Conference Paper

RETRACTED ARTICLE: Photocatalytic degradation of methylene blue by magnetically separable BiVO4 supported on Fe3O4 nanoparticles

Dept. of Environ. & Municipal Eng., North China Univ. of Water Conservancy & Electr. Power, Zhengzhou, China
DOI: 10.1109/ESIAT.2010.5568721 Conference: Environmental Science and Information Application Technology (ESIAT), 2010 International Conference on, Volume: 1
Source: IEEE Xplore


Non-titania photocatalyst BiVO4 was supported on SiO2-coated Fe3O4 particles in order to solve the problems of photocatalyst recovery and reuse. The prepared photocatalyst BiVO4/SiO2/Fe3O4 (BiVO4/SFN) was proved to be nano-sized (less than 10 nm) by TEM characterization. The superparamagnetism of BiVO4/SFN was confirmed by a vibrating sample magnetometer (VSM). The photocatalyst can be easily separated experimentally by an external magnetic field in lab. XRD analysis proved the dominant existence of BiVO4 crystals. The magnetic photocatalyst BiVO4/SFN showed high photoactivity for methylene blue (MB) decolorization under visible light above 400 nm (72.1%) and a lower activity (21.8%) was observed under line spectra at 420 nm. MB was almost not degraded by P25 titania at 420 nm. The reusability experiment under visible light irradiation also demonstrated the potential application of magnetic photocatalyst in water and wastewater treatment.

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    ABSTRACT: Nitrogen-doped TiO2 nanotubes with enhanced visible light photocatalytic activity have been synthesized using commercial titania P25 as raw material by a facile P25/urea cohydrothermal method. Morphological and microstructural characteristics were conducted by transmission electron microscopy, powder X-ray diffraction, and nitrogen adsorption/desorption isotherms; chemical identifications were performed using X-ray photoelectron spectroscopy, and the interstitial nitrogen linkage to the TiO2 nanotubes is identified. The photocatalytic activity of nitrogen-doped TiO2 nanotubes, evaluated by the decomposition of rhodamine B dye solution under visible light using UV-vis absorption spectroscopy, is found to exhibit ~ four times higher than that of P25 and undoped titanate nanotubes. Factors affecting the photocatalytic activity are analyzed; it is found that the nitrogen content and surface area, rather than the crystallinity, are more crucial in affecting the photocatalytic efficiency of the nitrogen-doped TiO2 nanotubes.
    No preview · Article · Jan 2012 · International Journal of Photoenergy