Nanoscale
·
2015
·Vol. 7
·期 18
·8495-8502
·
IF 7.394
Shouting Zhang,Hua Li,Zhiyi Wang,Jian Liu,Haoli Zhang,Baodui Wang,Zhengyin Yang
We have developed an efficient strategy for synthesizing a strongly coupled Au/Fe3O4/GO hybrid material to improve the catalytic activity, stability, and separation capability of Au nanoparticles (NPs) and Hg2+. The hybrid material can be synthesized by the direct anchoring of Au and Fe3O4 NPs on the functional groups of GO. This approach affords strong chemical attachments between the NPs and GO, allowing this hybrid material to ultrasensitively detect Hg2+ in aqueous solutions with a detection limit as low as 0.15 nM. In addition, the deposition of Hg0 on the surface of Au/Fe3O4/GO could be quickly (within 30 min) and efficiently (>99% elimination efficiency) removed by the simple application of an external magnetic field and then Au/Fe3O4/GO could be subsequently reused at least 15 times, with the elimination efficiency remaining high (>96%).
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 11
·8111-8120
·
IF 4.6
Hao Zhang,Weihao Ma,Chunyu Qiang,Jiayuan Nie,Ling Ma,Yawei Zhang,Ke Wang
In our research, an emerging magnetic covalent organic framework (Fe3O4@SiO2–BD–DADB-COF) was formulated through Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), etc. Several parameters affecting the extraction process were refined. Accordingly, a novel method of determining 15 macrolides (MALs) in honey and water was established through the Fe3O4@SiO2–BD–DADB-COF as a magnetic solid-phase extraction (MSPE) adsorbent and ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). In consequence, the standard curves for the 15 MALs exhibited an exceptional linearity from 0.1 to 200 μg L−1, and the correlation coefficients (R2) varied from 0.9990 to 0.9999. The recoveries fell between 70.01% and 115.56%, with the relative standard deviations (RSDs) being below 9.93% (n = 5). The detection limits reached 0.001–0.075 μg L−1 with the quantification limits being 0.004–0.228 μg L−1. Ultimately, the method was excellently applied to the analysis of MALs in honey and water.
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yan Qiao,Menglin Wang,Erling Guo,Ke Wang,Ling Ma,Kaoqi Lian
This study aimed to design and synthesize a novel adsorbent Fe 3 O 4 @SiO 2 @MPA-TAPA-COF material for the first time and used as an adsorbent of MSPE. It had significant potential for the pretreatment of trace analytes. The MSPE was coupled with ultra performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS) for the rapid extraction and detection of 12 sulfonamides (SAs) from water and milk samples for the first time. Several experimental parameters were optimized, including adsorbent dosage and the effects of pH, ionic strength, adsorption time, and desorption conditions. Under the optimized pretreatment and instrumental conditions, good linearity of 0.1–100 μg·L −1 with a correlation coefficient 0.9994–0.9999, low limits of detection (0.004–0.044 μg·L −1 ) and limits of quantitation (0.013–0.136 μg·L −1 ) were obtained. Moreover, the recoveries of sulfonamides in water and milk samples were in the range of 60.88 %-102.94 %, and the relative standard deviations not exceeding 9.62 %. Finally, the magnetic Fe 3 O 4 @SiO 2 @MPA-TAPA-COF material possessed the magnetic separation and high adsorption affinity for extracting SAs from real samples. This study holds great significance in enhancing the monitoring of SAs drug residues in water and milk.
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MICROCHIMICA ACTA
·
2011
·Vol. 174
·期 1
·31-39
·
IF 2.578
Cui Lin,Ai Shiyun,Shang Kun,Meng Xiaomeng,Wang Chengcheng
We have prepared a glassy carbon electrode modified with poly-2,6-pyridinedicarboxylic acid and with magnetic Fe 3 O 4 nanoparticles. This modification enhances the effective surface area and the electrocatalytic oxidation of nicotinamide adenine dinucleotide (NADH) in addition to providing positively charged groups for electrostatic assembly of the phosphate group of NADH. The modified electrode responds linearly to NADH in the range from 5 × 10 −8 to 2.5 × 10 −5 M and gives a lower detection limit of 1 × 10 −8 M. It displays satisfactory selectivity and reproducibility. The sensor was applied to rapid screening of plant extracts for their antioxidant properties.
Poly-2,6-pyridinedicarboxylic acid (PDC) was fabricated by electropolymerizing 2,6-pyridinedicarboxylic acid with cyclic voltammetry (CV) on the glassy carbon electrode (GCE) surface. The magnetic Fe 3 O 4 nanoparticles treated with aminopropyltriethoxysilane (APTS) modified on the PDC/GCE to form APTS-Fe 3 O 4 /PDC composite film. The APTS-Fe 3 O 4 /PDC film had enhanced the effective electrode surface area and provided positively charged groups for electrostatic assembly of phosphate group of NADH.
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RSC Advances
·
2013
·Vol. 3
·期 33
·13915-13925
·
IF 2.562
Leyong Zeng,Lingchao Xiang,Wenzhi Ren,Jianjun Zheng,Tianhua Li,Bin Chen,Jichao Zhang,Chengwen Mao,Aiguo Li,Aiguo Wu
Due to non-invasive deep imaging and therapy, multifunctional agents of magnetic resonance (MR)/upconversion luminescence (UCL) imaging and photodynamic therapy (PDT) play an important role in clinical diagnosis and treatment of cancers, and also in the assessment of therapy effect. In this paper, tetra-sulfonic phthalocyanine aluminium (AlPcS4) photosensitizers-conjugated Fe3O4@NaYF4:Yb/Er (NPs-AlPcS4) nanocomplexes were synthesized for the T2-weighted MR/UCL imaging and PDT of cancer cells. The PEG-coated Fe3O4@NaYF4:Yb/Er nanoparticles (NPs) with a core–shell structure showed strong T2-weighted MR relaxivity (r2 = 42.131 mM−1 s−1) and UCL emission in the visible region (the bands at about 654–674 nm, 545 nm and 524 nm), and were conjugated successfully with AlPcS4 photosensitizer by electrostatic interaction. By direct observation of XFM and staining with Prussian blue, the element distribution and location of NPs in MCF-7 cells were characterized, respectively. Under irradiation from a 980 nm laser, the death ratio of MCF-7 cells incubated with NPs-AlPcS4 nanocomplexes could be up to about 70%. The results indicated that the as-prepared NPs-AlPcS4 nanocomplexes would be a potential candidate as multifunctional nanoprobes for the dual-modal T2-weighted MR/UCL imaging and PDT of cancers in the future.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·4091-4098
·
IF 4.58
Liu Haochi,Chen Ligang,Ding Jie
The authors describe an efficient method for the extraction of tetracycline antibiotics (TCs) from water samples by using a new kind of core-shell adsorbent. It consists of a magnetite (Fe 3 O 4 ) core and a metal-organic framework (type ZIF-8) as the shell. The sorbent has a large specific surface and superparamagnetic response. The sorbent was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, nitrogen adsorption, and X-ray diffraction. The adsorption isotherms, dynamic adsorption, and mechanisms of interactions between tetracycline and sorbent were studied. Various parameters affecting the extraction efficiency were optimized. Following desorption of the TCs with methanol (containing 1% of acetic acid), they were quantified by using ultra-high performance liquid chromatography combined with mass spectrometry. The method has a linear range that extends from 0.5 to 50 ng·L −1 , and the limits of detection for tetracycline, chlortetracycline, and oxytetracycline are 0.125, 0.122 and 0.143 ng·L −1 , respectively. The relative standard deviations of intra-day and inter-day assays range from 3.3% to 8.5%, and from 2.8% to 8.3%, respectively. The recoveries of TCs (at spiking levels of 0.5, 5.0 and 50 ng·L −1 ) are in the range between 78.3% and 93.7%. The method was successfully applied to the determination of TCs in spiked river water, fish pond water, and livestock wastewater.
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CHEMOSPHERE
·
2022
·
IF 8.943
Ze-Yu Liu,Wen-Qian Huang,Chuan-Qing Huang,Zhao-Zhen Liu,Xiao-Yue Tang,Wei-Chang Chen,Zheng-Zheng Tang,Yu-Xing Huang,Shuo-Chun Zheng,Lin Lin,Changzhu Li,Yong Ye
Photocatalytic disinfection is considered a promising method for eliminating the hazards of pathogenic bacteria. Graphitic carbon nitride (g-C 3 N 4 ) is an ideal photocatalytic bacterial inactivation material for its advantage of tunable band structure, good stability and easy preparation. This work has constructed a novel defective 3D porous g-C 3 N 4 by cyanamide carbonation using dendritic mesoporous silica template. The direct loading of Fe 3 O 4 nanoparticles provided an excellent pg–C 3 N 4 –Fe 3 O 4 photocatalyst suitable for water disinfection . Compared to pristine g-C 3 N 4 , the prepared 3D porous defective g–C 3 N 4 –Fe 3 O 4 exhibited the enhanced visible light absorbance as indicated by the band gap decreasing of 0.66 eV, and about 3 and 10 fold increase of photo-induced current response and O 2 adsorption respectively. The pg–C 3 N 4 –Fe 3 O 4 showed excellent visible-light-driven photocatalytic bactericidal activity. It could kill 1 × 10 7 cfu mL −1 Escherichia coli completely within 1 h under visible-light illumination (100 mW cm −2 ) with good reusability, its logarithmic bacterial inactivation efficiency was about 2.5 fold higher than pg-C 3 N 4 . The enhanced bactericidal performance is mainly ascribed to the Fe 3 O 4 involved cascade photo-Fenton reaction.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Rong Wo,Qiu-Lin Li,Chao Zhu,Yan Zhang,Ge-fei Qiao,Kai-yu Lei,Ping Du,Wei Jiang
In this work, a novel core@double-shell three-layer structure adsorbent (Fe3O4@SiO2@Zn–TDPAT) [TDPAT = 2,4,6-tris(3,5-dicarboxyl phenylamino)-1,3,5-triazine] was prepared to remove congo red (CR) and methylene blue (MB). The as-obtained magnetic adsorbent Fe3O4@SiO2@Zn–TDPAT was characterized by X-ray diffraction, Fourier transform infrared spectra, vibrating sample magnetometry, transmission electron microscopy, and scanning electron microscopy. The influencing adsorption parameters including adsorbent amounts, extraction time, pH, and ionic strength were investigated. Under the optimized conditions, the removal efficiencies of CR and MB reached 100 and 99%, respectively. The pseudo-second-order kinetic model and Langmuir model were suitable to illustrate the adsorption processes of CR and MB. The thermodynamic values, including Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°), showed that the adsorption processes were spontaneous and endothermic in nature. Moreover, the obtained nanocomposite remained stable in different acid–alkaline solutions and exhibited good reusability after multiple cycles. All of the experimental results indicated that Fe3O4@SiO2@Zn–TDPAT could be a potential adsorbent to purify dye wastewater.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Jing Zhou,Ning Gan,Tianhua Li,Hankun Zhou,Xing Li,Yuting Cao,Lihong Wang,Weiguo Sang,Futao Hu
An ultra-sensitive multiplexed signal amplified piezoelectric immunosensor for the detection of C-reactive protein (CRP) in serum was developed. Firstly, a sandwich-type immunoreaction was made between the capture probe [silicon dioxide-coated magnetic Fe 3 O 4 nanoparticles (MNPs) labeled with the primary CRP antibody (MNPs-CRP Ab1)], CRP (different concentrations), and signal tag [horseradish peroxidase (HRP) coupled with the HRP linked secondary CRP antibody co-immobilized on gold nanoparticles (AuNPs-HRP/HRP-CRP Ab2)]. The immunocomplex was subsequently exposed to 3-amino-9-ethylcarbazole (AEC) and hydrogen peroxide. MNPs-CRP Ab1 capture probe could not only improve the CRP enrichment to amplify the signal through magnetic separation, but also be readily immobilized on the electrode by an external magnet to prepare the sensor. The signal tag could immobilize vast HRP, which could catalyze and yield more AEC's insoluble oxidation product on piezoelectric crystal surface, also resulting in the amplified change in frequency response (Δ f = f − f 0 ). Thus the multiplex signal amplification was achieved. The Δ f was proportional to CRP concentration from 0.001 to 100 ng mL −1 with a low detection limit of 0.3 pg mL −1 . The optimum conditions were studied in detail. The proposed method could provide a fast, simple, and sensitive way for the clinical analysis of ultratrace CRP in heart diseases.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Qijia Zhang,Xiaodi Ma,Xiaoyu Du,Peng Song,Lixin Xia
We report a surface magnetic solid-phase extraction–surface-enhanced Raman scattering (SMSPE-SERS) method based on silver-nanoparticle-coated Fe 3 O 4 /chitosan (Fe 3 O 4 /CS@Ag) microspheres as the substrate, and this method integrates all steps from sample pretreatment to detection. Fe 3 O 4 /CS was synthesized by a one-step solvothermal method in which chitosan (CS) was used as a surface modifier and adsorbent. Fe 3 O 4 /CS@Ag microspheres exhibit both adsorption ability and SERS activity. Therefore, we used the SMSPE-SERS method to detect pesticide residues on fruit peel. The procedures of capturing, separating and enriching pesticides, as well as detection, are all integrated. In addition, the SERS substrate allows label-free detection of thiram pesticide in both fruit peel and apple juice. Owing to the uniform distribution of Ag NPs and the adsorption ability of CS, the thiram-detection sensitivity was sufficiently high to detect the lowest concentration of 1.2 ng/cm 2 , which was significantly lower than the maximum thiram residue limit (7 μg/cm 2 ) in fruits. The method was comparable to high-performance liquid chromatography with recovery ranging from 86.60 to 109.69 %.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-10
·
IF 5.3
Shan Xiangyu,Lu Juan,Li Chao,Wu Qian,Li Huiling,Yang Shuning,Guo Yanjia,Song Yujia,Li Ruidan,Tian Li
An efficient and innovative electrochemiluminescence (ECL) sensor was developed for trace detection of cyfluthrin. The sensor utilized materials such as lotus root shaped carbon fiber (Co CNFs), cadmium selenide quantum dots (CdSe QDs), and Fe 3 O 4 to amplify Ru(bpy) 3 2+ signals. Co CNFs, with its large specific surface area and porosity, served the purpose of not only enhancing the stability of the sensor by fixing CdSe QDs and Ru(bpy) 3 2+ on the Co CNFs/GCE, but also facilitating electron transfer. CdSe QDs was involved in the luminescence reaction and collaborated with Ru(bpy) 3 2+ to enhance the sensor's sensitivity, while Fe 3 O 4 promoted electron transfer in the system due to its large surface area. The solid-state ECL sensor achieved satisfactory signal under the synergistic action of these components. The ECL signal of the sensor was quenched by cyfluthrin, and a favorable linear relationship was observed between the sensor and cyfluthrin in the concentration range 1 × 10 –12 to 1 × 10 –6 M. The detection limit of the sensor was 3.3 × 10 –13 M (S/N = 3). The utilization of lotus root shaped carbon fiber, CdSe QDs, and Fe 3 O 4 in the Ru(bpy) 3 2+ system demonstrated a synergistic effect for cyfluthrin detection, presenting a new approach for the rapid determination analysis of pesticide residues in foods. Graphical
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高影响因子
TALANTA
·
2012
·
IF 3.794
Hong-mei Jiang,Zhong-peng Yan,Yue Zhao,Xin Hu,Hong-zhen Lian
A new protocol using zincon-immobilized silica-coated magnetic Fe 3 O 4 nanoparticles (Zincon–Si–MNPs) as solid-phase extraction (SPE) medium has been developed for the separation and preconcentration of trace lead in water. Various parameters such as pH, extraction time, concentration and volume of eluent, sample volume, and influence of co-existing ions have been investigated in order to establish the optimum conditions for the determination of lead in combination with graphite furnace atomic absorption spectrometry (GFAAS). The detection limit (LOD) of the proposed method for lead based on an enrichment factor of 200 was 10 ng L −1 . The relative standard deviations (RSDs, n = 5) were 8.3%, 7.8% and 9.2%, respectively, at 5, 0.5 and 0.05 ng mL −1 levels. This method has been successfully applied to the analysis of trace lead in natural and drinking water samples and the recoveries for the spiked samples were in the range of 84–104%.
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