Abstract
In the present study, the influence of the crystalline structure of Fe2O3(amorphous) @TiO2, α-Fe2O3@TiO2 and α-Fe2O3 @SiO2 @TiO2 nanocomposites on the NIR-reflectance and photocatalytic properties have been investigated. The nano-sized α-Fe2O3, SiO2 and TiO2 were prepared via co-precipitation, Stober and sol-gel methods, respectively. The photocatalytic performance of the nanoparticles was examined by the photodegradation of Acid Red18 under UV irradiation after 120 min of reaction. NIR-diffuse reflectance and colorimetric parameters were measured. The results showed that the TiO2 coating has considerably enhanced the photocatalytic activity and the NIR-reflectance. Fe2O3 (amorphous)@TiO2 nanocomposite possesses the highest NIR- reflection and α-Fe2O3 @TiO2 reveals the maximum photocatalytic degradation. Silica coating in the α-Fe2O3@SiO2@TiO2 nanocomposite has been boosted both of the NIR-reflectance and photocatalytic degradation to their maximum level. As a result, this multipurpose composite is suitable to be simultaneously developed for both photocatalytic and cool pigment applications.
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