ACS Applied Nano Materials
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2024
·
IF 5.3
Peng Bo Niu,Yong Qiong Wang,Rong Hu,Tong Yang
With the improvement of the quality of life, the assessment of total antioxidant capacity (TAC) has attracted much attention in the field of a healthy diet, food analysis, or health guidelines. In this work, Cu nanoparticles (NPs)/CoO/carbon nanofibers (CNFs) as a promising nanozyme for peroxidase (POD) mimicking was synthesized by electrospinning and carbonation. Subsequently, a colorimetric sensing platform is constructed for TAC assessment by using 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogenic substrate based on Cu NPs/CoO/CNFs under presence of H2O2. The enhanced POD catalytic efficiency of Cu NPs/CoO/CNFs for TMB oxidation (ox-TMB) was about 3.2-fold higher than that of bare Cu NPs/CNFs or CoO/NFs, which was ascribed to the synergistic catalytic effect and the generation of heterogeneous interfaces between Cu NPs and CoO in CNFs. When some antioxidants such as AA, FA, TA, and GA were introduced in the chromogenic system, ox-TMB was reduced to colorless TMB, allowing the subsequent assessment of TAC. The results show that the limits of detection toward AA, FA, TA, and GA were 8.7, 8.3, 2.7, and 2.4 μM, respectively. Moreover, this proposed method was used for the TAC assay in real samples including fresh juices and commercial beverages, which showed good promise in practical applications such as food nutrition assessment, food analysis, personalized nutrition intervention, or staple food research.
研究领域:
材料科学
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分析化学
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食品科学
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生物技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jinfan Yang,Zhengqing Li,Xiaoru Niu,Ji Xu,Ning Shang,Wenxi Lei,Hao Wu
Developing a sustainable, efficient, and cost-effective heterogeneous catalyst for advanced oxidation processes is challenging in wastewater remediation. Herein, chitosan intercalated CoFe-layered double hydroxide was first employed as a precursor to fabricate a novel CoFe 2 O 4 -CoO/N-doped carbon composite (CoFe-LDO/NC) via a simple “in-situ coprecipitation-calcination” method. The resulting CoFe-LDO/NC was carefully characterized and employed to degrade tetracycline (TC) with the assistance of peroxymonosulfate (PMS). Under the optimum conditions (30 mg L −1 TC, 0.4 g L −1 catalyst, 0.4 g L −1 PMS, pH = 5), the degradation efficiency and mineralization degree reached 97.6% and 60.7% within 30 min, respectively. The superior activity of CoFe-LDO/NC was ascribed to its well-dispersed metal nanoparticles , large specific surface area (230.7 m 2 g −1 ), hierarchical porous structure, and intensified electron transfer efficiency. The quenching test revealed that both the sulfate radicals and singlet oxygen were the dominant active species in the system. The degradation mechanism and TC evolution route were speculated by X-ray photoelectron spectroscopy and liquid chromatography-mass spectrometry. Escherichia coli growth inhibition test exhibited remarkable detoxification of TC solution after degradation. Moreover, CoFe-LDO/NC could be easily collected by magnetism , and 94.3% of its original activity was retained after five cycles. This work offers a green and scalable approach for the rational design of heterogeneous Co-based catalysts for degradation.
研究领域:
环境科学
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材料科学
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化学工程
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废水处理
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催化
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Zhichao Jiao,Yuanqing Chen,Miao Du,Muslum Demir,Fuxue Yan,Weimin Xia,Ying Zhang,Cheng Wang,Mengmeng Gu,Xiaoxuan Zhang,Juntao Zou
The research on the structure of advanced electrode materials is significant in the field of supercapacitors . Herein, for the first time, we propose a novel 3D/3D composite structure by a multi-step process, in which 3D hollow NiCo LDH nanocages are immobilized on 3D sea urchin-like CoO microspheres . Results show that the 3D CoO acts as an efficient and stable channel for ion diffusion, while the hollow NiCo LDH provides abundant redox-active sites. The calculated results based on density function theory (DFT) show that the CoO@NiCo LDH heterostructure has an enhanced density of states (DOS) near the Fermi level and strong adsorption capacity for OH − , indicating its excellent electrical conductivity and electrochemical reaction kinetics. As a result, the CoO@NiCo LDH electrode has an areal specific capacity of 4.71C cm −2 at a current density of 3 mA cm −2 (440.19C g −1 at 0.28 A g −1 ) and can still maintain 88.76 % of the initial capacitance after 5000 cycles. In addition, the assembled hybrid supercapacitor has an energy density of 5.59 mWh cm −3 at 39.54 mW cm −3 .
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 13
·8079-8090
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IF 4.22
Liu Jiali,Yang Qiang,Liu Jikai,Luo He’an
Tungsten trioxide (WO 3 ) has been conceived as a promising photoanode material for photoelectrochemical (PEC) water oxidation. Therefore, many efforts have been made to improve its PEC performances. Herein, a novel heterojunction is fabricated through combining rocksalt CoO (R-CoO) or blende CoO (B-CoO) nanosheets with WO 3 nanoplates using a spin-coating method. The typical type II heterojunctions, e.g., WO 3 /R-CoO and WO 3 /B-CoO, both have exhibited higher photocurrent densities than pristine WO 3 photoanode. The photocurrent densities of WO 3 /R-CoO, WO 3 /B-CoO and WO 3 are 0.53 mA cm −2 , 0.45 mA cm −2 and 0.31 mA cm −2 at 1.23 V vs. reversible hydrogen electrode, respectively. For the WO 3 /R-CoO photoanode, the surface charge separation efficiency is 50.95% and the photoconversion efficiency is 0.062%, which are both higher than the WO 3 and WO 3 /B-CoO photoanodes. The enhanced PEC performances are due to the type II heterojunction between WO 3 and R-CoO (or B-CoO), which facilitates the absorption of visible light and charge transport. The better performance of WO 3 /R-CoO than that of WO 3 /B-CoO may be due to the deeper valence band position of R-CoO. Our work demonstrates that R-CoO (or B-CoO) can couple with WO 3 to form a type II heterojunction to improve the PEC water oxidation performance.
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产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
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2024
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IF 5.3
Jing Jiang,Siyu Deng,Wenhao Kuang,Li Wang,Dong Chen,Yuhong Ma,Wantai Yang
Halloysite nanotubes (Hal) have drawn intensive attentions because of their unique nanotubular structure and large surface area. However, limited adsorption capacity and poor recyclability severely impeded their practical application for water remediation. Herein, to overcome the deficiencies of pristine Hal, we deliberately designed and prepared a series of anhydride and carboxylate functionalized Hal (Hal@PDM-COO − ) via self-stabilized precipitation polymerization. Owing to the merits of both nanotubular structure of Hal and high-density carboxylate ions in the shell layer, the Hal@PDM-COO − possessed a remarkable pH-dependent adsorption performance towards methylene blue ( b -MB). As the solution pH increased from 3 to 11, the sorption capacity increased remarkably from 179.1 to 459.1 mg/g. Furthermore, all sorption processes were better-fitted with pseudo-second-order and Langmuir models, exhibiting a maximum sorption amount of 302.1 mg/g at pH = 7. These results indicate that electrostatic attraction between positive b -MB molecules and negative carboxylate groups plays a dominant role during sorption process, and carboxylate groups distribute homogeneously in the shell layer of Hal@PDM-COO − . More importantly, Hal@PDM-COO − possessed outstanding recyclability, and the removal rate of b -MB kept >95% after five recycle runs. Considering the highly enhanced adsorption capacity, rapid adsorption rate and excellent reusability, the Hal@PDM-COO − showed significant potential for wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 24
·8445-8457
·
IF 5.721
Kun Liu,Yichen Zhao,Jiale Wang,Qingsong Xue,Guofeng Zhao
The fabrication of qualified catalysts is a key issue to implement gas-phase aerobic alcohol oxidation but necessarily requires understanding the structures of catalytic active sites and the supply of active oxygen species. Herein, we present one example of the Ag–CoO/Ti- powder catalyst for gas-phase benzyl alcohol aerobic oxidation. The first interesting observation is that the Ag–Co3O4 ensembles on the fresh catalyst could be transformed into Ag–CoO due to the presence of reductive benzyl alcohol. The preferred catalyst with 3 wt% Ag and 3 wt% CoO exhibits 93% benzyl alcohol conversion and 99% benzaldehyde selectivity at a weight hourly space velocity of 20 h−1 and a temperature of 240 °C. The structures of Ag–CoO ensembles and oxygen species supply were probed and identified by electron microscopy and other spectroscopy techniques in combination with temperature-programmed thermal analyses, pulse experiments, and kinetic studies. In nature, the oxygen species is generated at the Ag–CoO interfacial sites in the form of atomic oxygen with appropriate chemisorption strength on these sites to achieve a high oxidation activity of benzyl alcohol. Moreover, the Co3O4 ↔ CoO cycle is promoted by Ag at low temperature such as 240 °C to endow the Ag–CoO ensembles with excellent catalytic performance.
研究领域:
催化化学
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材料科学
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物理化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ni Su,Hefan Zhang,Xueying Wang,Chunlan Xu,Qiaozhi Yan,Daiqiong Yang,Yahong Zhou,Changyu Lu
Herein, carbon quantum dots (CQD) and CoO nanoparticles were loaded as double heat sources in the hollow porous sponge g-C 3 N 4 with photothermal effect, and the CQDs/CoO/PMSCN Z-scheme heterojunction photothermal assisted photocatalytic system was constructed. Meanwhile, a series of characterization and DFT calculations were used to reveal the electron transfer mode inside the heterojunction. The photocatalytic degradation activity was enhanced by coupling the photothermal effect of multiple heat sources with the electron transfer in the heterojunction, and CQDs-2/CoO/PMSCN exhibited a TC degradation rate of 94.7 % after 90 min of light reaction. Notably, after five cycles of experimentation, the degradation rate decreased by only 4 %, demonstrating the material’s good stability and reusability. Additionally, the unique three-dimensional hollow porous structure of PMSCN allows incident light to penetrate and undergoes multiple reflections/refractions. This not only improves the light response range, but also provides certain thermal insulation, reducing heat loss. Finally, the ECOSAR assessment and bean sprout experiments indicated that TC degradation proceeded towards lower toxicity and non-toxicity. These findings highlight the effectiveness of CQDs/CoO/PMSCN for the treatment of antibiotic contamination, maximize energy utilization, and offer new insights for the practical application of CQDs.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 32
·15712-15722
·
IF 3.925
Wen Xu,Yuan Ma,Xinjia Wei,Honghui Gong,Xiuge Zhao,Yuxi Qin,Qingpo Peng,Zhenshan Hou
A new strategy has been proposed for synthesizing Co@CoO core–shell nanoparticles with a core–shell structure, which involves a facile solvent-thermal process in deep eutectic solvents (DESs). In contrast to the irregular sheet-like packing material obtained in water, twinned and 3D-ellipsoid-shaped nanoparticles were achieved in choline chloride (ChCl)/glycerol and ChCl/PEG-300, respectively. It was found that the nanoparticles were featured as metal Co(0) cores homogeneously wrapped by CoO shells after reduction under a H2 atmosphere. The Co@CoO core–shell nanoparticles showed good activity and stability for the hydroformylation of olefins, and the conversion of 1-octene can reach 99% at 130 °C under 4 MPa (CO/H2 = 1) pressure, and the selectivity to C9 aldehydes was reached up to 97%. The characterization by XPS, H2-TPR and HRTEM indicated that metal Co(0) species could be an active site for hydroformylation of olefins. Notably, the leaching of cobalt carbonyl species was highly dependent on the surface molar ratio of Co2+/Co0 as revealed by XPS spectra, and the surface CoO layer played an important role in suppressing the loss of active Co species in hydroformylation of olefins. Moreover, the core–shell nano-catalysts are easily separated magnetically from the reaction mixture and showed good recyclability in nine consecutive catalytic runs.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Weimo Li,Meixuan Li,Ce Wang,Yen Wei,Xiaofeng Lu
Rational design of highly efficient electrocatalyst for oxygen evolution reaction (OER) is essential to construct high-performance energy devices. In this study, we have developed an electrospinning, in situ polymerization and carbonization process to fabricate Fe doped CoO/C (Fe-CoO/C) nanofibers as efficient OER electrocatalysts. In the synthesized Fe-CoO/C nanofibers, ultrathin carbon layer can be used as conductive network to promote electron transfer and thus improve the electrocatalytic activity. At the same time, additional active sites, like bridged site, formed by Fe doping, also provides the catalyst excellent electrochemical activity in OER. The as-prepared Fe-CoO/C nanofibers exhibit an excellent OER activity with an overpotential of 362 mV at the current density of 10 mA cm −2 in an alkaline medium, which is comparable with the commercial RuO 2 catalyst. After 2500 cyclic voltammograms (CVs) cycles test, the catalyst still maintains the initial electrocatalytic activity, demonstrating a great durability. This strategy introduces both carbon layer and Fe doping to increase the conductivity and the density of active sites of CoO nanofibers, thus enhancing the electrocatalytic activity and stability. This work offers an efficient route to develop low-cost and highly active transitional metal oxide-based OER electrocatalyst for potential renewable electrochemical energy conversion and storage.
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Dan-pu Zhao,Zhi-kun Peng,Shuai Wei,Qing-Qing Pang,Qiao-yun Liu,Zhong-yi Liu
Heterogeneous interfaces are an effective strategy to modulate interfacial properties and enhance catalytic functionality. However, their dynamic evolution under reaction conditions remains elusive, hindering rational catalyst design. Herein, we report a ReS2-CoO/CoS2 heterostructure to investigate its structural transformation under electrocatalytic water splitting conditions, as well as to modulate its activity and stability. Electrochemical measurements reveal exceptional bifunctional catalytic activity, with overpotentials of 25 mV for HER (at 10 mA·cm⁻²) and 241 mV for OER (at 50 mA·cm⁻²). The synergistic interfacial interaction substantially enhances the kinetic processes. The integrated interface between CoO and CoS2 on ReS2 not only ensures intimate electronic coupling but also facilitates abundant surface defect formation, as confirmed by FTIR, XPS, and EPR analyses. In-situ Raman spectroscopy demonstrates structural robustness during HER, whereas a significant surface reconstruction occurs during the OER, in which the initial CoO/CoS2 phase transforms into CoO/CoOOH, serving as the new active species. The catalyst achieves efficient overall water splitting performance (1.43 V at 10 mA‧cm⁻2) with sustained performance. These findings offer valuable insights into interfacial engineering strategies for the rational design of advanced electrocatalysts.
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Yun Zhang,Shihua Ding,Tianxiu Song,Yingchun Zhang
CoSnNb 2 O 8 ceramic with medium-permittivity was initially generated. Compositionally induced phase formation was identified by X-ray diffraction. Tetragonal rutile-type CoSnNb 2 O 8 was obtained from the reaction of SnO 2 with intermediate phase CoNb 2 O 6 . Both the dielectric constant ε r and quality factor Q × f initially increased with the sintering temperature, reaching the maxima at around 1225 °C, and declined thereafter. They were discussed based on the ionic polarizabilities and packing fraction, respectively. The temperature coefficient of resonant frequency τ f primarily depended on the Nb-site bond valence, as well as oxygen octahedra distortion. When sintered at 1225 °C, the CoSnNb 2 O 8 ceramic exhibited optimum properties with ε r = 31.8, Q × f = 43,000 GHz, and τ f = 35.01 ppm/°C.
研究领域:
材料科学
·
无机非金属材料
·
介电物理
·
功能陶瓷
·
微波材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Beiyang Guo,Jianfeng Ma,Yichao Shi,Kewen Zheng,Minghong Wu,Guofa Ren,Sridhar Komarneni
Here in, a system of Co 3 O 4 /CoO catalyst activated with the aid of bisulfite (NaHSO 3 ) was established for the decomposition of methylene blue (MB). The Co 3 O 4 /CoO material was designed by a two-step uniform precipitation and calcination method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectroscopy to detect the crystallinity, morphology, magnetic ability, element valence and the different types of free radicals, respectively. The efficient degradation of MB relies on the synergistic effect between the Co 3 O 4 /CoO catalyst and bisulfite (NaHSO 3 ) to generate some strongly oxidizing radicals, which could achieve a MB degradation rate of 90.7% within 40 min using this novel system. Additionally, the ferromagnetic property of Co 3 O 4 /CoO catalyst is expected to supply an excellent magnetic separation ability to help separate the solid catalyst from the aqueous solution. The novel catalyst system of Co 3 O 4 /CoO/NaHSO 3 may serve as a promising new system for wastewater treatment.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）