JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiyu Wang,Ying Lu,Gunel Imanova,Sridhar Komarneni,Jianfeng Ma
Antibiotics have garnered global attention as a pressing concern due to their wide spread discharge to the environment and resulting significant threats to both human health and the environment. The Sulfate Radical-based Advanced Oxidation Processes (SR-AOPs) technique has already been verified as an effective process for pollutant degradation. Herein, FeS 2 @Co 3 O 4 -C composites, utilizing ZIF-67-derived Co 3 O 4 -C as the substrate material, were fabricated using a single-step solvothermal technique for the degradation of tetracycline (TC) by activated peroxymonosulfate (PMS) in combination with visible light irradiation. In the FeS 2 @Co 3 O 4 -C/PMS/Vis system, the FeS 2 @Co 3 O 4 -C showed better activation performance than the single chemical activation system or photocatalytic system, with 97.2 % TC removed in 20 min. The FeS 2 @Co 3 O 4 -C composite material was thoroughly investigated employing X-ray diffraction (XRD) for analyzing its crystal structure, transmission electron microscopy (TEM) for detailed structural insights, scanning electron microscopy (SEM) for morphological examination, and X-ray photoelectron spectroscopy (XPS) for the elemental valence states. The quenching experiments, along with EPR test, revealed that the primary active oxygen species consisted of 1 O 2 , O 2 ·- , and h + . The results presented here suggest the impressive stability and recyclability of FeS 2 @Co 3 O 4 -C making it a potential candidate as an efficient catalyst for initiating the activation of PMS in degrading persistent organic pollutants present in water.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xue Qi,Hongmin Gao,Lei Wu,Yang Zhou,Hehua Zhang,Dong Chang,Hongzhi Pan
Accurate and sensitive detection of the neurotransmitter dopamine (DA) plays a significant role in medical diagnosis and human health assessment. Herein, an electrochemical sensing platform for ultrasensitive determination of DA was constructed based on porous Co 3 O 4 nanocubes anchored to three-dimensional Ti 3 C 2 MXene-reduced graphene oxide aerogel (Co 3 O 4 /3D MX-rGO). The 3D MX-rGO aerogel with a high specific surface prevents aggregation of Co 3 O 4 nanocubes and exposes more active sites, resulting in excellent electrocatalytic activity and outstanding sensing properties. The electrochemical reaction kinetic was investigated in detail, a possible sensing mechanism was proposed, and the interaction mechanism between the composites and DA was revealed combined with density functional theory (DFT) calculations. Under optimized experimental conditions, the sensor developed using Co 3 O 4 /3D MX-rGO modified glassy carbon electrodes (GCE) exhibited low detection limits (40 nM) in the range of 0.1–300 μM for DA with good selectivity, reproducibility, and stability. The sensor has been successfully use to detect DA in human serum and urine samples with recoveries of 95.3 %-103.7 %, which has great potential for practical applications.
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Molecular Catalysis
·
2025
·
IF 4.9
Xinping Wu,Mengting Liu,Hongyao Zhao,Danhong Shang,Yanyun Wang,Feng Zeng,Jialing Shen,Jianming Pan,Xiang Liu,Yiyan Song,Fu Yang
Widespread industrial application of bisphenol A (BPA) has produced large amounts of contaminated wastewater, and its accumulation in the environment has threatened human health. In this study, MnOOH nanorods were deposited with the polydopamine layer containing incorporated Co precursor, which was derived to obtain carbon shell confined Co 3 O 4 onto Mn 2 O 3 nanorods. The controlled calcination temperature was optimized to improve the active state of metal species. Carbon shells mediate the electronic interactions between Co 3 O 4 and Mn 2 O 3 , triggering more Co(II/III) redox cycles and an enhanced fraction of Mn(III) along with more oxygen vacancies in Mn 2 O 3 . In addition, more pyridinic N species were generated in the carbon shell of Mn@C/Co-600, affording better affinity to the polar contaminants and peroxymonosulfate (PMS). Therefore, these characters in Mn@C/Co-600 caused the accelerated reaction cycles in the PMS activation and BPA degradation. Compared with other catalysts, Mn@C/Co-600 showed the highest degradation efficiency of bisphenol A (BPA) with the rate constant of 0.827 min −1 , which was up to 30 times higher than that of Mn@C/Co-Cl-600 (0.027 min −1 ). The anions interference effect on BPA degradation follows the order of Cl − (0.925 min −1 )
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lei Li,Jiaming Zhang,Yang Song,Ronghui Dan,Xiaojuan Xia,Jiang Zhao,Rongqing Xu
To meet evolving humidity monitoring needs, the development of flexible, high-performance humidity sensors is crucial. This study introduces an innovative flexible humidity sensor using a single-step laser scribing technique to fabricate a flexible in situ Co3O4 nanoparticle-embedded laser-induced graphene (Co3O4–LIG) composite electrode. Compared to conventional LIG electrodes, the Co3O4–LIG electrode exhibits improved conductivity and hydrophilicity, enhancing charge transfer and water molecule affinity. The unique two-dimensional structure and exceptional water permeability of graphene oxide (GO) combine with the rapid water response and high specific surface area of carboxylated multiwalled carbon nanotubes (MWCNTs), thereby assuming a crucial function in the modification and optimization of the performance of humidity sensors. Through the application of a homogenously blended aqueous solution comprising GO and MWCNTs in precise proportions onto the Co3O4–LIG composite electrode, an excellent humidity-responsive layer is established, culminating in the realization of a cutting-edge GO–MWCNTs@Co3O4–LIG flexible humidity sensor. Noteworthy attributes of this sensor include a heightened sensitivity [959.1% (ΔR/R0)], rapid response and recovery times (within 5 and 26 s, respectively), and a noteworthy linearity (R2 = 0.994) across a relative humidity range of 14 to 95%. The findings presented herein offer valuable insights and a practical blueprint for the design and production of flexible humidity sensors.
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Environmental Science-Nano
·
2024
·
IF 5.8
Daqing Chen,Minghui Li,Wanzhu Wang,Danhua Ge,Xiaojun Chen
Developing high-performance nanozymes at neutral pH is extremely necessary for the application of biological and water environmental systems. RuCl3 modified hollow Co3O4 nanospheres (Ru3+-Co3O4 HNSs) were utilized to establish a colorimetric sensor for selective determination of sulfide ions (S2-). The hollow Co3O4 nanospheres after doping of Ru3+ provide large surface area and more active sites, thereby boosting the electron transport and the affinity to the substrates. Specifically, the as-prepared Ru3+-Co3O4 HNSs exhibited remarkable peroxidase-like (POD-like) activity, which can catalyze colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB at neutral pH condition. Furthermore, the Ru3+-Co3O4-based colorimetric sensor achieved a wide linear range (0.5-20 μM) and a low detection limit (0.051 μM) for S2- ions concentration, as well as good selectivity, reproducibility and practicability in sewage water. This research aims to boost the accuracy of S2- detection and shed light on application prospects in the water environmental fields.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Suiqi Zhu,Changchun Ye,Yifei Li,Yanan Chong,Tingyu Chen,Jin Yang,Mingli Fu,Keyou Yan,Yongcai Qiu
The construction of hybrid nanocatalysts with enhanced active surfaces/interfaces is crucial for the catalytic oxidative removal of volatile organic compounds (VOCs). In this study, we report an in-situ conversion approach to synthesize a heterostructured Co 3 O 4 /Co catalyst (Co@NC-0.5) for efficient photothermal catalytic oxidation of acetone. The catalysts were prepared by pyrolyzing a mixture of ZIF-67 and melamine. The exposed cobalt species underwent in-situ oxidation to form a Co 3 O 4 /Co heterostructure under photothermal conditions. This unique catalyst structure exhibited over 90 % conversion within 16 min under full solar spectrum irradiation and excellent reusability with continuous maintenance of 100 % acetone conversion rate after nine cycles performance tests. Notably, its specific mass activity under thermocatalytic conditions was 2.13 times higher than that of Co 3 O 4 . Our work provides a facile and effective strategy for developing highly active and durable non-precious metal catalysts suitable for various photothermal catalytic reactions.
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CARBON
·
2024
·
IF 10.5
Sikui Chen,Ce Cui,Jiatong Yan,Chuanxi Lin,Shan Jiang,Hong Tang,Ronghui Guo
The increasing proliferation of modern communications, radar systems, and military equipment operating in the X and Ku bands (8–18 GHz) has exacerbated the issue of electromagnetic wave (EMW) pollution, highlighting the urgent need for lightweight, broadband EMW-absorbing materials. In this paper, the lightweight carbon fiber aerogel@hollow carbon/Co 3 O 4 microsphere (CFA@H–C/Co 3 O 4 ) were composed by ZIF-67 derived hollow carbon/Co 3 O 4 microsphere and bamboo cellulose fiber derived carbon fiber aerogels and constructed by in-situ chemical deposition, dopamine treatment and pyrolysis. Carbon fiber aerogels form a lightweight three-dimensional (3D) interconnected conductive network, which expands the multiple reflection and absorption paths of EMW and increases the dielectric loss. The hollow carbon/Co 3 O 4 microsphere inhibits the collapse of the structure by forming a polydopamine shell through the self-polymerization effect of dopamine on the surface of ZIF-67 during pyrolysis, showing dipole polarization loss, interface polarization loss and magnetic loss, which plays an important role in improving EMW polarization loss and optimizing impedance matching. The minimum reflection loss (RL min ) of CFA@H–C/Co 3 O 4 reaches −43.5 dB at frequency of 12.88 GHz with thickness of 3.0 mm and the effective absorption bandwidth (EAB) of CFA@H–C/Co 3 O 4 reaches 7.84 GHz (10.08–17.92 GHz) with thickness of 3.0 mm, covering most of X and Ku bands at a low filling ratio of 15 wt%. The radar cross-section (RCS) value of CFA@H–C/Co 3 O 4 is 22.68 dB m 2 lower than the perfect electrical conductor (PEC). This study provides valuable insights into materials that can improve the absorption bandwidth of electromagnetic waves in the X and KU bands.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jinyun Liao,Yuanzhong Li,Jingjing Tian,Yufa Feng,Quanbing Liu,Hao Li
Catalytic methanolysis of ammonia borane is an integrated hydrogen production/storage technology with bright prospects, while its wide application is impeded by the high-cost of catalysts. In this work, hollow core@shell structured (HCSS) Co 3 O 4 @CuO-NiO with a size of 300–500 nm and a shell thickness of ca. 100 nm has been designed for ammonia borane (NH 3 BH 3 ) methanolysis for rapid hydrogen release. The possible formation mechanism of HCSS-Co 3 O 4 @CuO-NiO is proposed based on a series of characterization results, which is crucial for the design and preparation of nanocatalysts with similar architectures. Benefiting from the optimized compositions and electronic structures, the best HCSS-Co 3 O 4 @CuO-NiO sample exhibits high catalytic activity in NH 3 BH 3 methanolysis with a turnover frequency of 67.1 min −1 , surpassing that of all the noble-metal-free catalysts in previous reports. A possible reaction mechanism of NH 3 BH 3 methanolysis is put forward based on the in-situ Fourier transform infrared spectrometer (FTIR) characterization and kinetic isotope effect (KIE) experimental results. This work supplies a novel avenue for developing cheap and robust catalysts towards NH 3 BH 3 methanolysis by tailoring the catalysts’ morphology to hollow core@shell structures.
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RSC Advances
·
2017
·Vol. 7
·期 86
·54460-54467
·
IF 3.108
Xiaoyun Lin,Yanfang Wang,Wenhui He,Yongnian Ni,Serge Kokot
Nanostructured Co3O4 with near-cubic morphology was synthesised using the solvothermal method, and a non-enzymatic electrochemical glucose sensor (Co3O4–CuNPs/Pt) was successfully constructed by dropping and potentiostatic depositing technologies. The obtained Co3O4 and Co3O4–CuNPs were characterised and investigated by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Quantitative analysis of glucose was performed using the amperometric (i–t) method, and a plot of current difference versus concentration of glucose was linear in the range 0.5–336 μM, with a linear correlation coefficient (R2) of 0.9989 and limit of detection (LOD) of 0.43 μM. When the linear range was reduced to 0.5–76.5 μM, R2 and LOD were 0.9997 and 0.17 μM, respectively. The sensitivity of the sensor was evaluated as 3.58 × 104 and 4.03 × 104 μA μM−1 cm−2 for the above two linear ranges, respectively. This novel sensor produced satisfactory reproducibility and stability and was applied to monitor trace amounts of glucose in human serum samples.
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Nanoscale Research Letters
·
2017
·Vol. 12
·期 1
·1-10
·
IF 2.833
Xu Zhiqiang,Liu Wei,Yang Yuanyi,Sun Lijuan,Deng Yi,Liao Li
In this work, we developed an eco-friendly strategy for preparing Co 3 O 4 nanowires. The process consisted of two steps: controllable synthesis of metal cobalt nanowires followed by a facile air-oxidization step. The 1D nanowire structure with a high aspect ratio was easily achieved via a magnetic-field-assisted self-assembly of cobalt ion complexes during reduction. After air-calcinations, the Co 3 O 4 nanowires were prepared in large scale and ready to be used as the anode material for lithium-ion batteries. The Co 3 O 4 nanowires, which possessed a length ranging from 3 to 8 μm with the aspect ratio more than 15, exhibited a reversible lithium storage capacity up to ~ 790 mAh/g when using a small amount of defect-free graphene flakes as conductive additives. The superior electrochemical performances were ascribable to the synergistic “flat-on” effect between the 1D nanowires and the 2D graphene. Therefore, the Co 3 O 4 nanowire/graphene composite holds promising application for lithium-ion batteries.
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SOLID STATE SCIENCES
·
2024
·
IF 3.4
Ke Yang,Sisi Cheng,Ziqin Yao,Shijia Li,Yuting Yang
Researchers in the field of electrochemistry have recently become interested in the extraordinary features of ternary transition metal oxide nanostructures with spinel structure derived from metal-organic framework (MOFs). In this study, the zeolitic imidazolate framework (ZIF-67), which grows in situ on the surface of another metal organic framework (Ce-BTC), was created using the internal expansion growth method (IEGM), and the resulting complex was then used as a template to create the dumbbell-like nanocomposite. Due to the strong electron conduction of CeO 2 in composites, the electrode modified with composite material has good electrochemical activity in alkaline solution. As a glucose sensor, Co 3 O 4 /CeO 2 nanocomposite modified glass carbon electrode (Co 3 O 4 /CeO 2 /GCE) has better performance with a detection range of 83.75 μM–2796.84 μM, a reasonably good sensitivity of 790.746 μA mM −1 ·cm −2 , an estimated detection limit of 5.5 μA (S/N = 3) and a short response time less than 3s. The modified electrode can continue to function normally even when exposed to various interfering compounds for extended periods of time in the air. The successful use of this enzyme-free glucose sensor in fruit juice demonstrates its remarkable performance and provides ideas for future applications.
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CHEMOSPHERE
·
2024
·
IF 8.1
Ning Wang,Wei Wang,Dan Qi,Guodong Kang,Bo Wang,Houhu Zhang,Jiuli Ruan,Rongrong Lei,Zhenhua Zhang,Shenghu Zhang,Hao Zhou
The production of cheap, efficient, and stable photocatalysts for degrading antibiotic contaminants remains challenging. Herein, Bi 2 O 3 /boron nitride (BN)/Co 3 O 4 ternary composites were synthesized using the impregnation method. The morphological characteristics, structural features, and photochemical properties of the prepared photocatalysts were investigated via X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, and ultraviolet–visible (Vis) diffuse reflectance spectrum techniques. BN was used as a charge transfer bridge in the ternary composites, which afforded a heterojunction between the two semiconductors. The formation of the heterojunction substantially enhanced the charge separation and improved the photocatalyst performance. The degradation activity of the Bi 2 O 3 /BN/Co 3 O 4 ternary composites against norfloxacin (NOR) under Vis light irradiation was investigated. The degradation rate of NOR using 5-wt% Bi 2 O 3 /BN/Co 3 O 4 reached 98% in 180 min, indicating excellent photocatalytic performance. The ternary composites also exhibited high photostability with a degradation efficiency of 88.4% after five cycles. Hydroxyl radicals (•OH), superoxide radicals (•O 2 − ), and holes (h + ) played a synergistic role in the photocatalytic reaction, where h + and •O 2 − were more important than •OH. Consequently, seven intermediates and major photocatalytic degradation pathways were identified. Toxicity experiments showed that the toxicity of the degradation solution to Chlorella pyrenoidosa decreased. Finally, the ecotoxicity of NOR and its intermediates were analyzed using the Toxicity Estimation Software Tool, with most intermediates exhibiting low toxicity.
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