Journal of Cleaner Production
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2020
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IF 7.246
Chengcheng Shi,Dachao Yuan,Luping Ma,Guangsheng Fu,Shufang Wang,Yaguang Li
Sunlight-driven toluene elimination system faces the problems of low reaction rate, secondary pollution, and especially tricky to large-scale production. In this work, we used a PVP assisted spray drying method to synthesize Cu doped CeO 2 microspheres with the merits of zero waste water and solids discharge, kilogram level yield, uniform dispersion of Cu, and high toluene combustion activity. Further, a new photothermal device was constructed to heat catalysts to 295 °C under one standard sunlight irradiation. As a result, the new photothermal device supported Cu doped CeO 2 microspheres showed a full oxidation of toluene at the rate of 59.82 mmol g −1 h −1 under 1 sun irradiation, 150 times higher than the advanced sunlight-driven toluene elimination. An industrial demonstration of this new system was developed, and this system was able to completely deal with 22.2 m 3 h −1 of exhaust with the toluene concentration of 1–10,000 ppm under 1 m 2 of outdoor sunlight irradiation in the daytime of winter, showing the potential on industrial applications.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 35
·期 1
·e6066
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IF 3.14
You Han,Yulian Wang,Yan Wang,Yubing Hu,Yao Nian,Wei Li,Jinli Zhang
A series of Cu-pyrrolidone/spherical activated carbon (SAC) catalysts were prepared via a simple incipient wetness impregnation method and then assessed in acetylene hydrochlorination, and the catalytic evaluation result indicated that the 1-methyl-2-pyrrolidinone (NMP) ligand was found to be the most effective one to significantly improve the activity and stability of Cu catalyst. The catalyst with the optimal molar ratio of NMP/Cu = 0.25 showed 94.2% acetylene conversion at 180°C and an acetylene gas hourly space velocity of 180 h −1 . Moreover, the acetylene conversion of Cu-0.25NMP/SAC remained stable over 99.1% for about 220 h under the industrial condition. Transmission electron microscopy (TEM) analyses proved that NMP ligand improved the dispersion of Cu species. In addition, hydrogen temperature-programmed reduction (H 2 -TPR), X-ray photoelectron spectra (XPS), thermogravimetric analysis (TGA), and Brunner–Emmet–Teller (BET) indicated that the additive of NMP was preferential to stabilize the catalytic active Cu + and Cu 2+ species and inhibit the reduction of Cu α+ to Cu 0 during the preparation process and reaction, hence restraining the coke deposition. Furthermore, the steady coordination structure between Cu and NMP was confirmed by Fourier-transform infrared spectra (FT-IR) and Raman combining with density functional theory (DFT) calculation, which could effectively lower the adsorption energy of catalyst for C 2 H 2 and inhibit the serious carbon deposition caused by excessive acetylene self-accumulation. Our findings suggest that the efficient, well-stabilized cost-effective, and environmentally friendly Cu catalyst has great potential in acetylene hydrochlorination.
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TALANTA
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2020
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IF 5.339
Zhixia Yao,Hanmeng Liu,Yaosheng Liu,Yongxing Diao,Guangxing Hu,Qifang Zhang,Zhuang Li
A novel fluorometric strategy is proposed for detecting curcumin by polyvinyl pyrrolidone-templated Cu NCs (PVP–Cu NCs) as a fluorescent probe which exhibits excitation/emission peaks at 380/510 nm. The fluorescent excitation and emission spectra of PVP-Cu NCs have a striking overlap with the UV–vis spectrum of curcumin, and the fluorescence lifetime of PVP-Cu NCs decreases after the addition of curcumin. Curcumin leads to fluorescence quenching based on fluorescence resonance energy transfer . This method allows for the determination of curcumin in the range of 0.1–10 μg mL −1 and the detection limit is 21 ng mL −1 . Furthermore, this method displays good selectivity and is successfully applied for real sample analysis.
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2020
·
IF 5.006
Hong Du,Xiuyun Ma,Miao Jiang,Peifang Yan,Z. Conrad Zhang
The production of furfuryl alcohol from furfural hydrogenation in gas phase is of great significance for the valorization of biomass. The existing catalyst for this transformation suffers from high cost and complex preparation process. Thus, a highly efficient copper catalyst was developed by a simple impregnation method using ethanolamine modified granular silica as carrier. The catalytic performance was related to the amount of ethanolamine used in modification. Highly dispersed copper with uniform particle size distribution was obtained from appropriate amount of ethanolamine modified granular silica. The ethanolamine modified granular silica (mass ratio between ethanolamine and silica was 3 in the initial modification mixture) supported copper catalyst exhibited the best performance in terms of catalyst lifetime thanks to its maximum amount of Cu 0 sites and largest amount of Cu + sites. A slow deactivation of the catalyst after extended time on stream evaluation is attributed to carbon deposition and slow copper sintering.
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高影响因子
Journal of Materials Research and Technology-JMR&T
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2020
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IF 5.289
Wei Wang,Yaping Liu,Gang Wang,Caiwang Tan,Wei Cao
In this study, the carbon fiber reinforced ZrB 2 -SiC composite ceramic was joined to Ti6Al4V alloy with Ag-Cu eutectic alloy filler at varied holding time and a fixed temperature of 800℃. Interface microstructure and shear strength of brazing joints were studied. The brazed ZSC f ceramics/AgCu/TC4 alloy is endowed with good metallurgical bondings. A typical interfacial structure of joints brazed for 10 min was found as ZSC f /TiC/Ti 5 Si 3 /Ag(s,s)/Cu(s,s) + TiC/TiCu/Ti 2 Cu/(TiC + TiCu)/TC4 alloy. Increase of holding time did not vary the precipitated phase of the joints but decreased thickness of the Ag(s, s) and Cu(s, s) reaction layer and gradually thickened the Ti-Cu reaction layer near the TC4 side. The formation process of reaction products was discussed in detail. The holding time substantially influenced shear strength of the joints. A maximum shear strength of 39 MPa was reached at a brazing time of 20 min.
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IONICS
·
2020
·Vol. 26
·期 8
·4193-4200
·
IF 2.394
Zheng Li,Sun Wu-juan
A 3D metal-organic framework (Cu 4.5 (BTZE) 1.5 (OH) 4 (SO 4 )(H 2 O) 1.5 ∙4H 2 O) n (BTZE is 1,2-bis(tetrazol-5-yl) ethane anion) modified carbon paste electrode (Cu-BTZE/CPE) has been fabricated for hydrazine sensing. The Cu-BTZE framework was prepared through a facile solvo-thermal method and characterized by Fourier-transform infrared spectrometry, X-ray diffraction, and scanning electron microscopy. Meanwhile, the electrochemical performances of the modified electrode were studied by electrochemical impedance spectroscopy, chronocoulometry, cyclic voltammetry, and amperometry. Owing to the large electrochemically active surface area and enhanced electron transfer efficiency of Cu-BTZE framework, the Cu-BTZE/CPE showed enhanced electrocatalytic activity toward the oxidation of hydrazine compared with unmodified CPE. Under the optimized conditions, the amperometric current presented linear dependence on the concentration of hydrazine in the ranges of 0.02~1.2 μM and 1.2~500 μM, respectively. The detection limit was 6 nM, lower than the reported Cu-based hydrazine sensors. Furthermore, the sensor has applied for the determination of hydrazine in water samples.
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高影响因子
INORGANICA CHIMICA ACTA
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2020
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IF 2.304
Ping-Ping Sun,Yu-Hang Zhang,Xuehua Yu,Qi Shi,Bo Tian,Jun Gao,Fa-Nian Shi
A new 3-dimensional (3D) Mn-based metal organic framework (Mn-MOF) was created through hydrothermal method. This Mn-MOF has the molecular formula of C 10 H 10 Mn 3 N 4 O 12 and possesses orthorhombic symmetry in the Pbcn space group. As the electrode material for supercapacitors, a small amount of Cu powder is added to modify the electrode material (Mn-MOF-Cu), which has higher specific capacitance, better cycle stability and longer cycle life than the Mn-MOF. The specific capacitance of the optimized electrode material can reach 1606 F g −1 at 0.5 A g −1 , which is significantly higher than the original Mn-MOF electrode material (1106 F g −1 ). The key aspect which improves the electrochemical behavior of Mn-MOF-Cu is the introduction of Cu powder as a conductive additive, so that the advantages of the unique 3D structure of the Mn-MOF in terms of electron transport can be better displayed.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Saisai Chen,Chaohai Wang,Ming Zhang,Wuxiang Zhang,Junwen Qi,Xiuyun Sun,Lianjun Wang,Jiansheng Li
Fast and efficient tracking of micropollutants in aquatic environment by developing novel electrode materials is of great significance. Herein, a polyvinylpyrrolidone (PVP) assisted strategy is applied for synthesis of nitrogen doped Cu MOFs (N-Cu-MOF) for micropollutants electrochemical detection. The designed N-Cu-MOFs possess uniform octahedral shape with large surface area (1184 m 2 g −1 ) and an average size of roughly 450 nm, exhibiting the excellent electroanalytical capability for the detection of multipollutants. In the case of dopamine (DA) and sulfonamides (SA) as typical microcontaminants, the designed N-Cu-MOFs exhibited wide linear ranges of 0.50 nM–1.78 mM and low detection limit (LOD, 0.15 nM, S / N = 3) for the determination of DA, as well as a linear range of 0.01–58.3 μM and LOD (0.003 μM, S / N = 3) for monitoring SA. The improved performance is attributed to the heteroatom introduction and good dispersion stability of N-Cu-MOF with PVP-decorated. The good electroanalytical ability of N-Cu-MOF for detection of DA and SA can provide a guide to efficient and rapid monitor other micropollutants and construct novel electrochemical sensors.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2020
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IF 2.779
Mengfan Liang,Qiang Lei,Shuhong Sun,Yan Zhu
In this article, the effect of the distinctiveness and arrangements on the plasmonic resonance of Cu–Ag system were studied by finite element method , and the effect of morphologies on the plasmonic properties of Cu@Ag core@shell NPs and Cu–Ag corn-cob liked NPs was investigated by experiment. For Cu@Ag core-shell structure, as the fixed thickness of Ag-shell at 10 nm, the dipole plasmon resonance gradually blue-shifts with increasing the radius of Cu core, and as the fixed radius of Cu-core at 50 nm, the feature peak shows a red-shift and broadening with increasing the thickness of Ag shell. For Cu–Ag corn-cob structure, the feature for different Ag coverage are similar to each other and most of the them follow the blue-shifted tendency with the increase the degree of Ag-coverage. Furthermore, as the regular-shaped structure increases (form trigonal to spherical), the plasmon resonance gradually blue shifts, and finally, we use two parameters to describe the different idealized Cu–Ag structure: separation, exterior contact, intersection and core@shell. The combined information from our simulation and experiment will give guidelines for choosing adequate particles when aiming at certain plasmonic properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yan Zhang,Haryo Wibowo,Li Zhong,Mika Horttanainen,Zunbo Wang,Caimeng Yu,Mi Yan
High CO 2 content exists in the raw syngas produced from supercritical water gasification of food waste, CO 2 removal to improve quality of the syngas is necessary before further utilization. In this study, Cu-BTC, Mg/Cu-BTC, Cu-BTC@MWCNT, and Mg/Cu-BTC@MWCNT were synthesized and characterized as CO 2 adsorbents. The adsorption experiments were conducted to investigate the optimal adsorbent and adsorption conditions. The results indicated that Mg 2+ and multi-walled carbon nanotubes (MWCNT) doped into Cu-BTC influenced the physical properties of adsorbents. Among of all studied adsorbents, Mg/Cu-BTC@MWCNT had the maximum CO 2 adsorption capacity (3.63 mmol/g) and selectivity (14.28) at 25 °C and 100 kPa. Analysis of variance (ANOVA) exhibited that adsorption pressure had significant effects on CO 2 adsorption capacity of Mg/Cu-BTC@MWCNT. The influences of different operating parameters on CO 2 adsorption capacity and selectivity were discussed in Mg/Cu-BTC@MWCNT. The adsorption isotherms of gas components on Mg/Cu-BTC@MWCNT can be sorted as follows: CO 2 > CO > CH 4 > H 2 . In additional, the regeneration experiment with 5 times was conducted and the result showed that Mg/Cu-BTC@MWCNT has high stability.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Dan Li,Feigao Xu
ZIF-8@GO-X (X = 0, 2.48%, 4.07%, 7.83%, and 20.03%) composites were prepared using GO and ZIF-8. The composites were used to absorb Cu(Ⅱ) from aqueous solutions. With increasing GO content, the adsorption of the ZIF-8@GO-X composites first increased and then decreased. The Cu(Ⅱ) adsorption of ZIF-8@GO-7.83% reaches a maximum among ZIF-8@GO-X composites (X = 0, 2.48%, 4.07%, 7.83%, and 20.03%). The adsorption kinetics , adsorption isotherm , adsorption thermodynamics, and adsorption mechanism of Cu (II) by ZIF-8@GO-7.83% were studied in this paper. The results showed that the adsorption reached equilibrium at 120 min, and ZIF-8@GO-7.83% approached equilibrium relatively quickly. When the temperature was 45 °C and the Cu(Ⅱ) concentration was 40 mg/L, the maximum adsorption capacity of ZIF-8@GO-7.83% for Cu(Ⅱ) reached 482.29 mg/g. The equilibrium data and kinetics were well described by Langmuir and pseudo-first-order models, respectively. Final experiments with real factory wastewater (initial Cu(Ⅱ) concentration of 670 mg/L) revealed that 0.37 g/L ZIF-8@GO-7.83% can efficiently reduce the Cu(Ⅱ) concentration to below 2 mg/L.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yunrui Wei,Weidong He,Pengxiao Sun,Jiangmei Yin,Xiaolong Deng,Xijin Xu
Cu/Cu 2 O/Cu 2 S nanotubes (NT) with rough-surfaces and hollow heterostructure structures have been synthesized by sulfurizing the as-prepared Cu/Cu 2 O nanowires (NWs). The Cu/Cu 2 O/Cu 2 S NT electrode exhibits excellent hydrogen evolution reaction (HER) performance with low onset overpotential of 48 mV and a Tafel slope of 107 mV dec −1 in acidic solution. Furthermore, the overpotentials are only ~86 and ~214 mV to achieve current densities of 10 and 100 mA cm −2 . The impressive catalytic performance of Cu/Cu 2 O/Cu 2 S NT toward HER can be attributed to the unique rough-surfaces, hollow structure, and the synergistic effect between multiple atoms and ions.
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