PREPARATION OF NANOSORBENTS FOR CHROMATOGRAPHY BY SOL-GEL TECHNOLOGY BASED ON TETRAETOXISILANE AND METAL OXIDES

Background. The success of any chromatographic methods and the expansion of their field of application is determined by the choice of sorbents used and their specific interaction. In this regard, preparation of mesoporous nano-size sorbents based on local raw materials is one of the urgent problems. Purpose. Preparation of mesoporous nanosorbents for chromatography based on SiO2, TiO2, Al2O3 and investigation of their phase composition, textural and physicochemical characteristics. Methodology. Investigation of the phase composition by diffractometry and the textural characteristics of the samples by scanning electron microscopy. Originality. The samples of mesoporous nanosorbents were synthesized using the “sol-gel” technology from metal oxides and tetroethoxysilane as a source of SiO2. It is proved that the obtained sorbents on phase composition, textural, physicochemical characteristics correspond to mesoporous nanosorbents. Findings. Based on the “sol-gel” technology, the mesoporous nanosorbents have been synthesized using tetraethoxysilane, metal oxides and surfactant from polyethylenglycol. The rate constant - k and the activation energy-ΔEa of gel formation were determined by the method of their linear time transformation. The activation energy of the reaction is determined by plotting the curve of dependence of the gel formation time on the inverse temperature lnt0-1=f(1/T). Highlights: - specific volume and average diameter of the pores of nanosorbent; - diameter of mesopores of nanosorbent samples is revealed.