RSC Advances
·
2016
·Vol. 6
·期 54
·48884-48895
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IF 3.289
Haochi Liu,Ligang Chen,Jie Ding
As organic dyes are a major group of water pollutants, the development of materials for removal of dyes is of great significance for the environment. Here we report a kind of magnetic metal–organic framework (MOF) for the adsorption of different kinds of anionic and cationic dyes. Magnetic NH2-MIL-101(Al) was synthesized and characterized with Fourier-transform infrared spectrometry (FT-IR), physical property measurement system (PPMS), X-ray diffraction (XRD), a transmission electron microscope (TEM), a thermogravimetric analyzer (TGA) and nitrogen adsorption/desorption measurements. Adsorption isotherms and thermodynamic studies indicated that the maximum adsorption capacities of malachite green (MG) and indigo carmine (IC) were 274.4 and 135 mg g−1, respectively. The mechanisms of interaction such as electrostatic interaction, hydrogen bonding, π–π stacking interaction, and hydrophobic interaction are discussed for the adsorption of cationic and anionic dyes onto magnetic NH2-MIL-101(Al). Also, magnetic separation in this method shortened separation time, and the magnetic material can be reused at least five times without obvious decrease in the removal efficiency. Moreover, the synthesis of the magnetic NH2-MIL-101(Al) is easy to control and the good solvent stability makes this material promising as a novel adsorbent for the adsorption and removal of dyes from aqueous solution.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yan Gao,Miao Yan,Liangting Chen,Jianshe Zhao
High activity peroxophosphotungstates with different organic cations were encapsulated into the metal-organic framework modified by magnetic nanoparticle (Fe 2 O 3 /MIL-101) to prepare the magnetic supported catalysts, which were used to improve the diesel desulfurization efficiency. The desulfurization result shows that one selected catalyst, (BTA) 3 PW 4 @Fe 2 O 3 /MIL-101, possesses high catalytic activity in the oxidation of various organic sulfides with H 2 O 2 as green oxidant. The catalyst can be magnetically recycled and reused for ten consecutive cycles without significant decrease in activity. Based on the GC-MS and EPR results, it is confirmed that sulfides are oxidized to corresponding sulfones in the presence of •OH radical. In a word, the high activity, good stability and reusability of catalyst prepared in this work make it have a good prospect of industrial application.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 21
·11587-11595
·
IF 7.443
Lijin Huang,Man He,Beibei Chen,Bin Hu
A magnetic MOF composite was successfully prepared by a novel and green strategy through reasonable design. The nano Fe3O4@SiO2 core was first coated by a shell of Cu(OH)2 as the self-template, followed by a conversion of Cu(OH)2 into HKUST-1 at room temperature in a water–ethanol mixture solvent, and Fe3O4@SiO2@HKUST-1 core–shell nanostructures were obtained successfully. Based on this, a Bi-I-functionalized-magnetic HKUST-1 composite was prepared through a flexible coordination-based post-synthetic strategy. Powder X-ray diffraction spectrometry, N2 sorption–desorption isotherms and Fourier transform infrared spectroscopy were used for the characterization of the magnetic MOF composites. The core–shell morphology was confirmed by transmission electron microscope images and the result of thermogravimetric analysis showed that the magnetic composites had excellent thermal stability. Besides, the adsorption of Hg2+ on Fe3O4@SiO2, Fe3O4@SiO2@HKUST-1 and Bi-I-functionalized magnetic MOF composites was investigated, and a good adsorption selectivity of Bi-I-functionalized magnetic MOF composites towards Hg2+ was demonstrated, with high adsorption capacity (264 mg g−1) and fast adsorption dynamics. The Bi-I-functionalized magnetic HKUST-1 composite was then successfully employed for the selective removal of Hg2+ from water, demonstrating great potential application of the prepared magnetic MOF composite as a fascinating adsorbent in environmental monitoring.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Junsong Yue,Xiaochen Liu,Zhansheng Wu,Zhiyan Li,Jianwen Wang,Min Tu,Huaiqi Shi
To solve the problem that free glycosyltransferase is difficult to isolate and reuse in ginsenoside Rh2 catalysis and synthesis. In this study, we developed a magnetic nickel-based metal-organic framework (MOF) material (Fe 3 O 4/ PDA@MOF) to enable the separation of recombinant glycosyl transferase (UGT) directly from crude enzyme solutions, while simultaneously immobilizing it by utilizing the specific adsorption of Ni 2+ ions to His-tag. Our investigations demonstrated that the Fe 3 O 4 /PDA@MOF@UGT was successfully prepared, which not only maintained enzyme activity, but was reused by low-cost magnetic separation and exhibited enhanced enzyme loading and stability. Following thorough research and optimization, the immobilized enzyme achieved a rare ginsenoside Rh2 concentration of 69.68 µg/mL under optimal conditions, with an initial activity of 61.99 % after six cycles. This cost-effective, efficient, and sustainable biocomposite holds significant promise for industrial applications in enzyme purification and catalytic synthesis of ginsenoside.
研究领域:
生物化学
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药学
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合成生物学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2024
·
IF 6.1
Jiarong Guo,Ying Ma,Tongyu Han,Jiao Yang,Peng Miao
Metal–organic frameworks (MOFs) with fit ligands and metals can be integrated into electrochemical biosensors for the detection of various biomolecules. In this study, we have synthesized novel magnetic MOF composites as electrocatalysts and constructed a novel biosensor for electrochemical detection of dopamine. The composites named Fe3O4@ZIF-8@AuNPs–COOH are synthesized through layer-by-layer assembly. They exhibit excellent stability and cooperative catalytic activity. In addition, green recycling is readily achieved through magnetizing/demagnetizing the electrode. The large specific surface area and ordered porous structures of the magnetic MOFs ensure good dispersion of gold nanoparticles, while the carboxyl group efficiently shields other redox-active interfering substances. The proposed electrochemical biosensor accomplishes the sensitive detection of dopamine in human serums and living cells. This study broadens the application of MOFs in electrochemical biosensing, validates the feasibility of biosensors for in vivo analysis, and provides new insights into green sensing.
研究领域:
材料科学
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电化学
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生物传感器
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分析化学
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产品关联
DOI
PubMed
高影响因子
FOOD CONTROL
·
2023
·
IF 6
Yangjie Chen,Li Zheng,Juan Hao,Lijuan Huang,Qinghui Wang,Youting Zhou,Zhihang Yin,Lingpu Jia,Huiming Li,Wenlong Liao,Kunping Liu
In this study, a magnetic metal-organic frameworks (MOFs) based hybrid substrate was designed and fabricated for SERS detection of enrofloxacin (ENR) in milk. The magnetic MOF (Fe 3 O 4 @UiO-66-NH 2 ) was synthesized by a facile microwave-assisted method, then loaded with popcorn-like Au nanoparticles (NPs) through electrostatic interaction. The as-prepared SERS substrate (Fe 3 O 4 @UiO-66-NH 2 /Au NPs) integrated the abundant hot spots of popcorn-like Au NPs with porous Fe 3 O 4 @UiO-66-NH 2 , which greatly improved its SERS activity and stability. More importantly, benefiting from the fingerprint characteristics of SERS and adsorption performance of Fe 3 O 4 @UiO-66-NH 2 , the SERS substrate exhibited high selectivity and sensitivity in detecting ENR. Under the optimal detection condition, a good linearity (R 2 = 0.996) was obtained with ENR concentration of 1.0 × 10 −9 –1.0 × 10 −6 M in spiked milk, the LOD was as low as 5.26 × 10 −10 M, and the recoveries were in the range of 76.1–86.1 % at three different spiking levels. The whole detection process including sample pretreatment took about 50 min, which indicating that the prepared substrate has great potential in sensitive and real-time detection of ENR in milk.
研究领域:
分析化学
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材料科学
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纳米技术
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食品安全
✓ 已验证
产品关联
DOI
高影响因子
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