ПОШУК НОВИХ ЕКОНОМІЧНО ДОСТУПНИХ СОРБЕНТІВ ДЛЯ ЗАХИСТУ ВОДОЙМ ВІД ЗАБРУДНЕНЬ

Анотація

Pollution of water bodies in the world causes a growing need to find new, effective, selective, affordable
and environmentally friendly sorbents for the removal of pollutants. Analysis of existing research emphasizes
the importance of developing both highly effective and cheap, non-toxic and easily renewable sorbents.
Natural materials, such as lignocellulosic sorbents (e.g. sawdust) and mineral ones, are promising in this
regard. Among these natural materials, sawdust has its advantages as a waste of the woodworking industry,
which makes its use convenient and economically profitable. Natural raw materials do not always have the
desired sorption properties. However, they can be improved by modifying the surface with various functional
groups. Research and development of methods for purifying water bodies from heavy metals, such as copper,
are particularly important, since this metal can pollute natural water resources through industrial use and, as
a result, accumulate over time in the body. To date, the use of modified lignocellulosic sorbents, in particular
pine sawdust, for water purification from heavy metals has not been sufficiently studied. In this regard, in the
study, it was decided to study the sorption properties of pine sawdust modified with urea and ammonium
phosphate, since these reagents are able to generate functional groups with nitrogen and phosphorus, which
can retain d-metal ions, in particular copper. The process of modifying pine sawdust included the following
stages: sawdust samples were filled with solutions of ammonium phosphate and urea of appropriate
concentration, settled, dried in air, calcined in a drying oven, washed with hot distilled water to neutral pH
and dried to constant mass. The sorption properties of modified sawdust were studied by determining the
change in the concentration of a 2 mM copper (II) sulfate solution before and after sorption, and the
concentration of Cu2+ ions was determined by the back titration method. Before titration, the pH of the
solutions after sorption was also measured.