SYNTHESIS OF BIOGENIC COMPOSITES BASED ON ENDEMIC RAW MATERIALS OF THE REPUBLIC OF KAZAKHSTAN AND THEIR APPLICATION FOR CATALYTIC REMOVAL OF CHROMIUM IONS

Abstract

The rapid development of nanotechnology and the intensive use of nanoscale materials in biological and medical applications is the driving factor in the development of new and improvement of existing methods and technologies for the synthesis of nanomaterials. Special attention from researchers is attracted to the green chemistry methods based on the use of highly efficient, inexpensive and non-toxic biological resources for the synthesis of metal nanoparticles and their oxides. Unlike traditional methods of synthesis, green chemistry approaches are not only environmentally friendly but also make it possible to obtain nanoparticles without trace impurities used in the synthesis of precursors and reducing agents. In this work, using endemic plant materials, biogenic composites were synthesized based on silver nanoparticles and vegetative organs of silver birch (inner bark and tinder fungus (birch chaga)) used as biogenic support for the immobilization of nanoparticles. The structure and composition of the samples were comprehensively characterized. The effect of nanoparticles' loading time on the catalytic activity of resulting composites was studied in the model reaction of decomposition of chromium (VI) ions under visible light. The kinetic parameters of the reaction have been studied.