Citation: LUAN Yun-Bo, FENG Yu-Jie, WANG Wen-Xin, XIE Ming-Zheng, JING Li-Qiang. Synthesis of BiOBr-TiO2 Nanocrystalline Composite by Microemulsion-Like Chemical Precipitation Method and Its Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, ;2013, 29(12): 2655-2660. doi: 10.3866/PKU.WHXB201310141
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Nanocrystalline BiOBr-TiO2 composite has been prepared using a microemulsion-like chemical precipitation method. The key to this method is the dual role of Br- in the synthetic process. The Br- of cetyl trimethyl ammonium bromide is able to link the cetyltrimethyl ammonium cation with anatase TiO2 to form a water-in-oil microemulsion-like system. Meanwhile, Br- is also a bromine source favorable for the fabrication of a nanoheterostructure between BiOBr and TiO2. Compared with pure TiO2 and BiOBr-TiO2 composite obtained using a traditional aqueous system, the as-obtained BiOBr-TiO2 displays high photogenerated charge separation, responsible for excellent photocatalytic activity for degrading liquid-phase phenol solution and gas-phase acetaldehyde. This result is ascribed to its effective heterostructure.
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