SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guoli Xu,Meiling Du,Tao Li,Yueping Guan,Chen Guo
Nowadays, designing photocatalysts with high activity and recyclability for the degradation of pollutants is still a challenging problem. In this paper, a novel Fe 3 O 4 /BiVO 4 /CdS (FBC) heterojunction photocatalyst was firstly fabricated by simultaneously decorating CdS on the surface of pristine Fe 3 O 4 and BiVO 4 in a low-temperature water bath system. The FBC photocatalyst can enhance the absorption range of visible light and facilitate the separation and transfer of charges. Simultaneously, it can also provide large specific surface area and excellent magnetic response. FBC-3 displayed the highest degradation rate of tetracycline (87.37%) under visible light irradiation. Moreover, the important parameters affecting the photocatalytic activity were investigated to simulate the degradation of TC in real aqueous system. More importantly, the synthesized magnetic photocatalyst exhibited good universal applicability, stability and reusability. The Z-scheme transfer pathway for improving photocatalytic performance was also proposed based on the results of radical trapping experiments, electron spin resonance (ESR) measurement, optical and photoelectrochemical analysis.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 52
·46889-46899
·
IF 3.289
Xiaoxu Zhao,Ziyang Lu,Jinyan Kan,Chengwu Yi,Nailing Gao,Zhi Zhu,Minshan Song,Yongsheng Yan,Yang Wang,Tong Zhang
By using yeast as the carbon source, stable core–shell structured TiO2@Fe3O4 based on carbon (TiO2@Fe3O4-carbon) was obtained. The photocatalytic activity of TiO2@Fe3O4-carbon reached 82.6%, which was much higher than that of others; the enhanced photocatalytic activity originated from the good conductivity of carbon. Meanwhile, TiO2@Fe3O4-carbon also exhibited excellent stability during the photocatalytic reaction after 6 repeated cycles. In addition, a plausible mechanism was proposed and discussed on the basis of experimental results.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 107
·88492-88499
·
IF 3.84
Huimin Duan,Xiaojiao Wang,Yanhui Wang,Jianbo Li,Chuannan Luo
An ultrasensitive chemiluminescent biosensor with a high selectivity, based on a bioreceptor surface molecular imprinted polymer (SMIP) that used core–shell Fe3O4@SiO2–multi-walled carbon nanotube nanostructures (Fe3O4@SiO2/MWCNTs) as the backbone material, for bovine hemoglobin (BHb) determination was proposed. The Fe3O4@SiO2/MWCNTs were synthesized with a new method, and then were characterized using SEM, FTIR and XRD techniques. The adsorption ability of Fe3O4@SiO2/MWCNTs–SMIP was evaluated to be 91 mg g−1 following the Langmuir isotherm equation and it demonstrated an excellent recognition and adsorption ability for the imprinted sites located on the surface or near the surface of the Fe3O4@SiO2/MWCNTs. Under optimum conditions of CL, the detection range of BHb was from 5.0 × 10−10 to 7.0 × 10−7 mg mL−1 with a detection limit of 1.5 × 10−10 mg mL−1 (3δ). The proposed biosensor was successfully applied in the determination of BHb in real samples with high selectivity and sensitivity, and the recoveries were excellent and varied from 92% to 106%. Finally, the possible CL mechanism of the BHb in amplifying the CL signal of the luminol–NaOH–H2O2 system was discussed.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yang Liu,Zhuo Chen,Wenhan Xie,Shaokun Song,Yang Zhang,Lijie Dong
Biomass waste has emerged as a novel sustainable and renewable material for fabricating functional materials because of the lightweight and easy manufacturing. Herein, we synthesize a porous Fe3O4/carbon fiber (Fe3O4/CF) composites derived from bagasse waste by in-situ growth and a graphitization process. The Fe3O4 nanocrystals uniformly embedded in porous CF significantly construct the multiple interfaces and hierarchical microstructure of Fe3O4/CF composites. Fe3O4/CF composites exhibit a maximum reflection loss value of −48.2 dB at 15.6 GHz with a thin thickness of only 1.9 mm. Meanwhile, a broad effective absorption bandwidth of 5.1 GHz covering the frequency range of 12.9–18.0 GHz is achieved. The rough surface, porous structure, and proper component contribute to the improved impedance matching. Meanwhile, the Debye relaxation and interfacial polarization dominantly promote the attenuation ability of the microwave. The enhancement of attenuation ability and impedance matching together account for the superior microwave absorption performance.
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 8
·e5707
·
IF 3.14
Laiyun Zhou,Mingliang Wang,Kaixuan Wang,Tiantian Wen,Lanzhi Wang
Fe 3 O 4 @SiO 2 -CeCl 3 catalyzed chemoselective synthesis of functionalized 3-substituted-1,5-benzodiazepines via one-pot multicomponent and domino reactions has been developed. During the one-pot synthesis process, one new cycle and four new bonds (one C–C, two C–N and one C=C) were constructed by the nucleophilic addition and eliminate reaction (dehydration etc.) process, intramolecular proton transfer and cyclization process. The major advantages of the present method are good to excellent yields, shorter reaction time, simple experimental procedure, easy work up, mild reaction conditions, recyclability of the catalyst and ability to tolerate a variety of functional groups which gives economical as well as ecological rewards.
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DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Qiao Yan,Pingping Zhang,Menglin Wang,Ling Ma,Ke Wang,Kaoqi Lian
This study aimed to synthesize a novel magnetic covalent organic framework (COF)-based material and establish an efficient magnetic solid-phase extraction (MSPE) method for the determination of benzimidazoles (BZDs) in honey. Given the abundant nitrogen atoms in BZDs, the target material (Fe₃O₄@SiO₂@MPA-TAPT-COF) was designed with Fe₃O₄ as the magnetic core and a COF shell polymerized from 5-bromobenzene-1,3-dicarbaldehyde (MPA) and 4,4',4''-(1,3,5-triazine-2,4,6-triyl) trianiline (TAPT). The synthesized Fe₃O₄@SiO₂@MPA-TAPT-COF exhibited considerable specific surface area, good magnetic responsiveness, and excellent reusability. An MSPE method using Fe₃O₄@SiO₂@MPA-TAPT-COF as the adsorbent was developed for the purification of BZDs in honey, followed by quantification via ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS). This method featured simple operation, high sensitivity, and good efficiency. Under optimized MSPE conditions, It showed good linearity for 17 BZDs in the concentration range of 0.2–100 μg/L, with correlation coefficients (R²) ≥ 0.9991. The limits of detection (LODs) for BZDs in honey were as low as 0.009–0.342 μg/kg. For spiked honey samples, the recoveries of the 17 target BZDs ranged from 61.44 % to 118.90 %.These results confirm that Fe₃O₄@SiO₂@MPA-TAPT-COF is a promising adsorbent for sample pretreatment, and the developed method provides a reliable tool for the sensitive and efficient analysis of BZDs in honey.
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Qi Zhang,Liangyun Yu,Bairen Yang,Chenchen Xu,Wang Zhang,Qi Xu,Guowang Diao
Herein, Fe 3 O 4 @Ru-doped TiO 2 photocatalyst was developed successfully by a facile chemical strategy. The sample with 0.2% doping Ru showed the best photocatalytic activity, which could photodegrade 70.20% of methylene blue after 120 min of simulated sunlight exposure, and kept good degradation efficiency and recovery after 5 cycles. It could be attributed that the Ru-doping alleviated the band gap energy to make the electron-hole pairs easier to generate and enhanced the synergistic effect to increase the carrier separation efficiency. The present work provided a development prospect of simple preparation of recoverable photodegradation catalyst for environmental organic pollutants.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 19
·10561-10572
·
IF 2.936
Lu Fan,Min Deng,Caixue Lin,Chen Xu,Yana Liu,Zhennan Shi,Yingxi Wang,Zushun Xu,Ling Li,Man He
Fe3O4/MOF (metal organic framework)/L-cysteine was synthesized and applied for the removal of Cd(II) from wastewater. The adsorption kinetics and isotherms were investigated, and the results indicated that the adsorption obeyed the pseudo-second-order kinetic model and Langmuir isotherm. The maximum adsorption capacity was calculated to be 248.24 mg g−1. Fe3O4/MOF/L-cysteine was further applied to determine trace amounts of Cd(II) in real water samples using ICP-AES (inductively coupled plasma-atomic emission spectroscopy) based on magnetic solid-phase extraction (MSPE). The determination limit was 10.6 ng mL−1. Additionally, Fe3O4/MOF/L-cysteine can also be used as a fluorescent sensor for “turn-off” detection of Cd(II), and the detection limit was 0.94 ng mL−1.
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2020
·
IF 5.647
Zhu Mengting,Tonni Agustiono Kurniawan,You Yanping,Mohd Hafiz Dzarfan Othman,Ram Avtar,Dun Fu,Goh Hui Hwang
We aim at fabricating a ternary magnetic recyclable Bi 2 WO 6 /BiOI@Fe 3 O 4 composite that could be applied for photodegradation of tetracycline (TC) from synthetic wastewater. To identify any changes with respect to the composite's morphology and crystal structure properties, ΧRD , FTIR , FESEM-EDS, PL and VSM analyses are carried out. The effects of Fe 3 O 4 loading ratio on the Bi 2 WO 6 /BiOI for TC photodegradation are evaluated, while operational parameters such as pH, reaction time, TC concentration, and photocatalyst's dose are optimized. Removal mechanisms of the TC by the composite and its photodegradation pathways are elaborated. With respect to its performance, under the same optimized conditions (1 g/L of dose; 5 mg/L of TC; pH 7; 3 h of reaction time), the Bi 2 WO 6 /BiOI@5%Fe 3 O 4 composite has the highest TC removal (97%), as compared to the Bi 2 WO 6 (63%). After being saturated, the spent photocatalyst could be magnetically separated from solution for subsequent use. In spite of three consecutive cycles with 71% of efficiency, the spent composite still has reasonable photocatalytic activities for reuse. Overall, this suggests that the composite is a promising photocatalyst for TC removal from aqueous solutions.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Jinglu Chen,Mingtao Qiao,Wenyan Wang,Qiuyu Zhang
It is well known that palladium-catalyzed cross-coupling Suzuki reaction is very important way to build organic compound carbon skeleton. However, when some reactants such as chlorobenzene are used as substrates which has low reactivity, only moderately low yields were obtained using such kind of mobilized catalyst, Insufficient loading on the normal carrier, the problem of easy aggregation of palladium and large particle size of Pd were considered as reasons of it. A novel magnetic mesoporous Fe 3 O 4 @Void@mSiO 2 nanochains with yolk-shell structure have been first developed to solve the problems via magnetic-field induced distillation-precipitation polymerization together with a facile sol-gel method and the final calcination . Interestingly, we found that some pleated layers grown on the surface of Fe 3 O 4 @void@mSiO 2 nanochains during the hydrolysis of 3-aminopropyltriethoxysilane (KH-550) and special microstructures endow them with excellent porosity which are helpful for increasing the loading capacity of Pd nanoparticles . Owing to high aspect ratio and superparamagnetism , the magnetic nanochains can rotate in the water or organic solution and be separated and recycled easily with the drive of alternating magnetic field. In this catalysis system, the orderly mesoporous opening structure of the hollow mesoporous nanochains could effectively facilitate the transfer of reactant molecules, and the existence of the internal cavities would effectively prolong the action time of the Pd nanoparticles for the Suzuki reaction. The reaction yields of coupling reaction between bromobenzene/chlorobenzene and phenylboronic acid catalyzed by the nanochains can reach nearly 100% respectively. and the reaction yields can still maintain 92.93% and 60.86% after 7 cycles, respectively.
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DOI
TALANTA
·
2024
·
IF 5.6
Wenjing Yu,Jining Li,Guorong Huang,Zhe He,Huiyan Tian,Fengxin Xie,Weidong Jin,Qing Huang,Weiling Fu,Xiang Yang
Staphylococcus aureus ( S. aureus ) poses a serious threat to global public health, necessitating the establishment of rapid and simple tools for its accurate identification. Herein, we developed a terahertz (THz) metamaterial biosensor based on aptamer-functionalized Fe 3 O 4 @Au nanocomposites for quantitative S. aureus assays in different clinical samples. Fe 3 O 4 @Au@Cys@Apt has the dual advantages of magnetism and a high refractive index in the THz range and was used to rapidly separate and enrich target bacteria in a complex environmental solution. Furthermore, conjugation to the nanocomposites significantly increased the resonance frequency shift of the THz metamaterial after target loading. Our results showed that the shifts in the metamaterial resonance frequency were linearly related to S. aureus concentrations ranging from 1.0 × 10 3 to 1.0 × 10 7 CFU/mL, with a detection limit of 4.78 × 10 2 CFU/mL. The biosensor was further applied to S. aureus detection in spiked human urine and blood with satisfactory recoveries (82.4–109.6%). Our approach also demonstrated strong concordance with traditional plate counting (R 2 = 0.99306) while significantly lowering the analysis time from 24 h to <1 h. In conclusion, the proposed biosensor can not only perform culture-free and extraction-free detection of target bacteria but can also be easily extended to the determination of other pathogenic bacteria, rendering it suitable for various bacteria-related disease diagnoses.
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DOI
PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Tengteng Wang,Lian Xue,Chao Di,Peng Ma,Xiaojun Feng,Peng Chen,Wei Du,Bi-Feng Liu
Heparin, a widely studied glycosaminoglycan, plays crucial roles in the regulation of various physiological and pathological processes. Therefore, it's important to develop highly selective and sensitive methods for convenient monitoring of heparin levels in biological systems. We report the design and synthesis of Fe 3 O 4 @PDA@MnO 2 nanoparticles (FPM-NPs), which exhibit dual enzymatic activities, enabling quantitative detection of heparin. The FPM-NPs feature a unique tri-layer spherical shell structure, possessing both peroxidase-like and oxidase-like activities, and catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence or absence of H 2 O 2 . Remarkably, upon co-incubated with heparin, the oxidase activity of FPM-NPs decreases, while the peroxidase activity increases. By leveraging these dual enzymatic properties of FPM-NPs, a highly sensitive and specific colorimetric detection of heparin is achieved, with a detection limit reaching 6.51 nM and a good linear response to quantify heparin ranging 10–800 nM. Additionally, the developed FPM-NPs are successfully applied to measure heparin in fetal bovine serum samples. We also extend this detection method to a paper-based chip, enabling portable detection of heparin through grayscale analysis of mobile phone photographs. The multi-nanozyme-based heparin detection approach provides a new perspective for future research on expanding the application of nanocomposite materials in biomedical detection and analysis.
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产品关联
DOI
PubMed
高影响因子
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