Methylene blue photocatalysis in the presence of bismuth oxide under UV and solar light irradiation
DOI:
https://doi.org/10.5433/1679-0375.2014v35n1p55Keywords:
Photocatalysis, Bi2O3, SemiconductorAbstract
Bismuth oxide (Bi2O3), an n-type semiconductor has been satisfactorily investigated for photocatalytic organic contaminant remediation. TheBi2O3 was prepared bysolution combustionsynthesis(SCS) using as the oxidizing bismuth nitratein acidic medium and urea asfuel. 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(?-Bi2O3) and tetragonal (?-Bi2O3), and the other with only the monoclinic (?-Bi2O3). The two-phase oxide showed higher photocatalytic activity for discolorationof methylene blue under UV irradiation (60.59%) and under sunlight (61.64%) in 664 nm, followed kinetic law of pseudo-first order.Downloads
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