Controllable synthesis of Bi2WO6 nanoplate self-assembled hierarchical erythrocyte microspheres via a one-pot hydrothermal reaction with enhanced visible light photocatalytic activity

Yang, Zhenya; Huang, Lin; Xie, Yanyu; Lin, Zheguan; Fan, Yunyan; Liú, Dan; Chen, Lu; Zhang, Zizhong; Wang, Xuxu

doi:10.1016/j.apsusc.2017.01.187

Cited by 50 publications

(14 citation statements)

References 44 publications

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“…The calculated band gaps are 2.66 and 2.68 eV in the case of 1 and 2 , respectively, but for 3 , it is only 2.59 eV (Figure 9). These values are otherwise in good agreement with the values reported in the literature (2.59 and 2.81 eV) [28,31,33,34,70], and make the prepared Bi 2 WO 6 samples promising candidates in the field of photocatalysis. They show a slight temperature-dependent tendency, as the smallest band gap belongs to 3 , which was prepared at the highest temperature, and thus has the most ordered structure, while 1 and 2 are more similar to each other regarding the degree of crystallinity and atomic order, and thus have a similar band gap value.…”

Section: Resultssupporting

confidence: 90%

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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Section: Resultssupporting

confidence: 90%

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

et al. 2019

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“…XPS was used to analyze elements in laminar Bi 2 WO 6 , which is shown in Figure A. The peaks of Bi 4f, W 4f, and O 1s were detected at 159.4, 35.3, and 530.0 eV, respectively, which were consistent with the reported data and proved the existence of T Bi, W, and O elements. − In addition, Figure A(a–c) shows the high-resolution Bi 4f, W 4f, and O 1s XPS spectra of laminar Bi 2 WO 6 . As shown in Figure B, the Raman analysis of laminar Bi 2 WO 6 modified on a silicon substrate was performed.…”

Section: Resultssupporting

confidence: 81%

“…The H2-SiO 2 NP conjugate was synthesized by mixing 10 μL of glutaraldehyde (0.05%), 30 μL of SiO 2 -NH 2 NPs, and 1 mL of H2 (2.5 μM) and stirring the solution for 1 h at room temperature. Finally, the obtained H2-SiO 2 NP conjugates were treated to centrifugal washing by ethanol and dispersed in 1 mL of phosphate-buffered saline (PBS) (pH 7.4) for subsequent application …”

Section: Methodssupporting

confidence: 81%

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Xia

Wang

et al. 2020

Anal. Chem.

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Herein, a novel single-enzyme-assisted dual recycle amplification strategy based on T7 exonuclease (T7 Exo) and a strand-displacement reaction (SDR) was designed to fabricate a photoelectrochemical (PEC) biosensor for sensitive microRNA-141 (miRNA-141) detection with the use of laminar bismuth tungstate (Bi2WO6) as photoactive material. Compared with a traditional enzyme-assisted dual recycle amplification strategy, the presented method could effectively refrain the enzyme interference reaction, reduce environmental sensitivity, and save cost. Here, hairpin DNA1 (H1) decorated on magnetic beads (MB) hybridized with target miRNA-141 to form an H1/miRNA-141 heteroduplex. With the introduction of hairpin DNA2 (H2)-labeled SiO2 (H2-SiO2), SDR was triggered between H2-SiO2 and H1, thus miRNA-141 was displaced from the H1/miRNA-141 heteroduplex and an H1/H2-SiO2 duplex was formed, realizing the reuse of the target. In the presence of T7 Exo, the H1/H2-SiO2 duplex was digested with the release of output DNA-SiO2. To enhance the target conversion rate, H1-MB was intactly released and cycled, which could initiate more T7 Exo digestion and free abundant output DNA-SiO2. Through such a process, a tiny miRNA-141 could induce substantial output DNA-SiO2, effectively improving the target amplification efficiency and detection sensitivity of a PEC biosensor. Furthermore, Bi2WO6 was modified on an electrode to provide a superior initial PEC signal due to its excellent electronic transformation capacity. With the introduction of output DNA-SiO2, the hairpin structure of H3 on the electrode was opened, making SiO2 close to the electrode surface, which significantly decreases the PEC signal. This work first established the PEC biosensor featuring a single-enzyme-assisted dual recycle amplification process for sensitive detection of biomarkers.

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“…However, the photogenerated charge carriers recombine easily, and thus result in a low photocatalytic efficiency. Accordingly, many methods have been used for BWO modification, such as morphology optimization [37,38,40,41], elemental doping [42,43], surface modification (e.g., with noble metals [44][45][46][47]), and the formation of heterojunctions, e.g., Bi 2 WO 6 /Zn-Al [48], Bi 2 Fe 4 O 9 /Bi 2 WO 6 [49], MoS 2 /Bi 2 WO 6 [50].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Activity of Hierarchical Bi2WO6 Microballs by Modification with Noble Metals

Wang

Zhang

et al. 2022

Catalysts

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Visible-responsive photocatalysts for environmental purification and fuel generation are, currently, highly sought after. Among the possible candidates, Bi2WO6 (BWO) has been considered due to its efficient light harvesting, stability, and promising activities. Here, hierarchical BWO microballs have been prepared using a hydrothermal method, and additionally modified with deposits of noble metals (gold, silver, copper, palladium and platinum) by the photodeposition method. The structure, morphology, photoabsorption properties, and surface composition of bare and metal-modified BWO samples were investigated by XRD, SEM, DRS and XPS analyses. The photocatalytic activity was evaluated by the oxidative degradation of model dye (methyl orange (MO)) under UV/vis, and hydrogen generation under vis and/or UV irradiation. It was found that hierarchical morphology is detrimental for high photocatalytic activity in both tested systems, resulting in the improved degradation of MO (ca. 65% during 90 min of UV/vis irradiation), and hydrogen evolution (0.1 and 0.4 μmol h−1 under vis and UV/vis irradiation, respectively). Moreover, the type of noble metal and its properties influence the overall photocatalytic performance. It was found that, under UV/vis irradiation, only platinum accelerates hydrogen evolution, whereas under vis irradiation the activity follows the order: BWO < BWO/Cu < BWO/Ag < BWO/Pt < BWO/Pd < BWO/Au. It was concluded that zero-valent metal is recommended for high vis response, probably due to plasmonic photocatalysis, efficient light harvesting ability, and co-catalytic role.

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Controllable synthesis of Bi2WO6 nanoplate self-assembled hierarchical erythrocyte microspheres via a one-pot hydrothermal reaction with enhanced visible light photocatalytic activity

Cited by 50 publications

References 44 publications

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

Effect of pH in the Hydrothermal Preparation of Bi2WO6 Nanostructures

Novel Single-Enzyme-Assisted Dual Recycle Amplification Strategy for Sensitive Photoelectrochemical MicroRNA Assay

Enhanced Photocatalytic Activity of Hierarchical Bi2WO6 Microballs by Modification with Noble Metals

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