JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Ruijie Chen,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic CO 2 reduction can simultaneously alleviate the energy crisis and solve environmental issues. Nevertheless, it is still challenging for designing photocatalysts with efficient carrier mobility in rational. Herein, the Bi 2 MoO 6 /g-C 3 N 4 (BMO/CN) heterostructure was constructed through a microwave-assisted which could enhance the construction of two-dimensional and two-dimensional (2D/2D) structures. The 2D/2D BMO/CN heterojunction possessed excellent charge separation efficiency which exhibited superior performance on photocatalytic CO 2 reduction. It was shown by the characterization that the (131) surface of Bi 2 MoO 6 was constructed with the (100) surface of g-C 3 N 4 . The work functions of Bi 2 MoO 6 and g-C 3 N 4 were determined to be 4.57 and 4.22 eV, respectively, which suggested the type-II heterojunction was formed. The formation of CO and CH 3 OH over the optimized BMO/CN-30% catalyst reached 2.44 and 3.61 µmol⋅g −1 ⋅h −1 , respectively. The immediate products of HCO 3 - were observed within in-situ FT-IR to further certify the evolution of CH 3 OH. This work highlighted a microwave-assisted strategy to build a heterojunction structure for enhancing photoreduction CO 2 .
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 POWER SOURCES
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2023
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IF 9.2
Dekun Shi,Zhaojun Shi,Lixin Zhang,Yaan Cao
This study presents a novel fluorine and iodine co-doped Bi 2 MoO 6 (Bi 2 MoO 6 –F–I) photocatalyst prepared using a solvothermal method . The photocatalytic performance of Bi 2 MoO 6 –F–I in N 2 photocatalytic reduction to NH 3 is considerably enhanced compared to that of pristine Bi 2 MoO 6 . The experimental findings and theoretical calculations reveal that F − substitute lattice O 2− in Bi 2 MoO 6 , creating a -Mo-F-Mo- configuration, while I − modifies the surface, forming -Bi-I species in Bi 2 MoO 6 –F–I, which serve as high-adsorption centres and active surface sites, facilitating N 2 and H 2 O molecule adsorption and activation on the surface. The synergistic effect of F − doping and -Bi-I surface species optimizes the band structure of Bi 2 MoO 6 –F–I, aligning more effectively with the redox potential of N 2 photoreduction, which consequently promotes photogenerated carrier separation and redox capability. The remarkable improvement in the photocatalytic performance of Bi 2 MoO 6 –F–I in N 2 photoreduction to NH 3 lays foundation for designing and fabricating high-performance Bi 2 MoO 6 -based 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
ACS Omega
·
2019
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IF 2.584
Junlei Zhang,Zhendong Liu,Zhen Ma
Bi2O2CO3/Bi2MoO6 heterojunction catalysts were prepared by treating Bi2MoO6 sheets with aqueous NaHCO3 solutions at room temperature. All the Bi2O2CO3/Bi2MoO6 heterojunctions exhibited higher activities than pristine Bi2MoO6 in the photocatalytic degradation of rhodamine B (RhB), methyl orange, and ciprofloxacin under visible-light irradiation, and the most active photocatalyst was found to be the one with a C/Bi molar ratio of ∼1/2.3. Relevant samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, N2 adsorption–desorption, Fourier transform infrared spectroscopy, and UV–vis spectroscopy. The higher activity of Bi2O2CO3/Bi2MoO6 than pristine Bi2MoO6 is explained by the enhanced separation and transfer of photogenerated electron/hole pairs, as verified by transient photocurrent densities, photoluminescence spectroscopy, and electrochemical impedance spectroscopy. Photogenerated holes (h+) and superoxide radical anions (•O2–) were found to be the main active species. The good reusability of Bi2O2CO3/Bi2MoO6 was testified by cycling degradation of RhB and tetracycline hydrochloride.
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
RSC Advances
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2022
·Vol. 12
·期 23
·14586-14592
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IF 4.036
Qin Li,Xueqing Jin,Meiying Yang,Qi Shen,Chunyan Sun
Debromination is a primary and critical procedure in the treatment of polybrominated diphenyl ethers (PBDEs) in the environment. Herein, oxygen vacancy-enriched Bi2MoO6 is firstly applied in the photoreduction debromination of PBDEs under visible light illumination. The introduction of oxygen vacancies not only promotes the red-shift of the light absorption band by Bi2MoO6, but also activates the C–Br bond through the formation of Br–O halogen bonds, thus realizing efficient visible light reduction of decabromodiphenyl ether (BDE209). The activation adsorption mode inferred by tracking analysis of the degradation process shows that the meta-position adsorption mode is the main adsorption configuration during the activation process, while the ortho-position adsorption mode is the most difficult. Thence, the oxygen vacancy-dominated photocatalytic BDE209 process is a position-selective multi-electron reduction process. The study shows that oxygen vacancy assisted C–Br activation is an excellent strategy for photocatalytic treatment of halogenated persistent organic pollutants.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 3
·2572-2584
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IF 2.195
Hu Fengxian,Cui Entian,Liu Hongxia,Wu Jing,Dai Yong,Yu Guiyun
Series of Bi 2 MoO 6 /NiAl-LDH hetero-junction photocatalysts were synthesized by a two-step hydrothermal method with a self-assembled process. It indicated that the in-situ intercalated NiAl-LDH showed a tight contact with Bi 2 MoO 6 layers and thus exhibited the rapid transfer of photogenerated electrons on the interface. The photocatalytic performance was evaluated by the degradation of rhodamine B (RhB) under visible light irradiation. The resulted Bi 2 MoO 6 /NiAl-LDH sample showed a higher visible-light photocatalytic activity for the degradation of RhB than any single component. The optimal LDH content in Bi 2 MoO 6 /NiAl-LDH is 15% with the degradation efficiency for more than 90% during 60 min. The excessive amount of NiAl-LDH in Bi 2 MoO 6 /NiAl-LDH could reduce the light absorption efficiency of Bi 2 MoO 6 and thus affected the generation of photoinduced electron–hole pairs. The enhanced photocatalytic activity and stability of Bi 2 MoO 6 /NiAl-LDH was attributed to the synergistic effects of the introduction of narrow band-gap NiAl-LDH and the construction of layered hetero-junction. Our synthetic method of self-assembly sheets has certain guided significance for the synthesis and application of other 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
Nanomaterials
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2023
·Vol. 13
·期 1
·214
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IF 5.3
Liyun Yan,Jiahui Tang,Qing-an Qiao,Honglan Cai,Yuqi Dong,Juan Jin,Yanbin Xu,Hongwei Gao
Bi2MoO6was one of the important bismuth-based semiconductors with a narrow bandgap, and has been widely used in selective oxidation catalysts, supercapacitors, and energy-storage devices. A series of Bi2MoO6/ZnO composite photocatalysts with different mass ratios were synthesized by the hydrothermal method. The synthesized samples were characterized by XRD, PL, UV-Vis, SEM, TEM, XPS, and BET analysis techniques. Under visible light conditions, Methylene blue (MB) was used as the target degradation product to evaluate its photocatalytic performance. The results showed that the degradation rate constant of Bi2MoO6/ZnO (0.4-BZO) was about twice that of the traditional photocatalysis of ZnO. The Bi2MoO6/ZnO composite catalyst maintained stable performance after four consecutive runs. The high photocatalytic activity of Bi2MoO6/ZnO was attributed to the efficient electron transport of the heterojunction, which accelerates the separation of electron-hole pairs and reduces the probability of carrier recombination near the Bi2MoO6/ZnO heterojunction. Bi2MoO6/ZnO nanocomposites have potential applications in the field of photodegradation.Keywords:Bi2MoO6/ZnO nanocomposites;photocatalyst;degradation
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
DALTON TRANSACTIONS
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2018
·Vol. 48
·期 3
·1067-1074
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IF 4.099
Feifei Mei,Jinfeng Zhang,Kai Dai,Guangping Zhu,Changhao Liang
Recently, cadmium selenide (CdSe) has been deeply studied because of its excellent photocatalytic hydrogen (H2) production performance. However, pure CdSe has poor stability and severe photocorrosion, which seriously affect its application prospect. In this work, we successfully deposit Bi2MoO6 on an inorganic–organic CdSe-diethylenetriamine (DETA) hybrid to design Bi2MoO6/CdSe-DETA composites by an in situ solvothermal method. The morphology, crystal structure, electrochemical properties, H2 evolution performance and the photostability of Bi2MoO6/CdSe-DETA composites are explored using various techniques. The results show that the as-prepared Bi2MoO6/CdSe-DETA composites exhibit excellent photocatalytic performance and photostability under visible light irradiation. Among them, the Bi2MoO6/CdSe-DETA hybrid system exhibits excellent photocatalytic H2 production performance (5.92 mmol g−1 h−1), which is approximately 3.6 and 1.8 times higher than that of pure CdSe and CdSe-DETA, respectively. After 4 cycles, the photocatalyst still maintains high H2 production. This study develops a new type of photocatalyst that can respond to visible light. This provides an effective way to solve the energy problem by using solar energy.
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
ChemSusChem
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2018
·Vol. 11
·期 9
·1521-1532
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IF 7.411
Yan Chen,Weiyi Yang,Shuang Gao,Linggang Zhu,Caixia Sun,Qi Li
Graphical Smaller on the inside : Internal polarization of Bi 2 MoO 6 is modulated by adjusting the solution pH during solvothermal synthesis to alter crystal lattice parameter b . DFT calculations and powder second-harmonic generation (SHG) signal measurements show that Bi 2 MoO 6 with shortened b has a larger internal polarization, which is beneficial for photogenerated charge-carrier separation efficiency to enhance photocatalytic performance. A built-in electric field from polarization inside polar photocatalysts could provide the driving force for photogenerated electrons and holes to move in opposite directions for better separation to improve their photocatalytic performance. The photocatalytic performance of a polar photocatalyst of Bi 2 MoO 6 has been enhanced through the precise control of its structure to increase internal polarization. DFT calculations predicted that a shortened crystal lattice parameter b in Bi 2 MoO 6 could induce larger internal polarization, which was achieved by the modulation of the pH of the reaction solution during a solvothermal synthetic process. A series of Bi 2 MoO 6 samples were created with reaction solutions of pH≈1, 4, and 8; the crystal lattice parameter b was found to decrease gradually with increasing solution pH. Accordingly, these Bi 2 MoO 6 samples demonstrated a gradually enhanced photocatalytic performance with decreasing crystal lattice parameter b , as demonstrated by the photocatalytic degradation of sulfamethoxazole/phenol and disinfection of Staphylococcus aureus bacteria under visible-light illumination due to improved photogenerated charge-carrier separation. This study demonstrates an innovative design strategy for materials to further enhance the photocatalytic performance of polar photocatalysts for a broad range of technical applications.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Shenman Yao,Dehua Wang,Jiahao Li,Jianxian You,Yulin Zhu,Wufei Gong,Keng Xu,Yan Liang,Yanxing Yang,Yong Yang
Crystal facets engineering emerges as a potent strategy for modulating the surface properties and gas sensing performance of semiconductor metal oxides. However, related studies have primarily focused on conventional binary metal oxides gas sensing materials, while few studies have investigated the crystal facets-dependent gas sensing activity of recently developed ternary metal oxides. Herein, the effect of crystal facets on the gas sensing activity of Aurivillius-type layered perovskite structure material Bi 2 MoO 6 was studied. It was shown that Bi 2 MoO 6 nanosheets with {001} crystal facets exhibited significantly enhanced gas sensing activity with a high response value of 72 (R a /R g ) towards 100 ppm of triethylamine at relatively low working temperature of 250 °C, which was about 10 times higher than that of Bi 2 MoO 6 nanosheets with {010} crystal facets. The gas mechanism was elucidated at the atomic and electronic levels through first principles calculation combined with experimental characterization. On the one hand, the synergistic effect of Mo/Bi bimetallic sites makes the adsorption/charge transfer between {001} facets and triethylamine much stronger. On the other hand, {001} facets have abundant chemically adsorbed oxygen and oxygen vacancy on the surface, which act as the active species in gas sensing. These results not only significantly broaden the application scope of Aurivillius-type layered perovskite structure materials in the realm of gas sensing, but also provide important guidance for the study of gas sensing mechanism in ternary metal oxides.
研究领域:
材料科学
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气体传感技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
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IF 5.116
Yuli Xiong,Lin Yang,Huichao He,Jing Wan,Peng Xiao,Wenlong Guo
The successive ionic layer absorption and reaction (SILAR) method has been successfully used for the thin film preparation of metal oxides. In this work, we firstly fabricate the hybrid Bi 2 MoO 6 @Bi 2 Mo 2 O 9 photoanode by a one-step SILAR method. The optimized Bi 2 MoO 6 @Bi 2 Mo 2 O 9 demonstrates a photocurrent about 0.160 mA cm −2 at 1.23 V vs. RHE, which is 3.6 and 8.0 times enhancement compared with pristine Bi 2 MoO 6 and Bi 2 Mo 2 O 9 for water oxidation . The enhanced efficiencies of charge separation and oxidation kinetics by Bi 2 MoO 6 @Bi 2 Mo 2 O 9 are 20.5% and 54.6% at 1.23 V vs. RHE, which is higher than Bi 2 Mo 2 O 9 (9.2% and 15.4%) and Bi 2 MoO 6 (10.7% and 29.2%). Moreover, the electron transport time of Bi 2 MoO 6 @Bi 2 Mo 2 O 9 is 0.038 ms at 300 W m −2 through the controlled intensity modulated photocurrent spectrometer analysis, which is lower than Bi 2 Mo 2 O 9 (0.087 ms) and Bi 2 MoO 6 (0.052 ms). The enhanced photoelectrochemical activities of Bi 2 MoO 6 @Bi 2 Mo 2 O 9 can be attributed to the matched energy band between Bi 2 Mo 2 O 9 and Bi 2 MoO 6 , which could not only improve the charge separation, but also accelerate the charge migration. Therefore, our research indicates an effective technique for fabricating Bi 2 MoO 6 @Bi 2 Mo 2 O 9 by one step process, and thus may provide a new idea for the preparation of other hybrid ternary metal oxides.
研究领域:
材料科学
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光化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2024
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IF 6.5
Zhenyu Liu,Min Luo,Yue Cao,Linghu Meng,Yang Yang,Xiaoman Li
Doping elements in photocatalysts is a reliable strategy for efficiently utilizing solar energy. Herein, we reported the successful synthesis of S-doped Bi 2 MoO 6 (S-BMO) through a facile one-step solvothermal method utilizing Na 2 S as a sulphur source. By systematically adjusting the doping concentration of S 2- ion, it was found that when the optimal doping amount of Na 2 S was 0.7 %, the obtained photocatalyst showed a photocatalytic nitrogen fixation rate of 122.14 μmol·h −1 ·g cat -1 under visible light irradiation for 1 h, which was 3.67 times better than Bi 2 MoO 6 (BMO). Density Functional Theory (DFT) calculations demonstrated that S partially substituted O in Bi-O-Mo in S-BMO and also modulated the electronic structure of BMO. The photoreduction ability was enhanced due to the upshift of the conduction band (CB) energy level from −0.6 to −0.72 eV after S doping. This work may provide a promising method for efficient photocatalytic nitrogen fixation by doping BMO with non-metallic elements.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Molecular Catalysis
·
2024
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IF 3.9
Jingjing Wang,Zhiwei Liu,Liying Wang,Lu Li,Qian Liu,Zhiwei Liu,Zhenzhu Cao,Yongfeng Zhang,Lin Cheng,Jucai Yang
Combining pollutant degradation with nitrogen fixation has great potential for converting wastewater into suitable irrigation water. This approach purifies water by removing pollutants and provides essential nitrogen fertilizer nutrients to crops. In our investigation, we have introduced a new composite photocatalyst made by ligand anchoring Bi source of Bi 2 MoO 6 to reform BiMOF on the surface of sea-urchin-like Bi 2 MoO 6 spheres through the use of a solvothermal method. The 3D sea urchin spheres containing Bi 2 MoO 6 @BiMOF possess a large specific surface area and close-knit interfacial contacts, enabling ample channels for carrier migration. The composite has displayed impressive proficiency in breaking down pollutants and ammonia production. The elaborate, multi-channel structure within Bi-MOF enabled efficient N 2 or organic molecule adsorption, and Bi 2 MoO 6 generated plentiful photocarriers in reaction to visible light. The diverse interface between Bi 2 MoO 6 and BiMOF guaranteed successful photocarrier separation. The addition of methylene solution increased the yield of nitrogen fixation to 3080 (μmol/L/h/g), which is 15 times higher than that achieved in pure water. As the old saying goes, ``Falling red is not an unfeeling thing, it turns into spring mud and protects the flowers even more'', here although the addition of N 2 leads to a decrease in the degradation efficiency of methylene blue (MB), the addition of methylene blue (MB) consumes more holes and thus generates more photogenerated electrons, which greatly contributes to the production of NH 4 + and thus its application in agriculture. Additionally, These valuable insights highlight the possibility of transforming contaminated water into nutrient-rich, clean irrigation water for agricultural sustainability.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）