by sol-gel method. The photocatalytic experiment shows the photocatalytic activity of the samples is enhanced compared to pure γ-Bi2O3, when the composite content (x) is under 30 wt. %. The best composite content is 10 wt. %. In this case, the rate constant is 0.2495 min-1, and is 4.1 times of that of γ-Bi2O3. Under irradiation of visible light, photoinduced holes of Fe2O3 migrate to the VB of γ-Bi2O3 and contribute to the degradation of RhB. This study indicates that constructing a heterojunction between γ-Bi2O3/Fe2O3(x) helps to utilize visible-light and to promote separation of electron-hole pair.
Acknowledgements
This work has been supported by the National Natural Science Foundation of China (No. 50732004 and No. 51072012).
机械工程导论心得体会论文报告References
[1] Cabot A., Marsal A., Arbiol J. and Morante J.R., Bi2O3 as a selective sensing material for NO detection, Sens. Actuators B, 2004, 99 (1): 74.
[2] Shuk P., Wiemhöfer H. -D., Guth U., Göpel W. and Greenblatt M., Oxide ion conducting solid electrolytes based on Bi2O3, Solid State Ion., 1996, 89 (3-4): 179.
[3] Moens L., Ruiz P., Delmon B. and Devillers M., Enhancement of total oxidation of isobutene on bismuth-promoted tin oxide catalysts, Catal. Lett., 1997, 46 (1-2): 93.
[4] Sammes N.M., Tompsett G.A., Näfe H. and Aldinger F., Bismuth based oxide electrolytes—structure and ionic conductivity, J. Eur. Ceram. Soc., 1999, 19 (10): 1801.
[5] Zou W., Hao W.C., Xin X. and Wang T.M., Effect of Crystal Structure on Visible-Light Photocatalytic Properties of Bi2O3 Photocatalyst, Chinese J. Inorg. Chem., 2009, 25 (11): 1971.
[6] Bessekhouad Y., Robert D. and Weber J.-V., Photocatalytic activity of Cu2O/TiO2, Bi2O3/TiO2 and ZnMn2O4/TiO2 heterojunctions, Catal. Today, 2005, 101 (3-4): 315.
[7] Li L.Z. and Yan B., BiVO4/Bi2O3 submicrometer sphere composite: Microstructure and photocatalytic activity under visible-light irradiation, J. Alloy Compd., 2009, 476 (1-2): 624.
[8] Chai S.Y., Kim Y.J., Jung M.H. et al., Heterojunctioned BiOCl/Bi2O3, a new visible light photocatalyst, J. Catal., 2009, 262 (1): 144.
[9] Zhang H.T., Ouyang S.X., Li Z.S., et al., Preparation, characterization and photocatalytic activity of polycrystalline Bi2O3/SrTiO3 composite powders, J. Phys. Chem. Solids, 2006, 67 (12): 2501.
[10] Neppolian B., Kim Y., Ashokkumar M. et al., Preparation and properties of visible light responsive ZrTiO4/Bi2O3 photocatalysts for 4-chlorophenol decomposition, J. Hazard. Mater., 2010, 182 (1-3): 557.
[11] Li L.Z., Yan B., CeO2–Bi2O3 nanocomposite: Two step synthesis, microstructure and photocatalytic activity, J. Non-Cryst. Solids, 2009, 355 (13): 776.
[12] Hameed A., Gombac V., Montini T. et al., Synthesis, characterization and photocatalytic activity of NiO–Bi2O3 nanocomposites, Chem. Phys, 2009, 472 (4-6): 212.
[13] Gurlo A., Bârsan N., Oprea A., Sahm M., Sahm T. and Weimar U., An n- to p-type conductivity transition induced by oxygen adsorption on α-Fe2O3, Appl. Phys. Lett., 2004, 85 (2): 2280.
[14] Craig S.T., Ollis D.F., Photocatalytic degradation of organic water contaminants: Mechanisms involving hydroxyl radical attack, J. Catal. Vol., 1990, 122 (1): 178.
[15] Shi L., Li C., Gu H. and Fang D., Morphology and properties of ultrafine SnO2–TiO2 coupled semiconductor particles, Mater. Chem. Phys., 2000, 62 (1): 62.
[16] Serpone N., Borgarello E. and Gratzel M., Visible light induced generation of hydrogen from H2S in mixed semiconductor dispersion:improved efficiency through inter-particle electron transfer, J. Chem. Soc., Chem. Commun., 1984 (6): 342.
[17] Serpone N., Maruthamuthu P., Pichat P., Pelizzetti E. and Hidaka H., Exploiting the interparticle electron transfer process in the photocatalysed oxidation of phenol, 2-chlorophenol and pentachlorophenol: chemical evidence for electron and hole transfer between coupled semiconductors, J. Photochem. Photobiol. A: Chem., 1995, 85 (3): 247.
[18] Zhang X.T., Cao Y.A., Kan S.H. et al., Study on the photo-induced interfacial charge transfer in TiO2/Fe2O3 heterostructured composite film, Thin Solid Films, 1998, 327-329: 568.
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