Unpredictable adsorption and visible light induced decolorization of nano rutile for the treatment of crystal violet |
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| Affiliation: | 1. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China;2. College of Information Science and Engineering, Ningbo University, Ningbo 315201, PR China;3. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, PR China;4. Ningbo Key Laboratory of Silicon and Organic Thin Film Optoelectronic Technologies, Ningbo 315201, PR China |
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| Abstract: | Photocatalysts containing different ratios of anatase and rutile are prepared via heat treatment of Degussa P-25 titania. X-ray diffraction (XRD), Bruuauer-Emmett-Teller (BET), ultraviolet–visible light diffuse reflectance spectra (DRS), Raman spectra (Raman), positron annihilation lifetime spectra (PAL) and temperature-programmed desorption (TPD) are applied to investigate the phase composition of the synthesized catalysts. Using crystal violet (CV) as the target pollutant, the unexpected visible light decolorization of rutile is observed. Despite the decreased specific surface area, the as-synthesized rutile samples exhibit much higher adsorption capability of CV than P-25 does, which in turn leads to improved photoreaction efficiency. Since the rutile samples can't absorb the visible light, the degradation under visible light irradiation is attributed to self-sensitization of CV on the surface of rutile. |
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| Keywords: | Rutile Crystal violet Adsorption Decolorization efficiency |
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