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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.


TEM images of Low-β BiNbO4 powders prepared by a citrate and b Pechini methods
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Fig2: TEM images of Low-β BiNbO4 powders prepared by a citrate and b Pechini methods

Mentions: The polymerization is beneficial to obtain smaller particles, as seen in the TEM imagines of Low-β BiNbO4 prepared by the two methods in Fig. 2. The particle size is between 70 and 100 nm for the Pechini method, smaller than that of the citrate method, about 150 nm, while the shape of Low-β BiNbO4 powders seems irregular for both methods due to the uncompleted crystal evolution.Fig. 2


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)

TEM images of Low-β BiNbO4 powders prepared by a citrate and b Pechini methods
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig2: TEM images of Low-β BiNbO4 powders prepared by a citrate and b Pechini methods
Mentions: The polymerization is beneficial to obtain smaller particles, as seen in the TEM imagines of Low-β BiNbO4 prepared by the two methods in Fig. 2. The particle size is between 70 and 100 nm for the Pechini method, smaller than that of the citrate method, about 150 nm, while the shape of Low-β BiNbO4 powders seems irregular for both methods due to the uncompleted crystal evolution.Fig. 2

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.