Reconstruction Heterojunction of Bi4O5Br2/Bi12O17Br2 by CeO2 Nanofibers and Enhanced Visible Photocatalytic Properties for Degrading Formaldehyde
Among the tremendous efforts for enhanced photocatalysis,construction of heterojunction has been re-garded as an effective approach.In comparison to type Ⅱ heterojunction,type Ⅰ heterojunction receives less at-tention due to accumulation and increased recombination of charge carriers in one side of heterojunction.Here-in,we take Bi4O5Br2/CeO2/Bi12O17Br2 as an example of type Ⅰ heterojunction and explore means to improve the photocatalytic performance of Bi4O5Br2/CeO2/Bi12O17Br2 heterojunction.A novel Bi4O5Br2/CeO2/Bi12O17Br2 composite nanofibers photocatalytic was fabricated via a facile and convenient one-step hydrothermal method at lower tem-peratures.Results reveal that Bi4O5Br2/CeO2/Bi12O17Br2 composite photocatalyst displays the optimum photocatalyt-ic performance,and its removal efficiency of formaldehyde reaches 87％under 8 h visible light irradiation,which is improved approximately 25％,30％and 52％,than those of Bi4O5Br2/CeO2,Bi12O17Br2/CeO2 and pure CeO2 nanofibers,respectively.
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