CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yue Guo,Yanchun Tao,Xiaowei Ma,Jing Jin,Sisi Wen,Wei Ji,Wei Song,Bing Zhao,Yukihiro Ozaki
Mercuric ion (Hg 2+ ) is a toxic metal ion in the environment, which will seriously damage the people's health. Therefore, the simple sensitive detection of Hg 2+ is of great significance. In this work, Ag-CoFe 2 O 4 /reduced graphene oxide (rGO) nanocomposites were synthesized via a one-pot microwave-assisted reaction, which can directly oxidize 3, 3′, 5, 5′-tetramethylbenzidine (TMB) to produce a light blue. Then we have developed a dual colorimetric and SERS detection of Hg 2+ based on the stimulus of intrinsic oxidase-like catalytic activity of Ag-CoFe 2 O 4 /rGO nanocomposites. It is demonstrated that the interaction between Hg 2+ and Ag nanoparticles can occur in a short time, which includes the formation of Ag-Hg alloy due to the reduction of Hg 2+ . In addition, the formation of such alloy can enhance the oxide-like activity, which makes the detection of Hg 2+ more sensitive. By using the SERS detection approach, the assay can detect Hg 2+ as low as 0.67 nM. This detection ability is much better than previous reports based on the enzyme-like catalytic reaction, which is also lower than the maximum value of Hg 2+ permitted in drinking water by the World Health Organization (WHO) (30 nM) and United States Environmental Protection Agency (EPA) (10 nM). In addition, this detection system also shows an excellent selectivity toward Hg 2+ due to the affinity of Hg to Ag-CoFe 2 O 4 /rGO nanocomposites. Therefore, this approach is potentially applicable for the sensitive determination of Hg 2+ in real environmental conditions.
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JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Hong Yuan,Qingze Jiao,Shenli Zhang,Yun Zhao,Qin Wu,Hansheng Li
The composites of hollow CoFe 2 O 4 and carbon nanotubes (h-CoFe 2 O 4 @CNTs) are successfully prepared by using a simple hydrothermal process coupling with the in-situ chemical vapor deposition (CVD) as electrocatalytic materials for counter electrode of dye-sensitized solar cells. The CNTs are uniformly grown on the surface of hollow CoFe 2 O 4 particles verified by X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) measurements. The electrochemical performances of hollow CoFe 2 O 4 @CNTs composites are evaluated by the EIS, Tafel polarization and CV measurements, and exhibiting high electrocatalytic performance for the reduction of triiodide. The presence of conductive polypyrrole nanoparticles could further improve the conductivity and catalytic performance of the resultant composites. Controlling the thickness of composites film , the optimum photovoltaic conversion efficiency of 6.55% is obtained, which is comparable to that of the cells fabricated with Pt counter electrode (6.61%). In addition, the composites exhibit a good long-term electrochemical stability in I 3 − /I − electrolyte.
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TALANTA
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2025
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IF 6.1
Zhihua Zhao,Shixin Ma,Zijie Su,Huiqin Li,Qilin Zou
The development of triboelectric nanogenerator (TENG)-powered gas sensors capable of actively harvesting environmental energy has become critically important in today's energy-conscious world. This study presents a triethylamine (TEA) gas sensor based on a PVA/MXene/CoFe 2 O 4 nanocomposite hydrogel TENG, utilizing heterointerface-rich MXene/CoFe 2 O 4 nanomaterials combined with polyvinyl alcohol (PVA) polymer matrix. Systematic characterization via XRD, XPS, SEM, and TEM elucidated the composite's elemental composition and microstructure. The PTMC-7 TENG-powered sensor demonstrated exceptional electrical output, generating 170 V open-circuit voltage under 7 N contact force at 1 Hz frequency - sufficient to power 30 LEDs through rectifier-integrated circuits. Its silicone encapsulation enabled finger-joint mounted micro-motion detection. The sensor exhibited 105.11 % response to 100 ppm TEA at room temperature with fast response/recovery (31 s/23 s) and outstanding stability (<3.2 % degradation over 30 days). By converting TENG output modulation into gas concentration readings, this design achieves battery-free TEA detection while synergistically integrating energy harvesting and sensing functionalities, establishing a novel paradigm for flexible sensor development.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Tao-Long Wu,Xiu-Niang Tan,Tian-Tian Nong,Yu-Jie Pan,Peng-Fei Qiu,Jia-Qi He,Yan Zhou,Xue-Cai Tan,Zai-Yin Huang,Lei Han
Owing to the high specific surface area, rich active sites, well-controlled morphology and structural stability with tunable compositional components, the rational combination of hybrid nanostructured materials from metal-organic frameworks templates has become highly attractive and still of great challenge for supercapacitors. In this work, three bimetallic metal–organic frameworks Co 1-x Fe x -MOF-74/NF ( x = 0.25, 0.5 and 0.75 ) nanoarrays with different proportional Co/Fe ratios on nickel foam have been successfully designed and fabricated via in-situ interfacial growth method, which were further controllable converted to α-Co(OH) 2 /CoFe 2 O 4 nanoarrays with different proportional Co/Fe ratios CF-x/NF ( x = 0.25, 0.5 and 0.75 ) without structure collapse through alkaline etching process. Among them, the transformation of the bamboo-shoot-like CF-0.75/NF electrode displays excellent electrochemical properties with high area capacitance (3941.14 mF/cm 2 at 2 mA/cm 2 ), good rate capability, low resistances and remarkable cycling stability. The CF-0.75//AC ASC device delivers a high energy density of 0.16 mWh/cm 2 at a power density of 0.756.1 mW/cm 2 . And this CF-0.75//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This strategy could be extend to form other unique bimetallic hybrids nanoarrays architectures with enhanced electrochemical activity for high-performance energy storage devices.
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高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Chong Jia,Ying Wu,Lijie Xu,Shuguang Han,Lu Gan
Herein, binary composite catalysts based on MnO 2 and CoFe 2 O 4 were prepared to degrade bisphenol A (BPA) and dimethyl phthalate (DMP) by coupling with peroxymonosulfate (PMS), in which CoFe 2 O 4 was located either at the outer (MnO 2 @CoFe 2 O 4 ) or at the inner (CoFe 2 O 4 @MnO 2 ) positioning. The catalysts possessed higher degradation efficiency than both pristine CoFe 2 O 4 and MnO 2 , in which MnO 2 @CoFe 2 O 4 provided the highest PMS activation capability. The positioning of each component influenced significantly the variety and intensity of the generated reactive oxidative species, in which MnO 2 @CoFe 2 O 4 generated more hydroxyl radical ( OH) whereas CoFe 2 O 4 @MnO 2 generated more non-radical singlet oxygen ( 1 O 2 ). Therefore, MnO 2 @CoFe 2 O 4 could degrade both BPA and DMP with high degradation rate, while CoFe 2 O 4 @MnO 2 only exhibited promising degradation efficiency towards BPA since DMP was inert to 1 O 2 . Comparatively, CoFe 2 O 4 @MnO 2 had better catalytic stability and water matrix adaptability than MnO 2 @CoFe 2 O 4 when degrading BPA, since OH was vulnerable water with complicated compositions. This study provides a new insight for the design and selection of composite catalyst towards the degradation of organic pollutants with discrepant structures and properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Shi-Wen Lv,Jing-Min Liu,Ning Zhao,Chun-Yang Li,Fei-Er Yang,Zhi-Hao Wang,Shuo Wang
Photocatalysis is a promising strategy to remove contaminants from wastewater. Herein, a novel g-C 3 N 4 @CoFe 2 O 4 /Fe 2 O 3 composite was synthesized via a feasible hydrothermal and calcination method. Benefiting from the Z-scheme heterojunction formed between MOF-derived CoFe 2 O 4 /Fe 2 O 3 and g-C 3 N 4 , the recombination of photoinduced electrons and holes could be inhibited effectively. Meanwhile, doping a little amount of MOF-derived CoFe 2 O 4 /Fe 2 O 3 could remarkably enhance visible light absorption ability of g-C 3 N 4 and reduce band gap of g-C 3 N 4 . Then, the resulting hybrid photocatalysts were employed as a high-efficient mediator to activate persulfate for degrading emergent organic contaminants under visible light irradiation. Significantly, TC of 99.7%, BPA of 98.1%, SMX of 94.8%, DFC of 97.0%, IBP of 96.1% and OFX of 96.5% could be removed within 80 min. Some important factors influencing photocatalytic degradation process were also investigated. The trapping experiments and EPR tests revealed that both SO 4 − and OH were involved in photocatalytic reaction. Besides, the introduction of MOF-derived CoFe 2 O 4 /Fe 2 O 3 provided a new approach for generating radical species. More importantly, obtained g-C 3 N 4 @CoFe 2 O 4 /Fe 2 O 3 -2 composites with good stability exhibited great application potential in the actual degradation tests. To sum up, current work provided novel ideas for photocatalytic oxidation technology in the organic pollution degradation.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Xiao-Jie Yu,Jin Qu,Zuoying Yuan,Peng Min,Shu-Meng Hao,Zhong-Shuai Zhu,Xiaofeng Li,Dongzhi Yang,Zhong-Zhen Yu
Macroscopic three-dimensional catalytic materials could overcome the poor operability and avoid secondary pollution of common powdery counterparts, especially in flow-type setups. However, conventional isotropic graphene-based aerogels and foams have randomly distributed graphene sheets, which may cause stream erosion and reduce the flux seriously. Herein, for the first time, we design and fabricate a novel anisotropic CoFe2O4@graphene hybrid aerogel (CFO@GA-A) with a hydrothermal synthesis followed by directional-freezing and freeze-drying for a tube-like flow-type setup analogous to a wastewater discharge pipeline. The long and vertically aligned pores inside the aerogel provide an exceptional flux of 1100 L m–2 h–1, 450% higher than that of the rough and zigzag paths in the isotropic CoFe2O4@graphene hybrid aerogel (CFO@GA-I), and the leaching of metal ions is obviously inhibited by relieving the erosion of CoFe2O4. Besides, the CFO@GA-A could sustain the scour of high-speed flowing wastewater and maintain its structural stability. Therefore, organic contaminants of indigo carmine, methyl orange, orange II, malachite green, phenol, and norfloxacin could readily flow over the nanocatalysts and be degraded rapidly within 7.5–12.5 min at varied flow rates from 60 to 120 mL h–1. The CFO@GA-A also exhibits a much better long-term stability with removal efficiencies toward indigo carmine at 100%, 91%, and 85% for at least 30 h (60 mL h–1), 25 h (90 mL h–1), and 21 h (120 mL h–1), respectively. On the contrary, the CFO@GA-I exhibits unsatisfactory removal efficiencies of <40%. Interestingly, CFO@GA-A could also serve as building blocks to stack on each other for degrading intense flowing wastewater, exhibiting an outstanding composability. The high-flux and long-term stability make the CFO@GA-A promising as an ideal catalytic material for wastewater treatments.
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高影响因子
CARBON
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2025
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IF 11.6
Huiyang Jiang,Ying Huang,Xiaoxiao Zhao,Meng Zong
As a representative transition metal dichalcogenide (TMD), MoS 2 exhibits a tunable bandgap, facile defect generation, controllable electrical conductivity, and high stability, positioning it as a promising dielectric material. However, its limited single-cycle dielectric loss capacity and impedance mismatch hinder its standalone microwave absorption performance. To address these limitations, compositing MoS 2 with magnetic components has been demonstrated as a viable strategy to optimize impedance matching and enhance absorption efficiency. This study innovatively developed a sandwich-structured composite film featuring polyacrylonitrile-derived carbon nanofibers (CNF) as flexible scaffolds, synergistically integrated with magnetic CoFe 2 O 4 nanoparticles and dielectric MoS 2 nanosheets. Through electrospinning combined with pressure-assisted thermal molding processes, precise regulation of the CNF-(MoS 2 /CoFe 2 O 4 ) (CMC) heterointerfaces was achieved. The CMC exhibits superior microwave absorption through multiple loss mechanisms. Two-dimensional (2D) MoS 2 nanosheets facilitate polarization relaxation and dielectric loss, while nano-sized CoFe 2 O 4 particles induce eddy current loss. Additionally, the high-aspect-ratio CNF constructs a three-dimensional (3D) conductive network that enhances conduction loss. Moreover, the uneven charge distribution at the heterogeneous interface induces polarization relaxation losses. Experimental results indicate that the optimized CMC sample achieves a minimum reflection loss (RL min ) of −45.6 dB at 14.2 GHz, with a matching thickness of 3.0 mm. This sample also exhibits an effective absorption bandwidth (EAB) of 7.8 GHz (ranging from 10.2 to 18 GHz) and a thermal conductivity of 0.163 W/(m·K). This research introduces a novel thin-film material design paradigm for the synergistic optimization of electromagnetic protection and thermal management in microelectronics. Furthermore, the layered composite strategy paves the way for the development of multifunctional microwave absorption materials.
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BIORESOURCE TECHNOLOGY
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2023
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IF 11.4
Shuo Li,Yingnan Liu,Heshan Zheng,Junfeng Niu,Yoong Kit Leong,Duu-Jong Lee,Jo-Shu Chang
Corn straw and sludge-derived biochar composite (BC) loaded with CoFe 2 O 4 was successfully prepared to activate peracetic acid (PAA) for efficient degradation of tetracycline hydrochloride (TCH). Within 60 s, 96 % TCH removal efficiency was achieved through a non-free radical degradation pathway, primarily driven by singlet oxygen ( 1 O 2 ). The mechanism involves the electron-rich groups on the biochar surface, which facilitate the cleavage of the PAA O O bond to generate •O 2 − / 1 O 2 and provide electrons to induce the formation of high-valent Fe(IV) and Co(IV). The oxygen vacancies on the surface of the CoFe 2 O 4 -loaded biochar composite (CFB-2) contribute partially to 1 O 2 production through their transformation into a metastable intermediate with dissolved oxygen. Moreover, elevated temperatures further enhance PAA activation by CFB-2, leading to increased reactive oxygen species (ROS) production through PAA decomposition, thereby promoting TCH removal. This study offers new insights into the catalysis of metal-loaded biochar for efficient TCH degradation via non-free radical generation.
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高影响因子
危险品化学品经营许可证（带存储）