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      AgBr-Coupled TiO2: A Visible Heterostructured Photocatalyst for Degrading Dye Pollutants

      , , , ,

      International Journal of Photoenergy

      Hindawi Limited

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          Abstract

          A series of AgBr/TiO 2visible photocatalysts with heterojunction structure was synthesized using Ti(OC 4H 9) 4, KBr, and AgNO 3as precursors. The phase composition, particle morphology and size, microstructures, and absorbance of these photocatalysts were characterized by X-ray diffraction, transmission electron microscope (TEM), high-resolution TEM, and UV-vis spectra. It was found that the coupled AgBr/TiO 2was an effective photocatalyst to degrade the methylene blue under visible light irradiation, compared with the other noncoupled photocatalysts of AgBr, AgBr/P25, and P25. The photocatalytic activities of AgBr/TiO 2increase first and then decrease with increasing the mass ratio of m AgNO 3 / m TiO 2 and the photocatalyst with the mass ratio of 3.35 has the highest photocatalytic activity. The results showed that the coupled photocatalyst has the particle size of about 15 nm with homogeneous dispersion and has the strongest absorption in whole UV-vis light region (250∼800 nm) originated from the synergetic effect of heterostructured AgBr/TiO 2. The coupled AgBr/TiO 2photocatalyst can keep stable photocatalytic activity after five-circle runs.

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          Most cited references 23

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          Environmental Applications of Semiconductor Photocatalysis

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            Visible-light photocatalysis in nitrogen-doped titanium oxides.

             K. Aoki,  R Asahi,  Y Taga (2001)
            To use solar irradiation or interior lighting efficiently, we sought a photocatalyst with high reactivity under visible light. Films and powders of TiO(2-x)N(x) have revealed an improvement over titanium dioxide (TiO2) under visible light (wavelength < 500 nanometers) in optical absorption and photocatalytic activity such as photodegradations of methylene blue and gaseous acetaldehyde and hydrophilicity of the film surface. Nitrogen doped into substitutional sites of TiO2 has proven to be indispensable for band-gap narrowing and photocatalytic activity, as assessed by first-principles calculations and x-ray photoemission spectroscopy.
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              Titanium dioxide nanomaterials: synthesis, properties, modifications, and applications.

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                Author and article information

                Journal
                International Journal of Photoenergy
                International Journal of Photoenergy
                Hindawi Limited
                1110-662X
                1687-529X
                2012
                2012
                : 2012
                :
                : 1-7
                Article
                10.1155/2012/254201
                © 2012

                http://creativecommons.org/licenses/by/3.0/

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