase in resistance to degradation, as well as to the preservation of the efficiency
of adsorption for 5–7 cycles in comparison with Fe2O3 nanoparticles, for which low resistance to
degradation was observed.
