DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 17
·5943-5950
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IF 4.39
Lu Feng,Jirong Lan,Fangyuan Chen,Haobo Hou,Hong Zhou
Metal–organic frameworks (MOFs), as a new class of proton conductors, have attracted much attention in the application of proton exchange membranes due to their precisely defined structure and tailorable functionality. However, for most of the MOF materials, their long-term stability is a huge barrier to practical application. Therefore, the structural stability of MOFs is an important prerequisite for the design and development of proton conductors with ultra-high conductivity. In this study, the stable UiO-66-NH2 is optimized as the precursor, and the modified material of DT-UiO-66 is designed and developed by introducing the 3,5-diamino-1,2,4-triazole molecule into the framework of UiO-66-NH2 through a post-synthesis strategy. Satisfactorily, DT-UiO-66 maintains the stability of the original skeleton. The alternating current impedance measurements indicate that a significantly improved proton conductivity of 4.47 × 10−3 S cm−1 is obtained at 100% relative humidity (RH) and 373 K for DT-UiO-66, which is attributed to the increasing number of proton sources and hopping sites. Moreover, DT-UIO-66 shows an outstanding stability under high temperature and high humidity conditions for at least 16 h, suggesting its potential application as a proton exchange membrane.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Ying Zhang,Bo Fu,Kuixue Liu,Yupeng Zhang,Xu Li,Shanpeng Wen,Yu Chen,Shengping Ruan
FeCl 3 -NH 2 -MIL-125(Ti) with different FeCl 3 content was prepared and characterized by XRD , SEM and XPS . The humidity sensing properties of FeCl 3 -NH 2 -MIL-125(Ti) have been investigated. Compared with NH 2 -MIL-125(Ti), FeCl 3 -NH 2 -MIL-125(Ti) was more effective in the humidity sensing. The optimal mixing ratio was FeCl 3 -NH 2 -MIL-125(Ti) (8 wt%), which exhibited the best linearity. The impedance of FeCl 3 -NH 2 -MIL-125(Ti) (8 wt%) decreases by almost three orders of magnitude in the range of 11%-95% RH. The response time and recovery time of the humidity sensor by FeCl 3 -NH 2 -MIL-125(Ti) (8 wt%) are 11 s and 86 s respectively. These results indicate the potential application of FeCl 3 -NH 2 -MIL-125(Ti) in humidity sensors.
研究领域:
材料科学
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传感器技术
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纳米材料
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功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yunqi Zhou,Ye Yuan,Xinlei Liu,Zhi Wang
Metal-organic framework (MOF) membranes with proper pore size distribution and functional groups are generally more suitable for separation. Most MOFs are characterized by a hierarchical pore structure, which possesses large cavities surrounded by small windows. Fabrication of MOF membranes only retaining microporous fragment structure is a workable method to narrow pore size distribution. In this study, well-grown NH 2 -MIL-101(Cr) fragment membranes were fabricated for CO 2 separation by adjusting acetic acid – ligand – metal ratio to balance the nucleation and growth. NH 2 -MIL-101(Cr) fragment has a similar chemical structure to NH 2 -MIL-101(Cr) as expected, but only small pores with size around 0.56 nm is retained. The NH 2 -MIL-101(Cr) fragment membranes exhibited CO 2 /N 2 selectivity of about 37 with CO 2 permeance up to 6104 GPU.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuchen Cui,Xiaolei Cui,Lubomira Tosheva,Chunzheng Wang,Yongming Chai,Zixi Kang,Qiang Gao,Kun Wang,Zhihan Zhang,Hailing Guo,Daohong Xia,Daofeng Sun
Effective separation of CO 2 from CH 4 is crucial for the purification of natural gas, which requires membrane materials with high permeability, selectivity, and stability of under high pressures. In this work, a high CO 2 -affinity MOF-based nanofiller (P in @NH 2 -UiO-66) was prepared and integrated in polyetherimide (PEI) to prepare mixed matrix membranes (MMMs) for enhanced CO 2 /CH 4 separation capabilities. The P in @NH 2 -UiO-66 nanofiller comprised an in situ-formed polyethyleneimine-NH 2 -UiO-66 composite prepared via a one-pot synthesis. The polyethyleneimine was covalently attached to the H 2 BDC-NH 2 ligand allowing for a stronger integration within the PEI matrix. The polyethyleneimine affects the nucleation of MOF, leading to miniaturization of the MOF particles. The smaller-sized filler is beneficial for improved interaction at the filler-matrix interface. The numerous amino functionalities grafted onto the NH 2 -UiO-66 increased the CO 2 adsorption sites, thereby enhancing the affinity for CO 2 . Owing to the improved interaction, the elevated CO 2 attraction, and the inherent properties of the porous NH 2 -UiO-66, the fabricated MMMs preformed superior in separating CO 2 /CH 4 . The 30-P in @NH 2 -UiO-66-PEI membrane (containing 30 wt% nanofiller) exhibited a CO 2 /CH 4 selectivity of 27.7 and a CO 2 permeability of 2498.9 Barrer. The CO 2 permeability was 21 times greater than that of the pristine PEI membrane, and 4 times higher compared to P@NH 2 -UiO-66 MMM with polyethyleneimine modified MOF filler prepared by a traditional wet impregnation method. Additionally, the novel MMM demonstrates excellent separation stability under conditions that mimic industrial settings, demonstrating its potential application for natural gas purification.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 65
·37733-37738
·
IF 3.049
Yanghe Fu,Jieyu Wu,Rongfei Du,Ke Guo,Rui Ma,Fumin Zhang,Weidong Zhu,Maohong Fan
Defect engineering can be a promising approach to improve the photocatalytic performance of metal–organic frameworks (MOFs). Herein, a series of defective NH2-UiO-66(Zr) materials were synthesized via simply controlling the synthesis temperature, with concentrated HCl as the modulator and then these as-prepared samples were used to systematically investigate the effects of their structural defects on photocatalytic CO2 reduction. Remarkably, these MOFs with defects exhibit significantly enhanced activities in photocatalytic CO2 reduction, compared with the material without defects. The defect engineering creates active binding sites and more open frameworks in the MOF, and thus facilitates the photo-induced charge transfer and restrains the recombination of photo-generated charges efficiently. The current work provides an instructive approach to improve the photocatalytic efficiency by taking advantage of the structural defects in MOFs, and could also inspire more work on the design of advanced defective 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
RSC Advances
·
2019
·Vol. 9
·期 43
·24802-24810
·
IF 3.049
Xu Zhang,Yufan Zhang,Tiecheng Wang,Zheng Fan,Guoliang Zhang
A facile controlled interfacial polymerization strategy was proposed for the synthesis of novel thin film nanocomposite (TFN) membranes for enhanced nanofiltration performance. UiO-66 nanoparticles were aminated and pre-immobilized onto a polymer substrate via polydopamine (PDA) coating to achieve a continuous and defect-free polyamide dense layer. The mediation of the PDA coating could not only enhance the structural stability of TFN nanofiltration membranes, but also improve the dispersion and anchorage of UiO-66-NH2, thus closely fixing the position of UiO-66-NH2 nanoparticles on the polymer substrate. Moreover, since the amino group (–NH2) further reacted with PDA via Michael addition or Schiff base reaction, the in situ mutual reaction reduced the nanoparticle losses significantly during the draining off of the monomer solution in the fabrication process, which effectively cut down the actual dosage. The results showed that the PDA interlayer could induce the tight attachment of the PA layer to the support, enhancing the structural stability of TFN membranes. Furthermore, the dosage of UiO-66-NH2 in the as-prepared TFN membranes could also be decreased to as low as 0.01 w/v%, which was nearly a 10–20-fold reduction in the required amount of UiO-66-NH2 for the synthesis. The fabricated TFN/UiO-66-NH2 membranes exhibited very high water permeance and competitive salt rejections in cross-flow nanofiltration, which shows the huge potential for the application of novel TFN membranes with controlled nanoparticle incorporation in industrial separation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yan Li,Jiangtao Liu,Kehu Zhang,Lei Lei,Zhongli Lei
A hybrid polymer–MOFs architecture UiO-66-NH2@PMAA was synthesized by tethering polymethacrylic acid (PMAA) onto the surface of the metal–organic frameworks UiO-66-NH2, and it was further employed for pectinase immobilization by electrostatic interactions. The hybrid architecture was prepared through a combination of atom transfer radical polymerization (ATRP), click chemistry and postsynthetic modification (PSM). The optimal immobilization parameters were at 25 °C and pH 4.0 with 10 U/mL of pectinase for 2 h, under which pectinase showed the highest enzymatic activity (1.215 U/mg) and protein loading (448.5 mg/g), respectively. Compared with free pectinase, the immobilized was found to exhibit higher pH, thermo, and storage stability. Additionally, the immobilized pectinase had remarkable reusability, the residual activity reached as high as 81% after 8 cycles continuously. Meanwhile, the desorption of immobilized pectinase can be achieved by changing pH values of the medium. Obviously, the UiO-66-NH2@PMAA with attractive properties is highly promising for enzyme immobilization.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Heming Deng,Haoshuang Gu
Two-dimensional membranes are considered the next generation separation membrane with great application potential due to their excellent separation performance, good mechanical strength and thermal stability compared with traditional membrane materials. In this work, the flexible NH 2 -UIO-66@MXene membrane was successfully prepared for gas separation by loading NH 2 -UIO-66 particles onto Ti 3 C 2 nanosheets based on an in-situ growth strategy. A LiF-HCl mixed solution was used as the etchant to obtain the Ti 3 C 2 nanosheets. The loading of NH 2 -UIO-66 particles can regulate the interlayer spacing of Ti 3 C 2 nanosheets, improving the specific surface area of Ti 3 C 2 and the adsorption capacity for specific gases. The -NH 2 group in NH 2 -UIO-66 enabled preferential adsorption of CO 2 over H 2 , and the CO 2 molecules adsorbed in the channel can even block the molecules passing through, increasing the resistance of CO 2 diffusion. As a result, the NH 2 -UIO-66@Ti 3 C 2 hybrid membrane realizes the selective separation of H 2 /CO 2 mixed gas, and the separation selectivity is as high as 155. The gas separation selectivity and permeation of the final prepared NH 2 -UIO-66@MXene were enhanced and exceeded the upper limit of Robeson upper bound (2017).
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Cheng Cheng,Dongyun Chen,Najun Li,Hua Li,Qingfeng Xu,Jinhui He,Jianmei Lu
This paper reports the application of NH 2 -MIL-125(Ti) modified carbon nitride C v -C 3 N 4 with carbon vacancies in the removal of NO. We performed a series of characterizations of the complex and compared various ratios with the individual components. The results of UV spectrum analysis show that the composite's range of light absorption expanded due to the modification of Ti metal–organic framework. Furthermore, the results of photocurrent and electrical impedance indicate the compound has a better ability to generate and transfer electrons . The increase in the compound's NO removal efficiency (up to 63%) indicates that MOF has a positive effect on C v -C 3 N 4 modification—a good method for photocatalysis . Moreover, the compound can promote photocatalysis in a favorable direction.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2025
·
IF 3.1
Yingxia Guo,Meichen Liu,Yajie Cheng,Jiye Tian,Chunpeng Feng,Qingbin Wang,Xuan Zhao,Lei Yin
Methoxy-polyethylene glycol amine (mPEG-NH₂), an important pharmaceutical excipient, has been extensively utilized in the field of biomedicine. To advance the development of mPEG-NH₂-related drug delivery systems, it is crucial to understand the safety profile and cellular pharmacokinetic behavior of mPEG-NH₂ polymers. In this study, a straightforward analytical assay based on ultra-high performance liquid chromatography and tandem mass spectrometry (UHPLC-MS/MS) for quantifying mPEG 5 -NH₂ in biological matrices was established and validated. Multiple reaction monitoring (MRM) transitions were selected for quantification of mPEG 5 -NH₂ (mass-to-charge ratio, m/z 252.1 → 87.7) and octaethylene glycol (OH-PEG 8 -OH) (mass-to-charge ratio, m/z 371.2 → 89.2). The UHPLC-MS/MS assay demonstrated excellent linearity within the concentration range of 0.01–10 μg/mL, with an R² value of 0.9996. Both intra-day and inter-day accuracies and precisions of the analytical method were within ± 9.19 %. This analytical assay was successfully applied to study the in vitro cellular toxicity and uptake behavior of mPEG 5 -NH₂ in MCF-7 cells. The results indicate that high doses of mPEG 5 -NH₂ may have potential toxicity to MCF-7 cells.
研究领域:
药物分析
·
毒理学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2015
·Vol. 62
·期 5
·1728-1739
·
IF 2.748
Hao Zhang,Yan Wang
Ethanediamine-modified zeolitic imidazolate framework (ZIF)-8 particles (ZIF-8-NH 2 ) is synthesized and incorporated in the poly(vinyl alcohol) (PVA) matrix to fabricate novel PVA/ZIF-8-NH 2 mixed matrix membranes (MMMs) for pervaporation dehydration of ethanol. The PVA/ZIF-8-NH 2 MMMs exhibit enhanced membrane homogeneity and separation performance because of the higher hydrophilicity and restricted agglomeration of the particles, as compared to corresponding MMMs loaded with unmodified particles. The effect of ZIF-8-NH 2 loading in the MMMs is studied and the MMM with a 7.5 wt % ZIF-8-NH 2 loading shows the best pervaporation performance for ethanol dehydration at 40°C. Various characterization techniques (Fourier transform infrared, scanning electron microscope, contact angle, sorption test, etc.) are used to investigate the MMMs loaded with ZIF-8 and ZIF-8-NH 2 particles. The impact of operation conditions on pervaporation performance is also performed. The performance benchmarking shows that the MMMs have superior separation factors and comparable flux to most other PVA hybrid membranes. © 2016 American Institute of Chemical Engineers AIChE J , 62: 1728–1739, 2016
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Aisheng Huang,Linlin Wan,Jürgen Caro
In a detailed study, the influence of microwave irradiation, synthesis time and temperature, addition of acetic acid (HAc) as a modulator on the morphology, crystallinity and stability of UiO-66-NH 2 is investigated to develop a reliable and reproducible strategy for the preparation of well-shaped UiO-66-NH 2 . The UiO-66-NH 2 were characterized by powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and gas adsorption. It is found that well-shaped UiO-66-NH 2 with a high CO 2 adsorption capacity can be synthesized in a short time by microwave heating. The UiO-66-NH 2 crystals synthesized by microwave heating are of high quality and show a superior CO 2 adsorption capacity (5.8 mmol/g at 273k and 1 bar) due to the strong interactions between the −NH 2 group and CO 2 . The CO 2 /N 2 selectivity of the obtained UiO-66-NH 2 at 298 K and 1 bar is 66, which is much higher than that of the pristine UiO-66 of 17.8.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 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）