Materials Today Communications
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2020
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IF 2.678
Tiantian Zhou,Haonan Zhang,Xiaoming Ma,Xin Zhang,Yuanna Zhu,Aiyu Zhang,Yongqiang Cao,Ping Yang
The AgI/Bi 2 MoO 6 /AgBi(MoO 4 ) 2 (ABM) multi-heterostructure nanosheet composite system for visible-light photocatalysis have been successfully constructed by a simple one-step calcination method. The ABM multi-heterostructure composite photocatalysts exhibited the obviously improved photocatalytic performance than the pristine Bi 2 MoO 6 , AgBi(MoO 4 ) 2 , and AgI for the degradation of both Tetracycline hydrochloride (TC) and Rhodamine B (RhB). The apparent degradation rate for the ABM sample with the highest photocatalytic activity is 5.4 (TC) and 23.4 times (RhB) that of Bi 2 MoO 6 , 4.0 (TC) and 4.9 times (RhB) that of AgBi(MoO 4 ) 2 , and 1.9 (TC) and 2.4 times (RhB) that of AgI, respectively. This ABM sample with the highest activity showed a Bi 2 MoO 6 /AgBi(MoO 4 ) 2 composite nanosheet morphology (lateral size: 1–5 u m, thickness: 90−130 nm) with a large amounts of small AgI nanocrystals (diameter: 2−25 nm) uniformly distributed on the surface of composite sheet. The outstanding performance of the ABM composite photocatalysts should be ascribed to the effective separation of photoinduced electron-hole pairs via the multi-heterostructure in ABM, the enhanced visible-light absorption, as well as the two-dimensional (2D) morphology benefitting to the exposure of plenty of surface reactive sites and significant reduction of migration distances of photogenerated carriers. It is hoped that this facile method for the fabrication of multi-heterostructure in our work could promote and inspire the other multicomponent functional nanomaterials used in the fields of not only photocatalysis, but also solar cells, sensors, catalysis, and so on, in the future.
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
CHEMICAL PHYSICS
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2020
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IF 1.771
Yuejun Li,Tieping Cao,Zemin Mei,Xiaoping Li,Dawei Sun
Among tremendous efforts for enhanced photocatalysis, construction of heterojunction has been deemed as an effective means. In comparison with type II heterojunction, type I heterojunction receives less attention due to accumulation and increased recombination of charge carriers in one side of heterojunction. Herein, we take NaBi(MoO 4 ) 2 /Bi 2 MoO 6 as an example of type I heterojunction and explore means to improve the photocatalytic performance of NaBi(MoO 4 ) 2 /Bi 2 MoO 6 heterojunction. We employ TiO 2 electrospun nanofibers as substrates and separately grow NaBi(MoO 4 ) 2 and Bi 2 MoO 6 nanostructures on the skeleton of TiO 2 . The characterization results show that TiO 2 changes type I heterojunction into multiheterojunction integrating two type II heterojunctions. Photocatalytic tests demonstrate that as-constructed multi-heterojunction is of higher activity than that of single type I or II heterojunction, respectively, where photogenerated electrons are accumulated on the surface of TiO 2 and photogenerated holes are accumulated on NaBi(MoO 4 ) 2 and Bi 2 MoO 6 , respectively. This study highlights the potential application of TiO 2 electrospun nanofibers in the construction of multiheterojunction for enhanced visible light photocatalysis.
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
ACS Catalysis
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2016
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IF 9.307
Zan Dai,Fan Qin,Huiping Zhao,Jie Ding,Yunling Liu,Rong Chen
Crystal defects have been extensively proved to have great influence on semiconductor photocatalysis. To optimize the reactivity of crystalline photocatalysts and achieve ideal solar energy conversion, crystal defect engineering has initiated a considerable interest in real catalysts. Herein, we develop a general strategy to manufacture and mediate crystal defects in the host Bi2MoO6 lattice by varying the cerium dopant content, resulting in greatly improved visible-light-driven photocatalytic performance for the degradation of highly toxic nerve agent simulants (NAS) and organic dyes, as well as bacterial photoinactivation. After careful examination of crystal defect structure and charge carrier dynamics, it was proved that Ce-doping-mediated crystal defects are crucial for controlling the photocatalytic efficiency of aurivillius Bi2MoO6. More importantly, the well-engineered crystal defects not only exert a beneficial influence on the electron dynamics and band structure but also facilitate the one-electron and two-electron reactions by introducing the Ce3+/Ce4+ and Mo4+/Mo6+ redox couples, which results in a significant enhancement in reactive oxygen species (ROS) photogeneration.
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
Nano Energy
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2023
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IF 17.6
Kailai Zhang,Xiaodong Sun,Haitang Wang,Yali Ma,Hongwei Huang,Tianyi Ma
Single component semiconductor materials with piezoelectric response can promote the activation of hydrogen ions (H + ) and the generation of hydrogen (H 2 ) under the action of mechanical force, but the high recombination rate of carriers is the major obstacle to strengthen piezocatalytic efficiency. Here, a groundbreaking Bi 2 MoO 6 -BaTiO 3 (BMO-BTO) Type-I heterojunction piezocatalyst is successfully fabricated through a solvothermal strategy, and applied for cocatalysts-free piezocatalytic H 2 production reaction. Under ultrasonic vibration, the H 2 production rate of BMO-0.1BTO heterojunction can reach up to nearly 152.57 µmol/g/h, which is approximately 9.33 and 4.47 times with respect to that of pristine BMO (16.36 µmol/g/h) and BTO (34.16 µmol/g/h) alone, respectively. Furthermore, BMO is also combined with other commonly used piezocatalysts to construct heterojunctions, and analogous marvelous piezocatalytic H 2 production performance was attained. The enhanced piezocatalytic H 2 production performance can be credited to the established built-in electric field (BIEF) in heterojunction extraordinarily suppressed the recombination rates of piezocarriers, rather than an increase in piezoelectricity, which is emphatically verified through a series of physics and chemical characterizations. This study presents an innovative paradigm for fabricating BMO-based heterojunction piezocatalyst to efficiently convert mechanical energy into chemical energy.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Haiping Li,Jingyi Liu,Wanguo Hou,Na Du,Renjie Zhang,Xutang Tao
Heterojunctions of graphitic carbon nitride (g-C 3 N 4 ) and Bi 2 MoO 6 were solvothermally synthesized and characterized by X-ray diffraction, Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM) and high resolution TEM. The photocatalytic degradation activity of the g-C 3 N 4 /Bi 2 MoO 6 composites for Rhodamine B was examined under visible light irradiation. The heterojunction composites exhibited higher photocatalytic activity than pure g-C 3 N 4 or Bi 2 MoO 6 . The photocatalytic activity of the composites increased then decreased with increasing Bi 2 MoO 6 content. The g-C 3 N 4 /Bi 2 MoO 6 heterojunction with a Bi 2 MoO 6 content of 16.1 wt.% exhibited the highest photocatalytic activity, and its photocatalytic efficiency was more than three times those of pure g-C 3 N 4 or Bi 2 MoO 6 . The enhanced photocatalytic activity of the g-C 3 N 4 /Bi 2 MoO 6 heterostructure photocatalyst was attributed predominantly to the efficient separation of photoinduced electrons and holes. The g-C 3 N 4 /Bi 2 MoO 6 heterojunction photocatalyst exhibited excellent stability and reusability. A detailed mechanism for the enhanced photocatalytic activity is discussed. Superoxide radicals were the major active species. This study provides a visible light responsive photocatalyst with potential in environmental remediation applications.
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
APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Yuying Sun,Juan Wu,Tianjin Ma,Pengchao Wang,Chunyue Cui,Dong Ma
Carbon–coated Bi 2 MoO 6 (C@BM) composites have been successfully synthesized via two–step hydrothermal method. The morphology, structure and photocatalytic performance of the composites in the degradation of Rhodamine B (Rh B) are characterized. The results show that the C@BM composites exhibit enhanced photocatalytic performance in the degradation of Rh B with maximum degradation rates of 90% (210 min) under visible light irradiation. 1.0%C@BM sample shows the highest photocatalytic activity, and the improved photocatalytic performance is mainly ascribed to the formation of Mo O C and Bi O C bonds. The bonds could promote electron transfer from Bi 2 MoO 6 to carbon layer and inhibit the recombination of electron–hole pairs with the presence of carbon layer in the composites. Moreover, the carbon layer on Bi 2 MoO 6 could enhance the absorption in the visible light region. In the photocatalytic degradation process, O 2 − and holes are the predominant active species for the decomposition of Rh B.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 1
·1-13
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IF 2.8
Yao Sheng,Wu Hao,Meng Fanming
The composite microspheres of Bi 2 MoO 6 @g-C 3 N 4 with the hollow structure were synthesized by the template method and hydrothermal method. The characterization and analysis of the experimental results showed that compared with the single component, when the content of g-C 3 N 4 in the composite was 1%, it had excellent light absorption ability and the kinetic constant of photodegradation was 0.0209 min −1 which was 3.87 and 6.53 times higher than that of g-C 3 N 4 and Bi 2 MoO 6 , respectively, greatly improving the photocatalytic performance. The improved photocatalytic performance is attributed to the construction of the hollow sphere structure and its composite forming a heterojunction, which effectively promotes electron–hole separation and transfer. The composite photocatalyst exhibited good photochemical stability in cycling tests under simulated sunlight irradiation.
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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纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Hainan Wei,Fanming Meng,Jialong Li,Wenqing Yu,Han Zhang
Antibiotics have gradually become a new pollutant in water, which seriously threatens human health. The development of efficient and easily recyclable photocatalysts is urgently needed to achieve water purification. Herein, a novel FeIn 2 S 4 /Bi 2 MoO 6 Z-scheme heterostructural composite is successfully synthesized by a simple heat-shrinkable polymerization solvothermal method. When the doping FeIn 2 S 4 mass fraction is 10%, the degradation rate of tetracycline hydrochloride (TCH) is the highest, reaching 83.25%, which is 1.97 and 2.38 times higher than that of pure FeIn 2 S 4 and Bi 2 MoO 6 , respectively. After five consecutive cycles, the degradation rate still reached 72.35%, which has high photocatalytic stability. Combined with energy band structure analysis, active substance capture experiments and modeling with density functional theory calculations confirm the photocatalytic mechanism of Z-scheme heterostructure. This project proposes a promising and feasible method for the preparation of Z-scheme heterostructured photocatalysts.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Kaidi Wu,Hongfeng Chai,Kaichun Xu,Marc Debliquy,Chao Zhang
High working temperature and the insufficient limits of detection limit the broad applications of semiconductor chemiresistive gas sensors. Herein, pure Bi 2 MoO 6 nanosheets and a series of one-dimensional/two-dimensional (1D/2D) multi-walled CNTs/Bi 2 MoO 6 nanocomposites were developed via a facile hydrothermal route for room-temperature ammonia monitoring. The as-synthesized samples were characterized by various analytical techniques. 0.5 wt% MWCNTs/Bi 2 MoO 6 nanocomposites showed the best sensing properties to 10–50 ppm NH 3 , including low limit of detection (157 ppb), high response (R a /R g = 44.2 @ 50 ppm), good selectivity, reproductivity, and anti-humidity sensing ability. The enhanced gas sensing mechanism was proposed based on the synergetic effect of high-energy crystal facets, modified surface characteristics and p-n heterojunction . Density functional theory (DFT) studies were also carried out to further clarify the gas sensing mechanisms. This work provides a practical approach to design and fabricate high-precision gas sensors working at room temperature .
研究领域:
材料科学
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传感器技术
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Dan Xu,Hong Yan,Fen Li,Yuchen Lin,Yuanbo Zhang,Cailian Yu
This study used alkaline lignin as the carbon source for preparing alkaline lignin carbon quantum dots (LCQDs) based on the solvothermal method . To achieve efficient photocatalytic degradation of tetracyclic hydrochloride antibiotics (TCH), hydrangea-shaped LCQDs/Bi 2 MoO 6 composites were prepared in situ by the solvothermal method exploiting the optical properties of LCQDs. The composite material was systematically characterized using XRD , FTIR , XPS , SEM, TEM , EIS , nitrogen adsorption-desorption testing, and UV–vis DRS to determine its crystal structure, microstructure, and optoelectronic properties. The results show that the sample has high purity and good crystallinity . The experiment on photocatalytic degradation further demonstrated that the LCQDs/Bi 2 MoO 6 composite material modified with LCQDs exhibited superior photocatalytic activity compared to a single Bi 2 MoO 6 . Among them, BMO/LCQDs-7 showed the best effect. After 120 min of illumination, the rate of TCH removal through photocatalysis was 98.76%, with a degradation rate constant: K = 0.026 min −1 . After five cycles, the removal rate of TCH can still be maintained at 79.35%. The photocatalytic degradation of TCH has been demonstrated through EPR and LC-MS experiments primarily caused by h + and ·O 2 - .
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1732-1741
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IF 3.174
Zhiguo Sun,Jiaming Fan,Run Feng,Menglu Wang,Yue Zhou,Li Zhang
BACKGROUND In recent years, the emission of volatile organic compounds (VOCs) from different sources has caused huge environmental problems. As a ‘green’ terminal treatment technology, photocatalytic technology is a competitive technology that has practical application prospects for the emission reduction of VOCs. The core problem of photocatalysis technology is constructing a photocatalyst with higher activity. RESULTS In this work, a new hierarchical heterostructured photocatalyst of TiO 2 /Bi/Bi 2 MoO 6 was facilely fabricated by solvothermal method with the TiO 2 nanoparticles uniformly distributed on the surface of flower-like Bi 2 MoO 6 nanospheres. Compared with the bare flower-like Bi 2 MoO 6 nanospheres, the band gap width of TiO 2 /Bi/Bi 2 MoO 6 is wider, which helps to improve the Fermi level-derived oxidation–reduction capacity of the catalyst. N 2 adsorption–desorption experiments show that the composite material has a larger specific surface area, which is beneficial to improve the mass transfer efficiency in the gas–solid heterogeneous reaction. Photocatalytic data display that, under irradiation by Xenon lamp for 2 h, the degradation rate of toluene gas over TiO 2 /Bi/Bi 2 MoO 6 reached 26.08%, which is 17.92% higher than that of the bare Bi 2 MoO 6 nanospheres. CONCLUSION These results indicate that coupling TiO 2 could significantly enhance the photocatalytic degradation effect of toluene over the hierarchical heterostructured TiO 2 /Bi/Bi 2 MoO 6 , and this has practical application prospects for the use of photocatalytic technology to treat VOCs pollution. © 2021 Society of Chemical Industry
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Feng He,Junhuan Tang,Qianxiang Xiao,Wen He,Qixu Chen,Ziyang Chang,Chongkun Zhao,Kai Liu,Hongqing Wang
In uranium(VI) (U(VI)) photoreduction, it is still a challenge to simultaneously degrade naturally coexisting organics and explore their impact on U(VI) photoreduction. Meanwhile, how to boost the separation and transport capability of photo-induced carriers is also a hot topic of current research. In this work, an ultrathin Bi 2 WO 6 /Bi 2 MoO 6 Z-type heterojunction was developed for the simultaneous treatment of U(VI) and its co-existing organics (tannic acid (TA)). Ultrathin interface engineering increased the contact area and shortened the transmission distance of photo-induced carriers. As a result, ultrathin Bi 2 WO 6 /Bi 2 MoO 6 exhibited highly efficient U(VI) removal rate (95.8 %) and TA degradation rate (97.2 %), which were much higher than those of bulk Bi 2 WO 6 /Bi 2 MoO 6 and single ultrathin Bi 2 WO 6 . In addition, the material possessed excellent stability and recyclability. Importantly, TA not only enhanced U(VI) removal by eliminating holes, but also favored U(VI) removal by serving as a bridge to the catalyst for U(VI) adsorption. Finally, a new mechanism was proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）