CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Luyin Zhao,Jingmei Li,Jiayun Shao,Ling Zhang,Yuhao Ji,Xiulong Li,Dianmin Ju
The contamination of water resources in recent years has resulted in the dissemination of harmful bacteria via water sources, posing a significant threat to the safety and well-being of humans, animals, and plants. Consequently, there is a growing concern over the health and sanitation of water resources. Photocatalysis, a novel and very effective antibacterial method, has gained significant attention in the area of antibacterial research. Bismuth nitrate pentahydrate and sodium tungstate dihydrate were used in a straightforward hydrothermal process to create nanoflower spheres Bi 2 WO 6 /ZnO photocatalytic composites in molar ratios of 1:1, 1:2, 1:3, and 1:4. The first-ever demonstration of the photocatalytic broad-spectrum antibacterial activity of porous nanoflower spheres Bi 2 WO 6 /ZnO composites was shown. The samples were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and ultraviolet–visible spectroscopy (UV–vis). The antibacterial activity was evaluated using the dilution coated plate technique, with LED light irradiation. The findings indicate that the Bi 2 WO 6 /ZnO composite has a much superior antibacterial activity against both bacteria and fungus compared to individual Bi 2 WO 6 and ZnO. When exposed to LED lighting with an intensity of 35 W, the Bi 2 WO 6 /ZnO nanoparticles in a 1:2 ratio at a concentration of 1000 mg/L demonstrated complete antibacterial effectiveness against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis within 30 min. Similarly, the nanoparticles achieved 100 % antibacterial efficiency against Candida albicans within 90 min. The antibacterial efficacy of 1000 mg/L 1:2 Bi 2 WO 6 /ZnO nanoparticles against Escherichia coli and Staphylococcus aureus was found to be 100 % within 5 min under natural lighting conditions. The findings indicate that Bi 2 WO 6 /ZnO nanoparticles have excellent photocatalytic broad-spectrum antibacterial efficacy.
研究领域:
环境科学
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微生物学
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材料科学
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产品关联
DOI
高影响因子
FERROELECTRICS
·
2017
·
IF 0.551
Xiao-Juan Zhang
Bi2WO6 photocatalysts were fabricated through a hydrothermal process. The phase, microstructure and photocatalytic activity of the obtained Bi2WO6 photocatalysts were investigated. The XRD and FTIR results indicate that the fabricated Bi2WO6 have an orthorhombic phase. The SEM images demonstrate that the fabricated Bi2WO6 has a hierarchical structure. The hierarchical structure may provide Bi2WO6 microsphers with abundant mesopores and thus afford more active sites for photocatalytic reactions, which can improve the photocatalytic activity of Bi2WO6 photocatalyst. The photocatalytic activity of the fabricated Bi2WO6 was evaluated by the degradation of organic dyes under simulated light irradiation. The degradation efficiency of MO is about 92.6% when the system is irradiated by simulated light for 150 min.
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
Desalination and Water Treatment
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2024
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IF 1
Wen An,Shaomang Wang,Yang Fu,Yuan Guan,Zhongyu Li,Tao Xu,Haoran Wang
Bi 2 WO 6 nanosheets with gradient oxygen vacancies were synthesized by acetic acid solvothermal and subsequent calcination. The photocatalytic activity of the calcined Bi 2 WO 6 was significantly enhanced. The calcination regulated the oxygen vacancy in Bi 2 WO 6 . Oxygen vacancy defects helped to adjust the band structure and change the surface chemical state. At the same time, the electrons were the main charge carriers of the n-type semiconductor Bi 2 WO 6 . Part of the electrons was captured by the oxygen vacancies to promote the separation of the holes. Some of the electrons reacted with oxygen to generate • O 2 – . The h + and • O 2 – were the main active species that degraded rhodamine B. Among them, Bi 2 WO 6 with 1 h of calcination at 315°C (Bi 2 WO 6 -315°C 1 h) exhibited the optimal photocatalytic activity. The degradation velocity of rhodamine B over Bi 2 WO 6 was 21.4 times that of Bi 2 WO 6 under the same reaction condition.
研究领域:
材料科学
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化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 28
·期 16
·12320-12325
·
IF 2.019
Li Gang
Bi 2 WO 6 nanofibers were synthesized by an electrospinning process. The phase, microstructure and photocatalytic performance of the obtained Bi 2 WO 6 photocatalysts were investigated. The XRD patterns and FTIR spectrum suggest that Bi 2 WO 6 nanofibers have the orthorhombic phase. The SEM and TEM images show that Bi 2 WO 6 nanofibers have a rough surface and a large number of hollow caves. The Bi 2 WO 6 hierarchical nanofibers show a high decomposition efficiency of MO under light irradiation. The higher photocatalytic activity of Bi 2 WO 6 nanofibers results from the large specific surface area. The large specific surface area provides more surface active sits and makes an easier charge carrier transport.
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
ENVIRONMENTAL POLLUTION
·
2024
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IF 7.6
Xiaoman Yu,Menglin Liu,Haiming Xu,Jian Xu,Jiarui Yi
Enhancing adsorption ability of photocatalyst by vacancy is a fascinating strategy. Thus, Bi 2 WO 6 /BiOCl with millefeuille-like was successfully prepared via multi-pots method. Experimental results discern that BOW-10 can degraded 75.19% doxycycline hydrochloride (DOC, 20 mg/L) in 1 h, which is 1.3 and 3.5-fold larger than Bi 2 WO 6 and BiOCl, respectively. The mechanism revealed that OVs (oxygen vacancies) not only promote the adsorption of DOC and O 2 but also augment the activation ability of molecular oxygen. Therefore, photo-induced electrons can rapidly transfer from BiOCl to Bi 2 WO 6 via carrier transport channels formed by interface oxygen vacancies (IOVs) under interfacial electric field (IEF) to reduce the adsorbed O 2 . Finally, DOC was eliminated by O 2 ˙ - and h + . Moreover, the relationship of surface areas, OVs concentration and the separation efficiency of photo-generated carriers was constructed. Meanwhile, the degradation paths of DOC and the toxicity of the intermediates were comprehensively investigated through DFT theoretical calculation. This research provides an innovation approach to regulate the capability of pollution adsorption and molecular oxygen activation by vacancy engineering and heterostructure engineering.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
You Wang,Zhongke Dai,Jiajia Wang,Du Zhang,Fa Zhou,Jiawei Li,Jianhan Huang
Combining inorganic semiconductors with covalent organic frameworks (COFs) to construct excellent hybrid materials is a promising strategy for solar-driven CO 2 reduction, but how to modulate the charge migration to achieve optimal catalytic efficiency remains a great challenge. Herein, we successfully fabricated well-defined core–shell structured HBWO@Br-COFs hybrid materials using the nano-flowered Bi 2 WO 6 (HBWO) as the core and the triazine-based imine-functionalized Br-COF as the shell. The electrostatic attraction between HBWO and Br-COF leads to the formation of C-O covalent bond and a tight and stable interface. Impressively, the Scheme-II heterojunction was favorably formed at the interfacial layer between the core and the shell, and they provided a stable platform for the rapid transfer of the photogenerated charge and efficient separation of the electron-hole pairs, resulting in excellent photocatalytic CO 2 reduction. The resultant HBWO@Br-COF-2 exhibited high CO yield rate of 19.9 μmol·g −1 ·h −1 , about 3.4 times higher than HBWO (5.8 μmol·g −1 ·h −1 ) and 2.6 times greater than Br-COF (7.53 μmol·g −1 ·h −1 ), respectively. This work provides helpful ideas for the optional design and facile fabrication of the novel inorganic–organic hybrid materials for photocatalytic CO 2 reduction.
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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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lulu Zhao,Huilin Hou,Lin Wang,Chris R. Bowen,Jinguo Wang,Ruifang Yan,Xiaoqiang Zhan,Hongli Yang,Man Yang,Weiyou Yang
Creating useful chemicals based on artificial CO 2 photoreduction is considered to be an attractive approach to address the environmental and energy crises. Currently, its selectivity with high conversion efficiency is still a grand challenge. Here, we report the refined substitution of Bi 3+ with Ag + in ultrathin Bi 2 WO 6 nanosheets through a liquid-phase cation exchange process, favoring a high selectivity towards the photocatalytic production of CO from CO 2 . The incorporation of Ag + could not only significantly promote the adsorption of both CO 2 and H 2 O molecules, but also facilitate the transfer of photogenerated carriers. The as-fabricated photocatalyst achieves a high CO generation rate of 116.96 μmol g −1 with a superb selectivity of 95.7 % after 6 h reaction without any sacrificial agent, approximate 4.2 times higher than that of pure Bi 2 WO 6 . The mechanism for photocatalytic CO 2 reduction is proposed, based on in-situ Fourier Transform Infrared spectrometry analyses and Density Functional Theory calculations.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2022
·Vol. 32
·期 7
·2371-2383
·
IF 3.518
Dai Xiaojun,Feng Sheng,Wu Wei,Zhou Yun,Ye Zhiwei,Wang Yang,Cao Xun
To improve the photocatalytic activity of Bi 2 WO 6 , ZIF-8 was successfully introduced with the in-situ growth for the first time. The addition of ZIF-8 effectively inhibited the recombination of photogenerated electron–hole pairs with further improved electron utilization efficiency. The superoxide anion, .O 2 − , generated, greatly improved the photocatalytic activity. The performance of Bi 2 WO 6 /ZIF-8 in the photodegradation of tetracycline (TC) was studied under different conditions, including the proportions of ZIF-8, the dosage of catalyst, and the concentration of TC. The results indicated that 10 mg of B/Z/5/1 offered the best photocatalytic activity under UV light, achieving 97.8% degradation of TC (20 mg/L) within 80 min. The measured rate constant (k) for TC degradation was almost 3 times that of pure Bi 2 WO 6 . The effects of pH, HA, and inorganic anions on the degradation of TC were also studied for the simulated real water. Further, B/Z/5/1 could be reutilized up to five cycles without reduction of the catalysis performance. Therefore, the Bi 2 WO 6 /ZIF-8 heterojunction composite material can be utilized as an efficient photocatalyst for remediation of environmental pollution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 3
·508-512
·
IF 0.886
SHENG Jia-Yi,LI Xiao-Jin,XU Yi-Ming
Bi2WO6 is reportedly active for the photocatalytic degradation of organic compounds in aerated aqueous solution, but factors influencing the photocatalytic activity of pristine Bi2WO6 have received little attention. In this study, the effect
of sintering temperature on the physical properties of flower-like Bi2WO6 was investigated. The catalyst was synthesized through the hydrothermal reaction of Na2WO4 and Bi(NO3)3 at 160 for 20 h, followed by sintering in air
at different temperatures for 3 h. Bi2WO6 samples were characterized with X-ray diffraction, scanning electron microscopy, and Raman, ultraviolet-visible diffuse reflectance, and photoluminescence spectroscopies. All samples had similar phase compositions and electronic
structures. Samples exhibited different activities for the photocatalytic degradation of phenol in aerated aqueous solution, under ultraviolet light. With increasing Bi2WO6 sintering temperature, the rate of phenol degradation first increased and then decreased. The maximum
rate of phenol degradation was observed from the catalyst sintered at 350 . Similar results were obtained when the rate of phenol degradation was normalized with the specific surface area of the catalyst, as determined by N2 adsorption. The observed sintering temperature-dependent photoactivity
of Bi2WO6 was attributed to a combination of its crystallinity, light absorption, and surface defects.
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
Lujie Ruan,Honglin Zhou,Xiangyu Li,Yuxuan Wang,Pengfei Luo,Haixuan Wang,Jiangping Ma,Chaogang Ban,Xiaoxing Wang,Jiangjie Ye,Yajie Feng,Jili Yue,Li-Yong Gan,Xiaoyuan Zhou,Ji-Yan Dai
Addressing the growing demand for clean energy necessitates innovative approaches to enhance hydrogen production efficiency. Combining photo-catalysis and piezo-catalysis offers a synergistic strategy for energy conversion, yet the limited charge transfer and separation efficiency in pure Bi 2 WO 6 hinders its catalytic performance. Herein, by adopting Ag nanoparticles deposited on Bi 2 WO 6 nanosheets (Bi 2 WO 6 –2% Ag) as a paradigm, it is demonstrated that the incorporation of Ag significantly enhances charge separation and transfer via improved piezoelectric and electronic interactions. This modification not only boosts the piezoelectric coefficient by 1.78-fold but also promotes the generation of piezo-induced and photogenerated carriers. Consequently, Bi 2 WO 6 –2% Ag achieves a hydrogen yield of 14.3 mmol·g -1 ·h -1 under piezo-catalytic conditions, a 60.7% improvement compared to pristine Bi 2 WO 6 . Under combined piezo-photo-catalytic conditions, the hydrogen yield further increases to 30.9 mmol·g -1 ·h -1 . The enhanced performance is attributed to the synergistic effects of ultrasonic vibration and ultraviolet light, which induce band bending and polarization-driven charge migration, facilitating hydrogen production. This study provides valuable insights into the integration of noble metal deposition and piezo-photo-catalysis, opening a new pathway for the design of advanced catalysts for sustainable hydrogen energy solutions.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2023
·
IF 6
Liyun Yan,Jiahui Tang,Qing-an Qiao,Yunting Wang,Honglan Cai,Juan Jin,Hongwei Gao,Yanbin Xu
With the simple perovskite structure, Bi 2 WO 6 could be utilized as a modifier to overcome the low visible light response of the wide energy band photocatalyst ZnS. Flower-like Bi 2 WO 6 was simply synthesized by hydrothermal method and Bi 2 WO 6 /ZnS heterojunction was constructed via solvothermal reaction. The results showed that ZnS nanospheres were uniformly loaded on the flower-like structure, which was well kept under low concentration loading (≤20%ωt ZnS). The degradation of MB and Rh.B under visible light was used to measure the photocatalytic activity of the photocatalysts. The degradation rates of MB and Rh.B by 20%ωt-Bi 2 WO 6 /ZnS were as high as 94.3% and 92.8%, respectively. Moreover, the degradation performance of photocatalyst still maintained 89.3% after 4 times recycling tests. The visible light absorption ability of modified ZnS was improved, and the recombination of photogenerated electrons and holes was inhibited due to the formation of heterojunction. According to the data from density functional theory calculation, the composition of the valence band and conductive band of the Bi 2 WO 6 /ZnS system has been altered. The band gap of Bi 2 WO 6 /ZnS was reduced by roughly 1.12 eV compared to that of pure ZnS, and the work function analysis were in good agreement with the experimental results. Under light stimulation, electrons were transferred from Bi 2 WO 6 to ZnS to produce superoxide radicals which played key roles in the degradation reaction of dyes.
研究领域:
材料科学
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环境科学
·
理论计算化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jing Niu,Zhelin Song,Xin Gao,Yun Ji,Yanlin Zhang
It is of great significance to achieve superior degradation of contaminants by developing efficient and stable photocatalysts . To boost the photocatalytic performance of Bi 2 WO 6 for tetracycline degradation, the Bi 2 WO 6 composites ( Bi 2 WO 6 /C@Cu 2 O) were constructed by introducing Cu 2 O coated by carbon layer (C@Cu 2 O with 5 wt% of Bi 2 WO 6 ) in this study. Bi 2 WO 6 /C@Cu 2 O presents an excellent performance on tetracycline degradation because of the generation of more active species as ∙ O 2 - and ∙ OH. Its kinetic rate constant k was 2.8 times of pure Bi 2 WO 6 and tetracycline degradation efficiency maintained outstanding stability even after 4 cycles. This benefits from the higher photogenerated charge separation and electron transfer possessed by Bi 2 WO 6 /C@Cu 2 O compared to Bi 2 WO 6 . Various intermediates of tetracycline degradation were identified and the possible degradation pathways were proposed. The tetracycline degradation by Bi 2 WO 6 /C@Cu 2 O followed a Z-scheme photocatalysis mechanism. In addition to acting as the protective layer of Cu 2 O to attenuate the photo-corrosion of Cu 2 O, the oxygen containing functional groups C O on the surface of carbon layer could provide an electron transfer channel between the interface of Bi 2 WO 6 and Cu 2 O to reduce the interfacial charge-transfer resistance and accelerate the electron transfer.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
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