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Formation of Photocatalytic Nano-Centers on the Surface of the Photocatalytic Sorbing Agent

Using the effect of photocatalytic oxidation in nanocrystalline structures is one of the most promising methods of purifying air and water contaminated with organic pollutants. Zinc oxides and titanium oxides are widely used as photocatalysts. The majority of works on the synthesis of photocatalysts on the basis of titanium oxides are covering the elaboration of technological processes of production nanocrystalline oxides either in free condition or as a film on inert carriers or as dispersed oxides. The possibility of obtaining and using photocalalysts on cation centre level in nanostructured chemically active carrier material has not been studied before. It is practical to use calcium silicate and calcium aluminosilicate based granulated composite sorbing agent as an active carrier material. A distinctive feature of composite sorbing agent is its ability of irreversible sorption of heavy metals cations due to formation of substitutional solid solution with a wide homogeneity region. Methods of obtaining photocatalytic centres on the surface of composite sorbing agent have been formulated. Samples of photocatalytic sorbing agent have been obtained by sorption of Ti3+ cations from sorbate solution and through surface exchange reactions. The regularities of formation of nanostructured photocatalytic surface centres of γ 2CaO•SiO2-Ti2O3 type and 2CaO•Al2O3•SiO2-Ti2O3 type on the surface of composite sorbing agent have been studied. Photocatalytic sorbing agent has been proven effective in photocatalytic decomposition of methyl red.