CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Sa Xiao,Lina Zhang,Lian Zhou,Hua Zhong,Mark L Brusseau,Yan Li,Yake Wang,Guansheng Liu,Juntao Zhang
Highly reactive metal-based materials for persulfate activation have been intensively studied for treatment of groundwater contaminants. However, the long-term efficacy of the readily available metal-oxide additives, which can be more important for groundwater remediation practice, has received minimal attention. In this study, the results of preliminary experiments demonstrated that Fe 3 O 4 was superior to seven metal oxides (MnO, Fe 2 O 3 , MnO 2 , CuO, Cu 2 O, CoO, NiO) and zero-valent iron for activating persulfate to degrade 1,2-dichloropropane. Experiments were then conducted to examine the long-term effects of Fe 3 O 4 -activated persulfate degradation of four contaminants, i.e., 1,2-dichloropropane, 1,1,2-trichloroethane, 1,4-dioxane, and methyl tert -butyl ether (MTBE). The system achieved complete removal of the contaminants in approximately 72 h, which was contrasted to a removal efficiency less than 35 % in the absence of Fe 3 O 4 . Highly efficient use of persulfate for contaminant degradation was observed with insignificant production of soluble Fe before depletion of the contaminants. Production of sulfate radical (SO 4 •− ) and hydroxyl radical (HO • ) via surface reactions was likely the process responsible for the degradation. Ten and five cycles of 1,2-dichloropropane degradation experiments were conducted in deionized water and actual groundwater. These results suggested that the Fe 3 O 4 could retain 80 % of its original activation capacity after 5 cycles, but partial oxidation of Fe 3 O 4 eventually occurred. Production of some Cl-containing degradation-resistant intermediates from degradation of 1,2-DCP was observed and could be mitigated under specific conditions. The results show that Fe 3 O 4 has a long-term effect in activating persulfate for contaminant degradation, which is promising for applications such as permeable reactive barriers and nanoparticle injection for groundwater remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yinchuan Yang,Yumin Zhu,Jiabin Chen,Xuefei Zhou,Yalei Zhang
Advanced oxidation processes based on peroxymonosulfate (PMS) hold remarkable promise for addressing emerging organic pollutants (EOPs) and are worthy of systematic investigation. However, the existing technology has not been widely applied due to bottlenecks such as reaction efficiency. Herein, we proposed a novel system incorporating nitrilotriacetic acid (NTA) as a functional ligand to enhance the activation of PMS by Fe 3 O 4 , thereby facilitating a better efficiency for the degradation of EOPs. Results indicated that the system can achieve an optimal removal rate of 99.6% for atrazine (ATZ) in the presence of NTA. Quenching experiments and electron paramagnetic resonance techniques were employed for mechanism exploration. The results revealed that the enhanced Fe(II)/Fe(III) cycling on the surface of Fe 3 O 4 , triggered by the addition of NTA, accelerates the reduction of trivalent iron and continuously activates PMS to generate radicals, particularly SO 4 − . The mechanistic analysis showed that in the first stage, the lower degradation efficiency could due to the self-quenching of the free radicals, with the uncomplexed Fe(II) and Fe(III) on the surface, the free NTA in the solution, or with the PMS, in addition to reacting with the pollutants. In the second stage, the ATZ achieved rapid degradation as the concentration of substances competing for free radicals decreased. Our work elucidates the key role of NTA functional ligand in the Fe 3 O 4 /PMS advanced oxidation processes, which may provide new approach for the efficient degradation of EOPs.
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TALANTA
·
2025
·
IF 6.1
Xiaoting Zhao,Fei Wang,Hong Huang,Lily Chen Wang,Yanxia Qi,Qidong Wang,Yuchun Qiao,Lu Shi,Jizhen Shang,Shuai Li,Hua Wang
Herein, a highly sensitive and selective ratiometric fluorescence platform was constructed for probing adenosine triphosphate (ATP) for the first time by using magnetic Fe 3 O 4 nanozymes that were modified by ATP-specific aptamer labeled with 7-Amino-4-methyl-3-coumarinylacetic acid (Apt-AMCA) to yield Fe 3 O 4 @Apt-AMCA. It was discovered that the incorporation of Apt-AMCA greatly enhance the peroxidase-like activity of Fe 3 O 4 nanozymes, which might catalyze more o -phenylenediamine (OPD) substrates into fluorescent oxidized OPD (DAP) with a emission of 560 nm. More importantly, upon ATP addition, Apt-AMCA could potentially be released from Fe 3 O 4 @Apt-AMCA because of Apt-target binding and the competition between ATP and Apt. The rational increase in the levels of free Apt-AMCA could thereby be attained in the reaction solutions so as to induce an enhancement of fluorescence at 450 nm. Meanwhile, the desorption of Apt-AMCA from the Fe 3 O 4 @Apt-AMCA surface would decrease the peroxidase-like activity of Fe 3 O 4 @Apt-AMCA, thereby reducing its ability to catalyze OPD into fluorescent DAP and thus decreasing fluorescence at 560 nm. A ratiometric fluorescence method was accordingly formulated to permit the sensitive and selective identification of ATP, featuring a linear dynamic range that ranges from 0.10 μM to 80 μM. Accurate measurements of ATP in practical blood samples were also confirmed, promising a new detection method for ATP analysis that can widely applied in clinical laboratories.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Che Han,Yujie Wang,Jintao Liu,Qiangyi Deng,Hongmei Zhang,Shuang Xu,Conglu Zhang
There is growing attention in the removal of microplastics (MPs) from aquatic environment because of their toxicity and difficulty in degradation. Magnetic Fe 3 O 4 is a potential material for MP removal, however, for fabrication of high-efficiency Fe 3 O 4 -based adsorbents, the alkaline synthesis conditions and weak affinity toward MPs must to be addressed. In this study, we developed magnetic α-Fe 2 O 3 /Fe 3 O 4 hybrid adsorbents (MFes) with engineered affinity sites via a facile one-pot synthesis method. During the material formation process, melamine acted as both a nitrogen source for creating N-modified polar adsorption sites and an inducer for formation of α-Fe 2 O 3 /Fe 3 O 4 phase interfaces. The α-Fe 2 O 3 /Fe 3 O 4 phase interfaces provided additional active sites, as evidenced by the enhanced microplastic adsorption performance. The MFe-1.6–100 achieved 92.3 % polystyrene removal at low adsorbent dosage 0.2 g L −1 and showed rapid adsorption kinetics within 25 min, which is superior to most reported values. After five cycles, the removal efficiency could still retain 90 %. Additionally, MFe-1.6–100 exhibited remarkable ion-tolerance for Cl - and NO 3 - . These performances suggest its potential applicability for MPs capture in aquatic environments.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 31
·1-21
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IF 2.8
Abdul Waras,Sun Yukun,Zhao Minqi,Zhao Xinyi,Guo Jiang,Wu Wenling,Zhu Jianfeng
The swift progress in 5G wireless signal propagation and electronic technologies has potentially enhanced the quality of life. Nevertheless, it also raises serious concerns regarding electromagnetic (EM) interference and potential health risks, thereby necessitating the development of novel composites with intense EM wave (EMW) absorption performance, wide bandwidth, lightweight characteristics, and environmental stability. This research provides the synthesis and comprehensive characterization of a novel Fe 3 O 4 -decorated carbon nanofiber (Fe 3 O 4 @C) encapsulated within a polypyrrole (PPy) shell and then embedded in an epoxy matrix, engineered to optimize EMW absorption and mechanical property. The solvothermal synthesis of Fe 3 O 4 @CNFs, followed by in situ polymerization of PPy, yielded a hierarchical structure that synergistically enhanced the magnetic loss, dielectric loss, and interfacial polarization . Structural analyses, including SEM, XRD, FT-IR, and Raman spectroscopy, verified the successful integration of Fe 3 O 4 nanoparticles on the surface of carbon nanofibers (CNF) and their effective encapsulation by PPy, which improves the oxidative stability and impedance matching. The 4 wt% Fe 3 O 4 @CNF/PPy epoxy nanocomposites exhibit the exceptional EMW absorption performance, achieving a minimum reflection loss of − 23.51 dB at 16.08 GHz (2.05 mm thickness) with a superior effective absorption bandwidth (EAB) of 6.40 GHz (11.60–18.00 GHz) at 2.31 mm thickness, ascribed to the synergistic impedance matching and attenuation effects. Moreover, mechanical testing revealed a 9.7% improvement in tensile strength (89.49 MPa) compared to the cured epoxy for the 5 wt% epoxy nanocomposites, attributed to crack-pinning and stress-transfer mechanisms. The incorporation of PPy enhanced charge transport and corrosion resistance, while promoting multiple scattering and polarization effects, and 1-D magnetic CNF significantly improved EMW attenuation and mechanical property. The study underscores the dual functionality of the nanocomposites, merging robust mechanical property with broadband microwave absorption, offering a scalable solution for next-generation EMW absorbers in aerospace and telecommunications.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhuoqun Deng,Nianxi Wang,Yang Wang,Xujing Li,Haixiang Li,Dexun Zou,Yanping Liu
Due to the persistence and toxicity of PAHs, the accumulation of PAHs in soil causes environmental challenges. Utilizing nanoparticles to activate persulfate (PS) is an eco-friendly and cost-effective method for degrading PAHs. Herein, an advanced oxidation system with Fe 3 O 4 and CeO 2 loaded on BC as PS activators (Fe 3 O 4 -Ce@BC/PS) has been constructed, achieving a total removal of 89.34 % of PAHs from soil at 48 h of reaction at room temperature. Notably, High Resolution Transmission Electron Microscope analysis confirmed the presence of a CeO 2 -Fe 3 O 4 heterojunction, and Density functional theory calculations further revealed the key function of this structure. It reduced the adsorption energy of PS (−4.03 eV), thereby improving its utilization efficiency. In addition, during the reaction process, OH and SO 4 − as the main active species collaborated with 1 O 2 , O 2 − and electron transfer to degrade PAHs. In a word, the Fe 3 O 4 -Ce@BC/PS system developed in this study provided an effective solution to the problem of PAHs-contaminated soil.
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MOLECULES
·
2019
·Vol. 24
·期 17
·3039
·
IF 3.06
Yijie Mao,Yu Zhang,Wei Hu,Weiwei Ye
Histamine can be formed by enzymatic decarbonylation of histidine, which is an important indicator of seafood quality. A rapid and sensitive assay method is necessary for histamine monitoring. A fluorescence resonance energy transfer (FRET) assay system based on a carbon dot (CD)-modified nanoporous alumina membrane and Fe3O4@Au magnet nanocomposites has been developed for histamine detection in mackerel fish. CDs immobilized on nanoporous alumina membranes were used as donors, which provided a fluorescence sensing substrate for histamine detection. Fe3O4@Au magnet nanocomposites can not only act as acceptors, but also concentrate histamine from fish samples to increase detection sensitivity. Histamine was detected by the fluorescence signal changes of CDs capturing histamine by an immune reaction. The fluorescence signals of CDs were quenched by Fe3O4@Au magnet nanocomposites via the FRET mechanism. With an increase of histamine, the fluorescence intensity decreased. By recording fluorescence spectra and calculating intensity change, histamine concentration can be determined with a limit of detection (LOD) of 70 pM. This assay system can be successfully applied for histamine determination in mackerel fish to monitor the fish spoilage process in different storage conditions. It shows the potential applications of CDs-modified nanoporous alumina membranes and Fe3O4@Au magnet nanocomposites-based biosensors in the food safety area.Keywords:fluorescence resonance energy transfer;CDs;nanoporous alumina membrane;food safety
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Heshun Jing,Qingtai Xie,Huijuan Su,Yuqi Zhai,Xun Sun,Baorong Duan,Lijun Zhao,Miao Zhang,Caixia Qi,Libo Sun
The research and progress of noble metal catalysts possessing good stability and extended service life holds significant importance in enhancing catalytic efficiency, reducing enterprise costs, and fostering sustainable social development. Here, a hollow magnetic h-Au/PDA@PDA@Fe 3 O 4 catalyst with a double-layer PDA structure was prepared to optimize the stability of gold nanoparticles (NPs) using for the 4-nitrophenol (4-NP) reduction. The research indicates that, despite the initial activity of h-Au/PDA@PDA@Fe 3 O 4 , with a mass-normalized rate ( k’ ) of 176.10 s −1 ·g Au -1 and a Turn Over Frequency (TOF) of 1757 h −1 , being smaller than h-Au/PDA@Fe 3 O 4 with a single-layer structure ( k’ = 461.76 s −1 ·g Au -1 , TOF = 6387 h −1 ), h-Au/PDA@PDA@Fe 3 O 4 exhibits significantly superior stability compared to h-Au/PDA@Fe 3 O 4 . After undergoing 12 cycles of use, the conversion rate of h-Au/PDA@PDA@Fe 3 O 4 decreased by only 4.3 %. After cyclic reaction, the conversion rate of h-Au/PDA@Fe 3 O 4 decreased by as much as 64.8 %. The distinctive hollow double-layer structure of h-Au/PDA@PDA@Fe 3 O 4 , along with the interaction between Au and PDA, contributes significantly to its exceptional activity and stability. The research presented in this paper offers valuable insights and guidance for the suitable construction and industrial application of gold-based nano catalyst with good activity and cyclic stability.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Qing Kang,Tong Lin,Jingbo Jiao,Yidi Liu,Yurong Guo,Chenjing Ma,Xinjun Du,Shuo Wang
Salmonella typhimurium ( S. typhimurium ) contamination has become the main source of foodborne diseases and has substantial effects on human well-being. Herein, we present a nucleic acid-responsive colorimetric biosensor for ultrasensitive detection of S. typhimurium , integrating a multifunctional Fe 3 O 4 @Zr-MOF/GOx nanoprobe with exponential amplification reaction (EXPAR). The system integrates glucose oxidase (GOx) encapsulated within a Zr-based metal-organic framework (Zr-MOF) modified with magnetic Fe 3 O 4 nanoparticles. In the presence of S. typhimurium , the EXPAR reaction is triggered, and the controlled release of GOx is achieved by DNA strand displacement. The detection mechanism leverages GOx-catalyzed glucose oxidation to generate H 2 O 2 , which oxidizes 3,3’,5,5’-tetramethylbenzidine (TMB) for colorimetric signal readout. The biosensor demonstrates high specificity for S. typhimurium , with a detection limit of 2.26 CFU mL⁻¹ , and practical applicability in spiked milk samples, achieving recoveries of 89.6–111.5 %. The strategy employing stimuli-responsive DNA/MOF composites demonstrated significant potential in food quality monitoring and analysis.
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RSC Advances
·
2025
·Vol. 15
·期 13
·10310-10318
·
IF 4.6
Rui Wu,Xi Song,Yulin Wang,Qiang Zhang
Considering that pesticide residues cause significant harm to health and the environment, it is crucial and urgent to fabricate surface-enhanced Raman scattering (SERS) substrates with high sensitivity to detect pesticide residues. In this study, a three-layer structure of multifunctional Fe3O4/GO/Ag nanoparticles (NPs) as an active substrate for SERS was fabricated and comprehensively characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), elemental mapping, and X-ray photoelectron spectroscopy (XPS). The active substrate was used to detect thiram pesticide through SERS. Combined with the synergistic effect, Ag NPs and graphene oxide (GO) possessed high-density and ordered hot spots to enhance the electromagnetic field; therefore, signal amplification and fascinating sensitivity were achieved. The lowest concentration of thiram for clear presentation of the peak was 10−12 mol L−1. There was a satisfactory linear relationship, ranging from 10−10 to 10−4 mol L−1, with a low limit of detection, high sensitivity, satisfactory enhancement factor (EF), stability, and repeatability. In addition, Fe3O4/GO/Ag was successfully applied to identify pesticide residues in a practical sample. Furthermore, the enhancement mechanism, including electromagnetic enhancement and chemical reinforcement, is discussed in detail. Fe3O4/GO/Ag is a potential active substrate for SERS and can be applied for rapid detection in the food industry, environmental fields and biomedicine with fascinating sensitivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hongwei Zhang,Jiazhe Cheng,Kaiyu Liu,Shou-xiang Jiang,Jichao Zhang,Qian Wang,Chuntao Lan,Hao Jia,Zhaoling Li
The challenge of achieving high-performance electromagnetic interference (EMI) shielding films, which focuses on electromagnetic waves absorption while maintaining thin thickness, is a crucial endeavor in contemporary electronic device advancement. In this study, we have successfully engineered hybrid films based on MXene nanosheets and Fe 3 O 4 nanoparticles, featuring intricate electric–magnetic dual-gradient structures. Through the collaborative influence of a unique dual-gradient structure equipped with transition and reflection layers, these hybrid films demonstrate favorable impedance matching, abundant loss mechanisms (Ohmic loss, interfacial polarization and magnetic loss), and an “absorb-reflect-reabsorb” process to achieve absorption-dominated EMI shielding capability. Compared with the single conductive gradient structure, the dual-gradient structure effectively enhances the absorption intensity per unit thickness, and thus reduces the thickness of the film. The optimized film demonstrates a remarkable EMI shielding effectiveness (SE) of 49.98 dB alongside an enhanced absorption coefficient (A) of 0.51 with a thickness of only 180 μm. The thin films with a dual-gradient structure hold promise for crafting absorption-dominated electromagnetic shielding materials, highlighting the potential for advanced electromagnetic protection solutions.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 17
·3801-3810
·
IF 3.286
Huang Yuanlin,Liang Guangzhao,Lin Tianran,Hou Li,Ye Fanggui,Zhao Shulin
The convenience of colorimetric sensors is useful for practical applications. In this work, we constructed a novel colorimetric sensor with magnetic separation ability that can be operated in nearly neutral conditions and achieve one-step detection of metabolites. Magnetic Cu doped Fe 3 O 4 @FeOOH magnetic nanocomposite (Cu/Fe 3 O 4 @FeOOH) with an oxygen vacancy was prepared by a one-step self-assembly hydrothermal method, and fully characterized by different methods. The oxygen vacancy generated by the incorporation of Cu 2+ cations into the Fe 3 O 4 @FeOOH structure was confirmed to be a vital reactive site for enhancing the catalytic activity, which opens up a new way of designing highly efficient enzyme mimics. Benefiting from its inherent horseradish-peroxidase-like activity, a simple and selective enzyme-based colorimetric sensor was developed for one-step detection of H 2 O 2 and cholesterol, and 3,3′,5,5′-tetramethylbenzidine was catalyzed by H 2 O 2 to generate a colored product of oxidized 3,3′,5,5′-tetramethylbenzidine for signaling. H 2 O 2 and cholesterol can be linearly detected in the same range from 0.01 to 0.4 mmol L -1 with detection limits of 0.0075 mmol L -1 and 0.0082 mmol L -1 , respectively. The proposed colorimetric sensor has satisfactory reusability, accuracy, and practicability in human serum samples, indicating its potential application for the detection of different metabolites in the fields of life science and analytical science.
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危险品化学品经营许可证（带存储）