Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·21029-21038
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IF 9.931
Liang Zhang,Jing Wang,Xinyi Ren,Wentao Zhang,Tianshu Zhang,Xinnan Liu,Ting Du,Tao Li,Jianlong Wang
The excessive accumulation of toxic copper species makes it imperative to develop smart dual-functional materials for the simultaneous removal and detection of Cu(II) in drinking water. In this work, novel core–shell NH2-MIL-101(Al)@ZIF-8 nanoflowers were successfully fabricated via an internal extended growth mode under the regulation of polyvinylpyrrolidone (PVP) to achieve this goal. Benefiting from the specific affinity of imidazole nitrogen in ZIF-8 toward Cu(II), the resultant NH2-MIL-101(Al)@ZIF-8 shows high adsorption capacity (526.74 mg g−1). Moreover, the fluorescence of NH2-MIL-101(Al) shows a Cu(II)-dependent change, causing this composite to possess superior selective/sensitive detection with a broad linear range (1.5–625 μM) and a low detection limit (0.17 μM) for Cu(II). Specifically, the hybrid MOF@MOF structure provides greater sensitivity as compared to the individual constituent (pristine NH2-MIL-101(Al)) and the mixed state, which is ascribed to the rational optimization of the smart adsorbent based on the following two aspects. (i) The synergistic effect of the core–shell nanostructure improves the preconcentration ability at the interface between single MOFs. (ii) The existence of the three-dimensional hierarchical nanoflower architecture (structure optimization) accelerates the mass transport and sculpts the final composite with enhanced adsorption and detection ability. These indicate that the smart NH2-MIL-101(Al)@ZIF-8 nanoflower could be an excellent candidate for the synchronous remediation and selective detection of Cu(II) in aqueous systems, which could be potentially useful in wastewater treatment and water quality monitoring.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Jia Wang,Yansong Liu,Xiuyan Guo,Hongqiang Qu,Ran Chang,Jing Ma
Metal–organic frameworks (MOFs) exhibit highly designable properties and have been used in wide applications. To further improve their performance, the modification of MOFs is an effective method. However, the modification process is usually complicated. Besides, the sustainable use of MOFs is difficult to achieve due to the complicated recycling treatment. Herein, we designed a polyethyleneimine (PEI)-modified NH2-MIL-101(Al) composite (PEI@NH2-MIL-101(Al)). This composite showed excellent dye removal performance of methyl orange (MO, 89.4%) and Direct Red 80 (DR80, 99.8%). Remarkably, the dye removal application of PEI@NH2-MIL-101(Al) also acted as a modification process toward flame retardant application. Thus, the dye-adsorbed PEI@NH2-MIL-101(Al) composite (MO-PEI@NH2-MIL-101(Al) and DR80-PEI@NH2-MIL-101(Al)) was sustainably used as an effective flame retardant for an epoxy resin (EP) at low additions (4.0 wt %). The limiting oxygen values of EP/MO-PEI@NH2-MIL-101(Al) and EP/DR80-PEI@NH2-MIL-101(Al) increased to 26.5 and 26.7%, respectively. The heat release and the smoke production of dyes-PEI@NH2-MIL-101(Al)/EP were greatly reduced compared with those of EP. This strategy provides a simple and effective modification method for MOFs. Meanwhile, the modified MOF composite can achieve sustainable application, giving full play to the advantages of MOFs.
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
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Junjie Qi,Jingkun Li,Yuqi Wan,Yu Li,Fuwei Pi
Antibiotic residues are becoming more and more concern due to the increasingly serious resistance from bacteria to organism. On-site and accurate evaluation on antibiotics is necessary and urgent to effectively solve such public issue. To provide point-of-care-test (POCT) ideas for antibiotic accurate evaluation, a fluorescence (FL)-surface-enhanced Raman scattering (SERS) dual-mode detection of tetracycline antibiotic (TCs) was realized for the first time. Based on the inner filter effect in Ag@NH 2 -MIL-101(Al) nanoprobe, the fluorescence quenching was induced and the SERS signal was swiftly turn on through π-π interaction and hydrogen bonding in the presence of TCs. This FL-SERS dual mode sensor displayed excellent detection limits (FL in ∼10 −3 ppm, SERS in ∼10 −5 ppm), and achieved a reliable detection of TCs in honey with a recovery rate of 84.45%−112.08%. This method combines the advantages of FL and SERS detection, meanwhile, two techniques verified against each other to achieve highly sensitive and specific FL-SERS dual-mode sensor for TCs. We believe that such antibody-or aptamer-independent FL and SERS complementary nanoprobe can be applied to fast, direct and multiple sensing in environment and food hazards.
研究领域:
分析化学
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环境科学
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食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Rui Zhao,Cheng Cheng,Xiurong Wu,Xueyan Bai,Fenghuan Wang
Due to the excellent pore structure , MOFs as the stationary phase was playing an important part in chromatography . In this work, the shell-core MIL-101(Al)@SiO 2 composites post-synthetic modified by ligands with different polarities were fabricated for separation of estrogens. The structure and morphology of these materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET). In order to investigate the influence of the ligand polarity on chromatographic separation performance of estrogens, alkyl molecules with different chain length were introduced as the ligands. With the hydrophobicity and chain length of the ligands increasing, the resolutions of the MIL-101(Al)@SiO 2 columns for the separation of estrogens exhibited the tendency of a parabola. Best result was achieved on the C4-MIL-101(Al)@SiO 2 column. On that basis, the possible retention mechanism on C4-MIL-101(Al)@SiO 2 column was elucidated by studying the mobile phase effect on separation behavior.
研究领域:
化学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 9
·1-6
·
IF 1.784
Zhao Tian,Dong Ming,Zhao Yi
[Fe(HB(pz) 3 ) 2 ], a well-studied spin-crossover (SCO) complex, has been entrapped in NH 2 -MIL-101(Al) metal–organic framework (MOF) via gas diffusion method. [Fe(HB(pz) 3 ) 2 ] would sublimate when temperature exceeds 100 °C, especially at low pressure. Thus, in the selected condition, [Fe(HB(pz) 3 ) 2 ] molecules can be sublimated to a gas phase and diffused into the pores of NH 2 -MIL-101(Al), which yield [Fe(HB(pz) 3 ) 2 ]@MIL-101 hybrid materials. The identity of composites, with a loading of iron complex at ~ 8 wt%, was characterized by X-ray diffraction and spectroscopic attestation. The hybrid materials demonstrate a gentle spin transition curve from 300 to 400 K, which is different from the SCO behavior of [Fe(HB(pz) 3 ) 2 ]. And for the pure [Fe(HB(pz) 3 ) 2 ] sample at 400 K, only 60% of Fe(II) is in HS, while in hybrid samples, HS state is complete. This interesting phenomenon might indicate that the spin transition in the hybrid sample can be triggered at lower temperature. The composite samples were thoroughly studied by X-ray diffraction, IR spectroscopy, atom absorption spectroscopy, nitrogen physisorption, and magnetic measurements. Thereby, a novel MOF-based material with isolated SCO units is proposed, which demonstrate a salient ‘matrix-effect’ on spin-crossover behavior of [Fe(HB(pz) 3 ) 2 ].
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
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
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiawei Huang,Haojie Dong,Lin An,Mingshan Zhu,Junhao Qin
Hydrogen peroxide (H 2 O 2 ) is a versatile substance with a wide array of applications, and piezocatalysis represents a promising alternative approach for its on-site synthesis. In this study, we report the successful synthesis of an aluminum-based metal-organic framework (MOF) NH 2 -MIL-101(Al), which exhibits exceptional piezocatalytic activity. The NH 2 -MIL-101(Al) catalyst demonstrated good piezoresponse to the external mechanical forces, with an estimated piezoelectric coefficient of 18.2 nm V −1 . Notably, the NH 2 -MIL-101(Al) piezocatalyst achieved a high H 2 O 2 production rate of 8.89 mmol g −1 h −1 under ultrasonic vibration, and demonstrated robust catalytic performance under complex environmental conditions. Mechanistic analysis revealed the promoted charge transfer as well as efficient O 2 reduction by the induced polarized electric field over NH 2 -MIL-101(Al). This research contributes significantly to the advancement of novel MOF materials tailored for H 2 O 2 production, underscoring the potential of MOFs in enhancing piezocatalytic processes.
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）