JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 3
·591-599
·
IF 1.385
Li Yanyan,Na Wei,Wang Hua,Gao Wengui
A series of Au–CuO/SBA-15 catalysts with 1–3 wt% Au and 30 wt% CuO were successfully prepared for CO 2 hydrogenation to methanol by chemical reduction and the following impregnation. The influence of Au content on the physicochemical properties of Au–CuO/SBA-15 catalysts was investigated in terms of ICP-AES, N 2 physisorption, XRD, TEM, N 2 O titration, XPS and H 2 –TPR technique. The results showed that the as-prepared Au–CuO/SBA-15 catalysts exhibited higher catalytic activity than CuO/SBA-15 catalyst. 2 % Au–CuO/SBA-15 catalyst showed the best catalytic activity with 13.5 % methanol selectivity and 24.2 % CO 2 conversion for CO 2 hydrogenation to methanol. The addition of Au NPs played an important role in improving the catalytic activity for CO 2 hydrogenation to methanol, which may be attributed to the interaction between Au and CuO.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PEST MANAGEMENT SCIENCE
·
2024
·
IF 3.8
Qiulan Xia,Maoyang Ran,Lihe Zhou,Zhongwei Liu,Lin Cai
BACKGROUND Ralstonia solanacearum , a notorious and refractory bacterial plant pathogen, threatens multiple vegetable crops and causes significant economic loss in agriculture. Long-term use of traditional medicines not only increases the problem of drug resistance, but also causes great environmental pollution. Therefore, there is an urgent need to develop new agents with high efficacy and low toxicity. RESULTS In this study, we have synthesized and characterized graphitic carbon nitride incorporated copper oxide composite (g-C 3 N 4 @CuO), which showed higher antimicrobial effect than graphitic carbon nitride nanosheets (g-C 3 N 4 nanosheets) and copper oxide nanoparticles (CuONPs). Ralstonia solanacearum exposed to g-C 3 N 4 @CuO exhibited higher levels of oxygen toxicity, cell membrane damage, DNA damage, motility disruption and even cell death compared to g-C 3 N 4 nanosheets and CuONPs. In addition, g-C 3 N 4 @CuO was more effective in the control of tobacco bacterial wilt than g-C 3 N 4 nanosheets and CuONPs. CONCLUSION Thus, this study provides a new perspective on g-C 3 N 4 @CuO control of bacterial diseases in crops, and the mechanism is related to the destruction of cell membrane damage and motility disruption. © 2024 Society of Chemical Industry.
研究领域:
植物病理学
·
微生物学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Aditya Jain,Y.G. Wang,N. Wang,F.L. Wang
CuO doped Ba 0.8 Sr 0.1 Ca 0.1 Ti 0.95 Zr 0.05 O 3 (BSCTZ) ceramics were prepared by a modified mechano-chemical activation technique with the aim of improving energy storage properties for ceramic capacitor applications. CuO can effectively improve the microstructural characteristics along with a transformation of BSCTZ from classical ferroelectric to relaxor, which is the prime requirement for obtaining high discharge energy density and energy efficiency. The effect of CuO doping on the microstructural, ferroelectric, dielectric, and piezoelectric properties have been systematically studied. The study reveals that an appropriate amount of CuO doping can significantly enhance the morphological properties along with improvement in material density, which is very beneficial in a material for attaining improved energy storage performance. The BSCTZ sample with 3 mol% CuO doping has shown a highly dense microstructure, high saturation polarization (33.01 μC/cm 2 ), low remnant polarization (6.74 μC/cm 2 ), ultrahigh discharge energy density (1.81 J/cm 3 ) and high energy efficiency (81.9%). The CuO doping in BSCTZ has also led to a slight improvement in breakdown strength and electromechanical properties compared to pure BSCTZ ceramics, which is mainly attributed to excellent density and optimum grain size of the material.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 4
·661-664
·
IF 1.248
Yi Ting,Li Jingwei,Zhang Yibo,Yang Xiangguang
Hollow-ZSM-5 was synthesized by a traditional hydrothermal method without alcohol, and a novel na-no-sized Ce-Cu/hollow ZSM-5 sample was prepared by conventional incipient wetness impreganation. The catalysts were characterized by TEM, SEM, XRD, NMR and N 2 adsorption-desorption. The results indicate that the hollow-ZSM-5 has a good MFI structure with large surface area. The synthesized CeO 2 -CuO/hollow ZSM-5 showed an excellent catalytic activity for NO x conversion(90% NO x conversion were obtained) in the temperature range of 340–550 °C under GHSV=480000 mL·g ‒1 ·h ‒1 due to its appropriate redox ability and acidity.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 9
·3693-3701
·
IF 2.8
Tang Xiao,Wang Zhenwei,Cai Dandan,Shao Qinsi,Qin Ziwei,Liu Yang,Li Wenxian,Li Ying,Zhang Jiujun
Design and synthesis of high-performance and low-cost electrocatalysts for methanol oxidation reaction (MOR) are of great significance in energy conversion applications. In this work, g-NiO/CuO composites with high catalytic performance for MOR are successfully synthesized by a template method using g-C 3 N 4 flakes as the sacrificial template. NiO nanoparticles are dispersed uniformly on the surface of the pine needle-liked CuO substrate, resulting in a synergistic effect which can enhance the electrocatalytic MOR activity and stability of g-NiO/CuO catalysts. The catalyst shows a maximum peak current density of 159 mA cm −2 and also long-term stability. The bimetal-oxide-synergistic strategy in this work highlights a promising way for the design of catalysts with high electrochemical performance for direct methanol fuel cells (DMFCs).
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Huajun Xu,Yaning Zhang,Xinting Liu,Man Xie,Meixuan Wu,Shengyu Shao,Baocheng Zhou,Pengfei Sun,Xiaoping Dong
Advanced oxidation process (AOP) based on persulfate (PS) activation has attracted numerous attentions for antibiotic elimination due to the high stability and low cost of PS. In this work, a non-radical activation of PS by CuO catalyst was developed to efficiently degradation of antibiotics. Employing moxifloxacin (MOX) as model pollutant, the CuO/PS system showed excellent degradation rate for 100 mg L −1 MOX that is 13.2 and 7.7 times higher for than the single CuO and PS, and meanwhile the performance is also much better than the typical AOP heterogeneous catalyst Fe 2 O 3 in both neutral and acidic solutions. The optimization experiments indicate the optimal PS concentration is 2.5 mM, and the CuO/PS system can work in a wide pH range for different MOX concentrations. Furthermore, the CuO catalyst has high structural stability and catalytic durability, and the CuO/PS system has good practicality that can degrade a variety of antibiotics and be used in different aquatic environments. Based on various characterizations, a non-radical PS activation route on the CuO surface was proposed. Finally, toxicity assessment of the detected intermediates implies that the toxicity and the potential risk to the environment were effectively decreased. This work testifies PS can be efficiently activated by CuO through a non-radical pathway and presents superior performance for antibiotic elimination.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Changjiang Qiu,Liqin Zhang,Fengjuan Miao,Bairui Tao,Hui Li,Zengcheng Qiu,Yu Zang
In addition to its low cost and stability, the sensor has numerous environmental sensing application possibilities. In this research, we use a ZnO/CuO structure that is structurally analogous to the PN junction, which speeds up electron flow and increases electrode sensitivity. We next modified the composite's surface with Gold Nanoparticles , so increasing the electrode's active area. We next examined the surface topography and microstructure of our manufactured electrodes using a variety of characterisation analytical methods. Finally, a series of electrochemical and photoelectrochemical studies were conducted to evaluate the Glyphosate sensing characteristics of the electrodes we had created.Testing revealed that the resulting electrodes had high electrical conductivity and, thus, enhanced sensitivity to Glyphosate. When compared to other herbicide sensors, the resulting electrode has a low detection limit and a decent detection range (6.9 μmol L −1 to 230 μmol L −1 ). Our manufactured sensor electrode has the potential to be a very sensitive composite electrode for use in modern herbicide detection sensors.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2017
·
IF 2.659
Shilei Wang,Qin Li,Fengxi Chen,Jun Ke,Rong Chen
Owing to the strongly morphology and size-dependent properties of nanomaterials, developing a simple and eco-friendly approach for controlling synthesis and assembly of hierarchical CuO nanostructures plays a critical role. In this work, we successfully developed an eco-friendly and facile hydrothermal route for controllable synthesis of various morphologies CuO nanostructures, where traditional and toxic additives were replaced by biocompatible 4-(2-hydroxyethyl)-1-piperazineethane-sulfonic acid (HEPES). The growth rate and orientation of CuO nanoparticles were tuned through adjusting the concentration and pH value of HEPES. The XRD pattern, SEM, UV-DRS, and BET indicated CuO nanostructures maintained high purity and excellent crystalline nature and showed more regular morphology and size with enhanced visible light absorption. The analogous photo-Fenton assay demonstrated that the as-prepared CuO nanostructures present enhanced dye removal capability when compared with CuO synthesized in pure water. Furthermore, the antibacterial assay on S. aureus was also investigated, and CuO nanoparticles with smallest size displayed the best antibacterial performance. These results reveal that HEPES shows a remarkable influence on the possible application of as-prepared CuO nanostructures which having great potential in pollutant removal.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Kunlin Li,Jiayu Feng,Xingguang Hao,Xin Song,Changbin Zhang,Ping Ning,Kai Li
In this study, CuO@SiO 2 core-shell catalysts were successfully synthesized and applied to efficiently remove hazardous gaseous pollutant arsine (AsH 3 ) by catalytic oxidation under low-temperature and low-oxygen conditions for the first time. In typical experiments, the CuO@SiO 2 catalysts showed excellent AsH 3 removal activity and stability under low-temperature and low-oxygen conditions. The duration of the AsH 3 conversion rate above 90 % for the CuO@SiO 2 catalysts was 39 h, which was markedly higher than that of other catalysts previously reported in the literature. The considerable catalytic activity and stability were attributed to the protection and confinement effects of the SiO 2 shell, which resulted in highly dispersed CuO nanoparticles . Meanwhile, the strong interaction between the CuO core and SiO 2 shell further facilitated the formation of active species such as coordinatively unsaturated Cu 2+ and chemisorbed oxygen. The accumulation of oxidation products (As 2 O 3 and As 2 O 5 ) on the interface between the CuO core and SiO 2 shell and the pore channels of the SiO 2 shell is the main cause of catalysts deactivation . Furthermore, through combined density functional theory (DFT) calculations and characterization methods, a reaction pathway including gradual dehydrogenation (AsH 3 *→AsH 2 *→AsH*→As*) and gradual oxidation (2As*→As*+AsO*→2AsO*→As 2 O 3 ) for the catalytic oxidation of AsH 3 on CuO (111) surface was constructed to clarify the detailed reaction mechanism. The CuO@SiO 2 core-shell catalysts applied in this study could provide a powerful method for developing AsH 3 catalysts from multiple know AsH 3 removal systems.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 9
·1246
·
IF 3.9
Jianhui Zhao,Huan Li,Yuanzhou Wang,Jingjie Yu,Ning Li,Shaopo Wang
Biochar (BC) usually has abundant surface functional groups, well-developed pore structures and high specific surface areas, which can combine with transition metals for peroxymonosulfate (PMS) activation to degrade organics. In this paper, BC modified with Cu/CuO was prepared by a modified impregnation pyrolysis method using peanut shells as raw materials. The morphology, structure and physicochemical properties were analyzed. Results showed that the originally smooth BC surface was modified into a rough structure with distributed metal particles, and the specific surface area of the modified Cu/CuO-BC700 (i.e., Cu/CuO-BC) increased from the initial 22.57 to 192.64 m2/g. The Cu/CuO-BC was employed for PMS activation and tetracycline (TC) degradation, achieving a removal efficiency of 93.2% at TC initial concentration 20 mg/L, PMS concentration 0.5 mM and catalyst dosage 0.1 g/L after 30 min. The influence of co-existing anions in the actual water on TC degradation followed the order of HCO3−> H2PO4−> Cl−, and HA had an inhibitory effect on TC degradation. A variety of active species participated in TC degradation, and the free radical pathway played a dominant role. Furthermore, the Cu/CuO-BC could maintain the degradation efficiency of TC up to 80% even after five consecutive cycles. The Cu/CuO-BC maintained high activity through redox reactions between catalytically generated active species and the cycling of metal ions (Cu+/Cu2+).Keywords:Cu/CuO;modified biochar;peroxymonosulfate;active species;tetracycline
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaolei Sun,Meiyi Jing,Hong Dong,Wenhe Xie,Feng Luo
Transition metal oxides are said to have the ability to enhance the gravimetric capacity of lithium-ion batteries by two or three times that of current state-of-the-art graphite anodes. Recent reports have demonstrated that the combined utilization of structural architecture and surface modification is an attractive strategy to improve lithium storage capability. In this study, novel CuO-ZnO@Al 2 O 3 submicroflakes were prepared by magnetron sputtering deposition of Cu-Zn alloy films on a removable sacrificial substrate, followed by a facile thermal oxidation treatment and Al 2 O 3 coating procedure by particle atomic layer deposition. They combine the advantages of CuO-ZnO submicroflakes, such as high lithium storage capability and fast lithium ion transportation, and Al 2 O 3 nano-coating with effective protection of the electrode interface during cycling. When utilized as anode materials for LIBs, the CuO-ZnO@Al 2 O 3 submicroflakes exhibit superior specific capacity, enhanced cycling stability, and outstanding rate capability compared with pristine CuO-ZnO submicroflakes, commercial CuO and ZnO powders. The CuO-ZnO@Al 2 O 3 submicroflakes electrodes deliver a high reversible capacity of 814 mAh g −1 at a current density of 50 mA g −1 , and still maintain a moderate capacity of 447 mAh g −1 at a high current density of 1000 mA g −1 . Pairing with a commercial LiFePO 4 cathode, full cell shows high capacity retention and stable cycling performance, suggesting the feasibility of the CuO-ZnO@Al 2 O 3 submicroflakes in practical energy storage applications. In addition, our findings also provide a clear proof-of-concept of the surface coating technique, which might be applied widely to other materials and devices where nano-coating produces desirable properties.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 15
·e202400724
·
IF 1.9
Zekai Zhang,Ding Zhang,Stéphane Abanades,Hanfeng Lu
Graphical A strategy to use high-temperature semiconductor photocatalyst dealing with artificial photosynthesis for CO 2 photothermal reduction with concentrated sunlight was proposed. A CuO/SiC catalyst was accordingly designed and showed extremely high CO 2 photoreduction activity with H 2 O at high temperature. The CH 4 yield reached 2041 μmol ⋅ g −1 at 350 °C with maximum solar energy conversion efficiency of 2.3 %. Artificial photosynthesis can convert CO 2 and H 2 O into hydrocarbons via solar energy. However, the extremely low process efficiency is a major obstacle to this application. The photocatalyst is considered to be the key factor to raise the overall solar energy conversion efficiency. Much research focused on co-catalysts, but less attention has been paid on the high-temperature semiconductor. Herein, a strategy is proposed involving high-temperature semiconductor to design target photocatalyst dealing with the artificial photosynthesis at high temperature. Based upon this strategy, a CuO/SiC catalyst with single atom characteristic was designed, prepared and the activity of CO 2 photoreduction with H 2 O was tested in a high temperature environment. Above 150 °C, the catalyst activity was boosted and unprecedented performance values were attained. Under the irradiation condition delivered by a 1000 W Xe light and at 350 °C, the obtained yields of CH 4 , C 2 H 4 , and C 2 H 6 were 2041.4 μmol ⋅ g −1 , 15.2 μmol ⋅ g −1 , and 63.6 μmol ⋅ g −1 , respectively. The overall CO 2 conversion reached 24.6 % and the maximum solar energy conversion efficiency was 2.3 % without any sacrificed agents. This strategy will be helpful to overcome the current limitations for the industrialization of artificial photosynthesis and accelerate the related research on photothermal catalysis.
研究领域:
化学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）