The preparation of coupled WO3/TiO2 photocatalyst by ball milling

Chen, Shifu; Chen, Lei; Gao, Shen; Cao, Gengyu

doi:10.1016/j.powtec.2005.08.012

Cited by 169 publications

(61 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…All the peaks can be indexed to anatase structure and the diffraction peaks characteristic of WO 3 cannot be found in XRD patterns. The similar results have been observed by other authors: Ma et al [22] proposed that amorphous tungsten oxide phase covered the TiO 2 surface, while Shifu et al [19] reported that WO 3 was highly dispersed in the bulk phase of the catalyst. However, our XRD patterns for the as-prepared samples with different amounts of doped W in Fig.…”

Section: Characterization Studies Of the Photocatalystssupporting

confidence: 89%

“…So it suggests that WO 3 has formed a solid solution with TiO 2 phase with absence of secondary phase. However, the products prepared by physical [19] or chemical [24] method were reported to be just the mixture of two phases of TiO 2 and WO 3 , rather than a solid solution. It means that the phase/chemical compositions of the W-doped TiO 2 catalysts can be changed by different synthetic processes.…”

Section: Characterization Studies Of the Photocatalystsmentioning

confidence: 99%

“…The band gap energy of WO 3 is 2.5 eV [17], which falls within the solar spectrum. Introducing WO 3 into TiO 2 was proved to be attractive for photocatalysis research [18,19]. The results showed that coupling TiO 2 mixed-oxide could be excited using visible light, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Tian

et al. 2008

Materials Chemistry and Physics

View full text Add to dashboard Cite

a b s t r a c tNanosized W-doped TiO 2 photocatalysts were synthesized by a simple hydrothermal method, and characterized by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface area analyzer. The photocatalytic activity of undoped TiO 2 and Wdoped TiO 2 photocatalysts was evaluated by the photocatalytic oxidation degradation of methyl orange in aqueous solution. The results show that the photocatalytic activity of the W-doped TiO 2 photocatalyst is much higher than that of undoped TiO 2 , and the optimum percentage of W doped is 2.0 mol%. The enhanced photocatalytic activity of the doped photocatalyst may be attributed to the increase in the charge separation efficiency and the presence of surface acidity.

show abstract

Section: Characterization Studies Of the Photocatalystssupporting

confidence: 89%

Section: Characterization Studies Of the Photocatalystsmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Tian

et al. 2008

Materials Chemistry and Physics

View full text Add to dashboard Cite

show abstract

“…They also found higher photocatalytic activity of coupled WO xTiO 2 photocatalysts. Compared with TiO 2 , the photoexcited wavelength range of coupled photocatalyst showed a red shift and increased intensity of the light absorption [6,16,17].…”

Section: Introductionmentioning

confidence: 98%

“…Shifu et al [6] studied band gaps of WO 3 , TiO 2 and coupled WO 3 /TiO 2 photocatalysts When WO 3 and TiO 2 form a coupled photocatalyst, the photogenerated electrons of the TiO 2 conduction band can be transferred to the conduction band of WO 3 . Since the holes move in the opposite direction from the electrons, photo-generated holes might be trapped within the TiO 2 particle, which makes charge separation more efficient.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Removal of Phenol Under UV Irradiation on WO x –TiO2 Prepared by Sol–Gel Method

et al. 2008

View full text Add to dashboard Cite

New WO x -TiO 2 photocatalysts were prepared via sol-gel method from tetraisopropyl orthotitanate and WO 2 . For comparison TiO 2 was also prepared by the same method. These photocatalysts were tested for phenol degradation in an aqueous solution under UV irradiation. Experimentally measured OH radicals formation on WO xTiO 2 photocatalysts was quantitatively much higher than on TiO 2 , what increased their photocatalytic activity towards phenol decomposition. Band gap of the prepared photocatalysts was calculated from the obtained derivatives of UV-Vis/DR spectra and it was observed that E g decreased with increasing calcination temperature in both, TiO 2 and WO x -TiO 2 . This was caused by the improving crystallinity of anatase phase and formation of rutile, which had a lower value of E g than anatase. In general the presence of WO x in TiO 2 suppressed transformation of anatase to rutile.

show abstract

ZnCr₂O₄@ZnO/g‐C₃N₄: A Triple‐Junction Nanostructured Material for Effective Hydrogen and Oxygen Evolution under Visible Light

et al. 2017

View full text Add to dashboard Cite

A triple‐junction nanostructured material consisting of porous exfoliated graphitic carbon nitride (g‐C3N4) nanosheets, ZnO, and ZnCr2O4 is prepared by a one‐pot synthesis method through the calcination of a mixture of urea, thiourea, and Zn–Cr layered double hydroxide (LDH) at 450 °C. The structural, morphological, and optical properties of the prepared nanocomposites are characterized by various physicochemical techniques. This synthesis process simultaneously makes the material porous, produces exfoliated sheets of g‐C3N4, and disperses mixed metal oxides on the surface of g‐C3N4 owing to the slow evolution of significant amount of gases such as H2O, CO2, NH3, and H2S. The dispersion of ZnO and ZnCr2O4 on the surface of the g‐C3N4 exfoliated nanosheets results in a preferable resolution for visible‐light‐induced photocatalytic H2 and O2 evolution. An optimal g‐C3N4 content (60 %) in the ZnCr2O4@ZnO/g‐C3N4 nanostructured composite results in maximum H2 (847 μmol in 2 h) and O2 (455 μmol in 2 h) production in the presence of CH3OH and AgNO3, respectively, as sacrificial reagents. The apparent conversion efficiencies for H2 and O2 evolution are 28.01 and 15.0 %, respectively. The increased photocatalytic activity is attributed to the proper alignment of the band structure, synergistic effects owing to the good coordination between g‐C3N4 (Lewis base) and ZnII ions (Lewis acid), and the suppression of electron–hole recombination owing to the formation of g‐C3N4 nanosheets.

show abstract

The preparation of coupled WO3/TiO2 photocatalyst by ball milling

Cited by 169 publications

References 14 publications

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Photocatalytic Removal of Phenol Under UV Irradiation on WO x –TiO2 Prepared by Sol–Gel Method

ZnCr₂O₄@ZnO/g‐C₃N₄: A Triple‐Junction Nanostructured Material for Effective Hydrogen and Oxygen Evolution under Visible Light

Contact Info

Product

Resources

About

The preparation of coupled WO3/TiO2 photocatalyst by ball milling

Cited by 169 publications

References 14 publications

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Photocatalytic Removal of Phenol Under UV Irradiation on WO x –TiO2 Prepared by Sol–Gel Method

ZnCr2O4@ZnO/g‐C3N4: A Triple‐Junction Nanostructured Material for Effective Hydrogen and Oxygen Evolution under Visible Light

Contact Info

Product

Resources

About

ZnCr₂O₄@ZnO/g‐C₃N₄: A Triple‐Junction Nanostructured Material for Effective Hydrogen and Oxygen Evolution under Visible Light