Tao Wen, Yu-bin Tang, Fang-yan Chen and Bing-yu Mo
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.
Krzysztof Brodzik, Jerzy Walendziewski and Marek Stolarski
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Magdalena Janus, Beata Wawrzyniak, Beata Tryba and Antoni Morawski
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Beata Wawrzyniak, Magdalena Janus, Barbara Grzmil and Antoni Morawski
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Antoni Morawski, Magdalena Janus, Beata Tryba, Masahiro Toyoda, Tomoki Tsumura and Michio Inagaki
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Julia Choina, Diana Dolat, Ewelina Kusiak, Magdalena Janus and Antoni Morawski
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Mohamadreza Massoudinejad, Ali Paseban, Ahmadreza Yazdanbakhsh and Mohammad Reza Nabid
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Fucheng Yu, Hailong Hu, Bolong Wang, Haishan Li, Tianyun Song, Boyu Xu, Ling He, Shu Wang and Hongyan Duan
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.
Beata Zielińska, Beata Schmidt, Ewa Mijowska and Ryszard Kaleńczuk
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