25 results on '"Yuexiang Lu"'
Search Results
2. Structural design of metal catalysts based on ZIFs: From nanoscale to atomic level
- Author
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Kangjie Zhang, Hailin Shang, Bin Li, Zhe Wang, Yuexiang Lu, and Xiangke Wang
- Subjects
single‐atom catalysts ,synthetic strategy ,ultrasmall metal nanoparticles ,zeolite imidazolate frameworks ,ZIF‐derived carbon ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract Ultrasmall metal nanoparticles (MNPs) and atomically dispersed metal sites (ADMSs) exhibit excellent catalytic activity and selectivity. However, they tend to aggregate into large particles during synthesis and catalysis due to high surface free energy. Aiming to break out of this dilemma, zeolite imidazolate frameworks (ZIFs) have proved to be ideal substrates for stabilizing the ultrafine metal nanostructures. The stabilizing mode includes confining MNPs inside their pore structures and converting intrinsic metal nodes into coordinately unsaturated metal sites (i.e., ZIF‐confined metal catalysts). Furthermore, various MNPs and ADMSs can also be immobilized into ZIF‐derived porous carbon through high‐temperature pyrolysis (i.e., ZIF‐derived carbon‐supported metal catalysts). In brief, ZIFs and their derivatives have gradually emerged as good platforms for designing metal catalysts at nanoscale and even atomic level. In this review, recent progress in the structural analysis and synthetic strategies of metal catalysts supported by ZIFs and their derivatives is presented. Besides, current challenges and future directions of atomically dispersed metal catalysts are discussed. This article will provide valuable insights into rational design of metal catalysts with exquisite nanostructure and high catalytic performance to meet further material requirements in the catalytic field.
- Published
- 2021
- Full Text
- View/download PDF
3. Graphene Oxide Membranes for Tunable Ion Sieving in Acidic Radioactive Waste
- Author
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Tong Wu, Zhe Wang, Yuexiang Lu, Shuang Liu, Hongpeng Li, Gang Ye, and Jing Chen
- Subjects
graphene oxide membrane ,ions sieving ,separation ,uranium ,Science - Abstract
Abstract Graphene oxide (GO) membranes with unique nanolayer structure have demonstrated excellent separation capability based on their size‐selective effect, but there are few reports on achieving ion–ion separation, because it is difficult to inhibit the swelling effect of GO nano sheets as well as to precisely control the interlayer spacing d to a specific value between the sizes of different metal ions. Here, selective separation of uranium from acidic radioactive waste containing multication is achieved through a precise dual‐adjustment strategy on d. It is found that GO swelling is greatly restricted in highly acidic solution due to protonation effect. Then the interlayer spacing is further precisely reduced to below the diameter of uranyl ion by increasing the oxidation degree of GO. Sieving uranyl ions from other nuclide ions is successfully realized in pH =3–3 mol L−1 nitric acid solutions.
- Published
- 2021
- Full Text
- View/download PDF
4. Immobilization mechanism of Gd2Zr2O7 ceramic for nuclear waste treatment
- Author
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Guilin Wei, Xiaoyan Shu, Mingfen Wen, Yuexiang Lu, Tao Duan, Shunzhang Chen, Hexi Tang, Jing Chen, Faqin Dong, Yi Xie, Yang He, and Xirui Lu
- Subjects
Process Chemistry and Technology ,Materials Chemistry ,Ceramics and Composites ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Published
- 2022
5. Metal-enhanced fluorescence of graphene oxide sheets
- Author
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Zhe, Wang, Liyuan, Zheng, Qi, Cheng, Xuedong, Li, Liqin, Huang, and Yuexiang, Lu
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Metals ,Graphite ,Particle Size ,Biochemistry ,Fluorescence ,Analytical Chemistry - Abstract
Graphene oxide (GO) is an excellent chemical tunable optical platform for imaging and sensing. The photoluminescence (PL) quantum yield of GO is relatively low, which limited the application of the intrinsic and tunable fluorescence from GO. Here, we report the first case of metal-enhanced fluorescence (MEF) of GO. A significant enhancement (~10-fold) in fluorescence intensity is observed from GO on the Ag substrate as compared to that on the glass. FL, Raman, and SEM images are used to investigate the MEF behavior and are coincident with each other. The influence of the metal particle size of Ag substrate is investigated. The fluorescence is also found to be responsive when adding different metal ions into GO solution. GO contacting directly with metal substrate exhibits strong MEF without quenching, which makes it possible to use GO sheets for three-dimension optical imaging and sensing.
- Published
- 2022
6. Cobalt-based zeolitic imidazole framework incorporated with well-dispersed bimetallic nanoparticles/ions as a multifunctional nanozyme for the degradation of environmental pollutants and discrimination of various phenolic substances
- Author
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Yuwei Guan, Yuexiang Lu, Jingye Zhao, Wei Huang, and Yueying Liu
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General Chemical Engineering ,Environmental Chemistry ,General Chemistry ,Industrial and Manufacturing Engineering - Published
- 2023
7. Structural design of metal catalysts based on ZIFs: From nanoscale to atomic level
- Author
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Hailin Shang, Zhe Wang, Yuexiang Lu, Kangjie Zhang, Bin Li, and Xiangke Wang
- Subjects
Materials science ,ZIF‐derived carbon ,synthetic strategy ,TA401-492 ,single‐atom catalysts ,zeolite imidazolate frameworks ,Nanotechnology ,Metal catalyst ,Materials of engineering and construction. Mechanics of materials ,Nanoscopic scale ,ultrasmall metal nanoparticles - Abstract
Ultrasmall metal nanoparticles (MNPs) and atomically dispersed metal sites (ADMSs) exhibit excellent catalytic activity and selectivity. However, they tend to aggregate into large particles during synthesis and catalysis due to high surface free energy. Aiming to break out of this dilemma, zeolite imidazolate frameworks (ZIFs) have proved to be ideal substrates for stabilizing the ultrafine metal nanostructures. The stabilizing mode includes confining MNPs inside their pore structures and converting intrinsic metal nodes into coordinately unsaturated metal sites (i.e., ZIF‐confined metal catalysts). Furthermore, various MNPs and ADMSs can also be immobilized into ZIF‐derived porous carbon through high‐temperature pyrolysis (i.e., ZIF‐derived carbon‐supported metal catalysts). In brief, ZIFs and their derivatives have gradually emerged as good platforms for designing metal catalysts at nanoscale and even atomic level. In this review, recent progress in the structural analysis and synthetic strategies of metal catalysts supported by ZIFs and their derivatives is presented. Besides, current challenges and future directions of atomically dispersed metal catalysts are discussed. This article will provide valuable insights into rational design of metal catalysts with exquisite nanostructure and high catalytic performance to meet further material requirements in the catalytic field.
- Published
- 2021
8. Carbon Emission Reduction Effect of China’s Financial Decentralization
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Fangzheng Zhu and Yuexiang Lu
- Subjects
Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,Building and Construction ,financial decentralization ,carbon emission reduction ,local government ,fiscal decentralization ,Management, Monitoring, Policy and Law - Abstract
Due to a lack of focus on China’s financial decentralization system, the existing research does not pay attention to the beneficial contribution of Chinese local governments to carbon emission reduction through their actions in the financial field. In this study, we collected 16 years of data from 30 provinces in China and utilized a two-way fixed-effects model to empirically test the impact of China’s financial decentralization on carbon emission reduction. The regression results show that China’s financial decentralization system has a significant carbon-emission reduction effect. A heterogeneity analysis shows that this effect is common in different regions of China and that fiscal decentralization will negatively moderate it. A mechanism analysis shows that under China’s financial decentralization system, the active intervention of local governments in local finance will significantly upgrade the energy consumption structure and ease the financing constraints of enterprises. The regression results of the spatial econometric model show that the carbon emission reduction effect of China’s financial decentralization still has a spatial spillover effect. Finally, we put forward corresponding policy recommendations.
- Published
- 2022
9. Application of carbon dots and their composite materials for the detection and removal of radioactive ions: A review
- Author
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Zhe Wang, Xiangke Wang, Kangjie Zhang, Jing Chen, Baowei Hu, Shuqin Wang, Yuexiang Lu, and Lingyu Zhang
- Subjects
Ions ,Strontium ,Environmental Engineering ,Materials science ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,chemistry.chemical_element ,General Medicine ,General Chemistry ,Uranium ,Electrochemistry ,Pollution ,Carbon ,Ion ,Samarium ,Adsorption ,Radioactivity ,chemistry ,Quantum Dots ,Environmental Chemistry ,Humans ,Composite material ,Europium - Abstract
Radioactive ions with high-heat release or long half-life could cause long-term influence on environment and they might enter the food chain to damage human body for their toxicity and radioactivity. It is of great importance to develop methods and materials to detect and remove radioactive ions. Carbon dots and their composite materials has been applied widely in many fields due to their plentiful raw materials, facile synthesis and functional process, unique optical property and abundant functional groups. This comprehensive review focuses on the preparation of CDs and composite materials for the detection and adsorption of radioactive ions. Firstly, the recent-developed synthetic methods for CDs were summarized briefly, including hydrothermal/solvothermal, microwave, electrochemistry, microplasma, chemical oxidation methods, focusing on the influence of CDs properties. Secondly, the synthetic methods for CDs composite materials were classified to four categories and summarized generally. Thirdly, the application of CDs for radioactive ions detection and adsorption were explored and concluded including uranium, iodine, europium, strontium, samarium et al. Finally, the detection and adsorption mechanism for radioactive ions were searched and the perspective and outlook of CDs for detection and adsorption radioactive ions have been proposed based on our understanding.
- Published
- 2021
10. Effective management of trialkyl phosphine oxides waste via Gd2Zr2O7 ceramic
- Author
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Guilin Wei, Xiaoyan Shu, Mingfen Wen, Fen Luo, Yuexiang Lu, Jing Chen, Xirui Lu, Lingshuang Li, and Faqin Dong
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Renewable Energy, Sustainability and the Environment ,Strategy and Management ,Building and Construction ,Industrial and Manufacturing Engineering ,General Environmental Science - Published
- 2022
11. Heteroatom‐Doped Carbon Dots (CDs) as a Class of Metal‐Free Photocatalysts for PET‐RAFT Polymerization under Visible Light and Sunlight
- Author
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Jingjie Jiang, Yuexiang Lu, Jing Chen, Krzysztof Matyjaszewski, Zhe Wang, and Gang Ye
- Subjects
Materials science ,010405 organic chemistry ,Heteroatom ,Dispersity ,Radical polymerization ,technology, industry, and agriculture ,General Medicine ,02 engineering and technology ,General Chemistry ,Raft ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Catalysis ,Photoinduced electron transfer ,0104 chemical sciences ,chemistry.chemical_compound ,Monomer ,chemistry ,Polymerization ,lipids (amino acids, peptides, and proteins) ,Reversible addition−fragmentation chain-transfer polymerization ,0210 nano-technology - Abstract
A key challenge of photoregulated living radical polymerization is developing efficient and robust photocatalysts. Now carbon dots (CDs) have been exploited for the first time as metal-free photocatalysts for visible-light-regulated reversible addition-fragmentation chain-transfer (RAFT) polymerization. Screening of diverse heteroatom-doped CDs suggested that the P- and S-doped CDs were effective photocatalysts for RAFT polymerization under mild visible light following a photoinduced electron transfer (PET) involved oxidative quenching mechanism. PET-RAFT polymerization of various monomers with temporal control, narrow dispersity (Đ≈1.04), and chain-end fidelity was achieved. Besides, it was demonstrated that the CD-catalyzed PET-RAFT polymerization was effectively performed under natural solar irradiation.
- Published
- 2018
12. Microplasma electrochemistry controlled rapid preparation of fluorescent polydopamine nanoparticles and their application in uranium detection
- Author
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Gang Ye, Chao Xu, Taoxiang Sun, Guoyu Wei, Yuexiang Lu, Jing Chen, and Zhe Wang
- Subjects
Detection limit ,Materials science ,Microplasma ,General Chemical Engineering ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Fluorescence ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,Anode ,Polymerization ,Environmental Chemistry ,0210 nano-technology ,Biosensor - Abstract
Fluorescent polydopamine nanoparticles (FPD) are a kind of promising fluorescent nanoparticles for biosensing and imaging, while the rapid and controllable synthesis of FPD is still challenging. In this paper, we developed a microplasma electrochemistry strategy to regulate the oxidative polymerization process of dopamine, resulting in a controlled formation of FPD. Treating the dopamine solution with microplasma anode could not only generate oxidative species to trigger the nucleation of polydopamine nanoparticles at the plasma-liquid interface, but also provide an acidic environment to inhibit their further growing up during the diffusion process. Thus, uniform FPD with a diameter of 3.1 nm could be prepared within minutes. And, continuous generation of FPD could be achieved without the formation of aggregates when prolonging the reaction time. The obtained FPD had abundant functional groups on the surfaces, showing tunable fluorescent emission properties. These luminescent nanoparticles were demonstrated for highly selective detection of uranium with a detection limit of 2.1 mg/L. The novel microplasma electrochemistry strategy established in this work provided better opportunity for controllable synthesis of FPD, as well as other luminescent nanoparticles, and broadened their application in chemical sensing area.
- Published
- 2018
13. Multidimensional colorimetric sensor array for discrimination of proteins
- Author
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Sichun Zhang, Yuexiang Lu, Jiaoe Yang, Ning Chang, Yueying Liu, and Jinpeng Mao
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Analyte ,Protein Array Analysis ,Biomedical Engineering ,Biophysics ,Metal Nanoparticles ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,Urinalysis ,010402 general chemistry ,Sensitivity and Specificity ,01 natural sciences ,Transduction (genetics) ,Sensor array ,Electrochemistry ,Humans ,Colorimetry ,Chemistry ,Proteins ,Reproducibility of Results ,DNA ,Equipment Design ,General Medicine ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Equipment Failure Analysis ,Colloidal gold ,Gold ,Naked eye ,0210 nano-technology ,Biological system ,Biotechnology - Abstract
An extensible multidimensional colorimetric sensor array for the detection of protein is developed based on DNA functionalized gold nanoparticles (DNA-AuNPs) as receptors. In the presence of different proteins, the aggregation behavior of DNA-AuNPs was regulated by the high concentrations of salt and caused different color change; while DNA-AuNPs grew induced by the reduction of HAuCl4 and NH2OH as a reductant on the surface of nanoparticles exhibited different morphologies and color appearance for different proteins. The transducers based on AuNPs modified by specific and nonspecific DNA enables naked-eye discrimination of the target analytes. This extensible sensing platform with only two receptors could simultaneously discriminate ten native proteins and their thermally denatured conformations using hierarchical cluster analysis (HCA) at the concentration of 50nM with 100% accuracy. This opens up the possibility of the sensor array to investigate the different conformational changes of biomacromolecules, and it gives a new direction of developing multidimensional transduction principles based on plasmonic nanoparticle conjugates. Furthermore, the sensing system could discriminate proteins at the concentration of 500nM in the presence of 50% human urine, which indicated this sensor array has great potential ability in analyzing real biological fluids. In addition, the multidimensional colorimetric sensor array is suitable for analysis of target analytes in the resource-restricted regions because of rapid, simple, low cost, and in-field detection with the naked eye.
- Published
- 2016
14. Localized Surface Plasmon Resonance Meets Controlled/Living Radical Polymerization: An Adaptable Strategy for Broadband Light-Regulated Macromolecular Synthesis
- Author
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Jingjie Jiang, Francesca Lorandi, Krzysztof Matyjaszewski, Tongyang Hu, Yanqi Liu, Gang Ye, Yuexiang Lu, Jing Chen, and Zeyu Liu
- Subjects
Materials science ,RAFT polymerization ,010405 organic chemistry ,Radical polymerization ,technology, industry, and agriculture ,Chain transfer ,General Chemistry ,General Medicine ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,Monomer ,chemistry ,Polymerization ,nanostructures ,Photocatalysis ,Reversible addition−fragmentation chain-transfer polymerization ,Surface plasmon resonance ,photocatalysis ,surface plasmon resonance ,Plasmon - Abstract
The photophysical process of localized surface plasmon resonance (LSPR) is, for the first time, exploited for broadband photon harvesting in photo-regulated controlled/living radical polymerization. Efficient macromolecular synthesis was achieved under illumination with light wavelengths extending from the visible to the near-infrared regions. Plasmonic Ag nanostructures were in situ generated on Ag3 PO4 photocatalysts in a reversible addition-fragmentation chain transfer (RAFT) system, thereby promoting polymerization of various monomers following a LSPR-mediated electron transfer mechanism. Owing to the LSPR-enhanced broadband photon harvesting, high monomer conversion (>99 %) was achieved under natural sunlight within 0.8 h. The deep penetration of NIR light enabled successful polymerization with reaction vessels screened by opaque barriers. Moreover, by trapping active oxygen species generated in the photocatalytic process, polymerization could be implemented without pre-deoxygenation.
- Published
- 2019
15. Microplasma Anode Meeting Molten Salt Electrochemistry: Charge Transfer and Atomic Emission Spectral Analysis
- Author
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Zhe Wang, Shuang Liu, Xuegang Liu, Yuexiang Lu, Jing Chen, Guoyu Wei, and Gang Ye
- Subjects
Electrolysis ,Glow discharge ,Chemistry ,Microplasma ,Atomic emission spectroscopy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Analytical Chemistry ,Corrosion ,law.invention ,Anode ,Chemical engineering ,law ,Molten salt ,0210 nano-technology - Abstract
Molten salt electrolysis is normally conducted with solid anode, such as noble metal or graphite, which has defects such as high cost or emission of carbon oxide. Herein, we report that a microplasma based on atmospheric-pressure glow discharge could act as a kind of gaseous anode for electrolysis in molten salt. When the Ag/Ag+ redox couple was chosen as the research object, the microplasma anode could initiate charge-transfer reactions in the molten salt and Ag could be electrodeposited with current efficiency of above 90%. The microplasma anode has also shown excellent anticorrosive performance in both chloride and carbonate molten salt. Furthermore, the microplasma anode could potentially serve as an excitation source of atomic emission spectrometry (AES), making it possible to determine the concentration of Ag ions in the molten salt in situ and in real-time. With properties such as being carbon-free and having corrosion resistance and extensive utilization for analysis, the microplasma anode has ope...
- Published
- 2018
16. Graphene Oxide Membranes for Tunable Ion Sieving in Acidic Radioactive Waste
- Author
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Hongpeng Li, Tong Wu, Yuexiang Lu, Shuang Liu, Gang Ye, Jing Chen, and Zhe Wang
- Subjects
separation ,Materials science ,General Chemical Engineering ,Metal ions in aqueous solution ,Oxide ,General Physics and Astronomy ,Medicine (miscellaneous) ,Protonation ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,Ion ,law.invention ,uranium ,chemistry.chemical_compound ,Nitric acid ,law ,General Materials Science ,lcsh:Science ,graphene oxide membrane ,Full Paper ,Graphene ,ions sieving ,General Engineering ,Full Papers ,021001 nanoscience & nanotechnology ,Uranyl ,0104 chemical sciences ,Membrane ,chemistry ,Chemical engineering ,lcsh:Q ,0210 nano-technology - Abstract
Graphene oxide (GO) membranes with unique nanolayer structure have demonstrated excellent separation capability based on their size‐selective effect, but there are few reports on achieving ion–ion separation, because it is difficult to inhibit the swelling effect of GO nano sheets as well as to precisely control the interlayer spacing d to a specific value between the sizes of different metal ions. Here, selective separation of uranium from acidic radioactive waste containing multication is achieved through a precise dual‐adjustment strategy on d. It is found that GO swelling is greatly restricted in highly acidic solution due to protonation effect. Then the interlayer spacing is further precisely reduced to below the diameter of uranyl ion by increasing the oxidation degree of GO. Sieving uranyl ions from other nuclide ions is successfully realized in pH =3–3 mol L−1 nitric acid solutions., Precisely controlling the interlayer spacing of graphene oxide (GO) membrane in a wide range (11.4–15.5 Å) is realized by using a dual‐adjustment strategy of combining acidity with oxidation degree. Such GO membranes can successfully sieve uranyl ions from other nuclide ions in pH =3–3 mol L−1 HNO3 aqueous, showing their potential application in the treatment of highly acidic radioactive waste.
- Published
- 2021
17. Graphene aerogel for photocatalysis-assist uranium elimination under visible light and air atmosphere
- Author
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Tong Wu, Shuang Liu, Gaoyang Ye, Xiangke Wang, Yuexiang Lu, Liqin Huang, Hangxi Liu, Zhe Wang, and Zhen Lei
- Subjects
Photocurrent ,Materials science ,Graphene ,General Chemical Engineering ,Nanoparticle ,chemistry.chemical_element ,Aerogel ,02 engineering and technology ,General Chemistry ,Uranium ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,Uranyl ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Photocatalysis ,Environmental Chemistry ,0210 nano-technology ,Visible spectrum - Abstract
Photocatalysis-assist transition of uranium from soluble ions to insoluble nanoparticles is benefit for the extraction of uranium but has been rarely realized under air atmosphere. Here we developed a novel graphene aerogel (GA), GA-200, for the photocatalytic removal of uranium from water under visible light and air atmosphere for the first time. By controlling the reduction degree, GA-200 remained numbers of functional groups for anchoring uranium and possessed high photocurrent response and narrow band gap to generate and transfer electrons/holes readily. Under visible light irradiation, neutral (UO2)O2·2H2O nanoparticles were formed and could evacuate from the surface of GA-200 to regenerate the active sites in-situ, resulting in a high removal capacity of 1050 mg/g. The mechanism was further studied. It was found that at the presence of O2 in air, the photochemistry property of uranyl itself played an essential role to generate H2O2 and (UO2)O2·2H2O was formed instead of UO2, which was different from that in oxygen-free atmosphere.
- Published
- 2020
18. New short-channel SBA-15 mesoporous silicas functionalized with polyazamacrocyclic ligands for selective capturing of palladium ions in HNO3 media
- Author
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Jing Chen, Xiaomei Huo, Gang Ye, Fengcheng Wu, Rong Yi, Yuexiang Lu, and Yuekun Liu
- Subjects
Ligand ,General Chemical Engineering ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Mesoporous silica ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Combinatorial chemistry ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,Cyclen ,chemistry ,X-ray photoelectron spectroscopy ,Molecule ,0210 nano-technology ,Mesoporous material ,Palladium - Abstract
In this study, a new kind of short-channel SBA-15 mesoporous silica decorated with polyazamacrocyclic ligands was developed, showing selective binding ability to palladium ions based on host–guest interaction. The established synthesis protocol involved the co-condensation synthesis of an SBA-15 precursor with halogen atoms uniformly incorporated in the mesoporous silica matrix, followed by the anchoring of 1,4,7,10-teraazacyclododecane (Cyclen) ligands via post-grafting. Due to the short straight channels and large pore size facilitating the diffusion of the molecules and ions, the mesoporous silicas were found to possess a high density of the functional Cyclen ligands, as well as high adsorption capacity of Pd(II) in HNO3 solutions. The structure and morphology of the Cyclen functionalized mesoporous silicas were fully characterized. And, the adsorption behavior toward Pd(II) was investigated combined with the theoretical interpretation of the experimental data based on typical kinetic equations, isotherm models and thermodynamic equations. Furthermore, the detailed coordination mechanism between the Cyclen ligands and Pd(II) was examined by high resolution X-ray photoelectron spectroscopy (XPS). A suggested mechanism involving the synergistic effect of four cyclic amines in the Cyclen ligands was proposed to describe the coordination to Pd(II) in HNO3 solutions. Overall, this work provides a facile and effective pathway to build polyazamacrocycle ligand decorated mesoporous silicas with short-channels and large pores, which might be potentially used for molecule recognition and selective enrichment of precious metals.
- Published
- 2016
19. Graphene aerogel capsulated precipitants for high efficiency and rapid elimination of uranium from water
- Author
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Liqin Huang, Zhe Wang, Shuang Liu, Fanyu Lin, Xiangke Wang, Tong Wu, Yuexiang Lu, Njud S. Alharbi, Huimin Hu, and Samar Rabah
- Subjects
Phytic acid ,Materials science ,Graphene ,General Chemical Engineering ,Oxide ,chemistry.chemical_element ,Hydrothermal treatment ,Aerogel ,02 engineering and technology ,General Chemistry ,Uranium ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,law.invention ,Contaminated water ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Environmental Chemistry ,Degradation (geology) ,0210 nano-technology - Abstract
Developing convenient and rapid method for eliminating uranium from massive contaminated water under emergency conditions is highly needed. Herein we developed a novel chemical precipitation strategy based on graphene aerogel capsulated with the degradation products of phytic acid (PAGA). With hydrothermal treatment, graphene oxide was twisted and reduced to generate aerogel, acting as an encapsulator. At the same time, phytic acid (PA) was degraded into various compounds and capsulated into graphene aerogel with a high loading capacity of 85 g/g. After adding PAGA into uranium contaminated water, the degradation products were released out of GA skeleton to combined with uranium and form sediments. The elimination capacity reached up to 3550 mg/g within 40 min and the obtained sediments possessed good stability in the following 72 h. PAGA capsule also presented high removal rate in various water systems, making it a kind of versatile material in the elimination of uranium under emergency conditions.
- Published
- 2020
20. Cyclodextrin functionalized 3D-graphene for the removal of Cr(VI) with the easy and rapid separation strategy
- Author
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Jing Chen, Zhe Wang, Yuexiang Lu, Liqin Huang, Maosheng Zheng, Zhili Chang, Fanyu Lin, Bing Yang, and Shuang Liu
- Subjects
Anions ,Chromium ,Materials science ,010504 meteorology & atmospheric sciences ,Health, Toxicology and Mutagenesis ,Metal ions in aqueous solution ,chemistry.chemical_element ,010501 environmental sciences ,Toxicology ,01 natural sciences ,Water Purification ,law.invention ,Metal ,Adsorption ,law ,Metals, Heavy ,Spectroscopy, Fourier Transform Infrared ,0105 earth and related environmental sciences ,Ions ,chemistry.chemical_classification ,Cyclodextrins ,Cyclodextrin ,Graphene ,beta-Cyclodextrins ,Graphene foam ,Water ,General Medicine ,Hydrogen-Ion Concentration ,Pollution ,chemistry ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Graphite ,Selectivity ,Water Pollutants, Chemical - Abstract
As a useful heavy metal ion, chromium has seen its applications in various fields. While it is also a toxic contaminant in water and may cause serious threats to the environment and human health. To develop a novel material with good adsorption capacity and easy solid-liquid separation strategy was necessary and significant. In this paper, the β-cyclodextrin (β-CD) functionalized three-dimensional structured graphene foam (CDGF) was successfully synthesized with the facile and one-step hydrothermal method. The SEM, BET, XRD, FT-IR and XPS analysis were carried out and the results confirmed the successfully grafting of β-CD onto GF. The batch adsorption of Cr(VI) was also taken out and the CDGF possessed good selectivity compared with other metal ions at pH = 3. The adsorption capacity reduced gradually as the initial pH of the Cr(VI) solution grew higher, which was because the anionic species of Cr(VI) were partial to the positively charged surface of CDGF. The easy separation strategy of the CDGF was also demonstrated and the CDGF could be taken out easily with a tweezer after the adsorption of Cr(VI), which significantly simplified the separation procedure and reduced time. By comparing the FT-IR and XPD analysis results, the adsorption mechanism was explored and the hydroxyl groups on CDGF played the main role in the adsorption process. This work brings a novel material for the adsorption of Cr(VI) from water and provides an innovative direction for the easy and fast solid-liquid separation strategy in the adsorption and other application fields.
- Published
- 2019
21. Atmospheric-pressure microplasma as anode for rapid and simple electrochemical deposition of copper and cuprous oxide nanostructures
- Author
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Zhonghua Ren, Bo Yu, Yuexiang Lu, Jing Chen, Zhe Wang, and Hang Yuan
- Subjects
Glow discharge ,Materials science ,Microplasma ,General Chemical Engineering ,Inorganic chemistry ,Oxide ,General Chemistry ,Electrochemistry ,Cathode ,law.invention ,Anode ,Nanomaterials ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,law ,Electrode - Abstract
There has been growing attention on plasma electrodes, as they are much cheaper than commonly used metal electrodes such as Pt and have renewable electrode interfaces. However, most research was mainly focused on plasma cathodes, while the research and application of plasma anodes has been rarely reported. In this paper, we applied an atmospheric-pressure microplasma as a gaseous anode for transferring positive charges and inducing electrochemical reactions in solution. Cu and Cu2O nanocrystals have been co-deposited on ITO cathodes in 100 mM CuSO4 solution at room temperature. By simply changing the precursor concentration and reaction temperatures, pure Cu and Cu2O product could be prepared. Our work will expend the application area of plasma electrodes in electrochemistry and nanomaterials synthesis, and it is also a new rapid and simple electrochemical method for preparing copper and cuprous oxide nanostructures.
- Published
- 2015
22. Nano Endoscopy with Plasmon-Enhanced Fluorescence for Sensitive Sensing Inside Ultrasmall Volume Samples
- Author
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Hang Yuan, Zhe Wang, Gang Ye, Xinrong Zhang, Yuexiang Lu, Tianhao Wu, Jing Chen, Jie Liu, Guoyu Wei, and Sichun Zhang
- Subjects
Nanowire ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,Substrate (electronics) ,Tungsten ,010402 general chemistry ,01 natural sciences ,Fluorescence ,Analytical Chemistry ,Nano ,Animals ,Image resolution ,Plasmon ,Fluorescent Dyes ,Nanoporous ,Chemistry ,Nanowires ,technology, industry, and agriculture ,Endoscopy ,Equipment Design ,Aptamers, Nucleotide ,Carbocyanines ,Surface Plasmon Resonance ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Muramidase ,Gold ,0210 nano-technology ,Chickens ,Porosity - Abstract
Plasmon-enhanced fluorescence (PEF) generally requires the samples settled on a metal substrate and the effective enhancement distance is less than 100 nm, which limit its application in intracellular sensing. Herein, we report a nano endoscopy with PEF effect for sensing analytes inside the extremely small volume samples. The nano endoscopy was fabricated by assembling single nanoporous gold nanowire (PGNW) on the tip of a tungsten needle. It was accurately manipulated to insert into a micro droplet, and an effective sensing was realized at micrometre scale with submicrometer resolution. By taking lysozyme as a model sensing target, a 23-fold improvement of sensitivity was obtained, comparing with that of smooth gold nanowire (SGNW). These results indicated that the nano endoscopy can realize a high spatial resolution sensing, showing its potential application in intracellular sensing.
- Published
- 2017
23. Browning of Mammary Fat Suppresses Pubertal Mammary Gland Development of Mice via Elevation of Serum Phosphatidylcholine and Inhibition of PI3K/Akt Pathway
- Author
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Limin Lang, Jisong Zheng, Shuyi Liang, Fenglin Zhang, Yiming Fu, Kaixin Deng, Fan Li, Xiaohua Yang, Junfeng Wang, Yuexiang Luo, Shilei Zhang, Xiaotong Zhu, Lina Wang, Ping Gao, Canjun Zhu, Gang Shu, Qianyun Xi, Yongliang Zhang, Qingyan Jiang, and Songbo Wang
- Subjects
browning of mammary fat ,mammary gland development ,phosphatidylcholine ,proliferation ,PI3K/Akt pathway ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
Mammary fat plays a profound role in the postnatal development of mammary glands. However, the specific types (white, brown, or beige) of adipocytes in mammary fat and their potential regulatory effects on modulating mammary gland development remain poorly understood. This study aimed to investigate the role of the browning of mammary fat on pubertal mammary gland development and explore the underlying mechanisms. Thus, the mammary gland development and the serum lipid profile were evaluated in mice treated with CL316243, a β3-adrenoceptor agonist, to induce mammary fat browning. In addition, the proliferation of HC11 cells co-cultured with brown adipocytes or treated with the altered serum lipid metabolite was determined. Our results showed that the browning of mammary fat by injection of CL316243 suppressed the pubertal development of mice mammary glands, accompanied by the significant elevation of serum dioleoylphosphocholine (DOPC). In addition, the proliferation of HC11 was repressed when co-cultured with brown adipocytes or treated with DOPC. Furthermore, DOPC suppressed the activation of the PI3K/Akt pathway, while the DOPC-inhibited HC11 proliferation was reversed by SC79, an Akt activator, suggesting the involvement of the PI3K/Akt pathway in the DOPC-inhibited proliferation of HC11. Together, the browning of mammary fat suppressed the development of the pubertal mammary gland, which was associated with the elevated serum DOPC and the inhibition of the PI3K/Akt pathway.
- Published
- 2023
- Full Text
- View/download PDF
24. Ag2Se complex nanostructures with photocatalytic activity and superhydrophobicity
- Author
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Huaqiang Cao, Yujiang Xiao, Shuisheng Wu, Baojun Li, Jiefu Yin, Yuexiang Lu, and Xiaoming Wu
- Subjects
Materials science ,Photoluminescence ,Nanostructure ,Analytical chemistry ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Contact angle ,chemistry.chemical_compound ,symbols.namesake ,Materials Science(all) ,Chemical engineering ,chemistry ,Photocatalysis ,Rhodamine B ,symbols ,General Materials Science ,Electrical and Electronic Engineering ,Photodegradation ,High-resolution transmission electron microscopy ,Raman spectroscopy - Abstract
Single-crystalline Ag2Se complex nanostructures have been synthesized via a solvothermal route in which selenophene (C4H4Se) as a selenylation source reacts with AgNO3 at a temperature of 240 °C. An orthorhombic phase β-Ag2Se nanostructure was identified by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HRTEM), and photoluminescence (PL) spectroscopy. The wettability of the as-synthesized β-Ag2Se nanostructure was studied by measurement of the water contact angle (CA). Static water CA values of over 150° were obtained, which can be attributed to the β-Ag2Se complex nanostructure having a combination of micro- and nanostructures. The superhydrophobic Ag2Se nanostructure may find applications in self-cleaning. Additionally, the photocatalytic activity of the as-synthesized β-Ag2Se nanostructure was evaluated by photodegradation of rhodamine B (RhB) dye under ultraviolet (UV) light irradiation.
- Published
- 2010
25. Ba0.6Sr0.4TiO3 Amorphous Thin Films used as Gate Dielectric in Organic Transistors
- Author
-
Guifang Dong, Yuexiang Lu, and Yong Qiu
- Abstract
not Available.
- Published
- 2008
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