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Multi-cationic layered double hydroxides: Calcined products as photocatalysts for decomposition of NOx
Abstract Several multi-cationic layered double hydroxides were synthesized by hydrothermal method and their calcined products were evaluated for the photodegradation of NOx. The synthetic samples were characterized by powder X-ray diffraction (XRD), BET specific surface area and scanning electron microscopy (SEM). From the XRD results, it was found that doping of lanthanum in LDH structures led to poor crystallinity. Nickel zinc titanium oxide phases were observed in the XRD patterns when the samples were heated at higher temperatures. Doping the samples with Ni prevented the formation of pure zinc titanate phase. Lanthanum doping also affected the formation of nickel zinc titanium oxide. The photocatalytic activity of calcined samples was measured using decomposition of NOx molecules. Photocatalytic properties decreased with increasing calcination temperatures as a result of grain growth. Formation of ZnO phase after calcination led to effective photocatalytic decomposition of NOx molecules. Nickel zinc titanium oxide showed lower photocatalytic activity compared to pure zinc titanate. The specific surface areas of La containing LDHs were found to be higher compared to other LDHs containing different cations as a result of smaller crystal size in the former.
Graphical abstract Photocatalytic activity of calcined samples for decomposition of NOx. Display Omitted
Highlights ZnO formation from Zn LDH calcination greatly enhanced decomposition of NOx. Ni–Zn Titanate showed lower photocatalytic activity compared to Zn titanate. Ni and La in the LDH samples prevented formation of pure Zn titanate phase.
Multi-cationic layered double hydroxides: Calcined products as photocatalysts for decomposition of NOx
Abstract Several multi-cationic layered double hydroxides were synthesized by hydrothermal method and their calcined products were evaluated for the photodegradation of NOx. The synthetic samples were characterized by powder X-ray diffraction (XRD), BET specific surface area and scanning electron microscopy (SEM). From the XRD results, it was found that doping of lanthanum in LDH structures led to poor crystallinity. Nickel zinc titanium oxide phases were observed in the XRD patterns when the samples were heated at higher temperatures. Doping the samples with Ni prevented the formation of pure zinc titanate phase. Lanthanum doping also affected the formation of nickel zinc titanium oxide. The photocatalytic activity of calcined samples was measured using decomposition of NOx molecules. Photocatalytic properties decreased with increasing calcination temperatures as a result of grain growth. Formation of ZnO phase after calcination led to effective photocatalytic decomposition of NOx molecules. Nickel zinc titanium oxide showed lower photocatalytic activity compared to pure zinc titanate. The specific surface areas of La containing LDHs were found to be higher compared to other LDHs containing different cations as a result of smaller crystal size in the former.
Graphical abstract Photocatalytic activity of calcined samples for decomposition of NOx. Display Omitted
Highlights ZnO formation from Zn LDH calcination greatly enhanced decomposition of NOx. Ni–Zn Titanate showed lower photocatalytic activity compared to Zn titanate. Ni and La in the LDH samples prevented formation of pure Zn titanate phase.
Multi-cationic layered double hydroxides: Calcined products as photocatalysts for decomposition of NOx
Sarkarat, M. (author) / Komarneni, S. (author) / Rezvani, Z. (author) / Wu, Xiaoyong (author) / Yin, Shu (author) / TsugioSato (author) / Yan, Zi-Feng (author)
Applied Clay Science ; 80-81 ; 390-397
2013-07-11
8 pages
Article (Journal)
Electronic Resource
English
Aldol condensation of acetaldehyde using calcined layered double hydroxides
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