Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

Nishikiori, Hiromasa; Sato, Takashi; Kubota, Satoshi; Tanaka, Nobuaki; Shimizu, Yuichiro; Fujii, Tsuneo

doi:10.1007/s11164-011-0374-z

Cited by 35 publications

(21 citation statements)

References 46 publications

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“…The spectrum for the untreated sample is broader than the others due to a large amount of hydroxyl groups exhibiting the peak at around 531.0-531.5 eV [28,30,32], as observed in its FTIR spectrum in Fig. 12.…”

Section: Structural Change In the Titania By Steam Treatmentmentioning

confidence: 86%

Photoinduced electron transport in dye-containing titania gel films

et al. 2012

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Amorphous dye-containing titania gel films were prepared on ITO electrodes coated with a crystalline titania foundation from titanium alkoxide sols containing a dye at room temperature. Photoinduced electron transport in the amorphous titania gel film was investigated by spectroscopic and photovoltaic measurements. Influences of the structure and morphology of the multilayered film on the photoelectron transport and electrically conductive properties were discussed. The photocurrent was observed from only the layer contacting the crystalline titania foundation. The electron transport from the amorphous upper layers was limited. Steam treatment of the electrodes improved the electron transport due to crystallization of the amorphous titania to anatase accompanied by enhancement of its electrical conductivity. The efficiency of the dye-sensitized electron transport in the steam-treated titania film was close to that of the anatase film prepared by heating at 773 K.The dye-containing titania layers functioned as efficient sensitizers.

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Section: Structural Change In the Titania By Steam Treatmentmentioning

confidence: 86%

Photoinduced electron transport in dye-containing titania gel films

et al. 2012

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“…Among transition metals, copper is a relatively available and effective dopant for trapping the electrons in the conduction band of TiO 2 [17][18][19]; additionally, many oxidative reactions are catalyzed by different copper complexes and oxides [20][21][22]. However, metal-doped semiconductors suffer from deactivation due to aggregation of the metallic dopants [23]. On the other hand, the incorporation of transition metals in the surface of carbonaceous materials appears as a powerful alternative offering great possibilities for the preparation of more efficient photocatalysts [24,25], since the dispersion of metallic species on a carbonaceous matrix can be easily accomplished (by the choice of the precursor, and impregnation with metal oxides or salts) [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Visible light driven photooxidation of phenol on TiO2/Cu-loaded carbon catalysts

Andrade¹,

Carmona²,

Mestre³

et al. 2014

Carbon

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The photocatalytic performance of titania/Cu-carbon composites was investigated towards phenol degradation under visible light. The approach consisted on the incorporation of the transition metal on the carbon component of the hybrid composite via impregnation of the carbon precursor with a metal salt followed by activation. Data showed a homogeneous dispersion of copper particles within the carbonaceous matrix, predominantly as copper (II) species. The synthesized carbons displayed a well developed nanoporous texture, although comparatively the impregnation of copper caused a marked inhibition of the textural development of the carbon precursor. The phenol photooxidation tests carried out on 1:1 titania/carbon composites showed the outstanding role of copper under visible light, with an increased efficiency in terms of phenol conversion, mineralization degree and degradation rate. This is important, since similar overall conversions were obtained with half of the amount of the photoactive semiconductor (1:1 composites). The beneficial effect of copper loading was also observed in the marked regioselectivity towards the preferential formation of catechol. Furthermore, the copper-loaded photocatalyst was found to be stable with no lixiviation or photorreduction of the copper species after illumination.

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“…In the adsorption-desorption isotherms, red and blue open symbols indicate adsorption and desorption values, respectively. IUPAC classifies the shapes of adsorption isotherms as type IV for the four samples [27], with a hysteresis loop that is associated with capillary condensation within the mesoporous regions. The hysteresis loop for all samples is type H3, which is usually indicative of aggregates of platelet particles or adsorbents containing slit pores.…”

Section: Textural Analysis From N 2 Isothermsmentioning

confidence: 99%

“…Although some studies have successfully used Cu as a dopant to improve the photocatalytic activity of TiO 2 in the degradation of some organic compounds and dyes (e.g., phenol [24], o-xylene [25], 2-propanol [26] and methylene blue [27]), only a few investigators have reported using Cu-doped TiO 2 photocatalysts in the degradation of TCE [6,15,27].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the aggregation of the dopants could lead to the deactivation of the photocatalysts. Recently, Nishikiori et al [27] carried out the photocatalysis of TCE in presence of Cu-doped TiO 2 samples synthesized by sol-gel. They found that the dopant was homogeneously dispersed on the TiO 2 , leading to a useful interaction between the Cu 2+ and Ti 4+ centers.…”

Section: Introductionmentioning

confidence: 99%

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