Photocatalytic hydrogen production with visible light over Mo and Cr-doped BiNb(Ta)O4

Almeida, Cristiane Gomes; Araujo, Rafael B.; Yoshimura, Rafael G.; Mascarenhas, Artur J.S.; Silva, Antônio Ferreira da; Araújo, C. Moysés; Silva, Luciana da

doi:10.1016/j.ijhydene.2013.11.019

Cited by 24 publications

(2 citation statements)

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“…Bismuth-based photocatalysts, due to their excellent photo-degradation performance for organic contaminant using visible light, have attracted much attention, such as BiWO 6 [ 15 ], BiOX (X = Cl, Br, I) [ 16 , 17 ], Bi 2 O 2 CO 3 [ 18 ], BiNb 3 O 15 [ 19 ], and BiNbO 4 [ 20 – 25 ]. Among these materials, BiNbO 4 is investigated for H 2 generation and contaminant degradation under visible light, exhibiting greater photocatalytic performance than TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Efficient Visible-Light Photocatalytic Properties in Low-Temperature Bi-Nb-O System Photocatalysts

et al. 2016

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Low-temperature Bi-Nb-O system photocatalysts were prepared by a citrate method using homemade water-soluble niobium precursors. The structures, morphologies, and optical properties of Bi-Nb-O system photocatalysts with different compositions were investigated deeply. All the Bi-Nb-O powders exhibit appreciably much higher photocatalytic efficiency of photo-degradation of methyl violet (MV), especially for Bi-Nb-O photocatalysts sintered at 750 °C (BNO750), only 1.5 h to completely decompose MV, and the obtained first-order rate constant (k) is 1.94/h. A larger degradation rate of Bi-Nb-O photocatalysts sintered at 550 °C (BNO550) can be attributed to the synergistic effect between β-BiNbO4 and Bi5Nb3O15. Bi5Nb3O15 with small particle size on β-BiNbO4 surface can effectively short the diffuse length of electron. BNO750 exhibits the best photocatalytic properties under visible-light irradiation, which can be attributed to its better crystallinity and the synergistic effect between β-BiNbO4 and α-BiNbO4. The small amount of α-BiNbO4 loading on surface of β-BiNbO4 can effectively improve the electron and hole segregation and migration. Holes are the main active species of Bi-Nb-O system photocatalysts in aqueous solution under visible-light irradiation.

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Section: Introductionmentioning

confidence: 99%

Efficient Visible-Light Photocatalytic Properties in Low-Temperature Bi-Nb-O System Photocatalysts

et al. 2016

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“…14 Strategies to extend their light absorption include dye sensitizing, 15 nitridizing/sulfurizing, [16][17][18][19][20] doping with foreign elements 21 etc. Of note is the transition metal doping scheme which is simple and cost-effective, being quite successful in a number of systems such as Rh doped Y 2 Ti 2 O 7 , 22 Rh doped TiO 2 , 23 Co doped Ta 3 N 5 , 24 Mo/Cr doped BiTaO 4 , 25 etc. Successful doping generally requires that the dopant ions have comparable ionic radii and charges to the host ions, allowing only a small disturbance to the crystal framework.…”

Section: Introductionmentioning

confidence: 99%

Bismuth and chromium co-doped strontium titanates and their photocatalytic properties under visible light irradiation

Xie

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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Modification of prototype perovskite compound SrTiO3 by introducing foreign elements has been an appealing means to endow this wide band gap semiconductor with visible light responses. Here we systematically investigated a series of Sr1-xBixTi1-xCrxO3 solid solution compounds prepared by two different synthetic routes, namely, solid state reactions and the hydrothermal method. Their crystal structures as well as other physicochemical properties were explored. Our results showed that a number of important factors such as microstructures, crystallinity, light absorbance and surface compositions etc. are all strongly correlated with the synthetic methods used. The hydrothermal method is generally helpful for morphology controls as well as avoiding Cr(6+) defects and Sr segregation at the surface, thereby contributing to a high photocatalytic activity. Better performance normally occurs in samples with a high crystallinity and free of defects like Bi(5+). Theoretical calculations suggest that Cr plays an important role in band gap reduction and photocatalytic reactions, while Bi only acts as a constituent cation for the perovskite structure and does not significantly alter the electronic structures near the Fermi level. Our findings have revealed how synthetic routes are relevant to the final photocatalytic properties of a compound, and therefore comparisons among various photocatalysts have to include concerns about their preparation history.

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Microwave-Assisted Synthesis of Bismuth Niobate/Tungsten Oxide Photoanodes for Water Splitting

et al. 2020

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Photocatalytic hydrogen production with visible light over Mo and Cr-doped BiNb(Ta)O4

Cited by 24 publications

References 20 publications

Efficient Visible-Light Photocatalytic Properties in Low-Temperature Bi-Nb-O System Photocatalysts

Efficient Visible-Light Photocatalytic Properties in Low-Temperature Bi-Nb-O System Photocatalysts

Bismuth and chromium co-doped strontium titanates and their photocatalytic properties under visible light irradiation

Microwave-Assisted Synthesis of Bismuth Niobate/Tungsten Oxide Photoanodes for Water Splitting

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