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Bismuth oxide (Bi2O3), an n-type semiconductor has been satisfactorily investigated for photocatalytic organic contaminant remediation. The Bi2O3 was prepared by solution combustion synthesis (SCS) using as the oxidizing bismuth nitrate in acidic medium and urea as fuel. The influence of the type of synthesis on the photocatalytic properties of the oxide formed was investigated by XRD. From the diffractograms was verified that the materials obtained are predominantly of Bi2O3 crystals, it is possible to identify a sample with two crystalline phases, monoclinic (α-Bi2O3) and tetragonal (β-Bi2O3), and the other with only the monoclinic (α-Bi2O3). The two-phase oxide showed higher photocatalytic activity for discoloration of methylene blue under UV irradiation (60.59%) and under sunlight (61.64%) in 664 nm, followed kinetic law of pseudo-first order

Fotocatálise do azul de metileno na presença de óxido de bismuto sob irradiação de luz UV e solar