Asia-Pacific Journal of Chemical Engineering
·
2017
·Vol. 12
·期 3
·422-431
·
IF 0.836
Yuan Wang,Wei Zhu,Shengya Sang,Lijing Gao,Guomin Xiao
Aqueous-phase processing of biomass-derived furfural is one of the promising ways to convert biomass into useful chemicals. Supported metal catalysts are crucial in the aqueous-phase hydrogenation of furfural. Understanding the effect of acid and basic properties of supports on the performance of the catalysts will help understand the reaction pathways and develop more efficient catalysts. Here, a series of Cu-based catalysts with different supports (Al 2 O 3 , ZnO, SiO 2 , MgO, and ZSM-5) have been investigated in hydrogenation of furfural in aqueous phase. The properties of the supports have been characterized by X-ray diffraction, N 2 adsorption–desorption, transmission electron microscope, H 2 temperature-programmed reduction, and CO 2 and NH 3 temperature-programmed desorption. The results show that pure acid support leads to the formation of oligomers and pure basic support results in furfuryl alcohol as the main product. And the mass balance in reaction system catalyzed by Cu-based catalysts with higher acidity amount is lower. © 2017 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yu-Ying Wang,Xiao-Yang Zhang,Shu-Lan Li,Feng-Lei Jiang,Peng Jiang,Yi Liu
The colorimetric sensor has made great achievements in glucose sensing and diabetes prediction due to its simplicity, visualization, and lack of need for sophisticated instruments. The noninvasive sampling method has received more attention. Herein, a colorimetric agarose gel sensor was constructed by combining Cu-doped carbon nanowires (CuCNWs) with excellent peroxidase-like activity and glucose oxidase (GOx). CuCNWs can effectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with a maximum catalytic rate of 12.5 × 10–8 M s–1, which is superior to most nanomaterials reported. The modification by PVP can significantly improve the stability of CuCNWs under physiological conditions without affecting their catalytic activity. By introducing GOx, the sensitive detections of hydrogen peroxide (H2O2) and glucose in a wide range with the limit of detection as low as 30 nM and 0.2 μM can be achieved. Notably, the colorimetric agarose gel sensor exhibits a higher sensitivity than commercial test strips in detecting glucose in solution. Furthermore, it was applied to the detection of urine glucose. Diabetic urine can be easily distinguished from normal urine by judging color changes with the naked eye. This work is of great significance in guiding the construction of colorimetric agarose gel sensors and expands the applications of nanozymes in the biosensing fields.
研究领域:
生物化学
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医学诊断
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Maoqing Tang,Cong Qi,Linfei Yue
As an environmentally friendly seawater desalination method, solar interface evaporation is considered to be a promising solution to ease the freshwater shortage. In this paper, porous Cu-Fe 3 O 4 /sodium alginate/polyacrylamide hydrogel was prepared by double chemical crosslinking method using sodium alginate, polyacrylamide and Cu-Fe 3 O 4 nanoparticles with good SPR effect as raw materials. The effects of Cu-Fe 3 O 4 nanoparticle concentration, light intensity and salt water concentration on the evaporation performance of hydrogel evaporator were studied. It was found that under the light intensity of 1 sun, the evaporation efficiency and thermal efficiency of 3.5 wt% seawater in the hydrogel evaporator containing Cu-Fe 3 O 4 nanoparticles with a concentration of 0.26 % can reach 64.7 % and 95.24 %, respectively. In addition, the Cu-Fe 3 O 4 /sodium alginate/polyacrylamide hydrogel evaporator has good reusability and salt self-cleaning ability. The seawater desalination experiment in real environment shows that the hydrogel evaporator with low cost benefit has broad application prospects in the field of seawater desalination.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 13
·135502
·
IF 3.404
Xiufeng Wu,Wenbo Lu
It is highly attractive to construct stable enzyme-free glucose sensors based on three-dimensional direct electrochemical detection of glucose. In this paper, a copper 7,7,8,8-tetracyanoquinodimethane (Cu(TCNQ)) nanorod array on Cu foam (Cu(TCNQ) NA/CF) is proposed as an efficient catalyst for electrochemical glucose oxidation in alkaline conditions. When Cu(TCNQ) NA/CF was used as the enzyme-free sensory of glucose, the sensor showed a response time within 3 s, a wide linear detection in the range 0.001–10.0 mM, the minimum limit of detection was as low as 10 nM (S/N = 3), and it had a high sensitivity of 26 987 μA mM−1 cm−2. Moreover, this sensor also possesses long-term stability, high selectivity, reproducibility, and actual applications for fresh human serum sample analysis is also successfully accepted.
研究领域:
生物传感技术
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材料科学
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分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yonglong Huang,Zhengkang Duan,Chuan Li,Tian Qiu
The catalytic dehydrogenation of diethanolamine to prepare iminodiacetic acid has attracted considerable research interest. However, the lack of understanding of the structure-activity relationship of the reaction can present a challenge to the control of the catalytic behavior. Concurrently, improving the catalytic performance and reducing the cost have also become urgent issues that require resolution. This work examined the catalytic mechanism of several Cu-Ni X /ZrO 2 catalysts, differing in Cu/Ni ratios, prepared by H 2 reduction, in the context of DEA dehydrogenation to elucidate the structure-activity connection and probable reaction mechanism. Subsequently, a strategy has been put out to generate metal (Ni and Co)-doped copper-zirconium catalysts using the co-precipitation-hydrazine hydrate reduction process. The synergistic effect between metals was combined with the improvement of the surface reaction of the catalyst by hydrazine hydrate through a more efficient preparation method, thereby enhancing the catalyst's overall performance. The representative catalyst Cu-Ni/ZrO 2 required a hydrazine hydrate reduction temperature and time of 40 °C and 30 min, and after 65 min of reaction, it exhibited a high conversion rate (96.3 %) and yield (93.7 %), and after five cycles, both the conversion rate and yield exceeded 85 %. Various characterization techniques have confirmed that Ni doping induced an alloying effect and a size effect. Additionally, the hydrazine hydrate reduction method was discovered to augment the specific surface area, surface hydroxyl groups, hydrophilicity, and optimize the pore size distribution of the catalyst while also regularizing its morphology, thereby significantly enhancing the activity and stability of the metal-doped copper-zirconium catalyst. This paper discussed the correlation between catalyst structure and reaction performance, as well as the catalytic conversion mechanism, which is anticipated to provide a novel reference for the preparation, performance control, and potential applications of dehydrogenation catalysts.
研究领域:
催化化学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Pengchao Ren,Zhenzhou Zhang,Tingting Hu,Zhihui Fan,Shanshan Dang,Sifan Cheng,Weifeng Tu,Yi-Fan Han
Graphical The apparent rate coefficients for CH 3 OH synthesis from CO hydrogenation are a single-valued function of the CO 2 -to-CO ratio in the contacting gas phase, because this ratio determines the extent of surface oxidation of Ce 2 O 3 to CeO 2 , the relative abundance of surface Ce 3+ , and in turn the density of Cu 0 -Ce 3+ sites pair on the working Cu/CeO 2 catalyst. This study investigated the dynamic structure of a working Cu/CeO 2 catalyst and its catalytic consequences for CH 3 OH synthesis via CO hydrogenation by kinetics, high-precise chemical titration, and a series of in situ X-ray spectroscopies. We have revealed that the apparent rate coefficients for CH 3 OH synthesis from CO hydrogenation are a single-valued function of the CO 2 -to-CO ratio in the contacting gas phase. This ratio determines the extent of surface oxidation of Ce 2 O 3 to CeO 2 , the relative abundance of surface Ce 3+ and Ce 4+ sites, and in turn, the density of Cu 0 -Ce 3+ sites pair on the working Cu/CeO 2 catalyst, although the chemical state of Cu and elemental distribution of both Cu and Ce were insensitive to the ratio. The reactivity of CH 3 OH formation and the Cu 0 -Ce 3+ sites decrease monotonously with an increase in the CO 2 -to-CO ratio. The direct connection of the reactivity and the oxidant-to-reductant ratio appears to be general for heterogeneous catalysis, for which the oxidant oxidizes metal atoms. In contrast, the reductant scavenges surface oxygen atoms, thus dictating the density of surface sites and their thermodynamic activities.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 9
·1912
·
IF 2.8
Bowen Lu,Huiying Sang,Liang Liu,Zhijian Yu,Yaqin Guo,Yongqing Xu
The catalytic applications of micron Cu powder are limited due to its large particle size and small specific surface area. Modifying micro-Cu powder to achieve a high catalytic performance is a challenge in the application of micron copper. In this work, micro-Cu was used to synthesize a CeO2–Cu catalyst, and the phase composition and surface pore structure were analyzed using XRD, BET, etc. The CO2hydrogenation performance of the CeO2–Cu catalyst was analyzed in comparison with CeO2and Cu, and we found that the CeO2–Cu catalyst exhibited a synergistic effect between Cu and cerium, resulting in a much higher hydrogenation performance at 500 °C than CeO2or Cu alone. H2-TPR and TEM characterization revealed that the CeO2–Cu catalyst formed interfacial interactions with a relatively large Ce–Cu interface, where cerium oxide could promote the reduction of CuO and lower the reduction temperature. Additionally, cerium oxide formed a confinement structure for Cu, and the CeO2–Cu catalyst exhibited a higher oxygen vacancy concentration, thereby promoting the CO2hydrogenation performance. Cu–CeO2interaction provides valuable insights into the catalytic application of micron Cu powder.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2020
·
IF 0
Li You,Zhili Li,Quanying Ma,Shiyang He,Qidong Zhang,Feng Wang,Guoqiang Wu,Qingyi Li,Pengfei Luo,Jiye Zhang,Jun Luo
Recent advances in high-throughput (HTP) computational power and machine learning have led to great achievements in exploration of new thermoelectric materials. However, experimental discovery and optimization of thermoelectric materials have long relied on the traditional Edisonian trial and error approach. Herein, we demonstrate that ultrahigh thermoelectric performance in a Cu-doped PbSe-PbS system can be realized by HTP experimental screening and precise property modulation. Combining the HTP experimental technique with transport model analysis, an optimal Se/S ratio showing high thermoelectric performance has been efficiently screened out. Subsequently, based on the screened Se/S ratio, the doping content of Cu has been subtly adjusted to reach the optimum carrier concentration. As a result, an outstanding peak zT~1.6 is achieved at 873 K for a 1.8 at% Cu-doped PbSe0.6S0.4 sample, which is the superior value among the n-type Te-free lead chalcogenides. We anticipate that current work will stimulate large-scale unitization of the HTP experimental technique in the thermoelectric field, which can greatly accelerate the research and development of new high-performance thermoelectric materials.
研究领域:
材料科学
·
热电学
✓ 已验证
DOI
Surfaces and Interfaces
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2024
·
IF 5.7
Shaoxi Zhang,Xiangnan Chen,Zhiyong Zhang,Xiaolong Song,Guangjun Gou
Nowadays, the practical application of electromagnetic absorbing materials required lightweight, high efficiency and especially broadband. Wherein, graphene-based electromagnetic absorbing materials had received extensive attention. The conventional design was to introduce magnetic particles onto graphene, but often lead to narrow bandwidth, hard to regulate, due to the lack of intrinsic coupling between magnetic particles and dielectric graphene. In principle, defect engineering could induce intrinsic ferromagnetism into graphene while increasing dielectric polarization loss, could be an effective means of expanding and regulating electromagnetic absorbing bands. Thus, in this paper, Cu/Fe 3 O 4 heterogeneous nanospheres was constructed onsite defect-rich graphene to realize broadband electromagnetic absorbing modulation. The optimal RL value of Cu/Fe 3 O 4 /GE could reach −45.5 dB with obvious multi-band absorption, which was mainly attributed to the synergistic enhancement of defect-induced polarization loss, multiple interfacial polarization loss, as well as collaborative multipath magnetic loss. This work provides reference way for lightweight multi-band electromagnetic absorbing materials design.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2017
·Vol. 122
·期 2
·1129-1143
·
IF 1.264
Hou Miaomiao,Jiang Hong,Liu Yefei,Chen Rizhi
The work aims to investigate the role of initial water content in the glycerol hydrogenolysis to 1,2-propanediol over Cu–ZnO in depth by characterizing the fresh and spent catalysts in detail with ICP, XRD, XPS, EDS, HRTEM, N 2 sorption, N 2 O chemisorption, H 2 -TPD and NH 3 -TPD. The glycerol conversion and 1,2-propanediol selectivity gradually reduce simultaneously with increasing initial water content. At higher initial water content, more CuO are formed, bringing about a decrease in the 1,2-propanediol selectivity. The sizes of Cu and ZnO crystallites increase tremendously with increasing initial water content, lowering the active surface area and acidity. Furthermore, the surface Cu content reduces along with the increase of surface Zn content at higher initial water content. The two aspects make a decrease in the glycerol conversion. This work would aid the glycerol hydrogenolysis to 1,2-propanediol over Cu–ZnO with high catalytic efficiency.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Pengchao Si,Chunyang Duan,Mengqi Li,Zenghua Zhao,Dong Zhao,Yunfa Chen,Yu Wang
Two-dimensional materials have been extensively investigated in the fields of electrochemical sensors, field-effect transistors, and other electronic devices due to their large surface areas, high compatibility with device integration, and so on. Conventional electrodes, such as precious metal layers that are deposited on polymer or silicon wafers, have gradually revealed increasing difficulties in adapting to various device structures, especially for two-dimensional materials, which prefer high exposure of surface atoms. Here, we demonstrate a tailorable metal–ceramic (Cu-TiC0.5) layered structure as novel electrodes with high mechanical property and conductivity and fabricate a highly sensitive gas sensor with graphene lying on this proposed electrodes. The Cu-TiC0.5 layered structure exhibits remarkably high tensile yield strength and compressive yield strength, which increase 7 and 8 times than those of the pure copper, respectively. Meanwhile, excellent flexibility and conductivity could also be obtained with the further thinning of the Cu-TiC0.5 layered composite, which shows its potential applications in flexible electronics. Finally, we demonstrated that a graphene-based gas sensor fabricated on tailored metal–ceramic electrodes was ultrasensitive and robust, which benefits from the good thermal conductivity and peculiar gas channels etched on the surface of copper alloy electrodes.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 4
·978
·
IF 4.412
Peng Liu,Hui Ruan,Tiantian Li,Jiaqi Chen,Fuqiu Ma,Duoqiang Pan,Wangsuo Wu
The low cost β-zeolite and ethylenediamine modified β-zeolite (EDA@β-zeolite) were prepared by self-assembly method and used for Cu(II) removal from contaminated aqueous solution. Removal ability of β-zeolite toward Cu(II) was greatly improved after ethylenediamine (EDA) modification, the removal performance was greatly affected by environmental conditions. XPS results illustrated that the amide group played important role in the removal process by forming complexes with Cu(II). The EDA@β-zeolite showed desirable recycling ability. The finding herein suggested that the proposed composite is a promising and suitable candidate for the removal of Cu(II) from contaminated natural wastewater and aquifer.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）