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Intensely yellow β -bismuth trioxide in the form of about 41 nm large crystallites has been prepared by thermal decomposition of (BiO) 2 CO 3  at 400  ◦ C. From the band gap energy of 2.3 eV obtained under the assumption of an indirect band-to-band transition and the quasi-Fermi level of −0.28±0.02 V (vs. NHE) a valence band edge position of 2.02 V is calculated. This semiconducting oxide assists a Vis light (λ ≥455 nm) aerial mineralization of the aqueous model pollutants phenol and 4-chlorophenol exhibiting maximum rates at a bismuth oxide concentration of 2.0 g L −1 . In the absence of oxygen no degradation occurs indicating that β -Bi 2 O 3  does not act as oxidizing agent. The mineralization suffers from photocorrosion of β -Bi 2 O 3  generating a mixture of α-Bi 2 O 3  and various bismuth carbonates as observed upon multiple use of the oxide in the mineralization of phenol.

Mineralization of Phenol and 4-Chlorophenol Induced by Visible Light and Assisted by Semiconducting β-Bi 2 O 3