SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yanqing Cong,Yudi Wang,Jiajia Luo,Liwen Fan,Xinyun Li,Chenyi Wang,Xinyi Shen,Zihan Xu,Shi-Wen Lv
The pollution problem caused by fluorinated pharmaceutical is a big challenge facing humanity, and it is of great significance to develop an effective remediation method. Herein, Co 3 O 4 /g-C 3 N 4 composites with photocatalytic activity are synthesized and employed to activate Peroxymonosulfate (PMS) for the degradation of fluorinated pharmaceutical, and we bring about an interesting discovery that light irradiation can change the activation pathway of PMS. Due to the formation of internal electric field, Co 3 O 4 /g-C 3 N 4 composite exhibits very good charge transfer ability and offers more active sites. Thus, Co 3 O 4 /g-C 3 N 4 composite can quickly activate PMS to produce SO 4 •- , achieving effective degradation of ofloxacin with a reaction rate constant as high as 1.6813 min −1 . Once visible light irradiation is introduced, notably, the activation pathway of PMS over Co 3 O 4 /g-C 3 N 4 composite becomes non-radical mechanism based on 1 O 2 , which is mainly ascribed to the generation of O 2 •- . More significantly, anti-interference ability of Co 3 O 4 /g-C 3 N 4 -mediated PMS system is visibly enhanced under the visible light irradiation. To our surprise, consumed electrons of Co 3 O 4 /g-C 3 N 4 composite can be restocked by photogenerated carriers, thereby resulting in the regeneration of catalytic activity. During a long-term operation, Co 3 O 4 /g-C 3 N 4 -mediated PMS system always displays good performance in ofloxacin degradation. In short, current work shared some new insights into the research on the removal of fluorinated pharmaceutical.
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RSC Advances
·
2025
·Vol. 15
·期 22
·17665-17674
·
IF 4.6
Hao Ji,Zelin Li,Zhenyi Xu,Lingmin Yao,Rui Tong,Shan Zhang
Developing an efficient visible-light-responsive catalyst for the hydrogen evolution reaction (HER) is essential for addressing energy scarcity and environmental pollution. In this study, one-dimensional Co3O4 (CO) nanoparticles were synthesized via electrospinning and subsequently sulfurized using a low-temperature solvothermal method. These sulfurized one-dimensional CO nanoparticles were then combined with two-dimensional sheet-like ZnIn2S4 (ZIS) to form a p–n heterojunction composite semiconductor photocatalyst (SCO/ZIS). The one-dimensional CO nanoparticles obtained through electrospinning significantly enhance the catalytic activity and efficiency, while sulfurization further improves their electronic structure and surface properties. The built-in electric field at the p–n heterojunction interface between n-type ZIS and p-type SCO effectively inhibits the recombination of photogenerated electron–hole pairs while facilitating electron transfer. Additionally, the incorporation of one-dimensional SCO into sheet-like ZIS prevents ZIS stacking, improving sunlight utilization and substantially enhancing photocatalytic HER performance. Our results demonstrate that SCO/ZIS achieves a superior HER rate of 4300.3 μmol g−1 h−1 under visible light, which is 7.45 times higher than that of pristine ZIS, while also exhibiting excellent photocatalytic stability.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jiafeng Wu,Yang Chen,Jianmin Chen,Yajing Wang,Ting Fan,Yingwei Li
Inferior specific capacity and sluggish redox kinetics are the most stubborn problems lithium-ion and lithium-sulfur batteries (LIBs and LSBs) are facing, respectively. Here we report a facile fabrication of self-supported hollow Co 3 O 4 @carbon nanotubes on carbon cloth (H-Co 3 O 4 @CNT/CC) through a mild pyrolysis-oxidation process. The additive- and binder-free H-Co 3 O 4 @CNT/CC shows excellent electrochemical performances as both LIBs and LSBs electrodes. As a robust integrated anode for LIBs , the areal capacities are 2.72 mAh cm −2 at the current density of 0.5 C over 1000 cycles. While as a durable cathode host for LSBs, favorable areal capacities of 2.37 mAh cm −2 are maintained with a low capacity decay of 0.11 % per cycle at the sulfur loading of 6 mg cm −2 and current density of 1 C after 400 cycles. Electrochemical technology, ex situ Raman spectroscopy and DFT calculations are performed to comprehensively analyze H-Co 3 O 4 @CNT/CC via thermodynamics and kinetics. It is demonstrated that the hierarchically hollow interior structure, strong adsorb ability of Co 3 O 4 toward polysulfides and three-dimensional (3D) inter-connected conductive carbon framework are responsible for the high areal capacity, fast redox kinetics and cycling durability.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 6
·6148-6156
·
IF 2.195
Xiao Mingjun,Meng Yanshuang,Duan Chaoyu,Zhu Fuliang,Zhang Yue
Co 3 O 4 /Nitrogen doped carbon (Co 3 O 4 /NDC) composite is successfully prepared using 1-butyl-3-methylimidazolium dicyanamide ([BMIm]N(CN) 2 ) as carbon and nitrogen sources. The properties of Co 3 O 4 /NDC composite and bare Co 3 O 4 are systematically characterized by X-ray diffraction, Raman spectrum, transmission electron microscopy (TEM), and scanning electron microscopy. TEM result indicates that the Co 3 O 4 particles are coated with a layer of nitrogen doped carbon film, with can enhance its conductivity and alleviate the volume effect. The results of electrochemical tests show that the discharge specific capacity of Co 3 O 4 /NDC composite is 1088 mAh g −1 of 0.1 C (1 C = 890 mA g −1 ) after 100 cycles. Compared to Co 3 O 4 /NDC composite, the discharge specific capacity of bare Co 3 O 4 is 628 mAh g −1 of 0.1 C after 100 cycles. The enhanced electeochemical properties can be attributed to the nitrogen doped carbon film that prevents the structure from being destroyed during lithium ion (Li + ) insertion/deinsertion process and improves the conductivity.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Shan Yan,Lina Xu,Jun Jiang,Hongping Xiao,Xinhua Li
Single-material electrodes do not satisfy the demands of high-performance supercapacitors. To exploit the advantages of both oxides and carbon-based materials, a tightly packed Co 3 O 4 /NiCo 2 O 4 /NiO/C&S nanocomposite is fabricated by sintering a Co/Ni-based coordination complex precursor at 400 °C. The composites and basic components are characterized using various techniques, namely, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy , Brunauer–Emmett–Teller specific surface area analysis, and elemental analysis . The electrochemical performance is analyzed by cyclic voltammetry , galvanostatic charge/discharge cycling, and electrochemical impedance spectrometry . A uniform nanocomposite was found to be formed of NiCo 2 O 4 , NiO, and Co 3 O 4 nanoparticles , incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>20,000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The roles of C and S in forming a stable structure are investigated. The results show that a supercapacitor with electrodes made from the as-prepared Co 3 O 4 /NiCo 2 O 4 /NiO/C&S composite will be promising for commercial applications.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shuang Wei,Sheng Zhong,Chao Bao,Linbo Huang,Kexin Li,Ruirui Wang,Bin He,Ruirui Zhang,Ruixia Liu
The selective electrocatalytic oxidation of glycerol to high-value C2–C3 chemicals offers a promising approach to glycerol overproduction, while it struggles with precise C–C cleavage and limited selectivity from multiple pathways. Regulating the adsorption capacity of glycerol oxidation intermediates and the degree of C–C bond cleavage through the interfacial electronic structure of electrocatalysts is crucial for controlling C2–C3 selectivity. Herein, a self-supported p-n heterojunction catalyst (Co3O4/CeO2) is developed for the efficient electrocatalytic oxidation of glycerol to C2 chemicals, achieving a glycolic acid selectivity of 42%, with a yield of 19.6 μmol cm–2 h–1. The built-in electric field enables rapid interfacial charge transfer from CeO2 to Co3O4, which leads to the upshifted d-band center of active Co3O4. Electrochemical characterization and theoretical calculations demonstrate that the heterojunction promotes the adsorption of hydroxyl species and glycerol, thereby enhancing the activity of the glycerol oxidation reaction (GOR). Concurrently, the optimized electron cloud distribution of Co3O4 active sites strengthens the adsorption of oxygen-containing intermediates while weakening the adsorption of glycolic acid and suppresses the further cleavage of C–C bonds, thus increasing glycolic acid selectivity. This study clarifies the redox kinetic adsorption regulation mechanism of the Co3O4/CeO2 heterojunction catalyst and provides a highly promising electrocatalyst design strategy for the production of high-value-added C2 products via glycerol oxidation.
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高影响因子
Journal of Physical Chemistry C
·
2013
·
IF 4.814
X. Ge,C. D. Gu,X. L. Wang,J. P. Tu
An ionothermal strategy is developed to synthesize hydrotalcite-like α-Co(OH)2 sheets. The structure and interlayer chemistry of α-Co(OH)2 are facilely manipulated, thus determining its pseudocapacitive performance. Significantly, a very large space of 11.2 Å in (003) plane induced by various intercalated species is found in the ionothermal synthesized α-Co(OH)2 obtained at 210 °C (210-α-Co(OH)2), which delivers a better pseudocapacitive performance. Annealing the synthesized α-Co(OH)2 generates mesoporous Co3O4 sheets or nanoparticles, which depends on the structure of the precursors. More defects in the α-Co(OH)2 precursor provide larger driving force during the nucleation of Co3O4 nanocrystals, thus reducing the grain size. The architecture of the 210-Co3O4 derived from 210-α-Co(OH)2 is featured as self-supporting mesoporous nanosheets composed of ∼5 nm sized grains. The fine grains and ultralarge specific surface area of ∼113.5 m2 g–1 in the 210-Co3O4 can trigger the formation of CoO intermediate during lithium ion insertion into the Co3O4. The 210-Co3O4 exhibits superior cycling performance as electrode for lithium ion battery and supercapacitor over the other Co3O4 samples due to its nanocrystallite constructed mesoporous sheet structure, which has a higher strain accommodation capability. The underlying mechanism discussed in this work provides guidance on structural design of advanced energy storage materials.
研究领域:
材料科学
·
电化学
·
储能
·
纳米材料
·
无机合成
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Shan-Shan Liu,Huifen Fu,Shujian Li,Hongli Liu,Yichen Guo,Chen Zhao,Zhihua Wang
To precisely engineer the polymerization-deposition (PD) route of Fenton-like reactions for efficient phenols decontamination, this study developed a CeO 2 /Co 3 O 4 composite featuring abundant interfacial asymmetric oxygen vacancies (As-OVs), addressing ambiguous structure-activity relationship and unclear catalytic mechanism in PD route regulation. The catalytic behavior, peroxymonosulfate (PMS) activation pathway, phenols transformation mechanism and continuous operation performance were systematically investigated via experiments, characterization and theoretical calculation. Compared with symmetric oxygen vacancies (S-OVs) in Co 3 O 4 alone, As-OVs altered phenols oxidation from mineralization to PD route by anchoring PMS via terminal oxygen atoms rather than peroxide bond, avoiding O-O bond cleavage along with radical pathway, thus suppressing oxidant waste and enabling 100 % ETP-triggered PD route. At ultra-low PMS/BPA ratio (1.14), 79.7 % TOC removal was achieved, reducing PMS consumption to 4 % vs. mineralization pathway and enabling long-term continuous practical wastewater treatment. Experimental and theoretical calculation revealed that the unique PMS adsorption configuration, greater electron rearrangement tendency and enhanced phenoxyl radical adhesion around As-OVs facilitate efficient coupling to form crosslinked products on the catalyst, ensuring excellent structural and catalytic stability of OVs-CeO 2 /Co 3 O 4 . These findings deepen understanding of metal oxide-guided PD route via interfacial defect engineering, contributing to cost-efficiency and advancing high-performance, sustainable wastewater decontamination technologies with long-term operation.
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HYDROMETALLURGY
·
2022
·
IF 4.217
Jiadong Liu,Tsz Yau Mak,Zhe Meng,Xuyang Wang,Yulin Cao,Zhouguang Lu,Dawson Wai-Shun Suen,Xiao-Ying Lu,Yuanyuan Tang
Rechargeable lithium-ion batteries (LIBs) have been widely used in consumer electronics and electric vehicles . In terms of environmental restrictions and circular economy , proper treatment of spent LIBs is of great significance for achieving sustainable development. In this study, organic p -toluene sulfonic acid (PTSA) was employed to recycle valuable Li and Co elements from the spent LIBs for production of battery raw materials (e.g. Li 2 CO 3 and Co 3 O 4 ). Operation parameters such as PTSA concentration, hydrogen peroxide (H 2 O 2 ) concentration, solid-to-liquid ratio, leaching temperature and leaching time, were systematically investigated. Under the optimal conditions (0.9 vol% H 2 O 2 , 1.5 mol L −1 PTSA, 30 g L −1 solid-to-liquid ratio, 80 °C, and 60 min), the leaching efficiencies of commercial LiCoO 2 could reach ∼100% and 99% for Li and Co, respectively, while the corresponding values were about 95% and 93% for the spent LiCoO 2 . In addition, the selective precipitation of Co-rich compounds in cooled leachate allowed an effective separation of Co from the mixture. The high recovery yield of Co 3 O 4 and Li 2 CO 3 demonstrated the great potential of the PTSA-assisted leaching strategy in hydrometallurgical recycling of the spent LIBs for practical applications. Overall, this proposed recovery process is simple, efficient, and environmentally friendly and is of vital importance for rational treatment of spent LIBs.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Wei Li,Wei Li,Kuanchang He,Longxiang Tang,Qian Liu,Kui Yang,Yi-Di Chen,Xin Zhao,Kai Wang,Hui Lin,Sihao Lv
Cobalt-based catalysts have been widely explored in the degradation of organic pollutants based on peroxymonosulfate (PMS) activation. Herein, we report an MXene nano-Co 3 O 4 co-catalyst enriched with oxygen vacancies (O v ) and steadily fixed in nickel foam (NF) plates, which is used as an efficient and stable PMS activator for the removal of 1,4-dioxane (1,4-D). Ti originating from MXene was doped into the Co 3 O 4 crystal, generating large amounts of O v , which could provide more active sites to enhance PMS activation and facilitate the transformation of Co 2+ and Co 3+ , causing a high stability. As a result, the 1,4-D removal efficiency of the NF/MXene-Co 3 O 4 /PMS system ( k app : 2.41 min −1 ) was about four times higher than that of the NF/Co 3 O 4 /PMS system ( k app : 0.62 min −1 ). In addition, singlet oxygen was the predominant reactive oxygen species . Notably, the 1,4-D removal of the NF/MXene-Co 3 O 4 /PMS system was over 95% after 20 h operation in the single-pass filtration mode with only 3.72% accumulative Co leaching, showing excellent stability and reusability of NF/MXene-Co 3 O 4 . This work provides a defect engineering strategy to design a robust and stable catalytic system for water treatment , which expands the application of MXene in the field of environmental remediation.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Wenyang Fu,Zhongzheng Hu,Yingying Du,Pei Su,Yi Su,Qizhan Zhang,Minghua Zhou
The electrochemical reduction of nitrate to ammonia (ERNA) has become a green treatment technology for nitrate wastewater. However, strong adsorption for product caused high activation energy for product desorption in scaling relations, blocking activity of electrocatalyst in ERNA. Density functional theory (DFT) calculations indicated that constructing dual active sites (Cu and Co 3 O 4 ) could achieve strong adsorption of nitrate (−2.91 eV) with low desorbing energy barrier of ammonia (0.13 eV), breaking scaling relations. This dual active sites Co 3 O 4 /Cu electrode achieved a high ammonia yield rate of 684 µg mg cat − 1 h −1 with 94.6% faradic efficiency, surpassing single active site Co 3 O 4 and Cu electrodes. For mechanism, In-situ electrochemical characterization found the vital intermediates of *NH and *NH 2 , demonstrating that indirect reduction was the main pathway on Co 3 O 4 /Cu electrode. Thus, it is believed that building dual active sites on electrode is a reliable strategy to enhance ERNA for purifying industrial wastewater polluted by nitrate.
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Chemosensors
·
2022
·Vol. 10
·期 7
·260
·
IF 4.229
Zhaoxia Shi,Ling Xia,Gongke Li,Yufei Hu
High purity methyl tert-butyl ether (MTBE) can be used to adjust gasoline octane values. However, an isomer, methyl sec-butyl ether (MSBE), is the main by-product of its industrial production, and this affects the purity of MTBE. Pt/Au NPs@Co3O4composites with a hollow dodecahedron three-dimensional structure were synthesized using ZIF-67 as a template, with Pt and Au nanoparticles (NPs) evenly distributed on the shell of the hollow structure. A CTL sensor was established for the determination of MSBE based on the specificity of Pt/Au NPs@Co3O4. The experimental results showed that Pt/Au NPs@Co3O4had a strong specific cataluminescence (CTL) response to MSBE, with no interference from MTBE. The linear range was 0.10–90 mg/L, the limit of detection was 0.031 mg/L (S/N= 3), the RSD was 2.5% (n= 9), and a complete sample test could be completed in five minutes. The sensor was used to detect MSBE in MTBE of different purity grades, with recoveries ranging from 92.0% to 109.2%, and the analytical results were consistent with those determined by gas chromatography. These results indicate that the established method was accurate and reliable, and could be used for rapid analysis of MTBE gasoline additive.Keywords:Pt/Au NPs@Co3O4;cataluminescence sensor;methyl sec-butyl ether;methyl tert-butyl ether;rapid analysis;gasoline additive
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