Synthesis and photocatalytic property mesoporous tantalum oxynitride
Inluence of conditions of an ammonolysis of the mesoporous magnesium redaction tantalum powders with the speciic surface area 56 - 63 m<sup>2</sup>·g<sup>-1</sup> in the range of temperatures 400 - 900 °С on the phase composition and a speciic surface area of the received products was investigated. It is shown, that at the temperature 400 - 600 °С ammonolysis products uncrystalline. When the rate of temperature change is 20 K/min the nitrogen content in these products is from 5.4 to 7.3 %, speciic surface area 42 - 35 m<sup>2</sup>∙g<sup>-1</sup>, at the rate of temperature change 8 K/min one is 2.4 - 5.4 % and 56 - 49 m<sup>2</sup>∙g<sup>-1</sup> respectively. The crystal phase of tantalum oxynitride TaON is formed at a temperature of 700 °C and above. The received materials show high photocatalytic activity at the reactions of degradation of ferroin and methylene blue at radiation by visible light (λ ≥ 420 nanometers).