Photocatalytic Properties of TiO2/Fe2O3 and Research Applications in Coatings
In this paper,the precursors of TiO2 and Fe2O3 were synthesized by hydrothermal method and TiO2/Fe2O3 heterojunctions were prepared by high-temperature calcination,and a series of characterization of the formation of TiO2 and Fe2O3 was carried out by XRD,SEM,TEM,etc.The UV-diffuse reflectance spectroscopy showed that TiO2/Fe2O3 heterojunctions had significantly higher light-absorption properties than those of TiO2 and Fe2O3 in the visible light range redshift.The formation of TiO2/Fe2O3 heterojunction was theoretically calculated by Tauc curve and Mott-Schottky curve,and the heterojunction showed excellent photocatalytic activity in the visible light range with a catalytic rate of 94%for methyl orange for 180 min.The 24 h photocatalytic degradation efficiency of formaldehyde was 89.6%when the mass ratio of 1∶100 was added to the interior wall coatings,and the TiO2/Fe2O3 heterojunction formed under high temperature calcination was an excellent high-temperature-resistant filler,so that the application in fire-retardant coatings significantly enhanced their flame-retardant properties.When the added mass ratio in the fire-retardant coatings was 2.5∶100,the residual carbon of the fire-retardant coatings was enhanced from 35%to 39%,and the epoxy fire-retardant coatings of 9.0 mm were fire-resistant for 230 min,presenting good fireproofing performance,with strong adhesion,durability,and mechanical properties of the epoxy coatings;and the expanded carbon layer was of high strength and good densification.The presence of TiO2/Fe2O3 heterojunction gives the fire-retardant coatings good self-cleaning performance.
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