Materials Today Chemistry
·
2023
·
IF 7.3
Mao Guo,Siyang Dong,Jing Xiong,Xuanyang Jin,Pengfei Wan,Shengjun Lu,Yufei Zhang,Jian Xu,Haosen Fan
Flexible core-shell polyacrylonitrile (PAN)/carbon nanotubes (CNTs)@Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/Uio-66-NH 2 (PC@PU) hybrid nanofiber membrane was prepared by coaxial electrospinning technology. PAN polymer and CNTs particles were used as core to improve the membrane structure stability for further ensuring the thermal stability of the separator. PVDF-HFP and Uio-66-NH 2 nanoparticles were applied to reinforce the affinity of separator to electrolyte. The PC@PU composite membrane delivered high thermal stability and fantastic electrolyte affinity (545.76%). Furthermore, compared with Celgard 2325 commercial membrane, the PC@PU composite membrane exhibited higher porosity (80.22%) and higher Li + conductivity (3.43 mS/cm), leading to superior rate performance and long-term cycle stability. The cell with the PC@PU hybrid membrane displayed high specific capacity of 143 mAh/g at 1C and only 0.0259% capacity attenuation of each cycle after 1000 cycles. In addition, the PC@PU composite membrane demonstrated remarkable flexibility, and the cells with bent separators exhibited outstanding electrochemical performance. Hence, the PC@PU hybrid nanofiber membrane can pave a way for the further application in the field of secondary batteries separator.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 15
·23480-23492
·
IF 4.672
Lingxin Meng,Zhenguo Zhang,Mengchi Ju,Jingmei Xu,Zhe Wang
Summary Organic-inorganic modification by incorporating metal-organic frameworks to copolymers is one strategy to advance the properties of membranes. Here, the imidazole-loaded MIL-101-NH 2 (Im@MIL-101-NH 2 ) was prepared and chemically anchored onto sulfonated poly (arylene ether ketone sulfone) containing carboxyl groups (C-SPAEKS). The chemical stabilities, mechanical properties, and dimensional stabilities of compound membranes were increased. The highest tensile strength of C-SPAEKS-IM6 reach to 105.36 MPa. The weight retention rate of hybrid membranes was still higher than 90% after the oxidation stability test at 80°C. Furthermore, the introducing Im@MIL-101-NH 2 could construct new proton transport paths, and the amphiphilic imidazole molecules embedded inside Im@MIL-101-NH 2 could act as proton carriers. The C-SPAEKS-IM6 showed a maximum proton conductivity of 0.082 S cm −1 at 90°C. Additionally, the peak power density of C-SPAEKS-IM6 was 171.52 mW cm −2 . To sum up, this series of membranes have latent capacity in the application of fuel cells. Im@MIL-101-NH 2 was anchored on polymer backbones via the Hinsberg reaction. Chemical bonds between MOFs and polymer chains improved compatibility of two phases. Cross-linking structure enhanced the mechanical property and oxidative stability. The sulfonamide groups could devote protons and transport it to MOFs.
研究领域:
材料科学
·
化学
·
能源工程
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-8
·
IF 5.479
Liang Yutao,He Juan,Huang Zhipeng,Li Huayu,Zhang Yunxia,Wang Huige,Rui Chaofan,Li Yuanyuan,You Liqin,Li Kai,Zhang Shusheng
A surface imprinted polymer of type UiO-66-NH2@MIP was prepared by combining molecular imprinted polymers (MIPs) and an amino-functionalized zirconium-based metal-organic framework. Quercetin is used as the virtual template, UiO-66-NH 2 acts as the carrier to which the monomer acrylamide can be copolymerized. The material was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. It was used as a sorbent in a solid-phase extraction column. The extraction conditions were optimized. The adsorption capacities for aflatoxins AFB1, AFB2, AFG1 and AFG2 by this SPE and by the commercial SPE were compared. The method was successfully applied to quantify the aflatoxins in grain. Figures of merit include (a) good linearity (range from 0.20–45 μg·kg −1 ) with R 2 (range from 0.9986–0.9994), (b) low detection limits (90–130 ng·kg −1 ), (c) acceptable reproducibility (1.0–5.9%; for n = 6), and (d) relatively satisfactory recovery rates (74.3–98.6%). The new sorbent has good selectivity and reusability.
UiO-66-NH 2 @MIPs were synthesized with modified UIO-66-NH 2 as core and quercetin as pseudo template. A cartridge was prepared with the polymers as the sorbent, and its performance was compared with different commercial SPE cartridges.
研究领域:
分析化学
·
食品科学
·
材料科学
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高影响因子
POLYMER
·
2025
·
IF 4.5
Xuelian Liu,Qian Li,Yuying Zheng,Weijie Zheng
Antistatic nylon-6 (PA6) composites have attracted considerable attention due to their tailored properties for electronics, textiles, and automotive applications. In this paper, the antistatic PA6 composites comprising with polypropylene (PP), aminated multi-walled carbon nanotubes (MWCNTs-NH 2 ) and aminated carbon black (CB–NH 2 ) were prepared by melt blending and compression molding. In the composite system, PP was used as the co-matrix to assist the phase separation of PA6. MWCNTs-NH 2 and CB-NH 2 were introduced as conductive fillers. All composites showed good thermal stability with the T 5 % higher than 376 °C and the composites containing fillers showed higher residues after thermal degradation due to the good thermal stability of MWCNTs-NH 2 and CB-NH 2 . The DSC and XRD results indicated that the crystallization properties of the composite materials were determined by PA6 and PP rather the conductive fillers. In general, the introduction of conductive fillers decreased the mechanical properties but effectively improved the conductivity of the composites and then the antistatic properties. Besides, the antistatic analysis and mechanical test denoted that MWCNTs-NH 2 and CB-NH 2 showed synergistic effect on improving the antistatic and mechanical properties of the composites, which was more evident at high MWCNTs-NH 2 quantity. The micromorphologies obtained by SEM first confirmed the ductile fracture of these composites, and then disclosed a two-phase structure of PA6 and PP polymer matrix, where the conductive fillers were found in the PA6 phase. Considering both mechanical and antistatic properties, the composite (PCNB-3) containing both 3 phr MWCNTs-NH 2 and CB-NH 2 was proposed for the antistatic PA6 composite.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamei Ma,Wei Zhong,Langlang You,Yi Pei,Chunxin Lu,Zhiyin Xiao,Zhongquan Shen,Xiujuan Jiang,Nianlong Qian,Xiaoming Liu,Shuhua Zhang
In this work, three materials of Cu-Cu 2 O/rGO-NH 2 -4.4/1, -1/1 and -1/10.4, in which the numeric suffices denote the ratio of Cu/Cu 2 O in the materials, were described and characterized using various analytical techniques including FTIR, XRD, SEM, HRTEM, XPS and Raman spectroscopy. To probe the band structures of these materials, UPS, cyclic voltammetry, and UV–vis reflection spectroscopy were also employed. The formation of heterojunctions in the ternary materials tune their band structures by raising the energy level of valence band maximums (VBMs), inducing an internal electric field (IEF) and an electron accumulation layer (EAL) within the materials. Augment of copper content in the materials can enhance the energy level rising. The coordination of N-methylimidazole (NMI) with Cu 2 O of the materials can also contribute to raising the energy level. The changes in these electronic properties bring about a synergistic effect in selective aerobic oxidation of benzylic alcohols via improving O 2 activation and facilitation of electron transfer between the catalyst and the reactants due to the rising of the energy level of VBM and the formation of IEF.
研究领域:
材料科学
·
催化
·
电化学
·
表面科学
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DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Sumei Li,Fan Feng,Sha Chen,Xiaolei Zhang,Yixuan Liang,Saisai Shan
MOFs are usually used as efficient adsorbents to remove specific pollutants in water. However, because of their poor water stability relatively small particle size, their application in adsorbing and removing pollutants from water is limited. In this paper, with nitrile rubber sponge as the substrate, UiO-66-NH 2 /sponge composites were firstly in-situ synthesized and systematically evaluated UiO-66-NH 2 as an adsorbent to remove 2,4-dichlorophenoxyacetic acid from water. This composite could not only remain the adsorption capacity for 2,4-dichlorophenoxyacetic acid of UiO-66-NH 2 , but also was much more convenient for separation after the adsorption compared to UiO-66-NH 2 . In addition, the mechanism of the adsorption of UiO-66-NH 2 for 2,4-dichlorophenoxyacetic acid were discussed in detail. Electrostatic interaction between UiO-66-NH 2 and 2,4-dichlorophenoxyacetic acid was the main adsorption mechanism. The adsorption was mainly suitable for Langmuir isotherm models, and its maximum adsorption capacity of 2,4-dichlorophenoxyacetic acid was 72.99 mg g −1 .
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 8
·2864-2872
·
IF 6.119
Xiaoli Li,Yuan Tang,Yue Jiang,Manman Mu,Xiaohong Yin
A series of composites composed of Bi4O5Br2 and Fe-MIL were successfully fabricated for mimicking sunlight-driven photocatalytic reduction of CO2. Herein, Bi4O5Br2, as a modulator of solid acids, could turn NH2-MIL-101(Fe) into NH2-MIL-88B(Fe) completely at 0.07 wt% catalytic loading, where further addition could construct the corresponding composites of Bi4O5Br2 and NH2-MIL-88B(Fe). The highest activity in the photocatalytic reduction of CO2 was achieved at 7.96 μmol g−1 h−1 of CH4 at 3.28 wt% of Bi4O5Br2. Besides, this catalyst possessed high photostability during the recycling experiments and the mechanism of this process was thoroughly explored. This study provides a novel strategy employing solid acid modulators for regulating the structure and morphology of MOFs showing high activity and stability in the photocatalytic reduction of CO2 to CH4.
研究领域:
材料科学
·
环境科学
·
化学
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DOI
高影响因子
AIP Advances
·
2017
·Vol. 7
·期 10
·
IF 1.568
Luo Jiangqi,Fu Qiong,Wang Haiyun,Zhao Dongmei,Luo Laihui,Li Weiping
In order to seek for the single-phase multiferroic metal-organic frameworks (MOFs) materials, we prepared a multiferroic material [NH 2 -CH + -NH 2 ]Co(HCOO) 3 (FMDCo) by solvothermal method. We found that it had weak ferromagnetism below 12.5 K with the coercive fields ( H c ) of 560 Oe, remnant magnetization ( M r ) of 7.67 emu/g and saturation magnetization ( M s ) of 10.3 emu/g and exhibited obvious dielectric relaxation. The octahedral metal ions (Co 2+ ) were linked by formate (HCOO - ) ligands. The AmineH + cation (NH 2 -CH + -NH 2 ) were located within the cube-like cavities of the framework and formed extensive hydrogen bonds with the framework. This improved the phase transition temperature and thermal stability. This finding helps to understand the nature of magnetic and electric ordering in the MOFs.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Yanjia Zhou,Xiao-Dong Tang,Jingjing Li,Da-Yong Qing,Hong Wang
MIL-101(Cr) and MIL-100(Fe) are both representative MIL-type Metal-Organic-Frameworks (MOFs) materials, renowned for their large specific surface areas and size-tunable characteristics, making them suitable candidates for Li+ extraction from lithium-containing solvent. By introducing -NH2 functional groups and using LiNO3 as both a template and mineralizer, the functionalized MOF materials Li/NH2/MIL-101(Cr) and Li/NH2/MIL-100(Fe) were synthesized. Following modification, their Li+ adsorption capacities were increased, reaching 43.58 and 38.22 mg/g, respectively. The dosage of mineralizer, initial Li+ concentration, adsorbent dosage, solution pH value, and temperature all have an impact on the adsorption capacity of adsorbents. In addition, through the establishment of the pseudo-first-order kinetic model, pseudo-second-order kinetic model, as well as Langmuir and Freundlich thermodynamic models, it can be known that the adsorption of the materials belonged to monolayer chemisorption, and the adsorption process was exothermic. Furthermore, both adsorbents showed good reusability, retaining over 85% of their initial adsorption capacity after four adsorption-desorption cycles, highlighting their practical applicability in lithium recovery processes. In Mg-Li mixed solution systems, both materials exhibited exceptional Li+ selectivity. At a low Mg2+/Li+ ratio of 3, the separation factor (α) exceeded 80; even at a high Mg2+/Li+ ratio of 10, α remained near 50. Additionally, in systems with coexistence of multiple interfering ions, the distribution coefficient (Kd) followed the order: Li+ ≫ Mg2+ > Ca2+ > Na+ > K+. In the mixed systems, Li/NH2/MIL-101(Cr) and Li/NH2/MIL-100(Fe) exhibited certain separation effect for Li+ against competing cations.
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Jiaxin Wang,Shenghua Liu,Xiaoqian Feng,Lijiao Chen,Huan Wang,Yonghua Zhao,Qijian Zhang,Haiyan Wang,Xinwen Guo
Dry reforming of methane (DRM) is a promising route for the simultaneous conversion of CO2 and CH4; despite the effectiveness of C–H bond activation ability of Ni-based catalysts, they face serious challenges due to coking. Herein, two metal–organic frameworks (MOFs), NH2-MIL-53 and MIL-53 were loaded with Ni via impregnation and calcined at different temperatures to prepare Ni/Al2O3 catalysts. The results reveal that the Ni-based catalyst derived from NH2-MIL-53 possesses a higher specific surface area (SSA) due to the presence of –NH2 groups, which remarkably improved the dispersion of Ni. Additionally, the calcination temperatures are found to play an important role. Low-temperature calcination leads to weaker metal–support interaction (MSI) while high-temperature calcination results in lower specific surface area (SSA) and agglomeration of the active component Ni. The Ni/Al2O3 catalyst calcined at 850 °C exhibits moderate MSI and high SSA, leading to excellent catalytic activity (CH4 conversion ∼68%, CO2 conversion ∼80%) and stability (>50 h with coking ≈0.022 mmol C·gcat–1·h–1) at 750 °C with a GHSV of 96,000 mL/(gcat·h). The derived porous alumina restricts Ni sintering. In situ DRIFT results show that such a catalyst benefits the formation of key intermediate b-HCOO* due to high Ni dispersion. This work provides new insights and directions for optimizing the performance of MOF-derived catalysts.
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DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 2.892
Juan Han,Li Wang,Yun Wang,Jian Dong,Xu Tang,Liang Ni,Lei Wang
A geometrically symmetric four – arm dendritic polymer 4-arm-PEG-NH 2 was employed to modify on the surface of Fe 3 O 4 as support for cellulase immobilization. Glutaraldehyde was used as a coupling agent of this magnetic support to covalently immobilize cellulase. The morphology and properties of the synthesized magnetic material were characterized by Fourier transform infrared (FT-IR) spectroscopy, vibrating-sample magnetometer (VSM), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The properties of immobilized enzyme such as the optimum temperature and pH, Michaelis constant, thermal stability, reusability and storage stability were investigated. The loading capacity of cellulase was 132 mg/g. Compared with free cellulase, immobilized cellulase showed wider pH and temperature ranges, higher operational stability and good storage stability. Besides, the results of hydrolysis filter paper and microcrystalline cellulose showed that the catalytic effect of immobilized cellulase on the free cellulase was increased by about 76%.
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DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Peipei Huang,Lili Yao,Qing Chang,Yunhan Sha,Guodong Jiang,Shenghua Zhang,Zhe Li
The slow redox rate of Fe(III)/Fe(II) couples is a rate-limiting step for Fenton-like performance of Fe-MOFs. In this study, a series of catalysts (MIL-101) with various p-phthalic acid/2-aminoterephthalic acid (H 2 BDC/NH 2 –H 2 BDC) molar ratios were prepared using a simple and mild chemical method and applied for catalyzed degradation of bisphenol A (BPA). Interestingly, the –NH 2 modified MIL-101(Fe) can adjust Fe-Oxo node by increasing the electron density of Fe(III) in the presence of –NH 2 group with high electron density, thus forming Fe(II) in situ in MOFs. Meanwhile, the –NH 2 groups used as electron-donors can promote electron transfer , resulting in faster Fe(III)→Fe(II) half-reaction and active H 2 O 2 to continuously generate •OH radical. The BPA degradation and rate constant of Fe-BDC-NH 2 /H 2 O 2 system are 15.4-fold and 86.8-fold higher than that of Fe-BDC/H 2 O 2 system, respectively. The density functional theory (DFT) calculations showed that Fe-BDC-NH 2 possesses higher Fermi level energy (−4.88 eV) and lower activation energy barriers (0.32 eV) compared with Fe-BDC. Moreover, Fe-BDC-NH 2 showed good reusability and stability. This work offers a highly efficient and stable MOFs-based Fenton-like catalyst to rapidly degrade organic pollutants over a wide pH range for potential applications in wastewater treatment .
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PubMed
高影响因子
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