Получение мезопористых материалов на основе диоксида титана, модифицированного частицами магнетита, обладающих высокой адсорбционной емкостью и фотокаталической активностью

Abstract

Crystalline composite structures based on titanium dioxide modified by magnetite particles with improved sorption and photocatalytic properties were obtained by a microwave-assisted method. This method is based on a polyol method synthesis of titanium glycolate using microwave heating and followed by the water treatment under microwave heating at 2.45 GHz, without using the calcination stage at high temperatures. It was found that the treatment of titanium glycolates in water under the influence of microwave heating leads to the formation of the crystal structure of titanium dioxide (polymorphic anatase modification). Using scanning electron microscopy, it was shown that during the synthesis of composite structures based on titanium dioxide, the formation of particles of a spherical and rod-shaped form. The resulting materials were characterized by electron microscopy, X-ray phase analysis, dynamic light scattering, and low-temperature nitrogen adsorption/desorption. The analysis of the influence of structural and morphological features on the adsorption capacity and photocatalytic activity of the composites is carried out. A comparative analysis of the photocatalytic activity of the obtained composites in the decomposition of the Rhodamine B dye under UV radiation showed that the most effective dye removal (~ 99 %) were observed in the presence of both spherical and rod-shaped composite structures as catalysts containing 1 % of magnetite.