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Total doped TiO 2 Visible Preparation, Characterization and Properties

Author: ChengXiuWen
Tutor: YuXiuJuan
School: Heilongjiang University
Course: Environmental Science
Keywords: TiO2 tri-doped visible-light RhB phenol
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 1
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Abstract


Nano-sized TiO2 photocatalytic technology has developed to be a kind of high efficient and environmental pollution control technologies. The current research focuses on the enhancement of photocatalytic activity and the efficiency of utilizing visible-light. Based on the current research of photocatalyst doping TiO2 home and abroad, tri-doped TiO2 nano-particles were synthetized in this paper. The structures and physical and chemical properties of the as-prepared samples were characterized by X-ray diffraction （XRD）, nitrogen adsorption/desorption measurements （BET）, Raman spectroscopy （Raman）, X-ray photoelectron spectroscopy （XPS）, Fourier transition infrared spectra （FT-IR）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, UV-Vis diffuse reflectance spectroscopy （DRS） and surface photo-voltage spectroscopy （SPS）. The photocatalytic activities of the tri-doped TiO2 photocatalysts were evaluated through the degradation of RhB and phenol under visible-light irradiation, which were compared with the behaviors of the home-made pure TiO2 and commercial Degussa P25TiO2. In addition, the mechanisms of the enhancement of visible-light photocatalytic activity of the tri-doped TiO2 nano-particles were analyzed in detailed.（1） Fe-N-S-tridoped TiO2 photocatalyst was prepared via a sol-gel process by using ammonium ferrous sulfate as dopant. The effects of the doping dosage and calcining temperature on the structure and photocatalytic activity of the tri-doped TiO2 photocatalysts were investigated. The results showed that the extension of light absorption edge in the range of visible-light was up to 670nm. The modified TiO2 calcined at 350℃with 1.0 mol% ammonium ferrous sulfate content exhibited the best photocatalytic performance. Under the visible-light irradiation with 120min, the removal rate for RhB could achieve 91.5%. （2） C-N-S-tridoped TiO2 photocatalyst was prepared through a sol-gel process by using cystine as dopant. The effects of the doping dosage and calcining temperature on the structure and photocatalytic activity of the tri-doped TiO2 photocatalysts were also investigated. The results showed that the extension of light absorption edge in the range of visible-light was up to 800nm. The modified TiO2 calcined at 350℃with 4.2 mol% cystine content exhibited the best photocatalytic performance. Under the visible-light irradiation with 120min, the removal rate for RhB could achieve 100%.（3） Under the 350W xenon lamp irradiation, the degradation of phenol was investigated with the as-prepared Fe-N-S-TiO2 and C-N-S-TiO2 photocatalysts previous. It was found that the two catalysts exhibited the excellent performance. Nevertheless, the removal rates of phenol with C-N-S-TiO2 and Fe-N-S-TiO2 photocatalysts were 2.5 and 2.2 times to that of home-made TiO2, respectively. In addition, the reactions followed Langmuir-Hinshelwood （L-H） pseudo-first-order reaction kinetics model. Furthermore, C-N-S-TiO2 presented higher photocatalytic activity than that of Fe-N-S-TiO2, and its apparent rate constant （kAPP） and half-value period （t1/2） were 0.79h-1 and 0.88h, respectively.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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