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A new method of preparation of AgBr/TiO2 composites and investigation of their photocatalytic activity

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Abstract

Silver bromide/titanium dioxide composites were first prepared using titanic acid nanobelts (TAN) as the TiO2 source. First, TAN reacted with AgNO3 to prepare Ag-incorporated TAN by the ion-exchange method, and then AgBr/TAN was obtained after adding NaBr. Finally, AgBr/TAN was transformed to AgBr/TiO2 composites by calcination. The post-treated calcination would not only convert TAN to TiO2 (H2Ti2O4(OH)2 → 2H2O + 2TiO2), but also increase the effective contact between AgBr and TiO2, further to improve the separation of photo-generated electron-holes. The advantage of this preparation method is the small particle size (ca. 10–20 nm) and well dispersion of AgBr on the surface of TiO2, and close contact between AgBr and TiO2. The effect of the different calcination temperature on the morphology, structure, and properties of AgBr/TiO2 composites was investigated in detail. The AgBr/TiO2 composites were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), and ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS). Comparing with pure TAN, AgBr, and AgBr/P25 mixture, the AgBr/TiO2 composites exhibited enhanced photocatalytic activity in decomposition of methyl orange (MO) under visible light irradiation.

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Acknowledgments

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (No. 21103042), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20114103120001), and the Scientific Research Foundation of Henan University (No. 2010YBZR013).

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Authors and Affiliations

  1. Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004, China

    Yangyang Xing, Rui Li, Qiuye Li & Jianjun Yang

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  1. Yangyang Xing
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  2. Rui Li
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  3. Qiuye Li
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  4. Jianjun Yang
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Correspondence to Qiuye Li.

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Xing, Y., Li, R., Li, Q. et al. A new method of preparation of AgBr/TiO2 composites and investigation of their photocatalytic activity. J Nanopart Res 14, 1284 (2012). https://doi.org/10.1007/s11051-012-1284-8

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  • DOI: https://doi.org/10.1007/s11051-012-1284-8

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