Catalysis Science & Technology
·
2024
·Vol. 14
·期 22
·6621-6640
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IF 4.4
Bin Guan,Junyan Chen,Zhongqi Zhuang,Zhan Gao,Zeren Ma,Xuehan Hu,Chenyu Zhu,Sikai Zhao,Kaiyou Shu,Hongtao Dang,Tiankui Zhu,Zhen Huang
As a promising future energy material, g-C3N4 as a CO2 photo-thermal-reduction catalyst can effectively convert CO2 to renewable fuel, but the low yield and low product selectivity significantly limit its further development and application. Herein, Ag and Bi2MoO6 were loaded separately or together on g-C3N4 catalysts by photo-deposition and solvothermal synthesis methods, wherein the conversion efficiency of the g-C3N4 catalyst co-loaded with 0.5% Ag and 10% Bi2MoO6 was the highest (CO yield = 50.77 μmol g−1 h−1, CO selectivity = 96.98%). Characterization shows that the co-loading of Ag and Bi2MoO6 reduces the band gap of g-C3N4, improves the light absorption performance, and promotes the photoelectron transfer and CO2 adsorption, which may be attributed to the LSPR of Ag and the Z-scheme heterojunction between g-C3N4 and Bi2MoO6. The results of in situ DRIFTS and DFT calculations are consistent with the above conclusion and show that Ag loading effectively reduces the energy barrier of each intermediate state. This thesis aims to provide data support and theoretical guidance for optimal design of g-C3N4 catalysts.
研究领域:
材料科学
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催化化学
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能源科学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Chunlai Zhang,Yingdong Hao,Xingbo Wang,Deng Hu,Nannan Sun,Wei Wei
Photocatalysis is a highly promising strategy for the direct conversion of inert methane (CH4). In this study, a ZnO semiconductor with a nanorod morphology (r-ZnO) was synthesized using a template-directed hydrothermal method, which was further used to prepare nAg/r-ZnO photocatalysts through impregnation and reduction. The structure, composition, and microstructure of nAg/r-ZnO were characterized using techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and UV-visible absorption spectroscopy (UV-vis). The in-depth mechanism of the photocatalytic conversion of CH4 was revealed through electron paramagnetic resonance (EPR) and radical capture experiments. The results showed that the introduction of Ag species promoted the separation of photoinduced electron (e−) and hole (h+) pairs, which facilitated the generation of reactive oxygen species (ROS). Therefore, the performance of photocatalytic CH4 oxidation can be significantly enhanced. Interestingly, formaldehyde (HCHO) was generated as the primary product instead of low-value methanol (CH3OH). Through optimization of Ag loading and reaction conditions, an excellent oxygenate (CH3OOH, CH3OH, and HCHO) yield of 15 551.60 μmol g−1 h−1 with a high selectivity of 98.46% was achieved simultaneously, which has been rarely reported in previous studies.
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
ACS Applied Nano Materials
·
2023
·
IF 5.9
Longjun Guo,Wei Liu,Chunqing Wang
Nanoscale Ag-decorated CuO/SnO2 heterojunctions with coralloid hollow porous structure (ACSO HPs) were successfully synthesized though a hydrothermal route with electroless Ag plating followed by the calcination and acid-washing. Detailed microstructural characterizations confirmed that the hollow porous structure comprised CuO/SnO2 and Ag/SnO2 nanoheterojunctions, and the SnO2 surface was decorated primarily with nano-Ag, which was the outer layer of the structure. The ACSO HPs sensor displayed a higher response to isopropanol compared to toluene, acetone, benzene, ethanol, and methanol than other samples. For 100 ppm isopropanol, the ACSO sensor exhibited a faster response time (6 s) and a higher recovery time (34 s) than undecorated Ag samples. The improved sensing performance of ACSO samples was ascribed to the synergistic effect of the CuO/SnO2 nanoheterojunctions with the dramatic sensitization of the decorated nano-Ag, as well as the HPs.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-13
·
IF 5.3
Bi Leyao,Fu Boyan,Lin Jiahui,Wen Junsheng,Fu Jiaxing,Zou Binglin,Su Ningning,Wang Chunjie,Wang Yue
Ag-modified ZnO coral-like nanosheets were synthesized for the first time using a simple hydrothermal method. Compared to other Ag-modified ZnO sensors, the sensor with 2 wt% Ag content demonstrates excellent ethanol-sensing performance. The maximum response value of 67.42 can be achieved at the optimal operating temperature of 260 °C for 100 ppm ethanol gas, with corresponding response/recovery time of 6/75 s, respectively. This sensor also exhibits superior selectivity, reproducibility, and long-term stability. Techniques such as XRD, XPS, SEM, and TEM were employed to characterize the physicochemical properties of the gas-sensitive materials. Further research indicates that the enhanced gas-sensing properties of the composite materials can be mainly attributed to the unique coral-like nanosheet structure, the relatively high-specific surface area (9.8706 m 2 /g), and the combined effects of the Ag-ZnO heterostructure, as well as the synergistic interplay of electronic sensitization and spillover effects. This research offers valuable insights into the modification of ZnO-based gas-sensing materials with noble metals. Graphical
研究领域:
材料科学
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传感器技术
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·9200-9208
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IF 9.931
Yaozhu Wang,Xueyan Huang,Kaiqiang Wang,Lulu Zhang,Bo Wang,Zhibin Fang,Yan Zhao,Fan Gao,Ping Liu,Wenhui Feng
Ultrathin Bi12O17Cl2 nanosheets, with the thickness of 3–4 nm, were prepared by the photo-assisted Ag exfoliation method. This method not only achieves the thickness regulation, but also introduces elemental silver on the surfaces of ultrathin Bi12O17Cl2 nanosheets. The obtained ultrathin Bi12O17Cl2 nanosheets modified with Ag show enhanced visible light absorption, improved carrier generation and separation efficiency under visible light irradiation. Their photocatalytic performance for rhodamine B (RhB) degradation is 5 times higher than that of bulk Bi12O17Cl2. It is expected that the present synthetic strategy may provide a new design concept for the fabrication of ultrathin structures.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Zhaopeng Wang,Xiaoyun Ye,Long Chen,Peijin Huang,Qianting Wang,Lian Ma,Nengbin Hua,Xuehua Liu,Xueqing Xiao,Song Chen
The ZnO/Ag composite photocatalysts were prepared via the deposition of Ag on the surface of the grassy ZnO by a simple immersion reduction method. The dosage of Ag in the composites was adjusted by the concentration of Ag ions , immersion time and the content of the reducing agent. The grassy ZnO substrate presented a hexagonal wurtzite structure and a uniform dispersion. The band gap of the ZnO/Ag composites was decreased than that of grassy ZnO due to the surface plasma resonance (SPR) effect caused by Ag modification. The photocurrent response of the composites with proper amount of Ag loading was greatly improved by the SPR effect of Ag and subsequently enhanced light absorption, which resulted in the separation of electron-hole pairs in the near-surface region of the neighboring semiconductor. The ZnO/Ag composites had excellent photocatalytic efficiency in decolorization of RhB under UV irradiation.
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 HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yingqing Zhan,Ximin Chen,Ao Sun,Hongshan Jia,Yucheng Liu,Lingli Li,Yu-Hsuan Chiao,Xulin Yang,Fei Zhu
Membrane separation technology has potential for purifying emulsified oily wastewater. However, the oils, soluble organic substances, and microorganisms can cause complex membrane fouling problems, thereby reducing the separation efficiency and service life. Herein, a highly permeable and multiple-antifouling composite membrane was prepared using porous PAN fibrous mat as support backbone for the assembly of Ag-decorated Bi 2 O 3 @ 3D MXene Schottky heterojunction and hydrophilic TA as the adhesive. The unique arrangement of 3D MXene heterojunction and hydrophilic functionalization effectively broke through the limitation of separation flux and synergistically enhanced the anti-fouling performance of membrane. Such fibrous composite membrane achieved an exceedingly high permeability (2717–3328 L·m −2 ·h −1 ) for various emulsified oils, while ensuring excellent oil/water emulsion retention rate (99.59%) and good cycle stability. Meanwhile, the composite membrane displayed favorable photocatalytic degradation performance toward degrading MeB (96.1%) and antibacterial ability. Furthermore, the MD simulation and free radical trapping experiments were carried out to unravel the molecular interactions during the separation process and the photocatalytic mechanism of composite membrane, respectively. Overall, the combination of photocatalytic self-cleaning, anti-oil adhesion, and antibacterial effect renders the membrane high permeability and multiple-antifouling performance, which provides a new strategy for dealing with complex oily wastewater in petrochemical industry .
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jing Liu,Min Ma,Xin Yu,Changhui Xin,Mingxue Li,Shijie Li
Constructing S-scheme charge transfer pathways is often considered to be an efficient strategy for boosting interfacial charge separation for high-performance photocatalysis, especially for ultrawide bandgap tantalum-based semiconductors. In this work, defects-mediated S-scheme ZnS 1-x quantum dots (QDs)/Ta 2 O 5-x composites decorated with Ag were prepared by the modified solvothermal and photoreduction methods and employed for visible-light photocatalytic toxic tetracycline degradation. Compared with commercial Ta 2 O 5 , pristine Ta 2 O 5-x microspheres, and ZnS 1-x QDs , the prepared Ag/ZnS 1-x /Ta 2 O 5-x -1.0% composite showed the highest visible-light photocatalytic performance, and the corresponding reaction rate constant reached as high as approximately 0.02605 min −1 , which was 5.97 times of ZnS 1-x QDs, 2.63 times of Ta 2 O 5-x , and far better than that of commercial Ta 2 O 5 . The main reactive species, photocatalytic mechanism and degradation pathways were also studied. The highly enhanced photocatalytic performance of the Ag/ZnS 1-x quantum dots/Ta 2 O 5-x composites could be mainly attributed to the formation of Ag modified S-scheme heterostructures and highly increased surface areas. Current work indicates a high-performance tantalum-based composite for dealing with persistent organic pollutants.
研究领域:
材料科学
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环境科学
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纳米技术
·
光催化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）