Fabrication of coatings based on strontium-bismuth-silicate photocatalyst for water purification from organic pollutants

Abstract

Strontium-bismuth containing photocatalytic active coatings on a silicate carrier using sorbite-nitrate pyrolytic synthesis were obtained. The effect of strontium-bismuth molar ratio in the precursor mixture on the phase composition, boundaries of the visible light absorption region and photocatalytic activity of the coatings obtained were studied. The best photocatalytic activity is achieved by coatings obtained from the precursor mixture at Sr:Bi molar ratio of (1:3) and (1:4) in the experiment with a model organic pollutant — methylene blue (MB). The obtained photocatalytically active coatings on silicate carrier (Sr:Bi-1:4) were tested in a water purification unit (WPU) at different rotation speeds. The effective range of rotation of samples without loss of photocatalytic properties at photo-oxidation of MB (15–35 rpm) was established.