SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiao Hu,Tiantian Zhao,Xue Li,Guangzhi Hu
The electrocatalytic conversion of nitrate (NO 3 − ) to nitrogen (N 2 ) is a promising strategy for addressing the global issue of NO 3 − pollution in surface water and groundwater. However, the scarcity of efficient denitrification catalysts hinders the development of the aforementioned process, particularly at low NO 3 − concentrations. Herein, a self-supporting array of defect-rich heterostructured nanowires (Ni 0.8 Cu 0.2 O@CuO@NF) was synthesized for highly selective reduction of NO 3 − to N 2 . The introduction of Cu accelerated the rate-limiting step (NO 3 − to NO 2 − ), and the presence of defect-rich heterojunctions increased the catalytic active sites of the catalyst, thereby accelerating the reduction of NO 3 − and improving the selectivity towards N 2 . Ni 0.8 Cu 0.2 O@CuO@NF exhibited excellent denitrification capacity, with approximately 100% of NO 3 − degradation and 99.9% of N 2 selectivity under optimum parameter conditions, as well as ultra-high stability during the 8-cycle test. Significantly, NO 3 − conversion and N 2 selectivity for actual wastewater with complex ingredients were 70.7% and 99.1%, respectively. This study presents a novel concept for the development of cost-effective and highly effective catalysts for water and environmental restoration.
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 PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Xiaoyu Chen,Xiaodong Li,Zhilin Chen,Binqian Wu,Zhuoran Jia,Feilong Gong
Constructing electrocatalysts with heterogeneous interfaces is of great significance for improving the performance of electrocatalytic hydrogen production . In this work, CuWO 4 ·2H 2 O–CuO (P-CWOC) was synthesized by hydrothermal method , and spherical porous CuWO 4 –CuO (CWOC) was obtained through annealing treatment. The size of CuWO 4 –CuO can be controlled from 72 to 221 nm by regulating the supersaturation of the solution. Among them, CuWO 4 –CuO with a particle size of 72 nm (CWOC-72) possesses the most oxygen vacancies and the largest specific surface area . The W atom in the heterostructure of CuWO 4 and CuO can affect the electronic structure of Cu atoms, and the presence of oxygen vacancies is beneficial for increasing the surface oxygen affinity of the composite material. Benefitting from the largest number of oxygen vacancies and the largest specific surface area, the CWOC-72 own the best catalytic performance compared to the other four catalysts. The overpotential at a current density of 10 mA cm −2 is 121 mV, and the Tafel slope is 70 mV·dec −1 . Its excellent stability was confirmed by chronoamperometry , in-situ XRD , and in-situ Raman spectroscopy , and its alkaline HER performance is superior to most CuO-based catalysts.
研究领域:
材料科学
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电催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Sainan Cao,Bingjie Zou,Jingxia Yang,Jinjie Wang,Huangdi Feng
A heterogeneous catalyst CuO–CeO2 with a hollow structure was successfully synthesized by assembling CuO on the outer surface of CeO2 hollow spheres through a layer-by-layer deposition strategy. Further reduction under a H2 atmosphere was carried out to modify its surface state, resulting in sample r-CuO–CeO2. The catalysts were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform-infrared spectroscopy (FT-IR). SEM and TEM showed that the synthesized catalysts had a hollow sphere structure, which can expose more active sites and promote mass transfer. The results of XPS revealed that the content of Cu0&Cu+ increased from 13.6 to 19.0% after H2 reduction, which was conducive to the activation of terminal alkyne to promote the annulation/A3-coupling reaction. The conversion of this cascade reaction with the r-CuO–CeO2 catalyst can reach more than 95%, while the value was only 55% by using CuO–CeO2 as a catalyst. Moreover, the r-CuO–CeO2 catalyst showed a good recycle property and group compatibility in the general applicability of the cascade annulation/A3-coupling reaction, providing a series of propargylamine derivatives in good chemoselectivity.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Chuanqi Pan,Huan Shen,Guoli Liu,Xiang Zhang,Xiaoxuan Liu,Huifeng Liu,Peiyan Xu,Wei Chen,Yuan Tian,Hongtao Deng,Hongwei Sun,Jinlong Wang,Zhu Luo,Lizhi Zhang,Yanbing Guo
Bacterial infection can induce a variety of deadly diseases that seriously threaten human life and health. TiO2 is extensively employed as a broad-spectrum antibacterial photocatalytic material for the inactivation of bacteria. However, a wide-band-gap nature has limited the effectiveness of TiO2 to only the UV-light range. In addition, photogenerated electrons and holes can recombine quickly, inducing low antibacterial efficiency. Here, we fabricated a CuO/TiO2 nanobelt by an impregnation method and introduced surface oxygen vacancies (Ov) to significantly improve their photocatalytic inactivation performance against Staphylococcus aureus. The CuO/TiO2–H2 catalyst contains more Ov and exhibits excellent antibacterial properties against S. aureus. The antibacterial efficiency is 32.2 and 99.4 times those of CuO/TiO2 and bare TiO2, respectively, under light irradiation. The photogenerated electron–hole pairs react with molecular oxygen (O2) and a surface hydroxyl group or water (OH– or H2O), resulting in the formation of an active hydroxyl radical (·OH) and a superoxide radical anion (·O2–). In addition, the surface Ov can effectively reduce the conduction band and act as an electron capture center, thereby promoting the adsorption and activation of O2 and generating more active ·O2– species. This work indicates the efficient antibacterial activity of a CuO/TiO2 nanobelt with Ov and provides a feasible approach for the development of highly efficient antibacterial nanomaterials in the medical field.
研究领域:
材料科学
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生物学
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医学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 5
·2343-2352
·
IF 3.049
Feng Zhao,Shuangde Li,Xiaofeng Wu,Renliang Yue,Weiman Li,Yunfa Chen
CuO–CeO2 nanocatalysts with different amounts of Mn dopping (Mn/Cu molar ratios of 0.5 : 5, 1 : 5 and 1.5 : 5) were synthesized by flame spray pyrolysis (FSP) method and tested in the catalytic oxidation of CO. The physicochemical properties of the synthesised samples were characterized systematically, including using X-ray diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), oxygen-temperature programmed desorption (O2-TPD), hydrogen-temperature programmed reduction (H2-TPR) and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). The results showed that the 1Mn–Cu–Ce sample (Mn/Cu molar ratio of 1 : 5) exhibited superior catalytic activity for CO oxidation, with the temperature of 90% CO oxidation at 131 °C at a high space velocity (SV = 60 000 mL g−1 h−1), which was 56 °C lower than that of the Cu–Ce sample. In addition, the 1Mn–Cu–Ce sample displays excellent stability with prolonged time on CO stream and the resistance to water vapor. The significantly enhanced activity was correlated with strong synergetic effect, leading to fine textual properties, abundant chemically adsorbed oxygen and high lattice oxygen mobility, which further induced more Cu+ species and less formation of carbon intermediates during the CO oxidation process detected by in situ DRIFTS analysis. This work will provide in-depth understanding of the synergetic effect on CO oxidation performances over Mn doped CuO–CeO2 composite catalysts through FSP method.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Binghao Cui,Zhangpan Shen,Jianguo Chen,Shuai Cheng,Jinrong Cheng
0.75BiFeO 3 -0.25BaTiO 3 lead-free ceramics have been considered promising candidates for high-temperature piezoelectric applications. However, their dielectric and piezoelectric properties severely degrade with increasing temperature. In this work, improved dielectric and piezoelectric thermal stability was obtained in CuO-modified 0.75BiFeO 3 -0.25BaTiO 3 ceramics. CuO addition increases the volume fraction of the rhombohedral phase in the 0.75BiFeO 3 - 0.25BaTiO 3 ceramics and makes the chemical heterogeneity disappear. The dielectric and piezoelectric anomalies are eliminated near 300 °C and return with CuO additions, and the temperature degradations of the dielectric constant and piezoelectric coefficient of 0.75BiFeO 3 -0.25BaTiO 3 ceramics with 0.008 mol CuO in the range from 25 to 400 °C decrease by 85% and 60%, respectively. Furthermore, the depoling temperature and piezoelectric coefficient of 0.75BiFeO 3 -0.25BaTiO 3 ceramics with 0.008 mol CuO are 570 °C and 131 pC/N, respectively. These results indicate that CuO addition is an effective approach to improve both the dielectric and piezoelectric thermal stability of 0.75BiFeO 3 -0.25BaTiO 3 ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 28
·12535-12543
·
IF 2.7
Bo Sun,Man Li,Lifeng Cheng,Qijian Li,Xiaowen Chen,Shengqi Wang,Wenhua Yan,Lei Wang,Fuxiang Wei,Qingliang Wang
Transition metal oxides (TMOs) have excellent electrochemical properties. However, they are commonly associated with short cycle lives, agglomeration, and lower electrical conductivity. To ameliorate these drawbacks, porous rod-shaped CuO@Co3O4 has been synthesized through calcination with optimized oxidation temperature by using CuCo-MOF-74 as a template. Due to the porous structure, the CuO@Co3O4 electrode significantly increases the contact area with the electrolyte and greatly improves the reaction kinetics. As a result, the CuO@Co3O4 electrode exhibits excellent electrochemical performance with a specific capacitance of 545.5 F g−1 at a current density of 1 A g−1. The capacitance retention at 10 A g−1 was 88.7% after 10 000 cycles. Furthermore, an asymmetric supercapacitor (SC) has been assembled with CuO@Co3O4 as the positive electrode and commercial reduced graphene oxide (RGO) as the negative electrode, and the device has exhibited an energy density of 38.2 W h kg−1 at a power density of 1268.3 W kg−1. Impressively, the capacitance retention remained 83.2% even after 10 000 cycles at a high current density of 10 A g−1. This performance has demonstrated the potential of CuO@Co3O4 as an anode material for SCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Pengwei Yan,Jimin Shen,Shuyu Wang,Yanchi Zhou,Jing Kang,Lei Yuan,Lanbo Bi,Yabin Li,Zhonglin Chen
CuO as a heterogeneous catalyst was synthesized by calcination method and characterized via various technologies. A series of metal oxides were synthesized by the same process to compare the catalytic performance. The CuO activated peroxymonosulfate (PMS) catalytic system can effectively degrade 2, 6-dichlorophenol (2,6-DCP). The effect of the calcination temperature on CuO performance was investigated, which showed that the catalytic performance was the highest at a calcination temperature of 400 °C. The effect of various factors such as catalyst dose, PMS dose, solution pH, NOM concentration and inorganic ions (Cl − , NO 3 − , SO 4 2− and HCO 3 − ) on the removal of 2, 6-DCP were probed. SO 4 − and OH play the predominant role for the degradation of 2, 6-DCP. According to the kinetic calculation of the quantitive experiment by nitrobenzene and benzoic acid, the generation concentrations of OH and SO 4 − can reach 5.92 × 10 −13 mol/L and 7.92 × 10 −13 mol/L, respectively. The degradation mechanism of 2, 6-DCP main including OH substitution for Cl atom, ring-opening and mineralization.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhijia Liao,Tianyao Qi,Haocheng Li,Zhenyu Yuan,Hongliang Gao,Fanli Meng
The widespread industrial use of styrene highlights the urgent need for detecting and monitoring its harmful gases. The innovation of this study lies in synthesizing uniform Fe 2 O 3 nanoparticles using Ginkgo biloba and calcining them with CuOHF to prepare nanostructured materials, enhancing the performance of gas sensors. The effects of varying α-Fe 2 O 3 additions and calcination temperatures on the structure and gas-sensitive properties of the composites were systematically investigated. The results revealed that the optimal operating temperatures of the CuO–10%Fe 2 O 3 -400 sensor were reduced by 80 and 50 °C, and its response to 100 ppm styrene at 200 °C was significantly enhanced by 3.2-fold and 4.2-fold, respectively, compared to the single Fe 2 O 3 and CuOHF sensors. It is particularly noteworthy that the sensor exhibits excellent detection performance at a 50 ppb styrene concentration, with a response value of 1.2. The lamellar structure of CuOHF serves as a precursor for CuO, thereby increasing the surface area of the sensor in contact with the gas. During the calcination process, the released gases contribute to the formation of a porous structure, which together improves the adsorption capacity and stability of the sensor. Additionally, the heterojunction formed by the calcination of CuO (p-type) and Fe 2 O 3 (n-type) enhances charge transfer and increases gas adsorption capacity, highlighting its potential as a gas sensor. This composite material exhibits good sensitivity and reliability in monitoring hazardous gases like styrene, underscoring the significant value of this study in environmental monitoring and safety control.
研究领域:
材料科学
·
环境监测
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Ai-Ling Hu,Hao-Hua Deng,Xiao-Qing Zheng,Yan-Yu Wu,Xiu-Ling Lin,Ai-Lin Liu,Xing-Hua Xia,Hua-Ping Peng,Wei Chen,Guo-Lin Hong
It is desirable but challenging to assemble various biomimetic properties into a functional catalytic cascade system . In this work, cupric oxide nanoparticles were investigated as oxidase mimics for the aerobic oxidation of cysteine to cystine with the generation of hydrogen peroxide. Coupling this property with the peroxidase-like activity of CuO nanoparticles, we constructed a self-organized cascade reaction system based on a single-component nanozyme , which includes the oxidation of cysteine to yield cystine and hydrogen peroxide and the hydrogen peroxide-mediated oxidation of terephthalic acid to produce a fluorescence change. Based on this artificial enzymatic cascade reaction system, a fluorometric assay method with a low detection limit of 6.6 nM was established for cysteine determination. This platform was then applied for the detection of cysteine in pharmaceutical products and human plasma, which yielded satisfactory results. Our investigations open up a new route and holds promise for the development and applications of multifunctional nanomaterials as enzyme mimics .
研究领域:
生物化学
·
纳米生物学
·
分析化学
✓ 已验证
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2018
·
IF 6.012
Fang Chen,Qi Cao,Chen Dong,Bo Shao,Wei Zhai,Xiaoyan Ma,Bingbo Wei
The extraordinary high pressure and temperature produced during cavitation is crucial for ultrasonic sonochemistry. However, the cavitation effect is usually confined to a small zone nearby the ultrasonic horn, outside of which ultrasound produces much less effects on chemical reaction. In present work, in order to expand the range of effective zone and intensify the cavitation effect, N 2 aeration was introduced to an ultrasonic polymerization process of CuO@PNIPAM in aqueous solution. By increasing the number of bubble nucleus gathered on the CuO surface and lowering the surface tension of the aqueous solution, the cavitation effect is intensified on the CuO surface within the whole reaction vessel, which benefits the covalently bonding between PNIPAM and CuO to a large degree and results in the formation of CuO@PNIPAM hybrid composite with excellent interfacial bonding. It is promising that the hybrid composite can be applied as temperature responsive glucose sensing platform with ON and OFF states due to the wettability change of PNIPAM versus temperature.
研究领域:
材料科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 4
·e202201413
·
IF 4.5
Dandan Zhao,Shaoyang Zhang,Tianyu Guo,Qiang Zhao,Jianping Du,Jinping Li
Graphical Carbon dioxide reduction : The rectangular nanoflakes with crystalline/amorphous phase structures that the square nanoblocks are confined in amorphous nanoflakes efficiently enhance the electrocatalytic conversion of CO 2 to ethylene. The electrocatalytic reduction of CO 2 to high value-added chemicals is one of the effective technologies to achieve the goal of carbon neutralization. However, highly selective production of hydrocarbon via electrochemical conversion of CO 2 still has great challenges. Herein, a unique CuO phase composition is constructed that consists of rectangular nanoflakes possessing crystalline/amorphous structures by the facile strategy. Crystalline CuO square nanoblocks are confined in amorphous nanoflakes and form crystalline/amorphous hybrid phase. The results of electrocatalytic CO 2 reduction demonstrate that this crystalline/amorphous CuO material exhibits superior CO 2 conversion ability with ethylene Faradaic efficiency of 58.3 % at −1.08 V vs. RHE, which is ascribed to nanoflake structures and fast electron transfer on the crystalline/amorphous interfaces because of superior conductivity of amorphous CuO. The present research provides an effective route to reconstruct novel crystalline/amorphous interfaces of CuO for catalysis applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）