Crystals
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2018
·Vol. 8
·期 6
·250
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IF 2.144
Xue-Qing Zhan,Xiao-Yan Yu,Fang-Chang Tsai,Ning Ma,Huan-Li Liu,Yu Han,Lei Xie,Tao Jiang,Dean Shi,Yan Xiong
Owing to their high surface area and porosity, metal-organic frameworks (MOFs) have been gradually employed for a myriad of applications ranging from sensing, pollutant adsorption, and drug delivery to environmental remediation and catalysis. Magnetic nanoparticles-metal-organic frameworks (MMOFs) hybrid materials can facilitate facile removal of MOFs from solutions. In this report, we report the synthesis of Fe3O4@UiO-66 by encapsulation and simulated the drug loading and release by studying the adsorption and release of AO7. Thus, we loaded these MMOFs with AO7 and found that they were able to trigger and control its release by simply applying an external magnetic field. The magnetic field heats the magnets in the MOF, which causes the load to burst from the framework.Keywords:magnetic MOFs;triggered release;targeted delivery;AO7
研究领域:
环境科学
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材料科学
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药物递送
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Lili Xu,Xinyue Geng,Rui Cao,Jiahao Zhu,Fei Chen,Cuihong Li,Lexuan Wang,Xuekun Wang,Hongbo Suo
Metal-organic frameworks (MOFs) have shown great potential as supports for enzyme immobilization, but their application is limited by separation difficulties due to their nanoscale size. Herein, magnetic MOFs (Fe 3 O 4 @MIL-53-NH 2 (Al)) were prepared under mild conditions, and an ionic liquid (IL) was used as linker to covalently immobilize lipase in Fe 3 O 4 @MIL-53-NH 2 -IL/PPL. The IL was composed of imidazolium cations and bis(trifluoromethylsulfonyl)imide anions, which enhanced the hydrophobicity of the support. The synthesized biocatalyst Fe 3 O 4 @MIL-53-NH 2 -IL/PPL showed excellent activity, 2.4 times higher than free lipase, and its denaturation, thermal, and storage stability were all satisfactory. The activity of the biocatalyst remained at up to 88.4% after ten recycles. The excellent magnetic responsiveness facilitated the collection of the biocatalyst, which may be beneficial to its reusability, and the multiple interactions between lipase and support may enhance the structural stability of lipase, which was investigated by circular dichroism spectroscopy. Compared to free lipase, both the substrate affinity and catalytic efficiency of Fe 3 O 4 @MIL-53-NH 2 -IL/PPL were improved. The magnetic MOF composite materials prepared through the post-synthesis method exhibited good potential in the field of lipase immobilization. The preparation method of immobilized lipase in this work provides a meaningful reference for the application of other MOF composites in the field of enzyme immobilization.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Zhennan Shi,Chen Xu,Han Guan,Ling Li,Lu Fan,Yingxi Wang,Li Liu,Qingtao Meng,Run Zhang
We designed and synthesized a magnetic metal organic frameworks (MOFs) composite, Cu-MOFs/Fe 3 O 4 as the adsorbent for removal of lead (Pb(II)) and malachite green (MG) in wastewater. This Cu-MOFs/Fe 3 O 4 can be easily prepared by in-situ growth of Cu-MOFs with doping Fe 3 O 4 nanoparticles . The prepared Cu-MOFs/Fe 3 O 4 composite was well characterized by SEM , XRD , and FTIR spectra. The adsorption experiments found that Cu-MOFs/Fe 3 O 4 can serve as adsorbent for removal of Pb(II) and MG simultaneously. The adsorption capacities were found to be 113.67 mg/g for MG and 219.00 mg/g for Pb 2+ , respectively, which are significantly higher than reported materials. Adsorption isotherm , kinetics and recyclability of Cu-MOFs/Fe 3 O 4 for removal of Pb(II) and MG were then studied. Adsorption of Pb(II) and MG exhibited Freundlich adsorption isotherm model, with the adsorption kinetics of available second-order kinetic. Physical adsorption for MG and chemical adsorption for Pb(II) were confirmed by Dubinin-Radushkevich (D-R) isothermal adsorption model. The adsorption of Pb(II) and MG in real water samples were then studied. The Fe 3 O 4 /Cu-MOFs was found to be recyclable for removal of Pb(II) and MG, can be explored as the potential adsorbent for waste water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Li Wang,Kang Wei,Yi Pan,Yang Wei,Zhengwu Wang,Lurong Xu,Yuanfeng Wang,Xinlin Wei
The hazardous effects of residues from organophosphorus pesticides (OPPs) on human health have prompted researchers to look for innovative adsorbents and detecting techniques. Herein, a simple and economical material Fe 3 O 4 @PCN-224 was effectively produced as a desirable adsorbent for OPPs residues adsorption by integrating magnetic polydopamine (PDA) with the zirconium-based metal-organic framework (PCN-224). Modification of magnetic cores with PCN-224 allowed a dramatic increase in surface area and porosity to enhance pesticide adsorption. Moreover, the adsorption mechanisms inferred that π-π interactions, covalent bonds, and hydrogen bonds may promote the beneficial adsorption of OPPs by Fe 3 O 4 @PCN-224. Finally, the Fe 3 O 4 @PCN-224-based HPLC method exhibited with low detection limits (0.014–0.051 μg/L), good precision (1.70 % – 3.49 %), wide linearity (1–100 μg/L, R 2 ≥ 0.9936), satisfactory recoveries (86.16 % – 106.45 %), and high enrichment factors (92–101), demonstrating its significant potential for efficient extraction, enrichment, and analysis of OPPs in complex matrix samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Chen Hou,Daozhen Cheng,Shengyang Zou,Junyi Gao,Jianzhi Wang,Yang Wang
Phenol is highly toxic and can cause damage to humans and the ecosystem even at low concentrations. Therefore, developing a rapid, sensitive and easy operated detection strategy still faces challenge. In this work, the covalent organic frameworks (COFs)-reinforced peroxidase-mimicking hybrid nanozyme was rationally designed by assembly COFs on magnetic Fe 3 O 4 @ZIF-8 nanozyme. The Fe 3 O 4 @ZIF-8 @COF hybrid nanozyme exhibited significant improved catalytic activity and can be developed as a rapid and sensitive phenol colorimetric sensor with ease operation. The core-shell structure and the crystallinity of the as-prepared hybrid nanozyme were characterized in detail by various analytical methods SEM, TEM , FT-IR, XRD and elemental mapping. The catalytic activity of Fe 3 O 4 @ZIF-8 @COF mimic enzyme was investigated in the presence of H 2 O 2 using 4-aminoantipyrine (4-AAP) as the substrate. The developed Fe 3 O 4 @ZIF-8 @COF hybrid nanozyme was applied to construct colorimetric sensor for phenol detection and the result presented high selectivity , excellent stability and good reusability with a wide linear range (6–350 μM), low detection limit (2 μM) and an advantageous response time (5 min). The designed catalyst makes the enhancement of peroxidase-like activity, which can be attributed to the unique core-shell structure with the inner catalytic site and the outer protection and enrichment COF shell. Therefore, this proposed colorimetric sensor with robust, stable and easy-recycled properties displayed excellent practical significance for the fast and sensitive detection of phenol in water environment.
研究领域:
环境科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Shanshan Zhang,Guizhen Liu,Sihai Lv,YingLi Zhu,Pingan Chen,Hui Luo,Xiangcheng Li,Fu Chen
Magnetic carbon-based microwave absorption materials (MAMs) derived from metal-organic frameworks (MOFs) have been regarded as promising candidates for addressing the electromagnetic pollution. The construction of magnetic carbon-based MAMs derived from MOFs with ferromagnetic centers (Fe, Co, Ni etc.) and their composites has become a mainstream in recent years. However, MOFs with non-magnetic centers have received less attentions due to the challenges in achieving magnetic-dielectric synergistic effect and proper impedance matching in their derivatives. In this work, a facile metal-polyphenol network coating strategy has been proposed to facilitate the construction of magnetic MWCNTs decorated TiN 0.9 /NC absorber derived from non-magnetic MIL-125(Ti). The regulation effect of carbothermal temperature on magnetism, defect density, graphitization degree as well as electromagnetic parameters of absorbers have been systematically investigated. The obtained composites exhibit outstanding microwave absorption performance due to the magnetic-dielectric synergistic effect and improved impedance matching. The minimum reflection loss reaches −42.55 dB at 1.91 mm and the effective absorption bandwidth reaches as wide as 4.6 GHz with an ultra-thin thickness of only 1.38 mm. It is believed that this study provides a new way to construct efficient magnetic carbon-based MAMs with non-magnetic metal-based MOFs and a meaningful exploration for the preparation of ultra-thin absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
·
IF 8.5
Mingfei Pan,Xuan Liu,Jingming Sun,Dan Zhang,Yixin Wang,Xiaochun Hu,Shuo Wang
This study utilized computational simulation and surface molecular imprinting technology to develop a magnetic metal-organic framework molecularly imprinted polymer (Fe 3 O 4 @ZIF-8@SMIP) capable of selectively recognizing and detecting multiple fluoroquinolones (FQs). The Fe 3 O 4 @ZIF-8@SMIP material was synthesized using the “common” template-ofloxacin, identified by computational simulation, demonstrating notable adsorption capacity (88.61–212.93 mg g −1 ) and rapid mass-transfer features (equilibration time: 2–3 min) for all tested FQs, consistent with Langmuir adsorption model. Subsequently, this material was employed as a magnetic solid-phase-extraction adsorbent for adsorption and detection of multiple FQs by combining with high performance liquid chromatography. The developed method exhibited good linearity for various FQs within the concentration range of 0.1–500 μg L −1 , with low limit of detection (0.0605–0.1529 μg L −1 ) and limit of quantitation (0.2017–0.5097 μg L −1 ). Satisfactory recoveries (88.38–103.44%) were obtained when applied to spiked food samples, demonstrating the substantial potential of this Fe 3 O 4 @ZIF-8@SMIP material for rapid enrichment and identification for multiple FQs residues.
研究领域:
分析化学
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材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2020
·
IF 5.778
Guocheng Zhu,Yongning Bian,Andrew S. Hursthouse,Shengnan Xu,Nana Xiong,Peng Wan
Dissolved organic matter (DOM) is not only a vector for the migration of aquatic environmental pollutants, but is also key to the control of water pollution . Economic and effective DOM removal through coagulation is essential in water treatment processes. This work investigated the role of carboxylated magnetic metal organic frameworks (MMOFs) nanoparticles in polymeric iron-based coagulation for the removal of aquatic DOM using a MMOFs-doped polyferric iron-based coagulant (MMOF-PIC). Analytical methodologies and tools used in this research included scanning electron microscopy (SEM), zeta potential , molecular weight cut off (MWCO), vibrating sample magnetometer (VSM) measurement, excitation emission matrix spectroscopy (EEMs), and X-ray photoelectron spectroscopy (XPS). The results showed that MMOF-PIC had the potential to change the structure of the polyferric iron-based coagulant (PIC) and charge, as determined by a porous surface morphology, a higher medium polymeric species distribution, and a more positive zeta potential. The MMOFs consequently enhanced PIC action on the removal of UV254 exposed DOM species with molecular weight <30 kDa, including aromatic C C based compounds, org-N as primary amines and amide/peptide bound species, water containing microbial metabolites and protein-like materials. The coagulation of DOM was enhanced by improving charge neutralization, adsorption-bridging and sweep-flocculation in the presence of MMOFs nanoparticles. This was due to hydrogen bonds , π-π bonds and covalent bonds resulting from actions of nanoparticles and pollutants. These results indicate that magnetic MOF nanoparticles can improve PIC coagulation for DOM, enhancing future removal of target pollutants.
研究领域:
环境科学
·
材料科学
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水处理技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2021
·
IF 3.205
Guangyang Liu,Mingshuo Tian,Meng Lu,Weiye Shi,Lingyun Li,Yuhang Gao,Tengfei Li,Donghui Xu
Detection of low levels of triazole fungicides in agricultural product matrices is important. Although several detection methods have been developed, all have some drawbacks, such as being time-consuming, requiring complex sample pretreatment, and consuming large volumes of organic solvents. There is an urgent need for a simple and rapid detection method for triazole fungicides. In this study, the adsorbent composite material magnetic MOFs based on Fe 3 O 4 -MWCNT was synthesized by in-situ polymerization at room temperature, and was applied to extract triazole pesticides from fruits and vegetables. High-performance liquid chromatography-tandem mass spectrometry was used for quantification. Under optimized conditions, the constructed detection method showed a low detection (LOD) of 0.52–1.83 μg/L (S/N = 3) and wide linear range of 5.00–500.00 μg/L for triazole fungicides in the fruit and vegetable samples. The method recovery for spiked fungicides (10, 50, and 100 μg/L) in cabbage, spinach, orange juice, and apple juice ranged from 62.80% to 94.20%. The constructed detection method has a lower detection limit than previously reported methods and has a higher sensitivity for triazole pesticide residues in complex matrices.
研究领域:
分析化学
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环境科学
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农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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