Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Qiang Li,Lijie Wang,Jupu Song,Linshen Zhang,Chunfeng Shao,Hong Li,Hemin Zhang
Construction of heterojunction photocatalysts is a valid tactics to boost the photocatalytic property of catalyst. Herein, a novel S-scheme heterojunction of zero/three dimensional (0D/3D) In 2 S 3 /Bi 2 WO 6 hybrid catalyst was obtained by assembling In 2 S 3 nanoparticles on floriated shaped Bi 2 WO 6 microsphere through a simple precipitation route for the first time. The morphology, structures, composition, chemical and optical properties of the resulting materials were carefully researched through various instruments. The degradation experiments revealed that In 2 S 3 /Bi 2 WO 6 composites exhibited superior photocatalytic behavior for dyes decomposition. The optimized In 2 S 3 /Bi 2 WO 6 composite showed remarkable photocatalytic decomposition Rhodamine B (RhB) and Methylene blue (MB), 16.0 (2.68)-fold and 70.3 (1.66)-fold larger than that of pristine Bi 2 WO 6 (In 2 S 3 ), and it also possessed good stability and reusability. The largely improved photoactivity may derive from the formed S-scheme heterojunction between Bi 2 WO 6 and In 2 S 3 , which accelerated photocarriers disassociation and retained strong redox power. Liquid chromatography-mass spectrometry (LC-MS) was applied to reveal the RhB decomposition pathway. Besides, the S-scheme charge transfer mechanism was well elucidated based on in-situ X-ray photoelectron spectroscopy analysis, density functional theory calculation (DFT), and trapping experiment along with electron paramagnetic resonance (EPR) tests.
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
Chemistry-Switzerland
·
2022
·Vol. 4
·期 3
·765-775
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IF 0
Yi Zheng,Siqi Wang,Min Shu,Yi Wang,Dumeng Cao
Enhancing photocarrier separation is a key step of photocatalysis, and in situ constructed composition interface is an advanced method to achieve this aim. Therefore, we report a face-to-face Bi2WO6/BiOCl (BWOC) which was synthesized via the continuous in situ ion-exchange method. As UV light is harmful to the human body, BWOC exhibits excellent photocatalytic activity only in visible light, and this is an important feature because visible light is a human-friendly operating condition. Under 50 W visible LED lamp illumination, unexcited BiOCl (BOC) only extracts electrons of excited Bi2WO6(BWO), and holes remain on BWO, resulting in excellent photocarrier spatial separation efficiency through the face-to-face interface. This is why BWOC can be safe to use for the removal of hazardous substances. Compared with BWO and BOC, BWOC possesses 2.6 and 5.6 times higher photodegradation activity than RhB. This work provides a novel insight of efficient visible light photocatalytic system for environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
WATER AIR AND SOIL POLLUTION
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2024
·Vol. 235
·期 9
·1-11
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IF 3.8
Wei Hongyan,Li Xuejiao,Chen Lizhu,Li Shujie,Liu Hongxu,Song Tiehong
At present, the visible light (Vis) catalytic oxidation, as a wastewater treatment approach without secondary pollution, has captured the interest of many researchers. However, the efficiency of visible photocatalysis still needs to be continuously improved. In this study, a piezoelectric photocatalyst Bi 2 WO 6 (BWO) responding to both Vis and ultrasound (US) was prepared, characterized, and employed to treat Rhodamine B (RhB) in water. The removal efficiencies of RhB under different systems (Vis/BWO, US/BWO, (Vis + US)/BWO) were investigated and the reuse capacity of BWO were examined. Moreover, the piezoelectric photocatalytic mechanism of (Vis + US)/BWO system on RhB removal was analyzed. The results exhibited that the prepared Bi 2 WO 6 possessed excellent photoresponsive and piezoresponsive properties, and the removal and mineralization of RhB could reach 100% and 77.2% within 60 min, respectively. Under the combined effect of photocatalysis and piezoelectricity, the superoxide radicals, hydroxyl radicals, and photogenerated holes produced, which were responsible for the degradation of RhB in (Vis + US)/BWO system. Graphical Abstract
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
MOLECULES
·
2017
·Vol. 22
·期 5
·859
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IF 2.861
Yuxue Zhou,Pengfei Lv,Xiangdong Meng,Yanping Tang,Pingping Huang,Xiaobing Chen,Xiaoshuang Shen,Xianghua Zeng
Two-dimensional thin Bi2WO6nanoplates have been fabricated using a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. We investigated the proposed formation mechanism based on the crystalline structures of the thin Bi2WO6nanoplates. The high adsorption ability and excellent visible-light driven photocatalytic activities of the Bi2WO6nanoplates were illustrated, in view of exposed (001) facets of nanoplates possessing faster separation of photo-generated charge carriers and increased catalytically active sites. Such a cost-effective way to obtain Bi2WO6nanoplates offers new possibilities for the design of adsorptive semiconductor photocatalysts with strengthened photocatalytic activities.Keywords:Bi2WO6nanoplates;semiconductor photocatalyst;visible light-driven
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yanhui Niu,Wenshuo Zhang,Huiyun Xia,Ningning Li,Lifang Song,Xu Li,Liying Cui
As well known, the apparent structure and chemical composition of self-cleaning photocatalytic coatings are crucial for their application. In this study, C 3 N 4 with a large specific surface area was introduced into N-CQDs/Bi 2 WO 6 to construct a highly catalytic active catalyst (CBW-0.5), which continuously degraded 57.7 % of NO. A robust self-cleaning photocatalytic coating (CCBW-B) was prepared by firmly bonding CBW-0.5 to the substrate through a layered spraying process. CBW-0.5 endowed CCBW-B with high catalytic activity, maintaining a degradation rate of 64.9 % for NO, and most of the surface organic dye contamination was degraded after 36 h. Due to the appropriate arrangement of low surface energy substances and micro/nano particles on the surface, CCBW-B with a graded cross network on the surface has contact angles (CA) of 156°/145° for water/olive oil, respectively. The influence of each component of CCBW-B on its photocatalytic and liquid repellent ability was studied, and the patterns for the differences in coating performance due to the changes in surface roughness structure caused by different layer distributions was discussed. In addition, the mechanism for the excellent performance of CCBW-B was explored using SEM, specific surface area, and the theory of the generation and distribution of air pockets. Finally, the durability and self-cleaning ability of CCBW-B were tested, and the synergistic mechanism of self-cleaning and photocatalysis was also provided.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Huadong Liu,Jingliang Cheng,Hao Sun,Xiaoyu Sun
The rapid charge recombination in Bi 2 WO 6 severely limits its photocatalytic efficiency for antibiotic wastewater treatment. To address this, Eu 3+ -doped Bi 2 WO 6 was synthesized via controlled hydrothermal method, exhibiting 2.5-fold enhanced tetracycline (TC) degradation kinetics (0.05889 min −1 ) and 23 % higher efficiency than pristine Bi 2 WO 6 under visible light. Comprehensive characterization reveals three synergistic mechanisms: first, Eu 3+ incorporation induces lattice distortion and charge imbalance, generating oxygen vacancies that act as electron traps to suppress recombination; second, UV-Vis DRS shows bandgap narrowing from 2.8 to 2.3 eV enabling broader light absorption; third, electrochemical impedance spectroscopy demonstrates 3.1-fold improved charge separation efficiency. ESR and radical trapping experiments identify h + and ·O 2– as the dominant active species, with the former contributing approximately 68 % of the degradation activity according to quantitative analysis. The catalyst retains 88.57 % activity after four cycles, showing superior stability. This work provides atomic-level insights into rare-earth doping effects on charge carrier dynamics, offering a viable strategy for designing visible-light photocatalysts.
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
Journal of Physical Chemistry C
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2015
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IF 4.772
Juan Yang,Xiaohan Wang,Xiaolei Zhao,Jun Dai,Shengran Mo
In this work, the uniform B2WO6-reduced graphene oxide (BWO–RGO) nanocomposites are prepared via electrostatic self-assembly of positively charged BWO with negatively charged GO sheets and then the composited GO is reduced via the hydrothermal treatment. The close interfacial contact and strong electronic interaction between BWO and RGO are achieved by this facile and efficient self-assembly route. Photocatalytic degradation of pollutant bisphenol A, selective oxidation of benzyl alcohol, removal of heavy metal ion Cr(VI), and selective reduction of 4-nitrophenol are selected as the probe reactions to investigate the photocatalytic activities of as-obtained BWO–RGO nanocomposites. The experimental results demonstrate the photocatalytic redox activities of BWO–RGO composites are predominantly dependent on the energy levels of photoinduced electrons or holes. In particular, the upshift of the valence band and conduction band edge of catalysts induced by the electronic interaction between BWO and RGO has an inconsistent influence on the photocatalytic reduction and oxidation reactions, respectively. As a result, the photocatalytic activity of reduction reactions is significantly enhanced, owing to the synergetic effect of the upshift of conduction band edge and the improved separation of photogenerated electrons/holes, while the oxidation ability of BWO–RGO nanocomposite is improved to a slight extent compared with bare BWO. The energy levels of photogenerated carriers should be the origins accounting for the different enhancement of photocatalytic activities for the different reactions. According to the discussion, one important conclusion can be drawn, that is, the results should be analyzed on the basis of specific reactions when discussing the effect of graphene or RGO on the photocatalytic properties of semiconductor particles.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
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IF 3.014
Ai-Min Yang,Yang Han,Shan-Shan Li,Hong-Wei Xing,Yu-Hang Pan,Wei-Xing Liu
Bi 2 WO 6 nanofibers and hierarchical microspheres were synthesized by an electrospinning process and a hydrothermal method . The phase, microstructure and photocatalytic performance of the obtained Bi 2 WO 6 photocatalysts were investigated. The X-ray powder diffraction and Fourier transform infrared spectroscopy suggest that Bi 2 WO 6 nanofibers and hierarchical microspheres have the single orthorhombic phase. The scanning electron microscope and transmission electron microscope images show that Bi 2 WO 6 nanofibers are composed of nanoparticles and Bi 2 WO 6 hierarchical microspheres consist of a large number of nanosheets . The Barrett−Emmett−Teller results, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectra, emission spectra, photocurrent and electrochemical impedance spectroscopy reveal that Bi 2 WO 6 hierarchical microspheres have a higher photocatalytic activity than that of Bi 2 WO 6 nanofibers. This is confirmed by the photo decomposition of Rhodamine B under light irradiation. The Bi 2 WO 6 hierarchical microspheres show a faster and higher efficiency decomposition of Rhodamine B under light irradiation. The higher photocatalytic activity of Bi 2 WO 6 hierarchical microspheres results from the larger 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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 28
·期 23
·18145-18153
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IF 2.019
Hao Meifeng,Fa Dejuan,Qian Lihong,Miao Yuqing
By one step hydrothermal reaction, the ultrafine nanoparticles of Bi 2 WO 6 /NiWO 4 were prepared with the particle size smaller than 5 nm. They dispersed very well in solution and exhibited excellent photocatalytic efficiency for the degradation of Rhodamine under visible light, UV light and natural solar light respectively. Under visible light irradiation for 30 min, the model dye Rhodamine B (Rh B) nearly completely degraded. For natural solar light irradiation, only 10 min observed the complete degradation of Rh B. This provides new nanocomposites for efficient photo-driven degradation of organic dyes under visible or natural solar light irradiation.
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
Journal of Cleaner Production
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2020
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IF 7.246
Zihan Kang,Ni Qin,Enzhu Lin,Jiang Wu,Baowei Yuan,Dinghua Bao
The piezoelectric Bi 2 WO 6 nanosheets with in-plane spontaneous polarization were synthesized by hydrothermal method . The adsorption and piezocatalytic properties of the synthesized Bi 2 WO 6 nanosheets were investigated upon different variants including synthesis conditions, model dye species, and pH of the dye solution. The materials exhibited positive surface charge and selective adsorption ability for the anionic dye methyl orange (MO) in acidic and neutral conditions. The ultrafast removal of MO ( k obs = 0.718 ppm s −1 ) under ultrasonic vibration was mainly controlled by monolayer adsorption, which followed the pseudo-second-order adsorption kinetics and the Langmuir adsorption isotherm . To eliminate the interference of adsorption, the cationic Rhodamine B (RhB) was adopted as the target pollutant for piezocatalytic experiments. The maximum rate constant of RhB removal (3.9 × 10 −2 min −1 ) was obtained in Bi 2 WO 6 sample with the largest specific surface area of 32.8 cm 2 g −1 . The catalytic nature of the dye degradation phenomenon was confirmed by detection of free radicals and the quenching effect of radical scavengers. The present work demonstrates the potential of Bi 2 WO 6 nanosheets in piezocatalytic applications. Moreover, the synergistic effect of adsorption and piezocatalysis is valuable for in-situ regeneration of the piezoelectric adsorbents.
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
JOURNAL OF NANOPARTICLE RESEARCH
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2022
·Vol. 24
·期 12
·1-14
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IF 2.533
Ma C. Y.,Wang R. T.,Zhao G. H.,Zhang Q. Y.
The construction of matchable multi-heterojunction with appropriate morphology provides a good strategy for improving the performance of semiconductor photocatalyst in degrading organic pollutants. Herein, binary WO 3 /Bi 2 WO 6 nanosheets coupled with various contents of mesoporous anatase TiO 2 nanoparticles for constructing TiO 2 /WO 3 /Bi 2 WO 6 heterojunction composite photocatalysts are hydrothermally fabricated. The investigation on structure and properties in the TiO 2 /WO 3 /Bi 2 WO 6 ternary photocatalysts in terms of the incorporation of TiO 2 is systematically conducted by using characterization techniques. The results show that the TiO 2 /WO 3 /Bi 2 WO 6 ternary composite at the optimized Ti/W ratio of 1:2 has the highest visible light-irradiated MB degradation, which is 9.5 times and 2.8 times that of pure TiO 2 and pristine WO 3 /Bi 2 WO 6 nanosheets, respectively. The effective charge separation between TiO 2 and WO 3 /Bi 2 WO 6 has been confirmed by PL and current–voltage (I-V) characteristics. A possible mechanism is clarified through the active species trapping experiments using various scavengers, indicating that photogenerated holes and • OH radicals play a key role. The enhanced photocatalytic activity can be ascribed to the synergistic effect of the unique structure with some favorable properties, including the elevation of the separation efficiency of photoinduced electron–hole pairs at the multi-heterojunction interfaces with appropriate band structures as well as more active adsorption sites of mesoporous/nanosheet microstructure in the degradation process. This research may provide a simple method for design and preparation of novel heterojunction photocatalysts for enhanced visible light-driven photocatalytic activity. Graphical Abstract
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
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Lei Li,Jian Yang,Lei Yang,Fan Fu,Hao Xu,Ximei Fan
As one of the typical volatile organic compounds, toluene is harmful to human health and challenging to decompose effectively with traditional photocatalysts, such as TiO 2 or ZnO. Here, a trace Fe 3+ doped TiO 2 /Bi 2 WO 6 composite photocatalyst with abundant oxygen vacancies was successfully synthesized via a hydrothermal method and subsequently impregnation treatment. The Fe 3+ doped TiO 2 /Bi 2 WO 6 were optimized by adjusting the molar ration of TiO 2 and Bi 2 WO 6 , and the optimal molar ratio was found to be TiO 2 :Bi 2 WO 6 = 1:2. The obtained Fe (0.1) -TB 2 with only 0.1 wt% Fe 3+ dopant exhibited superior photocatalytic activity with over 90% toluene removal efficiency after 180 min under visible light irradiation. A series of characterizations reveal that the improved photocatalytic activity of Fe 3+ doped TiO 2 /Bi 2 WO 6 can be attributed to synergistic effects between the extension of photogenerated carrier lifetime and the increase of visible light absorption range by narrowing the energy bandgap (shortened about 0.32 eV) and the formation of oxygen vacancies. Furthermore, hydroxyl radicals and holes as the key reactive oxygen species (ROS) in the photodegradation reaction were confirmed by electron spin resonance (ESR) experiments. Therefore, introducing Fe-ions into TiO 2 /Bi 2 WO 6 photocatalysts is an effective way to enhance the photocatalytic activities, and the modified catalysts can be considered as a promising material for decomposing toluene and other VOCs.
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
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