Abstract
Orthorhombic phase BaFe2O4 powder was synthesized by using a solid state reaction method and investigated for its visible light photocatalytic properties. The crystallization of the structural phase was found to occur at a temperature above 1000 ◦C yielding a pure orthorhombic phase BaFe2O4 (SGB b21m) at 1100 ◦C. The estimated band gap, as determined by UV-Vis diffuse reflectance studies, was ∼1.9 eV (652 nm). A new material was designed and fabricated as Pt/RuO2/BaFe2O4 to enhance its photocatalytic activity. A very low (<1 wt% RuO2) co-catalyst doping over BaFe2O4 was important for achieving high photocatalytic efficiency. The newly designed system was investigated for photo-decomposition of isopropyl alcohol (IPA) and of water under visible light (≥420 nm). Its photocatalytic activity was significantly higher than that of platinized TiO2−xNx. A mechanism has been proposed to explain the photocatalytic behavior of the designed BaFe2O4 photocatalyst.
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