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Surfactant-Free and Controlled Synthesis of Hexagonal CeVO4 Nanoplates: Photocatalytic Activity and Superhydrophobic Property.

Yang X, Zuo W, Li F, Li T - ChemistryOpen (2015)

Bottom Line: During synthesis, solution pH, and reaction temperature were found to play important roles in determining the growth process and final morphologies of the CeVO4 products.The largest CA measured was at 169.5 ° for a glass substrate treated with 0.06 g mL(-1) CeVO4 followed by 2 % 1 H, 1 H, 2 H, 2 H-perfluorodecyltriethoxysilane.Finally, the CeVO4 nanoplates exhibited excellent photocatalytic activity in degradation of rhodamine B (RhB) under UV irradiation and was stable even after repeated cycles of use.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry, Key Lab of Environment Friendly Chemistry and Application of the Ministry of Education, Xiangtan University Xiangtan, 411105, P. R. China.

ABSTRACT
Nanomaterials with both superhydrophobic surface properties as well as photocatalytic activities could have important industrial applications. Herein, we synthesized CeVO4 nanocrystals with hexagonal nanoplate structures from the reaction of decavanadate (K6V10O28⋅9 H2O) and CeCl3⋅H2O precursors via a hydrothermal method. This synthetic route has four advantages: 1) the reaction condition is relatively mild, 2) it doesn't need surfactants or templates, 3) it requires no expensive equipment, and 4) products are of higher purity. During synthesis, solution pH, and reaction temperature were found to play important roles in determining the growth process and final morphologies of the CeVO4 products. These products were characterized spectrophotometrically and via scanning and transmission electron microscopy. Furthermore, the wettability of the as-synthesized film CeVO4 nanoplates was studied by measuring water contact angle (CA). The largest CA measured was at 169.5 ° for a glass substrate treated with 0.06 g mL(-1) CeVO4 followed by 2 % 1 H, 1 H, 2 H, 2 H-perfluorodecyltriethoxysilane. Finally, the CeVO4 nanoplates exhibited excellent photocatalytic activity in degradation of rhodamine B (RhB) under UV irradiation and was stable even after repeated cycles of use.

No MeSH data available.


A) UV/Vis absorption spectral changes of RhB under the photocatalytic degradation process. B) Kinetics of degradation of RhB under different conditions.
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fig08: A) UV/Vis absorption spectral changes of RhB under the photocatalytic degradation process. B) Kinetics of degradation of RhB under different conditions.

Mentions: The temporal evolution of the spectral changes taking place at 554 nm during the photodegradation of RhB over CeVO4 is shown in Figure 8 A. The color of the suspension changed from pink to colorless. The as-prepared nanocatalysts exhibited excellent photocatalytic activity for the photodegradation of RhB under UV irradiation (94.8 % degradation in 40 min). For comparison, we evaluated RhB degradation with photocatalysts in the dark and also in the absence of catalysts (i.e. direct photolysis) (Figure 8 B). These tests confirmed that RhB did not degrade in the dark nor in the absence of photocatalysts under UV irradiation. Thus, we can be sure that the photocatalytic effect of CeVO4 is responsible for the degradation of RhB, and that it is not due to direct photolysis of the dye nor mere adsorption on the photocatalysts. The active site appears to be V5+−O−Ce3+ for the systems. The redox cycle for oxidative dehydrogenation appears to be associated with Ce-mediated redox reactions that lead to C−C bond breakage.


Surfactant-Free and Controlled Synthesis of Hexagonal CeVO4 Nanoplates: Photocatalytic Activity and Superhydrophobic Property.

Yang X, Zuo W, Li F, Li T - ChemistryOpen (2015)

A) UV/Vis absorption spectral changes of RhB under the photocatalytic degradation process. B) Kinetics of degradation of RhB under different conditions.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4522178&req=5

fig08: A) UV/Vis absorption spectral changes of RhB under the photocatalytic degradation process. B) Kinetics of degradation of RhB under different conditions.
Mentions: The temporal evolution of the spectral changes taking place at 554 nm during the photodegradation of RhB over CeVO4 is shown in Figure 8 A. The color of the suspension changed from pink to colorless. The as-prepared nanocatalysts exhibited excellent photocatalytic activity for the photodegradation of RhB under UV irradiation (94.8 % degradation in 40 min). For comparison, we evaluated RhB degradation with photocatalysts in the dark and also in the absence of catalysts (i.e. direct photolysis) (Figure 8 B). These tests confirmed that RhB did not degrade in the dark nor in the absence of photocatalysts under UV irradiation. Thus, we can be sure that the photocatalytic effect of CeVO4 is responsible for the degradation of RhB, and that it is not due to direct photolysis of the dye nor mere adsorption on the photocatalysts. The active site appears to be V5+−O−Ce3+ for the systems. The redox cycle for oxidative dehydrogenation appears to be associated with Ce-mediated redox reactions that lead to C−C bond breakage.

Bottom Line: During synthesis, solution pH, and reaction temperature were found to play important roles in determining the growth process and final morphologies of the CeVO4 products.The largest CA measured was at 169.5 ° for a glass substrate treated with 0.06 g mL(-1) CeVO4 followed by 2 % 1 H, 1 H, 2 H, 2 H-perfluorodecyltriethoxysilane.Finally, the CeVO4 nanoplates exhibited excellent photocatalytic activity in degradation of rhodamine B (RhB) under UV irradiation and was stable even after repeated cycles of use.

View Article: PubMed Central - PubMed

Affiliation: College of Chemistry, Key Lab of Environment Friendly Chemistry and Application of the Ministry of Education, Xiangtan University Xiangtan, 411105, P. R. China.

ABSTRACT
Nanomaterials with both superhydrophobic surface properties as well as photocatalytic activities could have important industrial applications. Herein, we synthesized CeVO4 nanocrystals with hexagonal nanoplate structures from the reaction of decavanadate (K6V10O28⋅9 H2O) and CeCl3⋅H2O precursors via a hydrothermal method. This synthetic route has four advantages: 1) the reaction condition is relatively mild, 2) it doesn't need surfactants or templates, 3) it requires no expensive equipment, and 4) products are of higher purity. During synthesis, solution pH, and reaction temperature were found to play important roles in determining the growth process and final morphologies of the CeVO4 products. These products were characterized spectrophotometrically and via scanning and transmission electron microscopy. Furthermore, the wettability of the as-synthesized film CeVO4 nanoplates was studied by measuring water contact angle (CA). The largest CA measured was at 169.5 ° for a glass substrate treated with 0.06 g mL(-1) CeVO4 followed by 2 % 1 H, 1 H, 2 H, 2 H-perfluorodecyltriethoxysilane. Finally, the CeVO4 nanoplates exhibited excellent photocatalytic activity in degradation of rhodamine B (RhB) under UV irradiation and was stable even after repeated cycles of use.

No MeSH data available.