MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-14
·
IF 5.3
Guo Qi,Wang Du,Ma Fei,Fang Mengxue,Zhang Liangxiao,Li Peiwu,Yu Li
Phytosterols (PSs), a class of naturally occurring bioactive lipid compounds, have been found to possess a significant cholesterol-lowering effect. In developing countries, the consumption of rapeseed oil is the primary pathway of PS intake for the general population. However, developing low-cost, real-time, and high-throughput screening techniques for PSs remains a challenge. Here, a Cu-based nanocomposite CuOx@C was synthesized via a simple method of the calcination of HKUST-1 and systematically characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The CuOx@C demonstrated excellent peroxidase-like (POD-like) activity, functioning as a peroxidase mimic to facilitate the catalysis of 3,3′,5,5′-tetramethylbenzidine (TMB) into its oxidized form (oxTMB), thereby initiating a discernible color response. On the basis of this discovery, a CuOx@C-based colorimetric method for detecting total sterols in rapeseed was successfully constructed via cascade reactions. After optimizing the conditions, the high-throughput screening of total sterols in rapeseed could be completed in only 21 min, which significantly facilitated the sensing of PSs. A linear range of 0.6–6 mg/g was achieved for the detection of total sterols in rapeseed samples, thereby satisfying the requirements for detection. In addition, due to the high stability of CuOx@C and the specificity of cholesterol oxidase, the developed method had excellent stability and selectivity toward PSs, indicating that this work has huge prospects for commercial application. This innovative work overcomes the limitation of the instrumental method and provides a portable and reliable tool for total sterols detection. It can also facilitate the development of oilseeds with a high content of PSs. Graphical abstract
研究领域:
生物化学
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食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Anbang He,Yong Yang,Qiang Zhang,Ming Yang,Qian Zou,Jun Du,Changyuan Tao,Zuohua Liu
Electrochemical reduction of CO 2 to C2 products on Cu-based catalysts provides a promising approach for controlling the global carbon balance and restoring renewable surplus electricity. The enhanced CO 2 adsorption and CO local concentration are beneficial for CO 2 conversion and C2 intermediates formation, promoting the progress of CO 2 utilization. Here, we report a bimetallic MOF-derived Co 3 O 4 -CuO x /C (M-CuCo/C) catalyst constructed with Co 3 O 4 and CuO x sites wrapped in the carbon skeleton, achieving efficient CO 2 activation and C2 generation under low overpotential. The optimized M-CuCo/C catalyst (Cu/Co ratio of 1:2) exhibits a total current density of 19.28 mA/cm 2 at −1.05 (V vs. RHE), which is 8.60 times than that on MOF-derived CuO x /C (M-Cu/C). The highest C2 faradic efficiency (FE) reaches 79.2% (-0.75 V vs. RHE), accompany with a C2 production rate of 275.6 μmol/(g·h). The special nanorods-like morphology assembled by dual sites significantly increases electrochemical surface area and electron transmission rate during eCO 2 RR. The local CO intermediates under real-time electrochemical environment are monitored via rotation ring disk electrode (RRDE) techniques. Combined with in situ infrared measurements and DFT studies, it’s demonstrated that CO 2 could be efficiently converted to CO under low overpotential on Co 3 O 4 sites, forming local CO-enriched environment around neighboring CuO x sites and further accelerating the process of C2 formation.
研究领域:
化学
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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
Catalysts
·
2022
·Vol. 12
·期 12
·1515
·
IF 4.501
Ding Zhang,Yun-Fei Li,Li-Xue Liu,Lei Duan,Zhi-Li Ren,Shou-Dong Xu,Liang Chen,Hui-Juan Guo,Yi Huang,Li-Juan Shi,Qun Yi
Among clean energy transformation devices, fuel cells have gained special attention over the past years; however, advancing appropriate non-valuable metal impetuses to halfway supplant the customary Pt/C impetus is still in progress. In this paper, we propose a specific electrocatalyst in the formula of highly-active Cu species, associated with coated carbon (Cu@C-800), for oxygen reduction reaction (ORR) through post-treatment of a self-assembled precursor. The optimized catalyst Cu@C-800 showed excellent ORR performance (i.e., the onset potential was 1.00 V vs. RHE, and half-wave potential of 0.81 V vs. RHE), high stability, resistance to methanol, and high four-electron selectivity. The enhancement is attributed to the synergy between the carbon matrix and a high explicit surface region and rich Cu nano-species.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Pengfei Huang,Jiawei Lei,Zhirong Sun,Xiang Hu
Antibiotic contamination has already been one of hazards to aquatic environment due to the abuse of antibiotics. Metal-organic frameworks (MOFs) are known as a kind of promising porous material for solving the environmental deterioration. In this article, the physicochemical and electrochemical properties of a series of porous copper oxide carbon materials (CuOx-C) synthesized by carbonizing Cu-BTC were compared. Due to the suitable carbonization temperature, CuOx-C-550 N, whose geometric structure was similar to Cu-BTC, possessed a multiscale pore structure containing many mesopores and partial macropores in accordance with the pore size distribution curves. More copper/copper oxides were introduced toimproving the electrochemical ability, evidence by XRD , XPS, CV and EIS characterization. Moreover, the degradation of ceftazidime (CAZ) through anodic oxidation was discussed. In AO/CuOx-C-550 N system, the effects of current, solution pH, initial CAZ concentration and Na 2 SO 4 concentration were analyzed. CAZ removal rate reached 100% within 20 min under the optimal condition and a good electrocatalytic ability with 90% CAZ removal after 20 runs indicated a good electrochemical stability of CuOx-C-550 N. Furthermore, the degradation mechanism and pathway of CAZ were proposed. The Cu(II)/Cu(I) oxidation-reduction couples on the anodic surface contribute to the efficiently selective degradation of cephalosporins for CuOx-C-550 N. Overall, this study shows a good method to design and prepare a new MOF derivative for the remediation of aquatic contamination.
研究领域:
环境科学
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材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·8827-8835
·
IF 9.9
Wang Xin,Miao Ming,Tang Bowen,Duan Haotian,Zhu Fulong,Zhang Huigang,Zhang Xian,Yin Wen-jin,Fu Yongzhu
Electrochemical conversion of CO 2 (CO 2 RR) into high-value fuel is identified as one of the promising approaches to achieve carbon neutrality. The synthesis of high-efficiency CO 2 reduction electrocatalysts with high C 2 :C 1 , selectivity remains a field of intense interest. Previous studies have shown that the presence of Cu(I) is beneficial for the reduction of CO 2 into C 2 products. However, the stable presence of Cu(I) remains controversial, especially in the negative potential window. Here we report a simple and easily scalable catalyst precursor Cu 2 (OH) 3 Cl/C, which automatically forms in-situ chlorine-doped Cu/Cu 2 O heterointerface during electrocatalysis. The catalyst not only exhibits a Faradaic efficiency of 33.03% but also provides a long-term stability of Cu + , gaining a stable electrolysis of 11 h, with an ethylene/methane ratio over 50. The experimental results and mechanistic studies confirm that the presence of Cl − inhibits the reduction of Cu + , inducing the formation of Cu 0 /Cu + , and reduces the reaction energy of the intermediate ⋆CO dimerization, thereby facilitating the formation of C 2 products. This work provides a feasible way to synthesize copper ions with long-term and stable positive charge in CO 2 RR and expands a new way to synthesize ethylene industrial products in the future.
研究领域:
材料科学
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电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Ying Duan,Pan Guo,Dong Sui,Dongsheng Deng,Tianliang Lu,Yanliang Yang
The development of a cost-effective catalyst for hydrogen evolution from ammonia borane is of importance for the application of AB as a hydrogen storage material. In this manuscript, a series of noble metal catalysts M@CuOx/C (M = Ru, Rh, Pd, and Pt) are prepared by the galvanic reduction method. The catalysts are characterized by XRD , TEM , EDS mappings and lines scanning, XPS , HAADF-STEM, and ICP-OES. The noble metal is highly dispersed on the surface of Cu nanoparticles . The morphology of Cu nanoparticles changed according to different metals after the introduction of noble metal and there has an interaction between the noble metal and Cu. The M@CuOx/C is used for the hydrolysis of AB. For the same metal catalyst, the activity of M@CuOx/C is increased by about 3–7 times than the corresponding M/C at 298 K. The Rh shows the highest TOF and lowest activation energy among the four noble metals.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）