CATALYSIS LETTERS
·
2023
·
IF 2.8
Ji Yaxiong,Lin Shuang,Xu Guihong,Chen Tianen,Gong Jianchao,Meng Fanbin,Wang Yuanhao
Abstract Catalytic conversion of CO 2 to methanol with H 2 from renewable energy has attracted increasing interest as a promising strategy for reducing excessive CO 2 emissions. However, the performance of reported various catalysts still suffers from low methanol yield with a passable CO 2 conversion. In this work, Cu–ZnO–La 2 O 3 interfaces are constructed with various La 2 O 3 mole ratio. Compared to Cu/ZnO, the optimized catalyst (i.e., Cu 0.6 Zn 0.2 La 0.4 ) exhibits a much higher mass-specific methanol formation rate (159.3 g MeOH /kg cat /h) at 240 °C and 3 MPa. A series of ex-situ and in-situ characterizations, such as X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), N 2 O titration measurements, and in-situ diffuse reflectance Fourier transform infrared spectroscopy ( in-situ DRIFTS) study, are used to investigate its structure and mechanism study. The dispersion of Cu over Cu/ZnO/La 2 O 3 catalyst is significantly enhanced, forming more Cu–ZnO–La 2 O 3 interfaces. LaO x species favor CO 2 activation and generate more carbon intermediates species for CO 2 hydrogenation. Furthermore, more Cu + is bonded, which stabilizes the key intermediate, inhibits its desorption, and facilitates its further hydrogenation to methanol. This work is expected to offer an effective strategy to develop new catalysts with high performance for CO 2 hydrogenation to methanol. Graphical Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Junao Zhang,Xin Xie,Xi He,Xiangnan Gong,Xin Zhang,Anping Liu,Yingzhou Huang
Surface-enhanced Raman Spectroscopy (SERS) has emerged as a powerful and sensitive technique for the detection of various molecules, including gaseous analytes. However, the development of efficient, stable, and reusable SERS substrates for gaseous molecule remains a challenge. This work introduces a novel Cu-Ag@ZIF-8 film for SERS detection of gaseous molecule, which consists of Ag nanoparticles (AgNPs) core and ZIF-8 porous shell on Cu foils. With strong enhancement of electromagnetic field by AgNPs core and effective caption of gaseous molecule by ZIF-8 porous shell, this substrate exhibits good SERS performance of p-aminothiophenol (PATP) and 4-mercaptophenol (DP) gaseous molecules, whose limit of detection (LOD) could reach 9.12 × 10 −10 M and 9.91 × 10 −9 M, respectively. Furthermore, the detection of gaseous benzaldehyde diffused by oil paint is explored by this developed SERS substrate for application. To achieve accurate identification of harmful gaseous molecule in complex volatile organic compounds (VOC), the deep learning (DL) approach is performed based on SERS spectra obtained from this Cu-Ag@ZIF-8 film. Our results demonstrate that the identification of gaseous benzaldehyde in VOC diffused from commercial oil paint has a high accuracy at 97.7% with the help of ANN algorithms, which points out the Cu-Ag@ZIF-8 film has good performance and huge potential for SERS detection of gaseous molecule.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
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IF 4.2
Shan Zhang,Binbo Jiang,Mingliang Tong,Yao Yang,Zuwei Liao,Zhengliang Huang,Jingyuan Sun,Jingdai Wang,Yongrong Yang
Cost-effective heterogeneous catalysts are critical to the ketonization of carboxylic acids for producing biofuels and platform chemicals. Herein, nanocrystalline Cu-loaded CeO2 with 1.0–9.0 wt % Cu loadings was synthesized by the precipitation-impregnation method, in which 3.0 wt % Cu/CeO2 exhibits the best performance of 72% acetone yield at 330 °C, 97% 3-pentanone yield at 360 °C, and 86% 4-heptanone yield at 400 °C, with good durability up to 10 h on stream. Detailed analyses reveal that 3.0 wt % Cu/CeO2 has the highest percentage of O-vacancy sites, more moderate acid–base sites, and better capacity to adsorb and activate carboxylic acids. In situ DRIFT spectra indicate that monodentate, bridging bidentate, and chelating bidentate modes coexist when carboxylic acid is dissociatively adsorbed on 3.0 wt % Cu/CeO2. Based on the above investigations, we propose a mechanism over 3.0 wt % Cu/CeO2 through the β-ketoacid intermediate route, which gives more details to help future research into the design and development of catalysts for ketonization.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hongwei Yang,Fang Xu,Yulong Liao,Yong Ren,Guixiang Liu,Xingwu Yuan,Yanhui Wu,Honglan Lai,Bo Dai
In this work, NiCuZn ferrites with different CuO contents were prepared by solid-state method. The influences of the divalent Cu 2+ on the crystal structure, microstructure and magnetic properties of NiCuZn ferrite were studied in detail. X-ray diffraction characterization showed that Cu 2+ may either replace Ni 2+ and enter into crystal lattice, or distributed at grain boundaries in the form of compound. SEM results showed that adding appropriate amount of CuO can promote grain growth and prepare dense NiCuZn ferrites. Especially, the density of the ferrite sample reaches its maximum value of 5.23 g/cm 3 when the amount of CuO is 0.20. However, superfluous Cu 2+ exists in the form of liquid phase at local grain boundaries once the content of Cu 2+ reached 0.25. Moreover, the magnetic hysteresis loops revealed that the specific saturation magnetization first increased and then decreased and the highest value of 76.6 emu/g was obtained at x = 0.10. Consequently, a NiCuZn ferrite with an appropriate microstructure and with high density (5.16 g/cm 3 ), high saturation magnetization (76.0 emu/g), low ferromagnetic resonance (FMR) linewidth (160 Oe) and 4π Ms (4930 G) could be obtained at a Cu content of x = 0.15.
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IONICS
·
2023
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IF 2.8
Wei Yunping,Wang Nan,Liu Xingcen,Lin Meng
In this experiment, a copper-based metal–organic framework (Cu-BTC) was successfully prepared and utilized to compose a copper-tannic acid (TA) complex by in situ tannic acid etching on indium tin oxide (ITO) glass. The Cu-BTC was obtained by the electrodeposition method with a voltage of − 1.6 V. The TA-Cu complex retains the frame structure of the metal–organic framework and has good electrochemical properties. Cyclic voltammetry (CV) and amperometric methods were used to estimate the performance of the TA-Cu-modified electrode in glucose detection. The current response of the TA-Cu sensor shows a linear relationship with glucose concentration at 0.5 V in NaOH solution. The modified electrode as an electrochemical glucose sensor exhibits good sensitivity with a low detection limit of 0.002 mM. The TA-Cu-modified electrode also exhibited good stability, anti-interference, and repeatability in glucose detection.
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APPLIED CATALYSIS A-GENERAL
·
2021
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IF 5.706
Chaoqin Xu,Zhiqiang Yan,Jian Yu,Xiaoyue Wang,Hongyan Ban,Yan Wang,Congming Li
Improving the stability of Cu-based catalysts, especially in the presence of water, has always been a great challenge. The hydrophobization strategy and effects on the catalyst surface property and catalytic performance deserve rigorous investigations. Herein, the hydrophobic modified silica was introduced as a support for CuZn catalyst to hinder the adsorption of water on active sites of Cu-based catalysts, thereby improving its stability. And silane agents (methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane) were selected to modify the SiO 2 surface by a reaction between the silane agent and the hydroxyl groups on the silica surface. After modification, the catalysts exhibited the better stability for methanol synthesis in the presence of water. FT-IR, BET, H 2 -TPR, XRD, TEM, XPS characterization were employed to determine the surface physical properties, reduction properties, crystal structure and particle size of the catalysts before and after the reaction. The results showed that water can simultaneously cause the oxidation and growth of Cu species resulting in the deactivation of Cu-based catalyst. However, the introduction of hydrophobic groups reduced the contact time between water and the active center, which prevented the growth and oxidation of Cu species, thus improving the catalyst stability.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-11
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IF 4.38
Ye Jien,Wang Yi,Xu Qiao,Wu Hanxin,Tong Jianhao,Shi Jiyan
Passivation of nanoscale zerovalent iron hinders its efficiency in water treatment, and loading another catalytic metal has been found to improve the efficiency significantly. In this study, Cu/Fe bimetallic nanoparticles were prepared by liquid-phase chemical reduction for removal of hexavalent chromium (Cr(VI)) from wastewater. Synthesized bimetallic nanoparticles were characterized by transmission electron microscopy, Brunauer–Emmet–Teller isotherm, and X-ray diffraction. The results showed that Cu loading can significantly enhance the removal efficiency of Cr(VI) by 29.3% to 84.0%, and the optimal Cu loading rate was 3% (wt%). The removal efficiency decreased with increasing initial pH and Cr(VI) concentration. The removal of Cr(VI) was better fitted by pseudo-second-order model than pseudo-first-order model. Thermodynamic analysis revealed that the Cr(VI) removal was spontaneous and endothermic, and the increase of reaction temperature facilitated the process. X-ray photoelectron spectroscopy (XPS) analysis indicated that Cr(VI) was completely reduced to Cr(III) and precipitated on the particle surface as hydroxylated Cr(OH) 3 and Cr x Fe 1−x (OH) 3 coprecipitation. Our work could be beneficial for the application of iron-based nanomaterials in remediation of wastewater.
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PubMed
高影响因子
Materials Express
·
2021
·Vol. 11
·期 6
·1001-1006
·
IF 0
Kong Lijun,Chen Jiahao,Peng Zehui,Zhang Jiawei,Gao Yuan,Yan Shancheng
Metal alloy nanosheets play a very important role as catalysts, which also show obvious advantages in the field of biosensor. Compared with traditional methods, such as enzyme method, gas chromatography or optical absorbance, the detection of ascorbic acid is simpler and more stable
by spectroscopy. Ag–Cu alloy nanosheets with a thickness of about 1–3 nm and an average lateral size of 3–5 nm were synthesized in this study by the soft template method. These nanosheets were used to construct a sensor for measuring the concentration of ascorbic acid. The
initial UV-Vis absorption peaks for the Ag–Cu alloy nanosheets in aqueous solution were effectively quenched upon addition of ascorbic acid. As the ascorbic acid concentration was in the range of 5–250 mmol/L changes, the UV absorbance intensity for the sensor also changed. Because
of its wide detection range, high sensitivity, and excellent stability, the Ag–Cu alloy sensor method may be an excellent alternative to the traditional ascorbic acid measure method.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Zhiyue Dong,Liang Zhang,Jiang Gong,Qiang Zhao
Covalent organic frameworks (COFs) nanostructures capable of efficient visible light absorption, complete holes-electrons separation, and reactant enrichment remain a synthetic challenge for advanced photocatalysts. Herein, we rationally design a novel Cu-coordinated terpyridyl-based, 2D lamellar COF-909(Cu) nanorods. The coordinated single Cu sites not only dramatically enhance the visible light absorption and achieve the complete electrons-holes separation, but also provide the specific binding sites to enrich N/O-containing organic toxicants. The laminar arrangement and 1D nanochannel of COF-909(Cu) nanorods shorten the transfer distance of electrons to the active sites. As a proof of concept, it shows excellent performance in the photocatalytic degradation of sulfamethoxazole, which surpasses the-state-of-art photocatalysts. Density functional theory calculations confirm the structure-function relationship between the single Cu sites and the complete electrons-holes separation as well as strong binding sites for target molecules.
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VACUUM
·
2021
·
IF 3.627
Shuang Liu,Lihua Li,Meng Zhou,Shengli Liang,Yi Zhang,Jinliang Huang,Baohong Tian,Yongfeng Geng,Yong Liu,Yanlin Jia,Xu Li,Alex A. Volinsky
A graphene reinforced Cu/CeO 2 Cr electrical contact material with high strength and electrical conductivity was designed. Graphene oxide (GO) was prepared with modified Hummers' method. Composite powders of GO, ceria nanoparticles , copper and chromium were prepared by freeze-drying. The GO-Cu/0.5CeO 2 30Cr electrical contact material was prepared by spark plasma sintering . Raman and X-ray photoelectron spectroscopy (XPS) characterization results indicated that during the sintering process, the graphene oxide was transformed into reduced graphene oxide (RGO). In addition, SEM and TEM characterization results indicated that the CeO 2 nanoparticles were uniformly dispersed in the matrix, which hindered the movement of dislocations and improved the strength of the matrix, and a small amount of carbon atoms combined with Cr to form Cr 3 C 2 , enhancing the interface bonding. Compared with Cu/0.5CeO 2 30Cr composites, the electrical conductivity, hardness, tensile strength , and welding resistance of the two composites containing 0.5 wt% and 1.0 wt% GO were both improved and the 0.5GO-Cu/0.5CeO 2 30Cr composites have better welding resistance.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Shanshan Wang,Yingyi Wang,Yi Peng,Xiaoming Yang
Integrating kinds of bactericides as one entirety shows prospect for improving antibacterial efficiency, thus a new type of nanoclusters based on bactericide-directed herein emerged as a combination for achieving a higher antibacterial effect. Specifically, an easily operated approach for preparing bacitracin-directed silver, gold, and copper nanoclusters (AgNCs, AuNCs, and CuNCs, respectively) was proposed. Meanwhile, AgNCs@Bacitracin, AuNCs@Bacitracin, and CuNCs@Bacitracin emitted cyan, yellow, and red colors of fluorescence, respectively, and different sizes and nitrogen contents of these nanoclusters played a critical role for their fluorescence alterations. Significantly, AgNCs@Bacitracin exhibited robust bacteria-killing efficiency than other nanoclusters, owing to its marked damage on the bacterial membrane. Additionally, propidium iodide (PI) staining indicated the bacterial membrane damage of 72.3% to the bacteria population followed by the treatment with AgNCs@Bacitracin, and the introduction of AgNCs@Bacitracin lead to the higher reactive oxygen species (ROS) production, facilitating their attractive antibacterial activity. Moreover, this strategy of developing new nanoclusters broadened the avenues for designing the improved antibacterial materials.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Xilong Peng,Wenjin Chen,Zongjian He,Dan Li,Heng Liu,Hong Jin,Guigen Zhou,Feigao Xu
Reducing copper content in copper-containing water is a worldwide environmental problem. It has been shown that hydroxyapatite (HAP) has a significant adsorption effect on heavy metals (including Cu 2+ ). In this study, doped HAP-coated-limestone was synthesized using waste limestone, diammonium hydrogen phosphate and two kinds of chloride (Mg 2+ , Sr 2+ ). The materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrophotometry (FTIR), thermogravimetric analysis (TGA), Brunner-Emmet-Teller (BET) measurements and scanning electron microscope (SEM). It was found that the structure of Mg 2+ and Sr 2+ doped HAP-coated-limestone was similar to that of HAP-coated-limestone. The surface of doped HAP-coated-limestone is rougher, and the specific surface area is larger than that of HAP-coated-limestone. Some factors have been investigated affecting the uptake behavior, such as doped element, contact time, temperature and Cu 2+ concentration to optimize the conditions. The adsorption isotherms of Langmuir and Freundlich were studied, and it was proved that the adsorption isotherm of Langmuir was more consistent with the adsorption process of doped HAP-coated-limestone. The quasi-second-order dynamics can be better used to describe the experimental results compared with quasi-first-order dynamics. At the temperature of 30 °C, the adsorption capacity of HAP-coated-limestone for Cu (II) is 90.90 mg·g −1 , while the adsorption capacity is 214.20 and 121.61 mg·g −1 for Mg 2+ and Sr 2+ doped HAP-coated-limestone, respectively. Through the calculation of thermodynamic parameters, the results show that the adsorption process of Cu (II) on HAP-coated-limestone and doped HAP-coated-limestone becomes easier with the increase of temperature in a certain temperature range. The adsorption process on HAP-coated-limestone and doped HAP-coated-limestone is spontaneous and endothermic.
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