JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Jinghan Ren,Jie Wang,Mingqi Guo,Ruonan Li,Yueping Guan
Recovering gold from electronic wastewater is of great significance in alleviating the shortage of metal resources and reducing environmental pollution, especially considering the increasing number of discarded electronic devices. However, the ultra-low concentration of gold and the competitive interference of various metals pose significant challenges. In this work, we used Fe 3 O 4 nanoparticles and quaternary ammonium salt to recover gold from electronic wastewater. The method achieved a gold recovery efficiency of 98.2 % within just 3 min. The mechanism of gold recovery was investigated using techniques such as SEM, EDX, FT-IR, XPS, and XRD. The Au (III) ions were complexed with tetrabutylammonium nitrate to form the [N 4444 ][AuCl 4 ] complex, and this complex then aggregated with Fe 3 O 4 nanoparticles to form nanoclusters, while Fe (II) ions on the surface of Fe 3 O 4 nanoparticles reduced the Au (III) ions to Au (0). This study proposed a mechanism of complexation-aggregation-reduction-separation to recover gold. On application to a simulated electronic wastewater, the method exhibited excellent selectivity for Au (III), achieving a recovery efficiency of 99.1 %. The regeneration of Fe 3 O 4 nanoparticles can be readily performed by ultrasound, retaining a 96.7 % recovery rate of Au (III) even after six consecutive cycles. This study proposed the combination of Fe 3 O 4 nanoparticles and quaternary ammonium salt for gold recovery, which provided an environmentally friendly solution to address the increasing demand for precious metal resources in industry.
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PubMed
高影响因子
ChemMedChem
·
2017
·Vol. 12
·期 19
·1600-1609
·
IF 3.225
Xinyu Hu,Yongmei Wang,Liangliang Zhang,Man Xu,Jianfa Zhang,Wei Dong
Graphical The power of attraction : Salecan-based composite hydrogels have magnetic-field-responsive properties due to the introduction of Fe 3 O 4 @SiO 2 nanoparticles into the hydrogel system. As a model anticancer drug, doxorubicin (DOX) was loaded into the composite hydrogels with high efficiency via strong electrostatic interactions between the amine group in DOX and carboxyl groups present in the hydrogels. These DOX-loaded salecan-g-PPH/Fe 3 O 4 @SiO 2 composite hydrogels show pH-responsive controlled drug release, and the liberated DOX can be effectively taken up by A549 cells. Salecan is a water-soluble extracellular β-glucan and has excellent physicochemical and biological properties for hydrogel preparation. In this study, a new pH/magnetic field dual-responsive hydrogel was prepared by the graft copolymerization of salecan with 4-pentenoic acid (PA) and N -hydroxyethylacrylamide (HEAA) in the presence of Fe 3 O 4 @SiO 2 nanoparticles for doxorubicin hydrochloride (DOX) release. Integration of Fe 3 O 4 @SiO 2 nanoparticles in salecan-g-poly(PA-co-HEAA) copolymers afforded magnetic sensitivity to the original material. DOX-loaded hydrogels exhibited a clear capacity for pH/magnetic field dual-responsive controlled drug release. Lowering the pH to acidic conditions or introducing an external magnetic field caused an enhancement in DOX release. This salecan-g-poly(PA-co-HEAA)/Fe 3 O 4 @SiO 2 composite hydrogel is a promising drug carrier for magnetically targeted drug delivery with enhanced DOX cytotoxicity against A549 cells.
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PubMed
高影响因子
Lubrication Science
·
2024
·Vol. 36
·期 6
·468-477
·
IF 1.8
Han Yu,Min Li,Jianfang Sun,Jingying Su,Fenghua Su
As an emerging two-dimensional material, black phosphorus (BP) has excellent tribological properties, but the poor dispersion of BP in oil inhibits its application in friction to some extent. Surface modification is one of the effective methods to solve the dispersibility of BP, and the use of nano-Fe 3 O 4 dotted on the surface of BP improves the dispersion stability of BP in soybean from 3 days to about 15 days. Compared with pure soybean oil, friction coefficient and wear rate of the addition of 0.12 wt% BP/Fe 3 O 4 are reduced 65% and 78%, respectively. To elucidate the excellent tribological mechanisms of BP/Fe 3 O 4 as additives in soybean oil, the compositional and structural characterisation of the abrasion mark surface was studied accordingly. On the one hand, soybean oil reacts with BP/Fe 3 O 4 to form a composite tribo-film during the scraping process. This tribo-film composed of amorphous carbon, iron oxide and phosphorus oxide nitrides prevents direct contact between the sliding interfaces. On the other hand, BP and Fe 3 O 4 nanoparticles form a mechanical rollerball structure, which can further reduce interfacial friction and wear through synergistic lubrication. The results provide new insights into the design of additives in biomass lubricating oils and propose new application prospects for BP in the field of lubricating additives.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xudong Hu,Jingyi Shang,Xiaolian Zhao,Jun Long,Izaz ul Islam,Shuang Li,Usman Farooq,Xinhai Wang
Fe 3 O 4 @CoFe-LDH, a magnetic composite, and its counterpart, CoFe-LDH, were successfully synthesized via a co-precipitation method and systematically investigated for their performance and mechanism in activating peroxymonosulfate (PMS) for tetracycline (TC) degradation. Fe 3 O 4 @CoFe-LDH possessed a typical LDH structure with Fe 3 O 4 nanoparticles uniformly dispersed in the CoFe-LDH matrix, forming a heterojunction interface that effectively combined the magnetism of Fe 3 O 4 and the high catalytic activity of CoFe-LDH. Magnetic analysis (VSM) indicated a saturation magnetization of 23.93 emu/g for the composite, enabling magnetic separation and recovery within 30 s, significantly enhancing the practical applicability. Under optimal conditions (0.07 g/L catalyst, 0.75 mM PMS, pH 6–8, 25 °C), Fe 3 O 4 @CoFe-LDH/PMS achieved 97.6 % TC (25 mg/L) degradation, outperforming CoFe-LDH (93.9 %). Radical quenching and ESR revealed sulfate radicals (SO 4 •- ) and nonradical ( 1 O 2 ) as dominant species, with Fe 2+ /Fe 3+ –Co 2+ synergism promoting 1 O 2 pathways. Density functional theory (DFT) calculations showed enhanced charge transfer and reduced activation energy at the heterojunction. After four cycles, Fe 3 O 4 @CoFe-LDH retained 82.3 % activity (vs. 73.2 % for CoFe-LDH) and exhibited strong anti-interference (86.8–92.4 % TC removal in natural water), highlighting its engineering potential.
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高影响因子
IONICS
·
2025
·
IF 2.6
Li Chunxiang,Xia Sushuang,Qian Xinmei,Zheng Mingyu,Deng Keqin
Electrocatalyst with high accumulation capacity and efficient electrocatalysis are crucial for constructing electrochemical sensors. In this study, 3D hierarchical nitrogen-doped carbon nanosheets decorated by Fe 3 O 4 /CoFe nanoparticles (Fe 3 O 4 /CoFe@N-CSs) were successfully prepared. The morphology, composition, microstructure, and property were investigated by SEM, HRTEM, XRD, XPS, and cyclic voltammetry. The synthesized Fe 3 O 4 /CoFe@N-CSs were assembled by two-dimensional (2D) nanosheets to form flower-like layered structure. It displayed a large amount of pore space for promoting the accumulation of targets and brilliant electrocatalysis towards the electrochemical oxidation of sunset yellow (SY) and tartrazine (TTZ). Using Fe 3 O 4 /CoFe@N-CSs to modify screen-printed electrode (SPE), a disposable electrochemical sensor (Fe 3 O 4 /CoFe@N-CSs/SPE) was constructed for the analysis of SY and TTZ. It showed the detection range of 0.008–5.0 μM and 0.02–10.0 μM with the detection limit of 2.0 nM and 4.0 nM, respectively. The practical applicability of the sensor in real drink samples provided satisfactory data. The results indicated that Fe 3 O 4 /CoFe@N-CSs was a promising nanomaterial, contributing great potential for individual and synchronous measurement of trace amounts of SY and TTZ in food samples.
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高影响因子
Nanoscale
·
2019
·Vol. 11
·期 39
·18426-18435
·
IF 6.97
Meng Duan,Fangfang Xia,Tianliang Li,Joseph G. Shapter,Sheng Yang,Yongying Li,Guo Gao,Daxiang Cui
This work explored the application of matrix metalloproteinase 2-targeted superparamagnetic nanoprobes for magnetic resonance imaging (MRI), near infrared (NIR) fluorescence imaging and photodynamic therapy of tumors. PEG, PAMAM (G5) and matrix metalloproteinase 2 (MMP2) were attached to the surface of carboxylated Fe3O4 nanoparticles (NPs) using a chemical coupling method and then finally loaded with the photosensitizer chlorin e6 (Ce6). In vitro and in vivo experiments demonstrated that the Fe3O4-PEG-G5-MMP2@Ce6 nanoprobes exhibited excellent stability, precise tumor targeting and biocompatibility. Furthermore, the fluorescence properties of Fe3O4-PEG-G5-MMP2@Ce6 nanoprobes were analogous to Ce6 and could be employed for fluorescence imaging. Meanwhile, the Fe3O4-PEG-G5-MMP2@Ce6 nanoprobes have also been shown to be effective as contrast agents for T2-weighted MRI. The target molecule MMP2 enhanced the tumor targeting ability of Fe3O4-PEG-G5-MMP2@Ce6 nanoprobes. Additionally, the Fe3O4-PEG-G5-MMP2@Ce6 nanoprobes significantly inhibited tumor growth compared with PBS and free Ce6. This work will inspire greater enthusiasm for the construction of multifunctional magnetic nanoplatforms for biomedical applications.
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PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Mengke Zhang,Mengyin Li,Yan Zhao,Naifeng Xu,Lanlan Peng,Yuanfeng Wang,Xinlin Wei
In this study, a rapid sandwich immunochromatographic assay (ICA) was developed to detect parvalbumin (PV). Firstly, two optimum primary monoclonal antibody (mAb) against PV had been screened out: mAb1 was used as the capture antibody, and mAb2 conjugated to Fe 3 O 4 /Au nanoparticles (Fe 3 O 4 /AuNPs) that served as a detection reagent. Using this pair of mAbs, a sandwich ICA strip based on Fe 3 O 4 /AuNPs was developed. The results showed that the color intensity of test line positively correlated with the PV concentration in the standard or spiked sample. The limit of detection for qualitative (LOD) and quantitative detection (LOQ) were 2 ng/mL and 0.691 ng/mL, respectively. Besides, the detection time of this ICA strip was within 15 min. The recovery rates ranged from 104.0% to 117.4%, within an acceptable level (80–120%). Moreover, the developed assay also showed high cross reaction in different fish species. These results demonstrated that the established test strip has the potential to be used as a rapid screening tool for large scale determination of PV in foodstuffs.
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高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Shengwen Zhou,Rui Yang,He Yan,Guixian Zhu,Xingwu Lu,Xiuwen Cheng
The development of a low-cost catalytic system using waste copper slag to activate peroxymonosulfate (PMS) for tetracycline (TC) degradation in water represents a green and efficient pathway. In this study, magnetic FeOOH@Fe₃O₄ nanoparticles were synthesized from copper slag and applied in a material/PMS system to degrade TC. Experimental results demonstrated a remarkable 99 % TC removal efficiency within 30 min. Characterization analysis revealed that the amorphous structure of FeOOH promotes the formation of amorphous zones and multiphase interfaces, thereby exposing more active sites and enhancing catalytic activity. This effect, combined with the large specific surface area of Fe₃O₄, significantly accelerated the degradation rate. Notably, the material maintained an 80 % degradation efficiency even after five reuse cycles. The reaction mechanism involves multiple pathways, including free radical and non-free radical mechanisms, as well as adsorption and electron transfer, with the non-radical singlet oxygen ( 1 O₂) being the predominant reactive species. Furthermore, the study proposes potential degradation intermediates and outlines possible degradation pathways for TC, while also predicting associated toxicity changes. This research provides a novel methodology for developing environmental functional materials from solid waste, offering valuable insights for addressing the dual challenges of waste disposal and the degradation of emerging pollutants.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuxiang Sun,Li Xu,Xin Liu,Yaodong Shen,Yu Zhang,Ning Gu,Fei Xiong
Superoxide anion (O 2 •-), hydrogen peroxide (H 2 O 2 ), hydroxyl radical (•OH) are the main components of endogenous reactive oxygen species (ROS), while •OH shows the most significant cytotoxicity to tumor cells. Thus effective and continuous •OH generation is critical to ROS-based tumor treatment. Herein, we assembled coronal-shaped Fe 3 O 4 @CeO 2 nanoparticles (NPs) to achieve relay conversion of O 2 •- → H 2 O 2 → •OH in acute myeloid leukemia (AML) cells, where CeO 2 NPs function as the mimetic enzyme of superoxide dismutase (SOD) to convert O 2 •- → H 2 O 2 and Fe 3 O 4 NPs act as the peroxidase (POD) mimetic enzyme to realize H 2 O 2 → •OH. We found that assembled Fe 3 O 4 @CeO 2 got an enhanced POD activity and SOD activity due to the mechanism of more efficient relay conversion at sub-nanometer distance. As a result, assembled Fe 3 O 4 @CeO 2 successfully promoted the relay conversion of O 2 •- → H 2 O 2 → •OH in vitro and in AML cells, causing a continuous generation of •OH by utilizing the oxygen source of endogenous O 2 •- and endogenous H 2 O 2 . In AML cells, reportedly, O 2 •- and H 2 O 2 were both in high levels and the generation of O 2 •- is sustainable. Furthermore, Fe 3 O 4 @CeO 2 -driven the endogenous ROS axial conversion exacerbated AML cells apoptosis and prolonged the survival time of systemic AML mice, showing the worth of this relay conversion mechanism. Therefore, assembled Fe 3 O 4 @CeO 2 provides an ideal tool for the directed conversion of intracellular ROS and continuous generation of •OH. Importantly, the targeted conversion of ROS by assembling multi-enzyme system is an effective strategy for the intervention of ROS.
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高影响因子
NANO
·
2015
·
IF 1.09
Desheng Xi,Xiaojuan Deng,Huijun Li,Pei Yao
Allura red (AR) is a water-soluble synthetic colorant often used as an additive in the food industry, but excess AR can be harmful to human health. In this work, we report the development of a new removal method for AR by using amino-functionalized microspheres with Fe 3 O 4 cores and twolayer shells composed of SiO 2 particles and perpendicularly aligned mesoporous SiO 2 (designated Fe 3 O 4 @nSiO 2 @mSiO 2 –NH 2 ). The material exhibits good dispersibility in aqueous solutions and a high saturation magnetization of 45.68 emu g − 1 , and can be magnetically separated efficiently with an external magnet. Importantly, the material has great adsorption capacity of 29.6 mg g − 1 for AR and the capacity for reuse with a simple treatment. The adsorption process is very fast and the kinetics data are consistent with a pseudo-second order model. Based on these, a rapid and efficient method for extraction and analysis of AR in water and soft drinks has been established.
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高影响因子
Chinese Physics B
·
2016
·Vol. 25
·期 8
·088201
·
IF 1.436
Chao Li,Jun-Jie Sun,Duo Chen,Guang-Bing Han,Shu-Yun Yu,Shi-Shou Kang,Liang-Mo Mei
A facile step-by-step approach is developed for synthesizing the high-efficiency and magnetic recyclable Fe3O4@SiO2@Ag@Ni trepang-like nanocomposites. This method involves coating Fe2O3 nanorods with a uniform silica layer, reduction in 10% H2/Ar atmosphere to transform the Fe2O3 into magnetic Fe3O4, and finally depositing Ag@Ni core-shell nanoparticles on the L-lysine modified surface of Fe3O4@SiO2 nanorods. The fabricated nanocomposites are further characterized by x-ray diffraction, transmission electron microscopy, scanning electron microscope, Fourier transform infrared spectroscopy, and inductively coupled plasma mass spectroscopy. The Fe3O4@SiO2@Ag@Ni trepang-like nanocomposites exhibit remarkably higher catalytic efficiency than monometallic Fe3O4@SiO2@Ag nanocomposites toward the degradation of Rhodamine B (RhB) at room temperature, and maintain superior catalytic activity even after six cycles. In addition, these samples could be easily separated from the catalytic system by an external magnet and reused, which shows great potential applications in treating waste water.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Shuhuai Li,Chaohai Pang,Xionghui Ma,Yuwei Wu,Mingyue Wang,Zhi Xu,Jinhui Luo
To broaden the applicability of electrochemiluminescence (ECL) sensors toward the sensitive and selective detection of trace antibiotic residues, new ECL reagents are required. Herein, a novel molecularly imprinted sensor based on an aggregation-induced ECL reagent was fabricated for the sensitive detection of ciprofloxacin (CFX). A covalent organic framework with aggregation-induced ECL (COF-AIECL) was synthesised using a boric acid condensation dehydration reaction. Then, an electrode surface was modified with COF-AIECL as a signal element and nanozymatic ferriferrous oxide@platinum nanoparticles (Fe 3 O 4 @Pt NPs) as a signal amplification element. Subsequently, using CFX as a template molecule, a molecularly imprinted polymer (MIP) was fabricated on the modified electrode. The ECL signal of COF-AIECL was catalytically amplified by the Fe 3 O 4 @Pt NPs, whereas CFX effectively quenched this signal. Consequently, the ECL signal was controlled by CFX elution from and adsorption by the MIP, thus establishing a new method for CFX detection. The sensitivity of the sensor was greatly enhanced by the aggregation-induced luminescence effect and nanozyme amplification, whereas the MIP effectively improved the selectivity for CFX. Under optimal conditions, the electrochemical sensor exhibited a linear detection range of 2 × 10 −12 to 3 × 10 −9 mol L −1 , with a detection limit of 5.98 × 10 −13 mol L −1 . Furthermore, in untreated milk samples, CFX recoveries of 92.0%–111% were achieved. Thus, the developed sensor exhibited good reproducibility, stability, and selectivity for CFX detection.
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高影响因子
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