ENERGY & FUELS
·
2019
·
IF 3.021
Jialin Meng,Yufeng Duan,Peng Hu,Yifan Xu,Xinze Geng,Ting Yao,Shaojun Ren,Hongqi Wei
A series of Mn–V–W/TiO2 (Mn–VWT) catalysts were synthesized by the impregnation method and calcinated at different temperatures (300–600 °C). To explore the effects of the reaction temperature, SO2, and H2O on the simultaneous removal performance of elemental mercury (Hg0) and NO, Mn–VWT were investigated by a fixed-bed reaction system. Various techniques (scanning electron microscopy, Brunauer–Emmett–Teller, X-ray diffraction, H2-temperature-programmed reduction, NH3-temperature-programmed desorption, and X-ray photoelectron spectroscopy) were utilized to characterize the samples. The results showed that the catalytic activity of Mn–VWT first increased and then decreased with the increasing calcination temperature. The removal efficiency of Hg0 and NO still had good performance even in low reaction temperature (200 °C), achieving 100 and 82%, respectively. Mn–VWT-400 had the best simultaneous removal performance because of the highest content of the Mn4+, V4+, and chemisorbed oxygen Oα and the best reductive activity at low temperature. Furthermore, SO2 irreversibly inhibited Hg0 and NO removal ability due to the sulfate and sulfite generation on the surface of Mn–VWT-400. Especially, the inhibition effect was more serious if SO2 and H2O coexisted because the rate of sulfate/sulfite was higher than that of the former. In addition, with the increase in reaction temperature, the effect of SO2 and H2O on the removal of Hg0 and NO over Mn–VWT was gradually reduced.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
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IF 4.6
Qunhua Zhong,Yimeng Zhou,Tianle Ren,Jianjun Zhu,Di Li,Deli Jiang
Abstract Photocatalytic CO2 reduction to carbonaceous fuels is a promising strategy to mitigate massive carbon emissions, yet the highly selective CO2 conversion remains challenging due to the unsatisfactory charge separation and limited active sites of pristine semiconductor photocatalysts. Herein, we report the in situ fabrication of oxygen vacancy rich W/H co-doped rutile TiO2 (W/H-TiO2) via a two-step wet chemical approach for high-efficiency photocatalytic CO2 reduction to CO. The optimized W/H-TiO2 exhibited high activity and selectivity for the photocatalytic reduction of CO2 to CO (57.96 μmol g–1 h–1 and 96.3%), which were significantly higher than those of other TiO2 counterparts. Experimental characterizations and density functional theory (DFT) calculations reveal that the synergistic effect of H/W co-doping accelerates the migration and separation of photogenerated charge carriers and reduces the formation energy barrier for the key *COOH intermediate, thereby markedly boosting the CO2 photoreduction activity and product selectivity of W/H-TiO2. This work establishes a dual-doping-induced oxygen vacancy strategy for electronic structure engineering, providing a new paradigm for the rational design of high-performance TiO2 based photocatalysts toward efficient CO2 photoreduction.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 5
·6133-6144
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IF 5.1
Gan Wan,Lei Han,Zongliang Xiao
In the realm of advanced luminescent materials , glass-ceramic (GC) incorporated into rare earth (RE) represents a promising candidate. However, their practical application has been constrained by limitations in luminescence efficiency and thermal stability. This study overcomes these challenges by introducing a novel Eu 3+ -doped black talc GC with enhanced optical characteristics . Our method involved fabricating a new glass matrix and incorporating heavy concentrations of Eu 3+ ions. Following a precise nucleation-crystallization process, CaMgSi 2 O 6 nanoscale crystals were uniformly dispersed within the GCs matrix, markedly enhancing its luminescent properties. When excited by 394 nm light, this GC achieved a notable internal quantum efficiency (IQE) of 88.97 %, surpassing many traditional Eu 3+ -doped glasses and GCs. Furthermore, it retained 89.6 % of its luminescence intensity even at 100 °C, indicating remarkable thermostability. To validate the GC's practical utility, we integrated this material into a white light-emitting diode (W-LED) component, incorporating a LED chip, CaMgSi 2 O 6 : Eu 3+ GC, BaMgAl 10 O 17 : Eu 2+ , and Ba 2 SiO 4 : Eu 2+ phosphor. The fabricated device demonstrated excellent chromaticity coordinates of (0.3493, 0.3935), a correlated color temperature (CCT) of 4976K, and a prominent color rendering index (CRI) of 90.3. This research not only expands the potential applications of black talc, but the prepared GCs also exhibit excellent performance in luminescence properties, highlighting the broad application of this Eu 3+ -doped GCs in W-LED lighting technology.
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高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Liangmiao Zhang,An Wang,Tianli Zhu,Zhang Chen,Yupeng Wu,Yanfeng Gao
Two types of transparent wood composites with anisotropic structure for energy-saving windows were successfully fabricated by infiltration of epoxy resin dispersion containing tungsten-doped vanadium dioxide nanoparticles (W-doped VO2 NPs) into the delignified wood template and subsequent polymerization. The well integration of the epoxy resin, W-doped VO2 NPs, and the pore-structured wood endowed the anisotropic composites with high visible transmittance (68.2% for the composite prepared from longitudinally cut trees (L-composite), 73.3% for the composite prepared from radically cut trees (R-composite)), obviously different mechanical performance (fracture stress of 74.57 MPa (L-composite) and 56.14 MPa (R-composite) and modulus of 1.47 GPa (L-composite) and 1.23 GPa (R-composite)), and low thermal conductivity (0.20 W·m–1 K–1 (L-composite) and 0.32 W·m–1 K–1 (R-composite)). Moreover, these two kinds of W/VO2 transparent wood composites both show an outstanding thermoregulation ability when they are used as windows. A significant amount of heat (from a simulated light source) was reflected by VO2 NPs, and as a result, the indoor temperature of a demo system had a significant slower temperature increase rate when compared with that for a similar system with a common glass panel applied. Novel transparent wood composites combining a low thermal conductivity wood template and thermochromic VO2 NPs provide a potential solution for replacement of heavy, high thermal conductivity, and infrared transparent glass but still meet indoor occupancy view perception.
研究领域:
材料科学
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能源效率
·
纳米复合材料
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智能窗户
·
可持续建筑材料
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Shanghua Feng,Binbin Zhao,Yu Liang,Lei Liu,Jinxiang Dong
Tungsten and aluminum were directly incorporated into SBA-15 via one-step synthesis method under an acidic medium. The W- and Al-incorporated SBA-15 was applied as support for Pt nanoparticles to catalyze glycerol hydrogenolysis toward 1,3-propanediol. A combination of the characterization techniques showed that the tungsten and aluminum were incorporated into SBA-15 homogeneously, and the platinum nanoparticles could be uniformly dispersed on the modified-SBA-15. The catalytic performance of Pt-loaded SBA-15 could be significantly improved after the incorporation of tungsten and aluminum into SBA-15, reaching a 1,3-PDO selectivity near 50% when the glycerol conversion was 66%. The glycerol hydrogenolysis reaction proceeds through a dehydration–hydrogenation process, and the enhanced 1,3-PDO selectivity greatly benefited from the synergism between Brønsted acid and Lewis acid sites, which is tightly related with the incorporation of tungsten and aluminum species on the modified SBA-15.
研究领域:
催化化学
·
材料科学
·
绿色化学
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能源化工
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纳米催化
·
多相催化
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Jing Guo,Jianguo Jiang,Xiaolong Gu,Xia Li,Tianqing Liu
Multiple emulsions provide a facile route for particle preparation due to their ability to be used as liquid templates. Herein, biocompatible oil-in-water-in-oil (O 1 /W/O 2 ) double emulsions were fabricated using a two-step procedure and applied as templates for preparation of calcium alginate hydrogels with encapsulated β-carotene. The encapsulation efficiency ( EE ) of β-carotene showed a positive correlation to the outer-to-inner droplet size ratio of the O 1 /W/O 2 emulsion. The maximum EE , ∼50 wt%, could be achieved in the freshly prepared O 1 /W/O 2 emulsion when using aqueous alginate of 2 wt% as the intermediate phase and β-carotene-loaded R-(+)-limonene of 0.1 wt% as the inner oil phase. Gelation of the alginate phase was induced by addition of a small amount of aqueous CaCl 2 into the β-carotene-loaded O 1 /W/O 2 emulsion. The resulting hydrogels in water were characterized by laser diffraction and several microscopy measurements. The hydrogels showed good spherical shape and their average size was a little larger than that of the emulsion droplet templates. This work contributed to the understanding of encapsulation in O 1 /W/O 2 emulsion system and provided a novel methodology for encapsulation of carotenoids and other lipophilic bioactives.
研究领域:
食品科学
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材料科学
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DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2023
·
IF 6.4
He Zhang,Xiao-Chun Deng,Guo-Hua Zhang
In this study, high performance W–Mo–Cu–Ni–Fe alloy samples with additions of Mo (0–6 wt%), Ni and Fe (total content: 2.5 wt% and 5 wt%) were obtained through liquid-phase sintering at lower temperature, with the raw material of ultrafine W–Mo–Cu–Ni–Fe composite powder. Ultrafine W–Mo–Cu–Ni–Fe alloy powder with strong sintering activity and uniform composition was obtained by two-stage reduction means composed of carbothermic pre-reduction and hydrogen deep deoxidation steps. Significantly, the bonding ability of W/Cu phase interface and the wettability of two phases are greatly improved due to the presences of Ni and Fe. Moreover, the addition of appropriate Mo content was advantageous to the formation of W–Mo solid solution . All alloy samples achieved higher densification degrees to guarantee that the sintered blocks possess outstanding overall performances. Especially, by adjusting Ni/Fe ratio, the highest tension strength and elongation of were achieved by W-2wt.%Mo-1.75 wt%Ni-0.75 wt%Fe-27.5 wt%Cu sintered block, which were 567 MPa and 10.37%, respectively. Moreover, owing to the presences of W–Mo and Cu–Ni–Fe solid solutions, this alloy also had the highest microhardness and bending strength of 446 HV and 1473 MPa, respectively. As increasing Mo content from 0 wt% to 6 wt%, the compression strength of sintered blocks was improved, and failure strains of all the sintered blocks are close to 100%, respectively. However, even though the Cu matrix network structure is more evenly distributed as a result of the existences of added Ni and Fe, the electronic movement ability of the sintered blocks was reduced, leading to a significant decrease in conductivity.
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Xiaopeng Hu,Anlin Zhang,Huapeng Sun,Fanhua Zeng,Yanhua Lei,Lianwu Xie,Ruijin Yu,Bin Deng,Huihong Lin
Novel red-emitting phosphors, Sr 3 LaTa 3 O 12 :Eu 3+ (SLTO:Eu 3+ ), have been successfully synthesized for use in white light-emitting diodes (w-LEDs) and latent fingerprint (LFP) visualization applications. The crystalline structure, bandgap, and photoluminescence (PL) of the SLTO:Eu 3+ phosphors were thoroughly investigated. Under 395 nm excitation, SLTO:Eu 3+ phosphors emitted orange-red light at the wavelength of 616 nm due to the 5 D 0 - 7 F 2 transition of Eu 3+ ions. The optimal doping concentration of the phosphor is x = 0.30 and the neighbor ions interaction is the most critical factor in the concentration quenching mechanism of the SLTO:Eu 3+ phosphor. Furthermore, the SLTO:0.30Eu 3+ phosphor exhibit higher thermal stability compared to the conventional red phosphor (Sr 2 Si 5 N 8 :Eu 2+ ). The packaged w-LED showed a correlated color temperature (6887 K), excellent color rendering index (95), and Commission International de l'Eclairage (CIE) coordinates of (0.305, 0.334). The SLTO:0.30Eu 3+ phosphor effectively detected level 1–3 structures of LFPs under ultraviolet irradiation , and ultimately detected LFPs in various daily life circumstances. These findings indicate that the SLTO:0.30Eu 3+ phosphor might be a viable option for w-LED lighting applications and LFPs visualization.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaohui Wu,Jingkang Xu,Yulan Jing,Yuanxun Li,Hua Su
The increasing demand for miniaturized electronic devices requires the development of advanced medium-high K materials. In this work, novel (Ti 1/2 W 1/2 ) 5+ -substituted LiNb 0.6- x (Ti 1/2 W 1/2 ) x Ti 0.5 O 3 (LNT- x TW, 0 ≤ x ≤ 0.12) ceramics were successfully prepared by the solid-state method. The increase in TW content led to the formation of LNT-0.08 TW ceramic with medium-high K and high Q × f after sintering at 1050 °C. This ceramic also recorded improved characteristics with ε r ∼53.84, Q × f ∼7482 GHz and τ f ∼43.43 ppm/°C related to ionic polarizability, large grains, high densification, and [Ti 2 O 3 ] 2+ / N layers. In addition, Li 2 O–B 2 O 3 –SiO 2 –CaO–Al 2 O 3 (LBSCA) used as an effective sintering aid, improved densification and promoted sintering by not only decreasing the temperature to 900 °C, but also enhancing the microwave dielectric properties with ε r ∼49.46, Q × f ∼8149 GHz, and τ f ∼12.04 ppm/°C. The Q × f value was estimated to 1.15 ∼ 2-fold higher than other LNT-based ceramics within stable τ f . More encouragingly, the LNT-0.08 TW ceramic also showed good chemical match with Ag, suggesting usefulness for miniaturized LTCC devices.
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yufeng Du,Yuxin Li,Yixuan Zhao,Xinyu Zhang,Changlin Li,Ruiqi Yang,Zhequan Zou,Jingjing Lian,Jinyou Duan,Huihong Lin,Ruijin Yu
A new series of red luminescent Cd 2 MgTeO 6 : x Eu 3+ ( x = 0.5–50 mol%) phosphors was successfully synthesized through a high-temperature solid-phase reaction at 1000 °C. The synthesized phosphors were investigated for their phase purity, surface morphology , elemental distribution, and luminescence properties. Strong orange-red light emission (617 nm) was observed upon excitation at 398 nm, which was attributed to the electric dipole 5 D 0 - 7 F 2 transition of Eu 3+ . The optimal doping concentration was found to be x = 20 mol%. Concentration quenching mechanism was identified as the interaction of near-neighbor ions. The chromaticity coordinates of all the Cd 2 MgTeO 6 :Eu 3+ samples were found to be located in the red region and were almost the same. The Cd 2 MgTeO 6 : 20 mol%Eu 3+ phosphors exhibited an unusual thermal quenching behavior, maintaining 102% of the initial intensity, thus possessing excellent thermostability. Moreover, the manufactured white light diode demonstrated a good color rendering index ( R a = 89) with the coordinates of (0.344, 0.330) by the Commission International de L'Eclairage (CIE). Additionally, the Cd 2 MgTeO 6 : 20 mol%Eu 3+ phosphor was surface-functionalized with oleic acid (OA) (Cd 2 MgTeO 6 : 20 mol%Eu 3+ @OA) to aid in the identification of Level I-III fingerprint details with high resolution and contrast. Good visualization of the latent fingerprint (LFP) was observed on different substrates. Therefore, Cd 2 MgTeO 6 :Eu 3+ phosphors hold great promise for the visualization of w-LEDs and LFPs.
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Ningyuan Wang,Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
Traditional vanadium-based selective catalytic reduction (SCR) deNO x catalyst can hardly adapt to the gas conditions (much high NO 2 /NO x ratio at lower temperature) of the start-up and low loading periods for a gas turbine . Therefore, a W–Ti-CeO x catalyst with NO x storage and reduction (NSR) function was developed in this work for gas turbine exhaust NO x elimination. The experimental results reveal that W–Ti-CeO x catalyst exhibits high NO 2 adsorption capacity at relatively low temperature while that is quite low for V–W/TiO 2 . The abundant surface Ce 3+ species can be mainly responsible for its high adsorption ability owing to the reaction between NO 2 and Ce 3+ to form nitrate/nitrite species and NO. Meanwhile, the adsorption capacity of W–Ti-CeO x can easily regenerate at medium–high temperature and NH 3 -SCR reaction. Furthermore, W–Ti-CeO x also shows good NH 3 -SCR activity, which can fulfill the deNO x process at high temperature. The addition of W and Ti into ceria can enhance the surface acidity and redox ability, thereby increasing the SCR activity. This work proposes a novel storage-reduction strategy for NO x elimination throughout the operation of gas turbines.
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产品关联
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高影响因子
Journal of Essential Oil Bearing Plants
·
2022
·
IF 1.971
Yuanyuan Zhang,Lin Zhang,Yongbin Meng,Yuangang Zu,Feng Han,Xiuhua Zhao
The utilization of natural product resources is significant for economic growth and health care. Herein, Cinnamomum longepaniculatum essential oil (CLEO) was isolated by microwave-assisted hydrodistillation (MAH). The composition of CLEO was determined by gas chromatography/mass spectrometry (GC/MS), and the antibacterial, nematicidal and anxiolytic activities of CLEO were evaluated. GC/MS results revealed that 33 compounds were identified, accounting for 99.87% of the total identified compounds. The major components of CLEO were monoterpenes, including β-myrcene (22.55%), eucalyptol (11.59%), α-pinene (11.56%), terpinen-4-ol (8.63%). Further research found that CLEO can inhibit the growth of Staphylococcus aureus (MIC 7.13 mg/mL, MBC 14.25 mg/mL), Escherichia coli (MIC 14.25 mg/mL, MBC 57 mg/mL), and Pseudomonas aeruginosa (MIC 14.25 mg/mL, MBC 28.50 mg/mL), the zone of inhibition were 17.49 ± 0.51 mm, 13.35 ± 0.27 mm and 15.15 ± 0.31 mm, respectively. CLEO could increase cell membrane permeability and make β-galactosidase, protein and other substances leak from the cell. Importantly, CLEO was first used to kill pine wood nematodes (PWN, Bursaphelenchus xylophilus). It was found that CLEO was toxic to B. xylophilus (LC50=30.81 mg/mL), and PWN treated with CLEO rapidly died and extended. Furthermore, CLEO was used in anxiolytic for the first time. CLEO inhalation can effectively relieve anxiety-like behaviors in open-field test (OFT) and elevated plus-maze test (EPT), and restore neurotransmitters (5-HT, NE, GABA) in brain tissue to normal levels. This study provides a strategy for the industrial production of CLEO and discovers its potential role in food transportation and preservation, forest pest control, and relief of emotional disorders such as anxiety and stress, which are beneficial to health care and economic development and provides a basis for broader application of CLEO.
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产品关联
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高影响因子
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