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The Polymerization Effect on Synthesis and Visible-Light Photocatalytic Properties of Low-Temperature β-BiNbO4 Using Nb-Citrate Precursor.

Zhai H, Kong J, Wang A, Li H, Zhang T, Li A, Wu D - Nanoscale Res Lett (2015)

Bottom Line: The polymerization effect is beneficial to lower the phase formation temperature and obtain smaller particle catalysts.The Low-β BiNbO4 powder prepared by citrate method shows better degradation rate of about 1 h to decompose 80 % of MV and also displays good photocatalytic stability.The better photocatalytic performance of BiNbO4 powders prepared by citrate method can be attributed to its smaller band gap and better crystallinity.

View Article: PubMed Central - PubMed

Affiliation: Henan Key Laboratory of Photovoltaic Materials, College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, 453007, People's Republic of China. haifazhai@126.com.

ABSTRACT
Low-temperature β-BiNbO4 powders (denoted as Low-β) were prepared by citrate and Pechini methods using homemade water-soluble niobium precursors. The addition of ethylene glycol and the resultant polymerization effect on the synthesis and visible-light photocatalytic performance of β-BiNbO4 powders were fully investigated. The polymerization effect is beneficial to lower the phase formation temperature and obtain smaller particle catalysts. Both methods can synthesize catalysts with excellent performance of visible-light degradation of methyl violet (MV). The Low-β BiNbO4 powder prepared by citrate method shows better degradation rate of about 1 h to decompose 80 % of MV and also displays good photocatalytic stability. The photodegradation of MV under the visible-light irradiation followed the pseudo-first-order kinetics according to the Langmuir-Hinshelwood model, and the obtained first-order rate constant and half-time are 2.85 × 10(-2) min(-1) and 24.3 min, respectively. The better photocatalytic performance of BiNbO4 powders prepared by citrate method can be attributed to its smaller band gap and better crystallinity.

No MeSH data available.


UV-visible absorption spectra of Low-β BiNbO4 powders prepared by citrate and Pechini methods
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Fig3: UV-visible absorption spectra of Low-β BiNbO4 powders prepared by citrate and Pechini methods

Mentions: The room-temperature UV-vis absorption spectra of Low-β BiNbO4 powders are recorded in Fig. 3. A pressed BaSO4 powder was used as a reference, and the absorption spectra of the data were transformed from the diffuse reflection spectra according to the Kubelka-Munk (K-M) theory. Because Low-β BiNbO4 is the indirect band gap semiconductor, the relation between the absorption edge and photon energy (hν) can be written as follows:Fig. 3


The Polymerization Effect on Synthesis and Visible-Light Photocatalytic Properties of Low-Temperature β-BiNbO4 Using Nb-Citrate Precursor.

Zhai H, Kong J, Wang A, Li H, Zhang T, Li A, Wu D - Nanoscale Res Lett (2015)

UV-visible absorption spectra of Low-β BiNbO4 powders prepared by citrate and Pechini methods
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4666192&req=5

Fig3: UV-visible absorption spectra of Low-β BiNbO4 powders prepared by citrate and Pechini methods
Mentions: The room-temperature UV-vis absorption spectra of Low-β BiNbO4 powders are recorded in Fig. 3. A pressed BaSO4 powder was used as a reference, and the absorption spectra of the data were transformed from the diffuse reflection spectra according to the Kubelka-Munk (K-M) theory. Because Low-β BiNbO4 is the indirect band gap semiconductor, the relation between the absorption edge and photon energy (hν) can be written as follows:Fig. 3

Bottom Line: The polymerization effect is beneficial to lower the phase formation temperature and obtain smaller particle catalysts.The Low-β BiNbO4 powder prepared by citrate method shows better degradation rate of about 1 h to decompose 80 % of MV and also displays good photocatalytic stability.The better photocatalytic performance of BiNbO4 powders prepared by citrate method can be attributed to its smaller band gap and better crystallinity.

View Article: PubMed Central - PubMed

Affiliation: Henan Key Laboratory of Photovoltaic Materials, College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, 453007, People's Republic of China. haifazhai@126.com.

ABSTRACT
Low-temperature β-BiNbO4 powders (denoted as Low-β) were prepared by citrate and Pechini methods using homemade water-soluble niobium precursors. The addition of ethylene glycol and the resultant polymerization effect on the synthesis and visible-light photocatalytic performance of β-BiNbO4 powders were fully investigated. The polymerization effect is beneficial to lower the phase formation temperature and obtain smaller particle catalysts. Both methods can synthesize catalysts with excellent performance of visible-light degradation of methyl violet (MV). The Low-β BiNbO4 powder prepared by citrate method shows better degradation rate of about 1 h to decompose 80 % of MV and also displays good photocatalytic stability. The photodegradation of MV under the visible-light irradiation followed the pseudo-first-order kinetics according to the Langmuir-Hinshelwood model, and the obtained first-order rate constant and half-time are 2.85 × 10(-2) min(-1) and 24.3 min, respectively. The better photocatalytic performance of BiNbO4 powders prepared by citrate method can be attributed to its smaller band gap and better crystallinity.

No MeSH data available.