ACS Applied Nano Materials
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2022
·
IF 6.14
Yu Zhu,Jun Yan,Jing Liu,Haoyu Chen,Jialing Gui,Cuiyan Wu,Xiaohua Zhu,Peng Yin,Meiling Liu,Youyu Zhang,Shouzhuo Yao
Herein, Co3O4 nanopolyhedrons with multi-mimics of peroxidase (POD)-, oxidase (OXD)-, catalase (CAT)-, and glutathione peroxidase (GPx)-like activities were developed and utilized in the application of regulating the level of cellular oxygen and hydrogen peroxide combined with polydopamine (PDA). It was found that the multi-mimic activities can be controlled by pH and the OXD- and POD-like activities were the best when the pH was 4 but became weak under weakly acidic or neutral conditions. Meanwhile, the CAT-like activity was the best under neutral and weakly acidic conditions, and the GPx-like activity was better in neutral conditions than in acidic conditions. According to the high CAT-like activity of Co3O4 nanopolyhedrons under weakly acidic conditions, especially at the tumor cell microenvironment, the Co3O4 nanopolyhedrons can catalytically transform the H2O2 into O2 without interferences from other mimic activities. After coating with PDA, the Co3O4@PDA with good biocompatibility and dispersion can also be catalyzed to produce O2 in the cellular microenvironment with high efficiency. The corresponding H2O2 and O2 fluorescent probes were used to monitor the process, and the main mechanisms were investigated through fluorescence spectra and confocal fluorescence microscopy. This work not only verifies the multi-enzyme properties of Co3O4 nanopolyhedrons but also provides a nanomaterial for the regulation of the content of H2O2 or O2 in cells by utilizing the CAT-like enzyme property of the nanomaterial. It is considered that the concentration variation of the active small molecules in the cell microenvironment regulated by nanoenzymes may provide some basis for cancer diagnosis and treatment.
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
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2022
·Vol. 52
·期 11
·1607-1616
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IF 2.925
Zhang Yi,Zhang Liwen,Gong Tingcui,Li Tianhao,Li Xuenuan,Feng Jun,Tang Tingfan,Cheng Hao
Due to the highly porous structure, metal organic framework (MOF)-derived materials are extensively applied in the field of electroanalysis. In this experiment, an effective electrochemical sensing based on Co 3 O 4 /C-derived ZIF-67 MOF had been constructed for ultrasensitive determination of quercetin at trace level. The resultant Co 3 O 4 /C porous polyhedron of morphology and nanostructure were carefully examined using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) techniques. Differential pulse anodic stripping voltammetry (DPV) method was adopted to analyze quercetin under the optimized conditions. The DPV response of Co 3 O 4 /C film-coated glass carbon electrode (Co 3 O 4 /C/GCE) for quercetin determination was achieved a long linearity ranging from 0.5 to 30 µM, achieving high sensitivity about 1.830 × 10 − 6 A cm − 2 µM − 1 , and the detection limit was calculated to be 0.022 µM (S/N = 3). Besides, the fabricated Co 3 O 4 /C/GCE displayed excellent selectivity, desirable repeatability, and good reproducibility. More importantly, the proposed sensor exhibited satisfactory recovery ranges and accuracy for the determination of trace quercetin in human urine and serum samples, which will make it as an alternative advantageous choice for practical on-site determination. Graphical abstract
The porous Co 3 O 4 /C polyhedron derived by ZIF-67 MOF was successfully synthesized.
The as-synthesized material was employed to prepare chemically modified electrode
for ultrasensitive determination of quercetin. Then the Co 3 O 4 /C-modified glass carbon electrode is displayed good sensitivity and accuracy toward quercetin in urine and
serum samples.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yujie Ma,Mingshi Deng,Xuefeng Wang,Xinghua Gao,Haixiang Song,Yongheng Zhu,Lingyan Feng,Yuan Zhang
A type I nitroreductase-mimicking nanocatalyst based on 2H–MoS 2 /Co 3 O 4 nanohybrids for trace nitroaromatic compounds detection is reported in this work. For the preparation of nanocatalyst, ultrathin Co 3 O 4 nanoflakes array was in-situ grown onto 2H–MoS 2 nanosheets forming three-dimensional (3D) nanohybrid with large specific surface area as well as abundant active sites. The as-prepared nanocatalyst shows a specific affinity as well as high catalytic activity towards nitroaromatic compounds. Given the favorable nitroreductase-mimicking catalytic activity of 2H–MoS 2 /Co 3 O 4 nanohybrid, a sensitive and efficient electrochemical microsensor has been constructed for the detection of 2, 4, 6-trinitrotoluene (TNT). Under optimized conditions, the microsensor displayed sensitive response from μM to pM levels with a limit of detection (LOD) of 1 pM. We further employed photoelectron spectroscopy (XPS) analysis and high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method to identify the nitroreductase-mimicking mechanism of 2H–MoS 2 /Co 3 O 4 nanohybrids towards 2, 4, 6- TNT. It was found that the abundant oxygen vacancies in ultrathin Co 3 O 4 nanoflakes played an essential role in determining its catalytic performance. Moreover, the developed MoS 2 /Co 3 O 4 nanozyme has a lower Michaelis-Menten constant (k m ) than that of nature nitroreductase demonstrating a good enzymatic affinity towards its substrates, and further generating a high catalytic activity. This research not only proposed a new type of nanozyme, but also developed a portable electrochemical microsensor for the detection of 2, 4, 6-TNT.
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Tong Zhu,Jinping Jiang,Jisheng Wang,Zhening Zhang,Jiao Zhang,Jing Chang
A magnetic FeCo 2 O 4 /Co 3 O 4 nanocomposite was successfully synthesized by a facile hydrothermal method as an efficient activator for persulfate (PS) activation to degrade tetracycline (TC) in an aqueous solution. TC removal and mineralization efficiencies reached up to 91.63% and 43.57% in 120 min in the FCC-3/PS system, respectively. The mixed-valence of Fe/Co in the nanocomposite catalyst was beneficial for electrons transfer between Co and Fe elements and enhanced the redox circulation of Fe and Co in between divalent and trivalent. Surficial analysis and phosphate adsorption test confirmed the existence of –OH groups on the surfaces of FeCo 2 O 4 /Co 3 O 4 nanocomposite. Fe/Co redox and surficial hydroxyl in the catalyst played significant roles in the TC potentiation degradation, which was contributed by the plenty of adsorbed –OH groups and excellent dispersity of FeCo 2 O 4 in the FeCo 2 O 4 /Co 3 O 4 composite. The sulfate radicals were major species followed by the hydroxyl radicals , and the surficial adsorbed hydroxyl made great contributions to radical generation. The cycling test and intermediate toxicity analysis indicated that the nanocomposite was considered stable and practicable in water treatment . This work demonstrated that the FeCo 2 O 4 /Co 3 O 4 nanocomposite was an effective and environ-friendly catalyst towards PS activation for removing organic pollutants from water.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Dan Xu,Jianfeng Li,Boyang Li,Huacheng Zhao,Hanghang Zhu,Jinfang Kou,Fengwei Zhang,Zhengping Dong,Jiantai Ma
The sustainable catalytic transformation of alcohols to high value-added fine chemicals is a significant and challenging research topic. Herein, a set of nitrogen-doped carbon encapsulated Co-based catalysts (Co-Co 3 O 4 @NC-T) were prepared by using low-cost dicyandiamide, glyoxal and cobalt nitrate as precursors. The obtained catalysts were utilized for the selective oxidation of alcohols to high value-added esters and carboxylic acids with air as the oxygen source and displayed wide applicability for the oxidation of both aromatic and aliphatic alcohols. Based on the controlled experiments, the protective effect of N-doped carbon structure and the synergistic effect between Co core and Co 3 O 4 species guaranteed the high reaction conversion and selectivity. Benefitting from heterogeneity and magnetism of the catalyst, it can be easily recycled and reused for long-term stability. Reasonable mechanisms of selective oxidation reaction were proposed through EPR analysis and controlled experiments. The present work provides a facile strategy for potential large-scale preparation of heterogeneous catalyst for sustainable and green catalytic transformations.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 30
·75247-75261
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IF 5.8
Sun Qing,Hu Xiaofang,Zhao Yingjie,Zhang Jian,Sheng Jiawei
Dissolved antibiotics have been a research subject due to their widespread presence and potential threats in drinking water treatment. To enhance the photocatalytic activity of Bi 2 MoO 6 for the degradation of norfloxacin (NOR), the heterostructured Co 3 O 4 /Bi 2 MoO 6 (CoBM) composites were synthesized by employing ZIF-67-derived Co 3 O 4 on Bi 2 MoO 6 microspheres. The as-synthesized resultant material 3-CoBM by 300 °C calcination was characterized by XRD, SEM, XPS, transient photocurrent techniques, and EIS. The photocatalytic performance was evaluated by monitoring different concentrations, NOR removal from aqueous solution. Compared with Bi 2 MoO 6 , 3-CoBM exhibited the better adsorption and elimination capacity of NOR due to the combined effect between peroxymonosulfate activation and photocatalytic reaction. The influences of catalyst dosage, PMS dosage, various interfering ions (Cl − , NO 3 − , HCO 3 − , and SO 4 2− ), pH value, and type of antibiotics for application removal were also invested. By activating PMS under visible-light irradiation, 84.95% of metronidazole (MNZ) can be degraded within 40 min, and NOR and tetracycline (TC) can be completely degraded using 3-CoBM. Degradation mechanism was elucidated by quenching tests in combination with EPR measurement, and the degree of activity of the active groups from strong to weak is h + , SO 4 - •, and •OH, respectively. The degradation products and conceivable degradation pathways of NOR were speculated by LC-MS. In combination of excellent peroxymonosulfate activation and highly enhanced photocatalytic performance, this newly Co 3 O 4 /Bi 2 MoO 6 catalyst might be a promising candidate for degrading emerging antibiotic contamination in wastewater.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
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IF 8.4
Mei Chen,Xu Li,Yinxiang Li,Yanhu Li,Ziyu Qin,Qingji Wang
ZnO nanoflower was directly fabricated on ceramic and then Co 3 O 4 was grown in-situ on ZnO nanoflower by a MOF-derived method. Co 3 O 4 nanoparticles were successfully coated on the surface of ZnO nanoflower to develop a sensor for the detection of carbon monoxide . Notably, the Co 3 O 4 /ZnO sensor exhibits an outstanding response of 38 % to 100 ppm CO at 210 ℃ with a fast response/recovery time (38 s/50 s). In addition, the sensor showed excellent selectivity for CO, which is 14 times better than for the second gas (500 ppm CO and NH 3 ). In the meantime, the sensor's response remained a stable value when the 100 ppm CO is mixed with 100 ppm H 2 , CH 4 and HN 3 , respectively. The prominent CO sensing performance of the sensor is attributed to its unique structure charaterastics of nanoflower and the constructed heterostructure , which provides a large surface area and abundant active sites. Therefore, the sensor based on MOF-derived Co 3 O 4 nanoparticles directly on ZnO nanoflower have promising application for constructing high performance CO sensor in the detection domain.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Jing Lei,Ling Zhang,Mei Li,Wei Liu,Yan Jin,Baoxin Li
Oxygen vacancy is one intrinsic defect in metal oxide materials. Interestingly, we herein found that the surface oxygen vacancy can significantly enhance the catalytic activity of Co3O4 nanowires in the luminol–H2O2 chemiluminescence (CL) reaction. 0.1 ng/mL Co3O4 nanowires containing 51.3% surface oxygen vacancies possessed ca. 2.5-fold catalytic activity of free Co2+ (the best metal ionic catalyst for the luminol–H2O2 CL reaction). The superior catalytic efficiency is attributed to the enhanced adsorption of H2O2 by surface oxygen vacancies, which in turn accelerates the cleavage of O–O bonds and generates •OH radicals. More importantly, the surface oxygen vacancy-rich Co3O4 nanowires retained about 90% catalytic activity after modification with antibodies. The surface oxygen vacancy-rich Co3O4 nanowires were used to label the secondary antibody, and one sandwich-type CL immunoassay of carcinoembryonic antigen was established. The detection limit was 0.3 ng/mL with a linear range of 1–10 ng/mL. This proof-of-concept work proves that surface oxygen vacancy-rich Co3O4 nanowires are suitable for labeling biomolecules in CL bioanalysis and biosensing.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Jiajia Liu,Runna Shi,Xiaoshi Lang,Tan Wang,Tingting Qu,Lan Li,Chuangang Yao,Qinzhi Lai,Kedi Cai
Lithium-oxygen battery (LOB) has attracted wide attention owing to its high specific energy and environmental protection advantages. However, LOB also has many problems, such as the discharge products accumulated around the pore size to block the oxygen diffusion channel. In this work, a Co 3 O 4 @Fe 2 O 3 nanosheet composite catalytic material is designed, which can effectively improve the electron transfer in the catalytic process. Furthermore, due to the electronic interaction between Co 3 O 4 and Fe 2 O 3 in the heterostructure region, the optimal active sites for the adsorption and activation of the reactant molecules can be obtained so as to produce better ORR/OER bifunctional catalytic activity. Besides that, the interface between Co 3 O 4 and Fe 2 O 3 can stimulate more electrons to participate in the redox reaction and promote the reversible formation and decomposition of Li 2 O 2 . When Co 3 O 4 @Fe 2 O 3 nanosheet composite as cathode catalyst, LOB can achieve a high discharge specific capacity of 5585 mAh/g with 141 stable charge and discharge cycles.
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Molecular Catalysis
·
2023
·
IF 4.6
Jiahao Chen,Yiqing Zeng,Shule Zhang,Zhaoxiang Zhong,Qin Zhong
Interface interaction existed in the multicomponent determines the catalytic performance of composite catalysts. Herein, a Co 3 O 4 -LaCoO 3 (Co-La) composite catalyst with strong spinel-perovskite interface interaction was successfully synthesized via a one-pot sol-gel method for the catalytic oxidation of toluene. The activity test results showed that the optimal 1Co 3 O 4 –4LaCoO 3 (1Co-4La) catalyst exhibits much higher catalytic activity (T 90 = 215 °C, GHSV = 50,000 h −1 ) than Co 3 O 4 (T 90 = 295 °C), LaCoO 3 (T 90 = 256 °C) and 1Co 3 O 4 /4LaCoO 3 (1Co/4La) (prepared by mechanical ball-milling, T 90 = 285 °C). Characterizations revealed that the strong spinel-perovskite interface interaction generated between the Co 3 O 4 spinel and LaCoO 3 perovskite in 1Co-4La facilitates the transfer of interfacial electrons, contributing to the exposure of surface active Co 3+ and the enhanced oxidation ability of surface active Co 3+ on 1Co-4La. In addition, the reactive lattice oxygen of surface Co 3+ –O on 1Co-4La effectively promotes the decomposition of toluene into CO 2 , enabling the low-temperature oxidation of toluene through the Mars-van Krevelen (MvK) mechanism. This work provides insight into the promotional effect of multicomponent interface interaction on enhancing catalytic performance of spinel-perovskite composite catalysts.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 12
·3437-3450
·
IF 3.186
Bao Er-Peng,Dong Ruichen,Zhang Shuoqing,Li Huan,Zhang Weiguo,Zou Jijun,Xu Qiang
The photocatalysis is a very promising technique to address the serious issues of environmental pollution. Among the common photocatalysts, the graphitic carbon nitride (g-C 3 N 4 ) is widely used for the photodegradation of organic pollutants due to its proper band structure. To further improve the photocatalytic performance of g-C 3 N 4 , a novel composite photocatalyst of Co 3 O 4 /PT-C 3 N 4 has been prepared by using a one-pot calcination method, in which cobalt tetroxide (Co 3 O 4 ) nanoparticles as the cocatalyst are introduced on the surface of rectangular hollow g-C 3 N 4 substrate (PT-Co 3 O 4 ). As a result, the obtained composite photocatalyst (Co3O 4 /PT-C 3 N 4 ) delivers an excellent photodegradation performance for diesel oil under a simulated sunlight, which can improve the separation efficiency of the photo-induced electron–hole pairs. The Co 3 O 4 /PT-C 3 N 4 composite photocatalyst exhibits a high degradation efficiency of 96.27% after 2 h of visible light, which is much higher than that of the PT-C 3 N 4 photocatalyst. Moreover, the composite photocatalyst can still maintain a high photodegradation efficiency after 10 cycles, exhibiting an excellent cyclic stability. The photo-induced carriers generated by the Co 3 O 4 /PT-C 3 N 4 composite photocatalyst follow the Z-scheme heterojunction transfer mechanism. This work gives a fresh idea for the exploration of new high-performance photocatalyst for the treatment of organic environmental pollutants. Graphical Abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Meimei Wang,Yunke Cui,Hongyang Cao,Ping Wei,Chen Chen,Xiuyan Li,Juan Xu,Guoping Sheng
In this study, zeolitic imidazolate framework-67 (ZIF-67) derived Co 3 O 4 /NiCo 2 O 4 double-shelled nanocages (DSNCs) were fabricated and utilized as catalysts to activate peroxydisulfate (PDS) for bisphenol A (BPA) degradation. The results showed that Co 3 O 4 /NiCo 2 O 4 DSNCs exhibited superior BPA degradation performance over Co 3 O 4 NCs and NiCo 2 O 4 NCs. PDS combined with the interfaces of both the Co 3 O 4 inner shell and NiCo 2 O 4 outer shell to form complex, inducing the nonradical oxidation of BPA by electron abstraction. The double-shelled hollow structure helped to increase the instantaneous concentration of reactants in the void space of Co 3 O 4 /NiCo 2 O 4 DSNCs, thus promoting the decomposition of BPA. The Co 3 O 4 /NiCo 2 O 4 DSNCs had high selectivity for BPA degradation and were resistant to halogens and background organic matter in wastewater. Our work indicated that metal-organic framework (MOF)-derived nanomaterials with a hollow structure have a promising application prospect for persulfate-based advanced oxidation technology.
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