Enhancement of the photocatalytic activity of TiO2 film via surface modification of the substrate

Wu, Chun Guey; Tzeng, Liang Feng; Kuo, Yen Ting; Shu, Chung Hsien

doi:10.1016/s0926-860x(01)00907-3

Cited by 24 publications

(6 citation statements)

References 32 publications

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“…We used this equation for estimating the thickness of all films discussed in this report. This calculation is valid for the single P25 films, as those films are very similar to the original coatings studied in [45]. On the other hand, it certainly implies assumptions when applied to films containing TiO 2 nanotubes and multiwall carbon nanotubes.…”

Section: P25mentioning

confidence: 77%

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Layer-by-layer assembly of TiO₂nanowire/carbon nanotube films and characterization of their photocatalytic activity

et al. 2011

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We report on the layer-by-layer (LbL) formation of TiO(2)-MWNT-TiO(2) coatings on quartz with either trititanate derived TiO(2) nanowires or Degussa P25 as the photocatalytically active material. The optimized deposition sequence is discussed in detail and the morphology of the prepared coatings is analyzed by SEM and XRD. The heterogeneous photocatalytic performance of the coatings was tested in the methyl orange oxidation reaction. The apparent first order rate constant fell in the 0.01-0.20 h(-1) range over a 2.5 × 2.5 cm(2) film depending on the type and the thickness of the titanate coating. Building a multiwall carbon nanotube layer into the middle of the layer improved the photocatalytic activity for each material for all of the studied thicknesses. P25 based films performed 2-5 times better than TiO(2) nanowire films; however, the pores in the P25 based films were largely blocked because the isotropic P25 nanoparticles form closely packed layers by themselves and even more so with the comparably sized multiwall carbon nanotubes. Therefore, films derived from titanate nanowires appear to be more suitable for use as multifunctional, photocatalytically active filtration media.

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Section: P25mentioning

confidence: 77%

“…A 280 denotes the UV absorbance of the film at 280 nm. Wu et al [45] have established a method for estimating the thickness of double sided TiO 2 coatings on substrates from the UV light A 280 absorbance of the film measured at 280 nm Table 1. Sequences used for the preparation of the layered photocatalysts discussed in this study.…”

Section: Resultsmentioning

confidence: 99%

Layer-by-layer assembly of TiO₂nanowire/carbon nanotube films and characterization of their photocatalytic activity

et al. 2011

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“…Thin films of TiO 2 and metaldoped TiO 2 were formed on glass substrates. Transparent films were deposited by ultraspinning using a sol-gel solution made as it was reported by Wu et al 34 The substrates used were glass plates measuring 15 cm × 15 cm × 2 mm. Small glass plates of 5 × 5 cm 2 were also used as substrates for reference samples and for better physical characterization.…”

Section: Photocatalytic Filmsmentioning

confidence: 99%

Self-Cleaning Test of Doped TiO₂-Coated Glass Plates under Solar Exposure

Medina-Valtierra

Frausto-Reyes

Ramı́rez-Ortiz

et al. 2008

Ind. Eng. Chem. Res.

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Photocatalytic films of TiO2 doped with metal oxides, ZnFe2O4, ZnO, and CuO, were formed on glass plates by the ultraspinning method from Ti(IV) isopropoxide-based sol−gels. To test the self-cleaning properties of TiO2 films on glass, a layer of crystalline fluoranthene, a polycyclic aromatic compound, was placed over the glass by spraying and then exposing it to solar irradiation. The covering of fluoranthene on the 1 wt % metal oxide-doped anatase films was degraded nearly to 100% at 20 h of exposure time. Thus, the coated-glass transparency was recovered totally between 35 and 52 h of exposure time for the doped anatase film, which did not occur with anatase on glass, even after more than 85 h of solar irradiation. For some samples, a correlation was found between the weight losses of the solid compound and the intensity of the Raman vibration at 671 cm−1 during photocatalytic degradation. After 20 h of solar exposure, while the presence of fluoranthene was not detected by Raman spectroscopy, some glass plates presented ultrathin zones of degradation products. Regarding fluoranthene photodegradation and weight loss in the results when the different metal-oxide dopants were compared, a sequential efficiency was observed: ZnFe2O4 > CuO > ZnO.

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“…Chen et al synthesized macroporous P25‐TiO 2 composite films by PEG modified sol‐gel method and suggested that 500°C was the calcination temperature for excellent adhesion between the films and stainless steel substrate. Wu et al studied the modification of TiO 2 calcinated at 400~900°C on the silicon and glass substrates for photocatalysis enhancement. On the other hand, some substrates containing particular structure were used as catalyst supports for increasing specific surface area since the photocatalytic action only occurred at the surface of TiO 2 films.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of photocatalytic performance of P25‐TiO₂ nanoparticles by 3D nanoporous anodic alumina at room temperature

Chung

Liao

Kuo

et al. 2017

Int J Applied Ceramic Tech

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The commercial Degussa P25-TiO 2 nanoparticles consisting of a mixed phase are a crucial environmental catalyst but encounter the robust coating problem onto the solid support for poor photocatalysis. Here, we have demonstrated a useful green method for greatly improving water-flushing robust coating as well as photocatalysis by over-etched three-dimensional (3D) nanoporous anodic aluminum oxide (AAO) that can be fabricated by large-scale electrochemical-anodic-oxidation processing at room temperature instead of high-temperature sintering for traditional ceramic foams up to 1200°C. Also, no additional high-temperature calcination of 400~900°C was needed. The 3D porous morphology exhibited more TiO 2 particles attachment on the rough surface and enlarged pore channels than the 2D. Moreover, the over-etched 3D AAO exhibited the most attachment of TiO 2 nanoparticles after water flushing due to high-porosity-and-contact-area 3D morphology which enhances the bonding between the substrate and nanoparticles for robust coating. XRD and SEM were used for analyzing the mixed phase and 2D-3D morphology of the P25-TiO 2 nanoparticles on AAO. After immersion in Methylene blue solution and 20 hour of UV illumination, TiO 2 nanoparticles on the over-etched 3D AAO with robust coating showed the best decomposition rate compared to other supports including Si wafer, typical 2D and 3D AAO. K E Y W O R D S3D nanostructure, anodic aluminum oxide, photocatalysis, titanium oxide

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Enhancement of the photocatalytic activity of TiO2 film via surface modification of the substrate

Cited by 24 publications

References 32 publications

Layer-by-layer assembly of TiO₂nanowire/carbon nanotube films and characterization of their photocatalytic activity

Layer-by-layer assembly of TiO₂nanowire/carbon nanotube films and characterization of their photocatalytic activity

Self-Cleaning Test of Doped TiO₂-Coated Glass Plates under Solar Exposure

Enhancement of photocatalytic performance of P25‐TiO₂ nanoparticles by 3D nanoporous anodic alumina at room temperature

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Enhancement of the photocatalytic activity of TiO2 film via surface modification of the substrate

Cited by 24 publications

References 32 publications

Layer-by-layer assembly of TiO2nanowire/carbon nanotube films and characterization of their photocatalytic activity

Layer-by-layer assembly of TiO2nanowire/carbon nanotube films and characterization of their photocatalytic activity

Self-Cleaning Test of Doped TiO2-Coated Glass Plates under Solar Exposure

Enhancement of photocatalytic performance of P25‐TiO2 nanoparticles by 3D nanoporous anodic alumina at room temperature

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Product

Resources

About

Layer-by-layer assembly of TiO₂nanowire/carbon nanotube films and characterization of their photocatalytic activity

Layer-by-layer assembly of TiO₂nanowire/carbon nanotube films and characterization of their photocatalytic activity

Self-Cleaning Test of Doped TiO₂-Coated Glass Plates under Solar Exposure

Enhancement of photocatalytic performance of P25‐TiO₂ nanoparticles by 3D nanoporous anodic alumina at room temperature