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Preparation, characterization of a ceria loaded carbon nanotubes nanocomposites photocatalyst and degradation of azo dye Acid Orange 7

Abstract

A ceria loaded carbon nanotubes (CeO2/CNTs) nanocomposites photocatalyst was prepared by chemical precipitation, and the preparation conditions were optimized using an orthogonal experiment method. HR-TEM, XRD, UV-Vis/DRS, TGA and XPS were used to characterize the photocatalyst. Nitrogen adsorption-desorption was employed to determine the BET specific surface area. The results indicated that the photocatalyst has no obvious impurities. CeO2 was dispersed on the carbon nanotubes with a good loading effect and high loading efficiency without agglomeration. The catalyst exhibits a strong ability to absorb light in the ultraviolet region and some ability to absorb light in the visible light region. The CeO2/CNTs nanocomposites photocatalyst was used to degrade azo dye Acid Orange 7 (40 mg/L). The optical decolorization rate was 66.58% after xenon lamp irradiation for 4 h, which is better than that of commercial CeO2 (43.13%). The results suggested that CeO2 loading on CNTs not only enhanced the optical decolorization rate but also accelerated the separation of CeO2/CNTs and water.

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Photodegradation of organic compounds in water

. Mater. Chem. , 2000 , 10, 2151. Ahmed M. S., Attia Y. A.: Aerogel materials for photocatalytic detoxification of cyanide wastes in water, J. Non Cryst. Solids , 1995 , 186, 402. Ismail A. A., Ibrahim I. A., Ahmed M. S.: Mohamed R.M., El-Shall H., Sol-gel synthesis of titania-silica photocatalyst for cyanide photodegradation, J. Photochem. Photobiol. A , 2004 , 163, 445. Deng Z., Wang J., Zhang Y., Weng Z., Zhang Z., Zhou B., Shen B., Cheng L.: Preparation and photocatalytic activity of

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Dye decomposition on P25 with enhanced adsorptivity

semiconductor particulate system under the irradiation of visible light. Catal. Comm. 8, 429-433 doi:10.1016/j.catcom.2006.07.001. Asahi, R., Morikawa, T., Ohwaki, T., Aoki, K. & Taga, Y. (2001). Visible-light photocatalysis in nitrogen-doped titanium oxides. Science. 293, 269-271. DOI: 10.1126/science.1061051. Ihara, T., Miyoshi, M., Iriyama, Y., Matsumoto, O. & Sugihara, S. (2003). Visible-light-active titanium oxide photocatalyst realized by an oxygen-deficient structure and by nitrogen doping. Appl. Catal. B

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Preparation of the TiO2 photocatalyst using pressurized ammonia

., Kang M. S., Yi J.: Photocatalytic activation of TiO 2 under visible light using Acid Red 44, Catalysis Today , 2003 , 87 , 77. Guillard C., Disdier J., Monnet C., Dussaud J., Malato S., Blanco J., Maldonado M. I., Herrmann J. M.: Solar efficiency of a new deposited titania photocatalyst: chlorophenol, pesticide and dye removal applications, Applied Catalysis B: Environmental , 2003 , 46 , 319. Shifu C., Lei C., Shen G., Gengyu C.: The preparation of nitrogen-doped photocatalyst TiO 2-x N x by ball milling

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Carbon modified TiO2 photocatalysts for water purification

-containing titanium dioxide photocatalyst. Appl. Catal. B: Environ.   32 (4), 215-227. Arana, J., Dona-Rodriguez, J. M., Tello Rendon, E., Garriga i Cabo, C., Gonzalez-Diaz, O., Herrera-Melian, J.A., Perez-Pena, J., Colon, G. & Navio, J.A. (2003). TiO 2 activation by using activated carbon as a support: Part I. Surface characterisation and decantability study. Appl. Catal. B: Environ.   44 (2), 161-172. DOI: 10.1016/S0926-3373(03)00107-3. Arana, J., Dona-Rodriguez, J.M., Tello Rendon, E., Garriga i Cabo, C., Gonzalez-Diaz, O

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TiO2 modified by ammonia as a long lifetime photocatalyst for dyes decomposition

References Hong, X. T., Wang, Z. P., Cai, W. M., Lu, F., Zhang, J., Yang, Y. Z., Ma, N. & Liu, Y. (2005). Visible-Light-Activated Nanoparticle Photocatalyst of Iodine-Doped Titanium Dioxide. Chem. Mater. 17(6), 1548-1552. DOI: 10.1021/ cm047891k. Yamashita, H., Harada, M., Misaka, J., Takeuchi, M., Nappolian, B. & Anpo, M. (2003). Photocatalytic degradation of organic compounds diluted in water using visible light-responsive metal ion-implanted TiO 2 catalysts: Fe ionimplanted TiO 2 . Catal. Today. 84

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Preparation, Characterization, and Application of N,S-codoped TiO2/Montmorillonite Nanocomposite for the Photocatalytic Degradation of Ciprofl oxacin: Optimization by Response Surface Methodology

-to-volume ratios. J. Phys. Chem. C. 114(6), 2717-2723. DOI: 10.1021/jp910486f. 14. Li, Y. & Kim, S.J. (2005). Synthesis and characterization of nano titania particles embedded in mesoporous silica with both high photocatalytic activity and adsorption capability. J. Phys. Chem. B., 109(25), 12309-12315. DOI: 10.1021/jp0512917. 15. Zhang, G., Ding, X., Hu, Y., Huang, B., Zhang, X. & Qin, X., et al. (2008). Photocatalytic Degradation of 4BS Dye by N, S-Codoped TiO2 Pillared Montmorillonite Photocatalysts under Visible-Light Irradiation. J. Phys. Chem

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Comparison of NaNbO3 and NaTaO3 as the photocatalysts in the reaction of hydrogen generation

.solidstatesciences.2008.08.001. Kato, H., Asakura, K. & Kudo, A. (2003). Highly Efficient Water Splitting into H 2 and O 2 over Lanthanum-Doped NaTaO 3 Photocatalysts with High Crystallinity and Surface Nanostructure. J. Am. Chem. Soc. 125, 3082-3089. Zielińska, B. & Morawski, A. W. (2005) TiO2 photocatalysts promoted by alkali metals. Appl. Catal, B : 55, 221-226. DOI:10.1016/j.apcatb.2004.08.015. Liu, J. W., Chen, G., Li, Z. H. & Ahang, Z. G. (2007). Hydrothermal synthesis and photocatalytic

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Effects of Al doping on defect behaviors of ZnO thin film as a photocatalyst

Abstract

Al doped ZnO (AZO) thin films were prepared on silica substrates by sol-gel method. The films showed a hexagonal wurtzite structure with a preferred orientation along c-axis. Suitable Al doping dramatically improved the crystal quality compared to the undoped ZnO films. Dependent on the Al dopant concentration, the diffraction peak of (0 0 2) plane in XRD spectra showed at first right-shifting and then left-shifting, which was attributed to the change in defect concentration induced by the Al dopant. Photocatalytic properties of the AZO film were characterized by degradation of methyl orange (MO) under simulated solar light. The transmittance of the films was enhanced by the Al doping, and the maximum transmittance of 80 % in the visible region was observed in the sample with Al concentration of 1.5 at.% (mole fraction). The film with 1.5 at.% Al doping achieved also maximum photocatalytic activity of 68.6 % under solar light. The changes in the film parameters can be attributed to the variation in defect concentration induced by different Al doping content.

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PANI/NaTaO3 composite photocatalyst for enhanced hydrogen generation under UV light irradiation

LITERATURE CITED 1. Kato, H. & Kudo, A. (1998). New tantalate photocatalysts for water decomposition into H 2 and O 2 . Chem. Phys. Lett. 295, 487–492. 2. Ikeda, S., Fubuki, M., Takahara, Y.K. & Matsumura, M. (2006). Photocatalytic activity of hydrothermally synthesized tantalate pyrochlores for overall water splitting. Appl. Catal. A 300, 186–190. DOI: 10.1063/1.4928288. 3. Kato, H. & Kudo, A. (1999). Photocatalytic decomposition of pure water into H 2 and O 2 over SrTa 2 O 6 prepared by a flux method. Chem. Lett. 28, 1207–1208. DOI

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