Journal ArticleDOI
Photocatalysis of sprayed nitrogen-containing Fe2O3–ZnO and WO3–ZnO composite powders in gas-phase acetaldehyde decomposition
Di Li,Hajime Haneda +1 more
TLDR
In this article, two series of nano-sized N-containing MOx-ZnO (M: Fe, W) composite powders were synthesized by spray pyrolysis.Abstract:
Two series of nano-sized N-containing MOx–ZnO (M: Fe, W) composite powders were synthesized by spray pyrolysis. The nitrogen content was controlled from 500 to 2100 ppm by changing the powder ingredients and spray pyrolysis temperature. Ultraviolet-visible (UV-Vis) spectra indicated that the N-containing MOx–ZnO powders absorbed not only ultraviolet light (λ<387 nm) like pure ZnO powder, but also part of visible light (λ<650 nm). Acetaldehyde decomposition was used as a probe reaction to evaluate the photocatalysis of these composite powders. The photocatalytic activity of the N-containing ZnO powder was pronouncedly enhanced by the WO3 addition under both UV and visible-light irradiation. However, that of the N-containing ZnO powder was suppressed by the Fe2O3 addition. A model of the semiconductor energy-band structure is proposed to explain the enhancement and suppression of photocatalytic activity.read more
Citations
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Journal ArticleDOI
Strategies of making TiO2 and ZnO visible light active.
TL;DR: The progress and developments made so far through these techniques in the visible light photocatalysis with TiO2 and ZnO are encompassed.
Journal ArticleDOI
Zinc oxide based photocatalysis: tailoring surface-bulk structure and related interfacial charge carrier dynamics for better environmental applications
TL;DR: In this article, the performance of zinc oxide (ZnO) has been improved by tailoring its surface-bulk structure and altering its photogenerated charge transfer pathways with an intention to inhibit the surfacebulk charge carrier recombination.
Journal ArticleDOI
ZnO@graphene composite with enhanced performance for the removal of dye from water
Baojun Li,Huaqiang Cao +1 more
TL;DR: In this article, a ZnO@graphene composite exhibits enhanced performance for photocatalytic degradation and filtered removal of RhB dye, in comparison with ZnOs and graphene, highlighting its potential applications for a variety of environmental issues.
Journal ArticleDOI
Nanostructured SnO2–ZnO Heterojunction Photocatalysts Showing Enhanced Photocatalytic Activity for the Degradation of Organic Dyes
M. T. Uddin,Yohann Nicolas,Céline Olivier,Thierry Toupance,Laurent Servant,Mathis M. Müller,Hans-Joachim Kleebe,Jürgen Ziegler,Wolfram Jaegermann +8 more
TL;DR: The heterostructure SnO(2)-ZnO photocatalyst showed much higher photocatalytic activities for the degradation of methylene blue than those of individual Sno(2) and ZnO nanomaterials and could be easily recycled several times opening new avenues for potential industrial applications.
Journal ArticleDOI
Magnetically separable nanocomposites based on ZnO and their applications in photocatalytic processes: A review
TL;DR: Among the most challenging problems that human beings appear to face are depleting energy sources and increasing environmental pollutions, Heterogeneous photocatalytic processes are the most reward as mentioned in this paper.
References
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Journal ArticleDOI
Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides
TL;DR: Film and powders of TiO2-x Nx have revealed an improvement over titanium dioxide (TiO2) under visible light in optical absorption and photocatalytic activity such as photodegradations of methylene blue and gaseous acetaldehyde and hydrophilicity of the film surface.
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Heterogeneous photocatalysis: Transition metal ions in photocatalytic systems
TL;DR: In this paper, the presence of transition metal ions in photocatalytic reactions is reviewed according to two main approaches: (a) the influence of metal ions on the rate of photocatalysis and (b) the transformation of the ions to less toxic species or their deposition on the semiconductor catalyst surface for recovery of expensive and useful metals.
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Role of oxygen vacancy in the plasma-treated TiO2 photocatalyst with visible light activity for NO removal
TL;DR: In this article, the photocatalytic activity for NO removal under an oxidative atmosphere has been studied over commercial TiO 2 and plasma-treated TiO2 powders, where NO 3 − was accumulated.
Journal ArticleDOI
Photocatalytic Activity of Amorphous−Anatase Mixture of Titanium(IV) Oxide Particles Suspended in Aqueous Solutions
TL;DR: In this article, an exothermic peak at ca. 723 K in the DSC pattern was assigned to the crystallization of amorphous phase to anatase, and its heat was used to evaluate the weight fraction.