Waste Disposal & Sustainable Energy
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2025
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IF 4.5
Li Dapeng,Zhang Peng,Jin Yang,Li Qing,Li Xinyuan,Chang Ruirui,Ma Ruoxi,Yan Lin,Ge Suxiang,Ma Juntao
Using fly ash (FA) solid wastes as economical carriers to construct Fenton-like catalytic composites with additional functions is more practical than the use of a single catalyst. Understanding the structure and properties of catalysts and carriers is vital to improve performance. Tetranitro iron phthalocyanine (TNFePc) is a highly active molecular catalyst, whose immobilization and Fenton-like heterogeneous catalysis remain unclear. In this study, magnetically recyclable composites of TNFePc@Fe 3 O 4 @FA were successfully fabricated. Further, Fe 3 O 4 nanocrystals decorated on FA surfaces could be used as special functional layer for composite recycling and simultaneous in situ TNFePc synthesis. Peroxides of H 2 O 2 , KHSO 5 , and tert-butyl hydrogen could be effectively activated by composites and transformed into highly reactive radicals. Moreover, molecular oxygen could be activated as well. Model pollutants, methylene blue and oxytetracycline, could be synergistically degraded by the radical oxidation of superoxide, hydroxyl, alkoxy, and sulfate radicals and non-radical oxidation of high-valent iron-oxo species of TNPcFe IV =O. To the best of our knowledge, this is the first design of FA-based composites with dual function, Fenton-like heterogeneous catalysis and magnetic recyclability, for environmental decontamination. Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Mengyuan Wei,Jiaxin Su,Shenghui Xie,Ruiping Hao,Shengkang Hu,Liang He
In heterogenous Fenton systems, organic pollutant degradation mainly occurs at the catalyst surface. Therefore, the surface properties and structure of catalysts are key factors that determine catalytic performance. In this paper, we used in situ thermal oxidation to generate Fe 3 O 4 on the surface of AZVI. The catalyst prepared by thermal oxidation at 375 °C for 1 h showed the best degradation performance for p-nitrophenol compared with unmodified AZVI, and the value of the reaction rate constant k was 3.1 times higher than that of the original powder. Since Fe 3 O 4 is chemically bonded to AZVI, the catalyst exhibits stable cycling properties. After 7 cycles, the modified catalyst continued to show excellent degradation capacity, and more than 97 % degradation was achieved in 15 minutes. In addition, as the number of catalyst cycles increased, more zero-valent iron was exposed, which could enhance the catalyst performance.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Liguo Jin,Hanpeng Liu,Chaofeng Wang,Congyang Mao,Shuilin Wu,Yu Zhang,Zhaoyang Li,Shengli Zhu,Hui Jiang,Zhenduo Cui,Yufeng Zheng,Xiangmei Liu
Due to their poor light penetration, photothermal therapy and photodynamic therapy are ineffective in treating deep tissue infections, such as osteomyelitis caused by Staphylococcus aureus ( S. aureus ). Here, a microwave (MW)-responsive magnetic targeting composite system consisting of ferric oxide (Fe 3 O 4 )/Prussian blue (PB) nanoparticles, gentamicin (Gent), and biodegradable poly(lactic-co-glycolic acid) (PLGA) is reported. The PLGA/Fe 3 O 4 /PB/Gent complex is used in combination with MW thermal therapy (MTT), MW dynamic therapy (MDT), and chemotherapy (CT) to treat acute osteomyelitis infected with S. aureus -infected. The powerful antibacterial effect of the PLGA/Fe 3 O 4 /PB/Gent is determined by the synergistic effects of heat and reactive oxygen species (ROS) generation by the Fe 3 O 4 /PB nanoparticles under MW irradiation and the effective release of Gent at the infection site via magnetic targeting. The antibacterial mechanism of the PLGA/Fe 3 O 4 /PB/Gent under MW irradiation is analyzed using bacterial transcriptome RNA sequencing. The MW heat and ROS reduce the activity of the protein transporters on the bacterial membrane, along with the transport of various ions and the acceleration of phosphate metabolism, which can lead to increased permeability of the bacterial membrane, damage the ribosome and DNA, and accompany the internal protein efflux of the bacteria, thus effectively killing the bacteria.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Shanxin Li,Yijing Sun,Fanjian Meng,Xuzhou Jiang,Hongying Yu
Effective integration of multiple functions into microwave absorbing materials is a future development direction, but still remains a significant challenge. This work fabricated a lightweight, multifunctional aerogel through electrostatic self-assembly, freeze-drying and in-situ pyrolysis process, achieving an in-situ composite of magnetic/dielectric components. The regulated pyrolysis temperature achieves a good balance between abundant nanopores and heterogeneous interfaces, enriched defects, and conductivity. This balance induced a synergy of dielectric loss, magnetic loss, and conduction loss at low frequencies, improving the impedance matching. The aerogel obtains a minimum reflection loss (RL min ) of −65.17 dB in the low-frequency range and a maximum effective absorption bandwidth (EAB max ) of 5.76 GHz. The radar cross section (RCS) simulation confirmed its good stealth performance. In addition, an increase in aerogel loading enhanced its electrical conductivity, resulting in a higher electromagnetic interference (EMI) shielding effectiveness (SE) of 81.83 dB, the specific shielding effectiveness (SSE) up to 359.28 dB·cm 3 /g and the absolute shielding effectiveness (SSE t ) up to 1596.82 dB·cm 2 /g. Beyond microwave absorption and shielding, this aerogel also exhibited good hydrophobicity and thermal insulation. This study provides a new perspective for the development of materials with microwave absorption properties in low-frequency bands and multifunctional properties for broader applications in military, communication, aerospace, and other fields.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 29
·20009-20021
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IF 2.9
Jianwen Hu,Mingshuo Chi,Runna He,Junjie Fan,Haotian Gao,Wenqing Xie,Kunxiu Dai,Shuangqing Sun,Songqing Hu
The surface characteristics of stimuli-responsive Pickering emulsifiers can be modified by external environmental triggers, making them highly versatile in various applications. In this study, we report three novel organic–inorganic composite structure emulsifiers. These emulsifiers were designed with a core of magnetic Fe3O4 particles, surrounded by a protective silica layer, and coated on the exterior with three distinct types of modified chitosan (CS). Experimental results demonstrate that these emulsifiers can stabilize emulsion systems consisting of liquid paraffin and deionized water at a concentration of 0.5 wt%. The unique properties of the modified CS coatings allowed for the controlled demulsification of two types of emulsions by adjusting the proton concentration. Additionally, these emulsifiers exhibited magnetic-responsive demulsification under the control of an external magnetic field. The findings of this study provide valuable insights into the design and construction of multi-responsive chitosan-based magnetic Pickering emulsifiers with controllable properties.
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FOOD CHEMISTRY
·
2025
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IF 9.8
Qianjin Li,Xiaoxiao Hong,Menghua Dou,Shuying Guan,Jianlin Li
Aflatoxin B 1 (AFB 1 ) is the major toxic mycotoxin that contaminates grains at trace levels, necessitating the development of an efficient and simple extraction method to enrich it in samples. Here, magnetic molecularly imprinted Fe 3 O 4 nanoparticles (MMIPs) were first synthesized by employing 5,7-dimethoxy coumarin as the template and methacrylic acid combined with styrene as the functional monomers. These MMIPs exhibited excellent selective recognition capabilities for AFB 1 , based on which, a novel molecularly imprinted magnetic inverse opal photonic crystal microsphere (MIP@MIPCM) was fabricated via a droplet-based microfluidic self-assembly technique. The MIP@MIPCMs enabled specific recognition of AFB 1 and were used as an extraction material, achieving a binding capacity of 842.7 ng/mg within 20 min. Coupled with high-performance liquid chromatography (HPLC), a sensitive and accurate analytical method was established for AFB 1 detection with a detection limit of 0.35 μg/kg and recovery rates of 90–109 % in real samples.
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TALANTA
·
2024
·
IF 5.6
Jianwen Fei,Wei Yang,Yin Dai,Wei Xu,Huizhu Fan,Yani Zheng,Junli Hong,Jun Zhang,Wanying Zhu,Xuemin Zhou
The enzyme-like properties of nanozymes may be considerably affected by the structure and surface groups, which thus need to be optimized. Here, through a simple NaOH chemical corrosion method, the chemical structure similar to N-Methylpyrrolidone (NMP), which possessed intrinsic oxidase-like activity, was introduced into polypyrrole (PPy), and then this nanomaterial became oxygen-functionalized PPy ( o -PPy) with excellent oxidase-like activity from PPy without this property. Furthermore, after compounding magnetic Fe 3 O 4 , the obtained nanocomposites Fe 3 O 4 @o-PPy nanoparticles (Fe 3 O 4 @o-PPy NPs) showed superiorities in separation during synthesis and real-time control of enzyme catalysis . Studies have found that the enzymatic activity of Fe 3 O 4 @o-PPy NPs depended on the amount of functionalized oxygen and the conjugation extent of o -PPy. Fe 3 O 4 @o-PPy NPs had efficient oxidase-like activity under a wide range of pH and temperature. Based on the oxidase-like activity of Fe 3 O 4 @o-PPy NPs, a colorimetric sensor for glutathione (GSH), which presented rich color changes and satisfactory colorimetric resolution by adding the amaranth , was realized. We believe that the functional modification and structural regulation of PPy can not only realize its wider application but also promote the discovery of novel and efficient nanozymes .
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TALANTA
·
2017
·
IF 4.162
Shuo Li,Qiong Wu,Pinyi Ma,Yue Zhang,Daqian Song,Xinghua Wang,Ying Sun
A novel surface plasmon resonance (SPR) biosensor based on hollow gold nanospheres (HGNPs) and an improved sandwich assay was developed to detect rabbit IgG. The electromagnetic coupling between the HGNPs and Au film, and the notable plasmonic fields spread over the inner and outer surfaces of HGNPs, led to the considerable amplification of the SPR signal. [email protected] 3 O 4 /reduced graphene oxide ( [email protected] 3 O 4 /rGO) was introduced to bind detection antibody (Ab 2 ) to form the improved sandwich structure. Ag nanoparticles were excited to produce SPR and their hot electrons were doped on graphene thin films, which amplified the response of biomolecules. Magnetic nanoparticles (Fe 3 O 4 ) simplified the collection of Ab 2 [email protected] 3 O 4 /rGO. An external layer of polydopamine (PDA) permitted the efficient immobilization of Ab 2 without activation via abundant functional groups and protected the nanoparticles from etching or agglomeration. In addition, because of its large mass, Ab 2 [email protected] 3 O 4 /rGO also played a key role in the further amplification of the SPR response signals. This novel SPR biosensor exhibited an effective response to the rabbit IgG at the different concentrations ranging from 0.019 to 40.00 μg mL −1 . This value is 132 times lower than that observed for a traditional SPR biosensor based on Au-3-mercaptopropionic acid and 8 times lower than that obtained from an Ab 2 sandwich assay, which indicates that the SPR sensor has high sensitivity. In addition, the designed biosensor showed satisfactory recoveries to detect the rabbit IgG spiked in serum samples. Therefore, the novel SPR biosensor with high sensitivity and acceptable recovery has potential for practical applications.
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TALANTA
·
2018
·
IF 4.244
Yiwei Tang,Huan Liu,Jingwen Gao,Xiuying Liu,Xue Gao,Xiaonan Lu,Guozhen Fang,Junping Wang,Jianrong Li
Localized photo-polymerization was ingeniously applied to prepare a multifunctional molecularly imprinted polymer (MIP) fluorescent probe using the “layer-by-layer” assembly of MIP and Fe 3 O 4 nanoparticles on NaYF 4 : Yb 3+ , Er 3+ upconversion particles (MUCPs@MIP). Enrofloxacin was used as the template and chosen as the target molecular during the investigation of the adsorption property. This ternary probe has magnetic and broad-spectrum molecular recognition capability, fast response, and upconversion fluorescence. The results of the fluorescence quenching analysis showed good linear ranges of 1.03 nmol/L to 0.28 μmol/L for enrofloxacin, 1.69 nmol/L to 0.22 μmol/L for fleroxacin , 6.92 nmol/L to 0.28 μmol/L for levofloxacin , 7.54 nmol/L to 0.30 μmol/L for ciprofloxacin , and 3.90 nmol/L to 0.25 μmol/L for enoxacin . This probe was further used to determine five quinolones in fish tissues and the recoveries ranging from 90.33% to 108.43% were obtained with relative standard deviation below 5.53%. This work offers a new and general strategy to synthesize a MUCPs@MIP upconversion fluorescence probe with magnetic and selective molecular recognition capability for rapid and accurate sensing of multiple chemical residues in the environment and agri-food products.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qingxiang Wang,Min Liu,Jihong Zhao,Jiahao Yuan,Shasha Li,Ruijiang Liu
The prevention, diagnosis and treatment of cancer have always been the focus of medical research. In this study, a label-free, rapid, simple, sensitive, and specific method for the detection of HPV16 E7 oncoprotein was developed. The electrochemical biosensor platform was constructed by magnetic self-assembly of α-Fe 2 O 3 /Fe 3 O 4 @Au nanocomposites onto the surface of magnetic glass carbon electrode (MGCE), and the nanocomposite was connected to aptamer through Au S bond to construct a probe to capture HPV16 E7. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were applied to verify the performance of the constructed biosensor. The condition optimization and performance analysis were carried out by differential pulse voltammetry (DPV). Under optimal conditions, the biosensor exhibited a strong linearity between current value and the logarithm of HPV16 E7 oncoprotein concentration in the range of 10 pg/mL – 0.1 μg/mL, with a limit of detection (LOD) of 159 fg/mL and a limit of quantification (LOQ) of 530 fg/mL, and it also revealed excellent reproducibility, long-term stability, and anti-interference ability. In a word, the biosensor would contribute to the early diagnosis of oncoprotein HPV16 E7 and had promising application prospects.
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RARE METALS
·
2025
·
IF 11
Zhang Xu,Zhao Ke-Yu,Su Shuang,Zou Zhong-Li,Qian Yong-Qiang,Cheng Kui
With the rapid development of flexible equipment, high-energy/-power requirements have been proposed for energy storage devices. Nevertheless, the poor conductivities of metallic oxides and their low levels of transmission of electrons/ions hinder their widespread application. Here, a sandwich-structured Co 3 O 4 –Fe 3 O 4 (CFO) composite with binder-free was synthesized on a carbon cloth substrate via co-precipitation and partial ion exchange. The appropriate substitution of Co 3 O 4 with Fe 3 O 4 is favorable in promoting the rapid transfer of electrolyte ions and alleviating changes in volume during the electrochemical studies. When the duration of the substitution reaction is 20 min, the obtained electrode delivers a maximum specific capacitance of 1196.2 F g −1 at a current density of 1 A g −1 and a superior capacity retention of ~ 71% when the current density varies from 1 to 30 A g −1 . Furthermore, the fabricated CFO//activated carbon flexible all-solid-state supercapacitor exhibits a respective maximum energy and power density of 68.7 Wh kg −1 and 16,000 W kg −1 and excellent flexibility. It also displays a specific capacity retention of 81.3% under four continuous bending states at a current density of 6 A g −1 over 10,000 cycles. These remarkable electrochemical characteristics suggest that the sandwich-structured CFO composite displays considerable potential for application in flexible high-energy/-power supercapacitors. Graphical abstract
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Huashuai Wang,Can Hao,Lingyun Chen,Dunyi Liu
Cadmium (Cd) pollution poses a significant threat to food safety and human health. Foliar spraying of nanomaterials has been widely used to mitigate Cd stress in agriculture. However, the effects and synergistic mechanisms of various nanomaterial combinations on Cd resistance remain unclear. This study compared the impacts of Fe 3 O 4 nanoparticles (NPs), ZnO NPs, and their combinations at different concentrations (50–400 mg/L) on the growth and physiology of peanuts under Cd-stress. Results showed that combined-NPs reduced Cd accumulation and enhanced plant growth more effectively than single-NPs. Specifically, the concentrations of Cd in roots and shoots were reduced by 52.13 % and 47.83 %, respectively, while biomass increased by 42.86 % for roots and 100.17 % for shoots. A concentration of 150 mg/L of combined NPs was optimal, reducing root Cd concentration from 0.619 mg/g to 0.245 mg/g and shoot from 0.187 mg/g to 0.148 mg/g. Transcriptomic analysis revealed that combined NPs upregulated oxidative stress-related genes ( GST23 , POD2 ) to strengthen antioxidant defenses. Simultaneously, they also downregulated metal transports ( ABCC2 , Nramp2 , ABCG29 , ABCG2 ), potentially limiting Cd uptake. These findings reveal the synergistic mechanism of enhancing antioxidant systems and regulating metal transport pathways, offering a new strategy to develop combined nano-fertilizers that combat Cd pollution in similar crops.
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