Study of the Biological Activity of Nanocomposites Based on Goethite and Humic Substances

Biological activity is one of the most important properties of nanocomposites. Nanocomposites based on hectorite and humic substances are iron-containing nanocomposites combined with organic macromolecules, exhibiting numerous properties and high structural complexity, which can be applied in biomedicine as diagnostic and therapeutic tools. Therefore, studying the bioactivity of nanocomposites based on hectorite and humic substances is a relevant research direction. To investigate the biological activity of nanocomposites based on hectorite and humic substances. Materials and methods: mechanisms of formation of hectorite nanocomposites with organic substances were determined. Interactions between water-soluble humic acids (HA) and Fe(oxy)hydroxides (α-FeOOH, α-Fe₂O₃, polymerized amorphous iron phases) were studied. The mechanisms of formation of hectorite nanocomposites with organic substances were identified. Conclusions: iron oxides strongly interact with the negative surface charge of humic acids. Nanohybrid composites of hectorite (α-FeOOH) with carbon-containing organic substances (activated carbon, humic acids) have been obtained. The toxicity of these synthesized ironcontaining preparations was determined, and their biological activity was investigated.