ChemCatChem
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2018
·Vol. 10
·期 14
·3040-3048
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IF 4.674
Tingxia Hu,Haiping Li,Na Du,Wanguo Hou
Graphical Iron rules : Fe-doped Bi 2 WO 6 exhibits a much higher photoactivity than Bi 2 WO 6 because of the introduction of the dopant and defect energy levels. The metal-doping of Bi-based oxide photocatalysts to enhance the photocatalytic performance has been a research hotspot in recent years, but the research on the mechanism of doping-induced photoactivity improvement is still incomplete. To illustrate the mechanism completely and clearly, Fe-doped Bi 2 WO 6 , as an example, was synthesized by a facile hydrothermal route. Fe-doped Bi 2 WO 6 exhibits a much higher photoactivity than pure Bi 2 WO 6 in the degradation of Rhodamine B (RhB) and salicylic acid (SA). By replacing W 6+ , the Fe 3+ doping narrows the energy band gap and generates many oxygen vacancies, which can increase the adsorption of both RhB and SA, and the introduced defect and Fe-doping energy levels in the band gap of Bi 2 WO 6 increase the separation efficiency of photoinduced charge carriers significantly. These lead to the considerable photoactivity enhancement of Fe-doped Bi 2 WO 6 . The photoactivity of Fe-doped Bi 2 WO 6 is stable and superior to that of most reported modified Bi 2 WO 6 photocatalysts. This work illustrates in detail the mechanism for the photoactivity improvement of Fe-doped Bi 2 WO 6 , which benefits the research of other metal-doped photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Long Zeng,Qingyun Tian,Ting Gao,Tian Luo,Shuochen Wang,Hui Wang,Zhen-Hong He,Yu Huang,Carolina Belver,Detlef W. Bahnemann,Chuanyi Wang
The efficient conversion of NO to NO 3 - and the generation of the by-product NO 2 are considered to be highly competitive reactions during the photocatalytic conversion of low concentrations of nitrogen oxides in the ambient atmosphere. However, achieving highly selective photocatalytic conversion of NO to NO 3 - remains a great challenge in current research. In this work, we successfully prepared a bismuth tungstate (BWO-40) with a microcrystalline domain, combines amorphous and crystalline structure, co-modified by oxygen vacancies (OVs) and bismuth (Bi) dual active sites. The composite photocatalyst exhibited a remarkable photocatalytic efficiency of 73.49%, reaching more than twice the efficiency of pure Bi 2 WO 6 , BWO-0 (26.66%), for NO conversion under visible light (λ ≥ 420 nm). The photocatalytic performance of BWO-40 significantly enhanced due to the synergistic effect between Bi and OVs as well as its microcrystalline structure. This not only facilitates the utilization of solar energy but also provides additional adsorption, thus improving the activation of reactant molecules while effectively suppressing the conversion of NO into the toxic by-product NO 2 (10.82 ppb). Furthermore, in-situ DRIFTS was used to investigate the adsorption and photocatalytic conversion pathways of NO. This work provides a feasible solution for achieving the highly selective conversion from low concentration of NO to NO 3 - of about 99% and effectively inhibiting the production of NO 2 .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 38
·31744-31750
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IF 3.289
Tingxia Hu,Haiping Li,Renjie Zhang,Na Du,Wanguo Hou
Bismuth tungstate (Bi2WO6) nanosheets with dominant exposed (010) facets and various thicknesses (H) and lateral sizes were hydrothermally synthesized via pH adjustment of precursor suspensions. As the pH increases from <1 to 8, the resultant nanosheets exhibit improved crystallinity and photoabsorption, decreased specific surface area, increased H, and decreased photoactivity in the degradation of rhodamine B (RhB), methylene blue (MB), and Eosin Y (EY) under visible light irradiation. The photoactivity of the Bi2WO6 sample obtained at pH < 1 is about 6, 100, and 25 times of that at pH 8 for RhB, MB, and EY degradation, respectively. The photoactivity enhancement is ascribed to reduction of the H. The photocatalytic efficiencies are inversely proportional to the reduction of H2 when the nanosheets can be penetrated by incident light. This work reveals the structure–performance relationship of Bi2WO6 nanosheets and provides significant guidance for preparation of high efficient two-dimensional photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2017
·
IF 1.342
Jia-jia WANG,Lin TANG,Guang-ming ZENG,Yao-yu ZHOU,Yao-cheng DENG,Chang-zheng FAN,Ji-lai GONG,Ya-ni LIU
The photocatalytic degradation of norfloxacin by bismuth tungstate (Bi 2 WO 6 ) with different hierarchical architectures was investigated under visible light irradiation. Bi 2 WO 6 was prepared by hydrothermal method with the reaction solution pH ranging from 4 to11. The relatively ultrathin Bi 2 WO 6 nanoflakes prepared at pH 4 showed excellent adsorption and photodegradation efficiency towards norfloxacin. The characterization results showed that Bi 2 WO 6 prepared at pH 4 had a larger specific area and faster photo-generated carrier separation rate. The decay rate reached the maximum in weak alkaline reaction solution, which could be attributed to the presence of moderate OH − anions. The present study demonstrated that the smaller size of Bi 2 WO 6 could be an efficient photocatalyst on the degradation of norfloxacin in the aquatic environment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MATERIALS LETTERS
·
2011
·
IF 2.12
Peisong Tang,Haifeng Chen,Feng Cao
Bismuth Tungstate (Bi 2 WO 6 ) nanodisks were synthesized using Bi (NO 3 ) 3 ·5H 2 O and Na 2 WO 4 ·2H 2 O as starting materials by a one-step hydrothermal process in the presence of ethylene glycol. The prepared sample was characterized by powder X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Brunauer–Emmett–Teller (BET) measurement, Fourier transform infrared spectroscopy (FTIR) and UV–visible diffuse reflectance spectrum (DRS). The prepared Bi 2 WO 6 nanodisks consist of fine particles and possess an optical band gap of 2.76 eV. The photocatalytic experiment demonstrates that the prepared Bi 2 WO 6 nanodisks exhibit high photocatalytic activity for decomposition of Rhodamine B under visible-light, which is ascribed to the unique shaped structures as well as narrow optical band gap.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nuclear Engineering and Technology
·
2024
·
IF 2.6
Qiang Yan,Yong Li,Guowei Wang,Zhengxin Wu,Haitao Zhang,Chuyuan Mao,Zhiqiang Long,Guoqing Liu
To develop lead-free gamma-ray shielding material, bismuth tungstate (Bi 2 WO 6 ) nanocrystals were synthesized under different conditions of precursor solution by hydrothermal method and composite material based on polyurethane and bismuth tungstate nanocrystals were prepared and evaluated using gamma ray sources in this study. The effects of crystal structure and morphology on the gamma ray shielding properties of bismuth tungstate were specially investigated. Results indicated that pH value of precursors solution had significant effect on the synthesis of bismuth tungstate: orthorhombic Bi 2 WO 6 were obtained under acidic or neutral conditions while tetragonal Bi 0.875 W 0.125 O 1.6875 were obtained under strongly alkaline condition. With the increase of pH value, the morphology of bismuth tungstate changed from flower-like microspheres to persimmon-like microstructures, and then to randomly stacked nanosheets. Bismuth tungstate nanocrystals were added to polyurethane to prepare flexible gamma-ray shielding material and the gamma ray shielding properties were also tested with energy of 59.5 keV, 81.0 keV and 121.8 keV. For orthorhombic persimmon-like bismuth tungstate (Bi 2 WO 6 ) which were produced under weak acidic or neutral condition (pH = 2, 5, 7), it was found that the linear attenuation coefficient of gamma ray grew by about 8 % when pH changing from 2 to 7 for all energy tested. While for tetragonal bismuth tungstate (Bi 0.875 W 0.125 O 1.6875 ), weakly alkaline condition (pH = 9) induced significant decrease (9 %@59.5 keV, 17 %@81.0 keV and 11 %121.8 keV) of linear attenuation coefficient compared with neutral condition, which could be explained by the dramatic crystal structure change of bismuth tungstate. More alkaline synthesizing condition would make finer granularity of bismuth tungstate and the linear attenuation coefficient increased when pH change from 9 to 12. In addition, obvious differences of mechanical properties were also observed between the composites prepared using different crystalline bismuth tungstates. The results of this study provide a reference for the development of new flexible radiation shielding materials with non-toxicity, light weight and high efficiency.
研究领域:
材料科学
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辐射防护
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Xiaohong Hou,Jingjing Liu,Wei Guo,Sijia Li,Yating Guo,Yue Shi,Conglu Zhang
3D structured flower-like bismuth tungstate/magnetic-graphene nanoplates (Bi 2 WO 6 /mag-GNPs) composite was first synthetised for degradation of ciprofloxacin (CIP). The morphological properties of Bi 2 WO 6 /mag-GNPs were characterized by SEM, XRD and DRS. The results revealed the synthesized Bi 2 WO 6 /mag-GNPs had the enhanced photocatalytic activity because of the synergistic effects of Bi 2 WO 6 , graphene and Fe 3 O 4 . The photocatalytic degradation rate of Bi 2 WO 6 /mag-GNPs toward CIP was almost 6.0 times of mag-GNPs, 2.0 times and 1.7 times of Bi 2 WO 6 and Bi 2 WO 6 /GNPs, respectively. Moreover, the Bi 2 WO 6 /mag-GNPs particles could be easily separated and recycled. The construction of Bi 2 WO 6 /mag-GNPs effectively resolved the separation of photocatalyst and improved the photocatalysis activity of Bi 2 WO 6 .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Xiao Miao,Yanming Yang,Shiqi Song,Changqing Zhu,Guina Ren,Lijun Dong,Bo Ge
To meet the needs of sewage cleaning and clean drinking water , a multifunctional photothermal device is designed in this paper, which mainly includes the non-infiltrating layer of copper stearate, bismuth tungstate and copper oxide composite hydrogel. By improving the synthesis process, sheet-like copper stearate and flower-like bismuth tungstate were prepared, realizing the load of canvas, felt and fabric, with the contact angles reaching 158º, 162º and 161º, respectively. The nonwetting layer has the performance of not only selective oil removal, but also mechanical stability. Through traditional non-infiltrating materials, dyes cannot be degraded, while with the introduction of bismuth tungstate, superhydrophobic materials are given photodegradation properties, thus solving the recovery problem of powder photocatalysts . The photodegradation stability was demonstrated via multiple photodegradation processes by calculating the reaction kinetic coefficient, with a degradation efficiency of greater than 90%. The position of valence (1.9 eV) and conduction (-0.735 eV) band of bismuth tungstate was calculated based on Mott-Schottky curve, DRS and VB-XPS. With the construction of copper oxide composite hydrogel, the mechanical stability was improved and an efficiency of 1.76 kg•m −2 •h −1 was obtained. The composite hydrogel device can also be used to treat the aqueous solutions containing metal ions and dyes, which operates stably in aqueous solutions containing 3.5% NaCl without salt crystallization, thus proving the application value of the photothermal device.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Sujuan Hu,Baoling Wang,Yinhai Ma,Mengyuan Li,Liting Zhang,Zixuan Huang
In this study, ultrathin two-dimensional (2D) bismuth tungstate (Bi 2 WO 6 ) nanosheets were adopted as a Pt support for photo-assisted electrocatalytic methanol oxidation . Compared with traditional electrocatalytic reactions , the photo-assisted electrocatalytic methanol oxidation reactions of Pt-2D Bi 2 WO 6 nanosheets under simulated solar light and visible light irradiation were improved 5.1 and 2.0 times, respectively. The better photo-assisted electrocatalytic methanol oxidation activities of Pt-Bi 2 WO 6 nanosheets can be attributed to the unique 2D structure that strengthens the oxidation ability of photogenerated holes, reduces the time required for carrier migration, reduces the recombination rate of carriers and provides a larger specific surface area. Additionally, our experimental results reveal the critical factors of photo-assisted enhanced electrocatalytic activities for methanol oxidation and provide a new way to improve the photo-assisted electrocatalytic activities for methanol oxidation.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
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IF 7.267
Pan Zhang,Yuanyuan Cui,Yongji Yao,Wei Wei,Yuanyuan Sun,Kaiqiang Zhang,Yanfeng Gao
Developing cheap and efficient materials for enhancing the photochromic performance upon visible or solar light irradiation is a hot-topic in the field of solar energy conversion . However, few inorganic photochromic materials can provide satisfying applications due to their low coloring and bleaching efficiency as well as slight color change. Here, we synthesized the bismuth tungstate (Bi 2 WO 6 ) ultrathin nanosheets with the thickness of 1.29 nm via co-precipitation-hydrothermal method using cetyltrimethylammonium bromide (CTAB) surfactant . The prepared ultrathin nanosheets show the similar crystalline structure but a narrowed band gap of 2.73 eV, as compared with the 2.86 eV of pristine Bi 2 WO 6 . Additionally, the numerous [WO 6–x Br 2x ] species and abundant “Bi–O″ vacancy pairs on the surface can serve as active sites that suppress the recombination of photogenerated electron-hole pairs and capture the photogenerated electrons to form the color trapping centers. As a result, Bi 2 WO 6 ultrathin nanosheets exhibit excellent photochromic behavior upon solar light irradiation (coloring time of 5 s) and under dark atmospheric treatment (bleaching time of 35 min) compared with WO 3 -based photochromic materials (coloring time of 20–60 min and bleaching time of 3 h days).
研究领域:
材料科学
·
太阳能转换
·
纳米技术
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 20
·6045-6057
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IF 7
Fuyan Kang,Xiaona Jiang,Yao Wang,Juanna Ren,Ben Bin Xu,Guoyang Gao,Zhanhua Huang,Zhanhu Guo
Photocatalytic treatment of antibiotics in aqueous ecosystems has become a promising method. However, the low efficiency photogenerated charge separation and slow kinetics of the catalyst severely limit its deployment for industrial applications. Here, the three-dimensional bismuth tungstate (Bi2WO6)/bismuth oxyiodide (BiOI) loaded on biochar (BC/BWI) composite catalyst was designed for the efficient removal of tetracycline (adsorption capacity: 227.09 mg g−1, removal rate: 99.8%). Via construction of Z-scheme heterojunctions at the interface of Bi2WO6 and BiOI, the built-in electric field promotes the directional separation of photogenerated carriers to achieve efficient separation and utilization of photogenerated charges. Meanwhile, the introduction of electron-rich biochar (BC) effectively enhances the adsorption performance, photogenerated electron migration capacity and mass transfer process of the material. The introduction of BC and the building of Z-scheme heterojunctions effectively achieve the spatially synergistic separation of photogenerated charges. The ˙O2− dominates the photocatalytic process, according to the mechanistic studies. The degradation intermediate product testing revealed that tetracycline is efficiently degraded through two main pathways. This work provides ideas for the design of catalysts for the efficient removal of antibiotics from water bodies.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
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IF 8
Zichen Zheng,Kewei Liu,Marc Debliquy,Chao Zhang
Although semiconducting metal oxide displayed remarkable gas sensing capabilities, their path to commercialization is impeded by several challenges. A primary hurdle is the consistent response of sensing films with impervious feature under diverse detection environment. This report introduces an efficient fabrication technique that yields carbon functionalized cladding bismuth tungstate-based benzaldehyde sensors. The 3D twisted micro-flowers feature was obtained and carbon cladding was uniformly attached by a one-pot wet chemistry strategy. The C 0.75 /WO 3 /Bi 2 WO 6 sensor demonstrates superior sensing capabilities for benzaldehyde at a wide range of detection. It features a remarkable sensitivity (33.7 @ 50 ppm), swift recovery time of 49 seconds, enduring stability exceeding 15 days, and robust selectivity , all at a modest room temperature . Even in conditions of high moisture, the response value exhibited minimal degradation, decreasing by a mere 8.96% compared to its performance in the absence of ambient humidity. The complementary density functional theory calculations suggest that the C x /WO 3 /Bi 2 WO 6 exhibits a greater benzaldehyde adsorption energy and more robust anti-humidity feature compared to WO 3 /Bi 2 WO 6 , contributing to its enhanced gas-sensing efficacy.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
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