Hydrothermal Synthesis, Characterization, and Visible Light‐Driven Photocatalytic Properties of Bi<sub>2</sub>WO<sub>6</sub> Nanoplates

Phuruangrat, Anukorn; Dumrongrojthanath, Phattranit; Ekthammathat, Nuengruethai; Thongtem, Somchai; Thongtem, Titipun

doi:10.1155/2014/138561

Cited by 26 publications

(20 citation statements)

References 32 publications

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“…At 210 ∘ C, only some stunted characteristic peaks of Bi 2 WO 6 were found. This phenomenon might be because temperatures higher than 120 ∘ C were in favor of the growth of Bi 2 WO 6 and probably went against the growth of BiOBr [23]. The XRD results indicate that the crystal structures of BiOBr-Bi 2 WO 6 composites could be selectively synthesized by adjusting the hydrothermal reaction holding time and temperature, and the well-crystallized BiOBr-Bi 2 WO 6 composites could be synthesized with facile experimental conditions at 120 ∘ C for 6 h.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Analysis, and Testing of BiOBr-Bi₂WO₆Photocatalytic Heterojunction Semiconductors

Meng

Zhang

2015

International Journal of Photoenergy

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In photocatalysis, the recombination of electron-hole pairs is generally regarded as one of its most serious drawbacks. The synthesis of various composites with heterojunction structures has increasingly shed light on preventing this recombination. In this work, a BiOBr-Bi2WO6photocatalytic heterojunction semiconductor was synthesized by the facile hydrothermal method and applied in the photocatalytic degradation process. It was determined that both reaction time and temperature significantly affected the crystal structure and morphologies of the photocatalysts. BiOBr (50 at%)-Bi2WO6composites were prepared under optimum synthesis conditions (120°C for 6 h) and by theoretically analyzing the DRS results, it was determined that they possessed the suitable band gap (2.61 eV) to be stimulated by visible-light irradiation. The photocatalytic activities of the as-prepared photocatalysts were evaluated by the degradation ofRhodamine B (RhB)under visible-light irradiation. The experimental conditions, including initial concentration, pH, and catalyst dosage, were explored and the photocatalysts in this system were proven stable enough to be reused for several runs. Moreover, the interpreted mechanism of the heterojunction enhancement effect proved that the synthesis of a heterojunction structure provided an effective method to decrease the recombination rate of the electron-hole pairs, thereby improving the photocatalytic activity.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Analysis, and Testing of BiOBr-Bi₂WO₆Photocatalytic Heterojunction Semiconductors

Meng

Zhang

2015

International Journal of Photoenergy

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“…In the FT-IR spectra of 1 – 3 , between 500 and 1000 cm −1 , the characteristic peaks of W–O modes can be observed (Figure 7). The band at 820 cm −1 belongs to the stretching vibration of Bi–O, and the others below 750 cm −1 are assigned to the stretching and bridging stretching mode of W–O and W–O–W, respectively [25,28,50,54,67].…”

Section: Resultsmentioning

confidence: 99%

“…The weak band appearing at 433 cm −1 is assigned to the antisymmetric mode of WO 6 octahedral, while at 310 cm −1 , the translational mode of the simultaneous move of Bi 3+ and WO 6 6− can be found. The band at 300 cm −1 corresponds to the mode of the WO 2 terminal groups (Figure 1) [29,42,50,68,69].…”

Section: Resultsmentioning

confidence: 99%

“…So far, numerous studies have reported on the effect of temperature, time, amount of raw materials/ additives and pH in changing the morphology (flakes, sheets, spherical figures, rods, flower or nest-like architectures, etc.) [24,43,44,45,46,47,48,49,50,51,52]. There are some studies focusing on the effect of changing the pH at 200 °C, however, in these works, the very acidic (below pH 1) and very alkaline (above pH 13) ranges were not studied.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

et al. 2019

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In this study, Bi2WO6 was prepared by the hydrothermal method. The effects of reaction temperature (150/170/200 °C) and reaction time (6/12/24 h) were investigated. The role of strongly acidic pH (1 >) and the full range between 0.3 and 13.5 were studied first. Every sample was studied by XRD and SEM; furthermore, the Bi2WO6 samples prepared at different temperatures were examined in detail by EDX and TEM, as well as FT-IR, Raman and UV-vis spectroscopies. It was found that changing the temperature and time slightly influenced the crystallinity and morphology of the products. The most crystallized product formed at 200 °C, 24 h. The pure, sheet-like Bi2WO6, prepared at 200 °C, 24 h, and 0.3 pH, gradually transformed into a mixture of Bi2WO6 and Bi3.84W0.16O6.24 with increasing pH. The nanosheets turned into a morphology of mixed shapes in the acidic range (fibers, sheets, irregular forms), and became homogenous cube- and octahedral-like shapes in the alkaline range. Their band gaps were calculated and were found to vary between 2.66 and 2.59 eV as the temperature increased. The specific surface area measurements revealed that reducing the temperature favors the formation of a larger surface area (35.8/26/21.6 m2/g belonging to 150/170/200 °C, respectively).

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“…9 The glass coated with AquaSun coating exhibits three peaks (at ca. 161, 311, and 799 cm − 1 ) attributable to Bi 2 WO 6 encapsulated in the ORMOSIL, 10 and two peaks (around 560 and 1095 cm − 1 ) due to the glass substrate.…”

Section: Resultsmentioning

confidence: 99%

Advanced Protection Against Marine Biofouling Using Solar Light

Scandura¹,

Ciriminna

Ozer³

et al. 2017

Preprint

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We undertook prolonged testing of a new xerogel coating (AquaSun) to protect from marine biofouling a surface probe immersed in the seawater of Abu Dhabi. Electron microscopy, Raman mapping, and photoluminescence experiments coupled to extensive analyses of marine water before and after 122 days of testing showed excellent action against biofouling when irradiating the probe with visible light. Considering the high chemical and mechanical stability and the low cost of the sol-gel coating, the technology has significant potential en route to replacing conventional antifouling and foul release coatings with a single product of broad applicability.

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Hydrothermal Synthesis, Characterization, and Visible Light‐Driven Photocatalytic Properties of Bi₂WO₆ Nanoplates

Cited by 26 publications

References 32 publications

Synthesis, Analysis, and Testing of BiOBr-Bi₂WO₆Photocatalytic Heterojunction Semiconductors

Synthesis, Analysis, and Testing of BiOBr-Bi₂WO₆Photocatalytic Heterojunction Semiconductors

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

Advanced Protection Against Marine Biofouling Using Solar Light

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Hydrothermal Synthesis, Characterization, and Visible Light‐Driven Photocatalytic Properties of Bi2WO6 Nanoplates

Cited by 26 publications

References 32 publications

Synthesis, Analysis, and Testing of BiOBr-Bi2WO6Photocatalytic Heterojunction Semiconductors

Synthesis, Analysis, and Testing of BiOBr-Bi2WO6Photocatalytic Heterojunction Semiconductors

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

Advanced Protection Against Marine Biofouling Using Solar Light

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Product

Resources

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Hydrothermal Synthesis, Characterization, and Visible Light‐Driven Photocatalytic Properties of Bi₂WO₆ Nanoplates

Synthesis, Analysis, and Testing of BiOBr-Bi₂WO₆Photocatalytic Heterojunction Semiconductors

Synthesis, Analysis, and Testing of BiOBr-Bi₂WO₆Photocatalytic Heterojunction Semiconductors