APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Hong-Yan Zhang,Chao Yang,Qiang Geng,Hui-Ling Fan,Bao-Jun Wang,Meng-Meng Wu,Zhen Tian
A series of amine modified MOF-199 adsorbents were prepared by impregnation method for using H 2 S room temperature removal. The parent and functionalized materials were characterized by XRD , FT-IR, SEM, N 2 adsorption/desorption isotherms, and XPS . It was indicated that the structure of MOF-199 can be maintained after modification by appropriate tertiary amine triethanolamine (TEA), while primary amine monoethanolamine (MEA) and secondary amine diethanolamine (DEA) modification can destroy its structure due to the strong interaction with MOF-199. Breakthrough results showed that MOF-199 functionalized by TEA presented an improved H 2 S adsorption capacity of 2.74 mmol/g, higher than that of parent MOF-199 (1.67 mmol/g). Whereas, grafting of MEA and DEA into MOF-199 led to the sulfur capacity decrease to 0.83 mmol/g and 0.58 mmol/g, respectively. Calculation by density functional theory revealed that the binding energies of H 2 S adsorption on the TEA/MOF-199 were larger than that on bare MOF-199, which was considered to contribute to the improved adsorption. The enhanced binding energy of H 2 S on the TEA/MOF-199 was attributed to the hydroxyl in TEA.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wen Zhang,An Bu,Qingyuan Ji,Luofu Min,Song Zhao,Yuxin Wang,Jing Chen
We report a class of pKa-directed, precise incorporation of phosphonate ligands into a zirconium-based metal–organic framework (Zr-MOF), MOF-808, via ligand exchange. By replacing of formate ligands with methylphosphonic acid (MPA), ethanephosphonic acid (EPA), and vinylphosphonic acid (VPA), whose pKa values are slightly higher than that of the benzenetricarboxylic acid (BTC) linker in MOF-808, daughter MOFs can be synthesized without controlling the stoichiometric amounts of added MPA. The methylphosphonate MOFs (808-MPAs) demonstrate high porosities, with only small changes in the pore diameter and specific surface area when compared with the parent MOF-808. PXRD patterns and structure refinements indicate the expansion of the lattice for all MOFs after decorating with methylphosphonate ligands. The XPS spectra reveal a charge redistribution of the Zr6 node after ligand exchange. FTIR and 31P MAS NMR spectra, combined with DFT calculation, suggest that the methylphosphonate ligand is connected to the Zr6 node as CH3P(O)(OZr)(OH) species with an accessible acidic P–OH group. Besides, 808-MPAs demonstrate excellent chemical stability in concentrated HCl, concentrated HNO3, hot water, and 0.2 mol/L trifluoroacetic acid solutions. Impressively, 808-MPAs show ultrafast adsorption performance for uranyl ions using the ion-exchange property of P–OH sites in their cavity environment, with an equilibrium time of 10 min, much quicker than the previous adsorbents. The present study demonstrates a series of important proof-of-concept examples of the pKa-directed Zr-MOFs with tunable phosphonate-terminated ligands, which can extend to other phosphonate-functionalized Zr-based framework platforms in the near future.
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ANALYTICA CHIMICA ACTA
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2018
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IF 5.123
Yuanyuan Li,Xue Hu,Xiaodan Zhang,Haiyan Cao,Yuming Huang
Contrary to organic solvent-induced aggregation of Au nanoclusters (AuNCs), herein, we reported aggregation induced emission enhancement (AIEE) of AuNCs in an aqueous media through confinement of AuNCs by in situ formed Zn-MOF for detecting Zn 2+ . Glutathione capped AuNCs (GSH-AuNCs) was synthesized through reduction of Au 3+ by glutathione. Zn 2+ could significantly enhance the fluorescence of GSH-AuNCs upon addition of 2-methylimidazole, which was attributed to the formation of Zn-MOF. XRD and TEM were used to characterize the in situ formed Zn-MOF. Zn 2+ induced aggregation was demonstrated by dynamic light scattering and TEM. The quantum yields (QYs) of AuNCs after aggregation induced by in situ formed Zn-MOF attained to 36.6%, which was nearly 9 times that of the sole AuNCs. On this basis, a fluorogenic sensor was reported for Zn 2+ detection with a linear range from 12.3 nM to 24.6 μM and a detection limit of 6 nM (S/N = 3). The proposed sensor was successfully applied to assay the content of zinc in human serum, milk, water, and zinc sulfate syrup oral solution samples. The novel strategy proposed in this work may open a new window of interest in an unconventional application of gold nanoclusters/MOF nanoscale platform for metal ion detection and nutritional assessment of food.
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Nanomaterials
·
2018
·Vol. 8
·期 8
·600
·
IF 3.504
Lina Huang,Shaolong Huang,Ziyu Yang,Ailun Zhao,Chengxiang Liu,Jianguo Lu,Shuangchen Ruan,Yu-jia Zeng
ZnO/Ni3ZnC0.7/x% CNT (x = 0, 2, 5, 10) urchin-like structures have been synthesized using a facile method based on metal-organic frameworks (MOFs) and applied as the electromagnetic absorber. The results of the experiments demonstrate that the content of multi-wall carbon nanotubes (MWCNT) has a great influence on the absorbing performance of the hybrid material. Conduction loss, interfacial polarization and ferromagnetic resonance all contribute to the electromagnetic absorption. The urchin-like ZnO/Ni3ZnC0.7/5% CNT composite presents excellent absorbing properties. When the filler loading of ZnO/Ni3ZnC0.7/5% CNT composite in paraffin matrix is only 10 wt.%, a minimum reflection loss of −33.2 dB is achieved at a layer thickness of 4.9 mm.Keywords:MOF;electromagnetic absorbing properties;CNT;ZnO
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JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Shujuan Yang,Qinfeng Zou,Tianhao Wang,Liping Zhang
Cellulose acetate (CA) has been used to prepare ultrafiltration membranes because of its excellent properties, especially its biodegradability. To enhance the performance of the CA membrane, the excellent CA ultrafiltration membrane was synthesized by blending with graphene oxide (GO) and HKUST-1 (a metal–organic framework) @GO through the typical phase inversion process. The effects of the different fillers (GO and HKUST-1@GO) on the membrane properties were investigated. Firstly, the fabricated nanocomposites were analyzed through X-ray diffraction, Fourier transform infrared spectroscopy , and scanning electron microscopy. Then, the action of the fillers on the membrane morphology, permeability, separation performance, and antifouling properties were studied. Compared with CA/GO membranes, the CA/MOF@GO membranes exhibit higher hydrophilicity and pure water flux. This is because HKUST-1 can fully exploit the structure advantages of GO and prevent the stacking of GO layers, introducing unique properties to the HKUST-1@GO composite. The CA/MOF@GO 0.12 membrane has the highest water permeate flux of 183.51 L m −2 h −1 and also exhibits better antifouling performance than the CA membrane, which possesses a flux recovery ratio of 88.13% and a total fouling ratio of 40.32%. Hence, HKUST-1@GO shows potential as a filler in ultrafiltration membranes to improve their performance for water purification applications.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Xiaokang Liu,Mengyao Hu,Minghua Wang,Yingpan Song,Nan Zhou,Linghao He,Zhihong Zhang
Owning to the misuse of the antibiotics in animal husbandry and agriculture, it is highly urgent to determine the quantification of antibiotics in biological systems by the simple, sensitive, and fast method. In this work, a novel nanoarchitecture of Co-based metal-organic frameworks (Co-MOF) and terephthalonitrile-based covalent organic framework (TPN-COF) was synthesized (represented by [email protected] ), followed by the exploitation as the bioplatform of non-label aptasensor for detecting the most frequently used β-lactam antibiotics, ampicillin (AMP). The new porous hybrid material of [email protected] was synthesized by adding the as-prepared TPN-COF into the Co-MOF preparation system. The multilayered [email protected] nanosheets exhibit a high specific surface area (52.64 m 2 g −1 ), nitrogen-rich groups and excellent electrochemical activity. As a result, large amounts of aptamer strands can be bound over the [email protected] nanosheets owning to the strong π–π stacking and hydrogen bonds . When detecting AMP by the electrochemical impedance spectroscopy , the fabricated [email protected] aptasensor exhibits an ultra-low detection limit of 0.217 fg mL −1 within the AMP concentration from 1.0 fg mL −1 to 2.0 ng mL −1 , which was superior to those previously reported in literatures. In addition, this proposed aptasensor also shows high selectivity , good reproducibility and stability, acceptable regenerability, and favorable applicability in human serum, river water and milk. Therefore, the proposed [email protected] aptasensor has a great promise to be applied as a powerful tool in the fields of food safety.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Suhang Xun,Yan Xu,Jingjing He,Deli Jiang,Rong Yang,Di Li,Min Chen
Developing highly efficient and earth-abundant electrocatalysts for water oxidation is highly desirable for sustainable energy conversion applications. In this work, we designed and constructed a novel integrated ternary hybrid composed of CoO/Co 3 O 4 (CoO x ) nanoparticles supported on CoMoO 4 nanorods (CoO x /CoMoO 4 ) through a hydrothermal treatment of ZIF-67/CoMoO 4 followed by a thermal annealing. Benefiting from the enlarged surface areas, more active sites and fast charge transfer kinetics resulted from the interface between CoO x and CMO, the CoO x /CMO electrocatalyst manifests the excellent oxygen evolution reaction (OER) catalytic performance with a low overpotential of 253 mV at the current density of 10 mA cm −2 and high long-term durability, which is superior to those of most previously reported Co- or Mo-based oxides electrocatalysts. This work not only provides a highly efficient catalyst for OER but also sheds light on the fabrication of ternary Co-based hybrid electrocatalyst by using ZIF-67 as a precursor.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Yuanshuai Li,Yuting Wang,Liyan He,Lezu Meng,Haijun Lu,Xiaoli Li
In this work, a novel poly(4-vinylpyridine)-functionalized magnetic Al-MOF (Al-MOF-Fe 3 O 4 @P4VP) was synthesized successfully as an adsorbent for the adsorption of naproxen from aqueous solution. The resulting adsorbent was characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, vibrating sample magnetometer (VSM), BET surface area and X-ray photoelectron spectroscopy (XPS). Al-MOF-Fe 3 O 4 @P4VP had high surface area (123.68 m 2 /g), porous structure, rough surface and magnetic property. The maximum adsorption capacity of Al-MOF-Fe 3 O 4 @P4VP for naproxen could reach up to 31.67 mg/g and the adsorption process was well described by the Freundlich isotherm. The adsorption rate of naproxen on Al-MOF-Fe 3 O 4 @P4VP was very fast and the kinetics could be well modeled by the pseudo-second-order model. The adsorbent exhibited good adsorption ability even after ten adsorption-desorption cycles. Al-MOF-Fe 3 O 4 @P4VP had the characteristics of high removal efficiency, fast adsorption speed, good reusability and easy separation, making it a novel environment-friendly and effective magnetic nanomaterial in adsorbing naproxen from wastewater.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
·
IF 2.291
Xiaoqin Wang,Nana Yang,Qiaoqin Li,Fan He,Yufei Yang,Bohua Wu,Jia Chu,Anning Zhou,Shanxin Xiong
In view of the poor electronic conductivity and inferior structural stability, the direct application of Metal-Organic Frameworks (MOFs) as an electrode material is limited. Herein, the carboxylated multi-wall carbon nanotubes (MWCNT) are utilized as a substrate for the in-situ growth of bimetallic NiCo-based MOFs (NiCo-MOF). The flower-string-like NiCo-MOF/MWCNT composites are successfully synthesized using 4, 4′-biphenyldicarboxylic acid (BPDC) as a ligand via a simple solvothermal approach. In the composites, MWCNT is wrapped with 2D NiCo-MOF nanosheets through some bonds or affinity between MWCNT and NiCo-MOF. Meanwhile, the MWCNT presence does not affect the formation of the NiCo-MOF crystals. Compared with the hydrangea-like NiCo-MOF microspheres , the flower-string-like composite structures are more loosely assembled by NiCo-MOF nanosheets. Owing to the guiding effect of MWCNT on the NiCo-MOF growth, many well-dispersed flower-string-like structures can be achieved by adjusting MWCNT dosages. Due to the unique hierarchical structure and good synergistic effect, the NiCo-MOF/MWCNT composites exhibit excellent capacitance performances. The optimal composites demonstrate a large specific capacitance of 1010 F g −1 at 0.5 A g −1 , a good rate capability (760 F g −1 even at 10 A g −1 ), a good cycling stability and reversibility with the capacitance retention of 828 F g −1 (100% of the initial capacitance) and coulombic efficiency of approximate 98% at 5 A g −1 after 3000 cycles, a low internal resistance and charge transfer resistance. The asymmetric supercapacitor assembled by NiCo-MOF/MWCNT composites as electrode materials has high energy density even at high power density, good rate capability, excellent cycling stability and reversibility. Hence, the as-synthesized NiCo-MOF/MWCNT composites are a promising high-performance electrode material for supercapacitors .
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Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 42
·8330-8336
·
IF 4.543
Jing Han,Mengfei Zhang,Guojun Chen,Yongqing Zhang,Qing Wei,Ying Zhuo,Gang Xie,Ruo Yuan,Sanping Chen
Here a new type of ferrocene confined in a metal–organic framework (Fc-Zn-MOF) as an electrochemical signal tag has been synthesized and applied in an immunosensor for highly sensitive amyloid-β (Aβ, as a model protein) detection. In the present work, an electrochemically active molecule of Fc was covalently bonded in a Zn-MOF via postsynthetic modification to obtain a flower-like Fc-Zn-MOF, in which the high-content Fc signal units were periodically arranged in a well-defined porous structure, showing enhanced electrochemical activity. As noticed, Fc molecules are chemically anchored on the Zn-MOF, which avoids leakage of signal molecules, protects those electrochemical activities from potential damage and exhibits good stability. The Fc-Zn-MOF signal tag was further explored in constructing an electrochemical immunosensor for Aβ detection, with a linear range from 0.0001 to 100 ng mL−1 and a detection limit of 0.03 pg mL−1, showing improved analytical performance. This work presents an example of an Fc-MOF as a signal tag for Aβ detection, which would encourage atypical research lines for MOFs in bioassays where the introduction of ordered structures promises new opportunities.
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DYES AND PIGMENTS
·
2024
·
IF 4.1
Yi Zheng,Hanyu Yang,Qiang Yang,Yingying Li,Pran Gopal Karmaker,Xiupei Yang
Antibiotics play an important role in human life, but the abuse of antibiotics not only damages people's health but also poses a potential threat to the environment. Hence, the development of a rapid and efficient antibiotic detection method has profound significance. Herein, a novel terbium-based metal-organic framework (Tb-MOF) [Tb 2 (0.5BPDC) 4 (BPDC)(DMF) 2 .DMF] was prepared by a one-step solvothermal method . The framework structure of the synthesized Tb-MOF remained stable not only under different acidic and alkaline environments but also under different organic reagents. In view of the quenching effect of cefixime (CFX) on the fluorescence of Tb-MOF, a method for the detection of CFX was constructed with a linear range of 0.1–150 μM and a detection limit of 31.55 nM. The quenching mechanism was revealed by ultraviolet–visible absorption spectroscopy (UV–vis), fluorescence lifetime and density functional theory (DFT) to be attributed to the internal filtration effect (IFE) and photoinduced electron transfer (PET). Tb-MOF was applied to the quantitative analysis of CFX in environmental water samples and tablets, and the recovery rate was 98.4%–104.8%, which verified its practicability. Therefore, the prepared Tb-MOF is a potential fluorescence sensing platform for rapid and sensitive detection of CFX in actual samples.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhe Zhang,Juping Wang,Maria Serdechnova,Valeryia Kasneryk,Zheng Zhang,Carsten Blawert,Hao Wang,Mikhail L. Zheludkevich,Fei Chen,You Zhang
A novel inhibitor-loaded bilayer hybrid system based on the LDH inner layer and MOF outer layer is designed on an aluminum alloy 2A12 surface to improve corrosion performance. The hybrid film system covers the inherent cavities and intercrystalline defects of the LDH film using the affinity between the LDH and the MOF compounds. The results demonstrate that the LDH-inhI precursor film is entirely covered by new Zn-based MOF microrods. The LDH-inhI precursor film is partially dissolved and recrystallized in favor of MOF crystal growth to strengthen the binding adhesion between LDH and MOF films. The LDH-inhI/MOF-inhII bilayer film shows significantly enhanced corrosion resistance through the synergistic action of LDH and MOF nanocontainers doped with different corrosion inhibitors (vanadates, 2,5-furandicarboxylic acid, and benzotriazoles). Due to the multiple loadings of the MOF film and the sustained-release of the LDH film, this method provides an effective approach to developing new anticorrosion systems and enhancing both the barrier ability and active corrosion protection performance of LDH-based conversion treatments.
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