SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Peng Li,Yuxiu Sun,Zhengqing Zhang,Zhenjie Gu,Zhihua Qiao,Chongli Zhong
Metal-organic frameworks (MOFs) have driven the development of polycrystalline membranes in the field of gas separation owing to the strong adsorption-desorption behavior and stable framework structure. However, the poor heterogeneous bonding ability between crystals and the substrate leads to the unsatisfactory gas separation as well as low stability of MOF membranes, especially in the humid environment . Herein, we prepared a thin and defect-free UiO-66 membrane by a crystal heterogeneous nucleation assisted growth strategy for efficient CO 2 /N 2 separation. The addition of small amount of water in the precursor solution promoted the crystal nucleation process on the substrate surface. Meanwhile, the smooth PDMS interlayer guaranteed the heterogeneous well-intergrown of crystals into thin UiO-66 membranes, and provided a hydrophobic environment. Therefore, the dense UiO-66 membrane with a small thickness exhibited a high CO 2 permeance (177.4 × 10 −9 mol·m −2 ·s −1 ·Pa −1 ) with moderate CO 2 /N 2 selectivity (24.3) under humid conditions. Furthermore, the prepared membrane demonstrated excellent renewable performance after dehumidification at high temperature, and maintained good hydrothermal stability during long-term operation under the humid environment. This work provides a new insight for the design of high-quality MOF membranes and promotes the development of MOF membranes in practical gas separation process.
研究领域:
材料科学
·
化学工程
·
气体分离技术
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yunlong Li,Miao Liu,Yixian Liu,Lilong Zhou,Jilong Han,Zhengjie Li,Jimmy Yun,Runjing Liu
Two kinds of Ce-doped UiO-66 were synthesized by using CeCl 3 ·7H 2 O and (NH 4 ) 2 Ce(NO 3 ) 6 as cerium precursors, namely Ce(III)- and Ce(IV)-UiO-66. The effect of valence states of cerium precursors on adsorption performance towards Rhodamine B (RhB) was investigated for the first time. Ce atoms are in two valence states of +3 and + 4, where Ce 3+ ions turn their surfaces negatively charged. The higher cerium content (24.8%) and ratio of Ce 3+ /Ce 4+ ions (1.4:1) of Ce(IV)-UiO-66 made its surface more negatively charged, which is contributed to form stronger electrostatic interaction with cationic dyes. The adsorption amounts of RhB were 239.5 mg/g and 431.7 mg/g for Ce(III)- and Ce(IV)-UiO-66, which are 2.38 and 5.11 times higher than pristine UiO-66, respectively. The well-fit Langmuir model and pseudo-second-order model suggest a monolayer chemisorption process. The adsorption mechanism suggests that the electrostatic interaction and the complexation interaction between Ce 3+ and RhB are dominant factors affecting RhB adsorption. Since Ce 3+ severed as adsorption sites, the higher Ce content and stronger electrostatic interaction of Ce(IV)-UiO-66 together promoted its RhB adsorption than Ce(III)-UiO-66. The obtained results help to understand how the mixed-valences of incorporated metals affect the adsorption behaviors of bimetallic MOFs deeply.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2021
·
IF 4.051
Hailin Tian,Yan Gu,Houle Zhou,Yingping Huang,Yanfen Fang,Ruiping Li,Changcun Tang
In this work, bismuth bromideoxide (BiOBr), a typical visible-light photocatalyst , was coated with Zr-based MOFs (UiO-66) to prepare the BiOBr@UiO-66 photocatalysts with different mole ratios by the solvothermal method. The core–shell BiOBr@UiO-66 photocatalysts with abundant activated sites was obtained due to the modification of UiO-66 on the surface of BiOBr. The structure and properties of the BiOBr@UiO-66 photocatalysts were characterized by several methods. The 30% BiOBr@UiO-66 photocatalysts exhibited the biggest photodegradation rate constant (k = 0.0669 min −1 ) for RhB under visible-light irradiation than pure BiOBr (k = 0.0281 min −1 ) and UiO-66 (k = 0.0041 min −1 ). Additionally, the 30% BiOBr@UiO-66 photocatalysts exhibited the enhanced photocatalytic activity and stable recyclability due to the effective electron-hole separation and synergistic effect. The photocatalytic mechanism of the BiOBr@UiO-66 photocatalysts for RhB, which contained a photosensitization process, was discussed with the trapping experiment of active species and the proposed energy band alignments.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Dawei Lan,Huiwen Zhu,Jianwen Zhang,Fan Wang,Yueying Zheng,Zeyu Guo,Gang Yang,Mengxia Xu,Tao Wu
Metal-organic frameworks (MOFs) is a promising material that can be used in many fields, including environmental remediation. In this work, a novel adsorbent was successfully prepared by doping the Co element into the framework of UiO-66 with an in-situ oil bath synthesis. This modification ensured that the materials retained relatively good crystallinity. The Co-doping process had a major impact on the particle size and morphology of the original MOFs. The CoUiO-2 exhibited larger surface area and pore size than pristine UiO-66. Accordingly, the maximum adsorption amount of malachite green (MG) on CoUiO-2 (628.93 mg/g) was significantly larger compared with UiO-66 (343.64 mg/g), which was due to more active adsorption sites. In addition, the CoUiO-2 also showed a superior adsorption capacity on rhodamine B (RhB) (1106.22 mg/g). The adsorption process was well described by both the pseudo-second order and Langmuir models, indicating it was dominated by chemisorption and the adsorbent had a homogeneous surface area for adsorption. Therefore, the CoUiO-2 material could be a promising adsorbent for wastewater treatment . This work can provide an important insight into the modification of MOF materials and identify further opportunities to promote the adsorption performance in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiahe Chen,Yingying Zhang,Xin Guo,Yiyang Qiao,Ping Yu
Artemisinin (Art) is the primary therapies for plasmodium falciparum malaria. However, it is very cumbersome to extract artemisinin from the plant Artemisia annua L. Herein, a novel defect-type UiO-66 structure was proposed, which can adsorb artemisinin through effective sites provided by ‘template molecules’. At the same time, the delayed phase inversion technology was used to prepare the loofah membrane to make the defect-type UiO-66 uniformly dispersed in the pores. In addition, the inside of the biomass loofah membrane had good mechanical properties and loofah membrane wrapped with polyacrylonitrile (PAN) can make Art solution evenly dispersed in each channel, greatly improving the utilization rate of defect-type UiO-66. The defect-type UiO-66 and the UiO-66-D@loofah membrane were characterized using various methods, including SEM, EDS, FT-IR, XRD, contact angle, and mechanical performance analyses. Compared with the static adsorption behavior of powder and loofah membrane, it was found that the adsorption performance presented an optimal adsorption capacity (56.548 mg g −1 ) at the flow rate of 5 mL min −1 , which was better than that of powder (27.096 mg g −1 ) as well as the static loofah membrane (33.127 mg g −1 ). The structural design of the membrane has provided a new solution for the extraction of Art from Artemisia annua L.
研究领域:
材料科学
·
药物提取
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2017
·Vol. 19
·期 9
·2201-2211
·
IF 9.125
Wenxiu Cao,Wenhao Luo,Hongguang Ge,Yang Su,Aiqin Wang,Tao Zhang
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) is a crucial reaction included in many biorefinery schemes for the production of renewable chemicals and fuels. The development of highly stable supported Ru-based catalysts in the polar protic liquid phase under hydrothermal conditions is still a major challenge. Here, we prepared a 0.85 wt% Ru/ZrO2@C catalyst using a new stabilization strategy based on the UiO-66 (Zr-MOF) material. The catalytic performance of this Ru/ZrO2@C in LA-to-GVL was tested and compared with commercial 5 wt% Ru/C at 10 bar H2, 413 K in water and also in high protic aqueous solution (pH = 1). The full conversion of LA and quantitative yield of GVL were achieved with both catalysts. However, the 5 wt% Ru/C showed poor resistance to deactivation already after the first run. ICP, XPS, HRTEM, AC-STEM, TPR and physisorption data showed that quick deactivation of Ru/C was mainly caused by the leaching of ruthenium in addition to the loss of surface area via carbonaceous deposition in micro-pores. In contrast, the self-prepared Ru/ZrO2@C catalyst showed no apparent drop in catalytic performance either in water or in high protic aqueous solution upon multiple recycling, and no leaching of ruthenium was found even under harsh conditions (pH = 1). Remarkably, in the Ru/ZrO2@C catalyst, Ru (probable single-atom) was highly dispersed on nanotetragonal ZrO2 (3.3 nm), embedded in the amorphous carbon, and no apparent Ru nanoclusters were observed even after reactions. TPR results indicated that this excellent stability might be attributed to strong metal–support interaction between Ru and nanotetragonal ZrO2.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Shanqiu Liu,Enze Yu,Taotao Ge,Qing Liu,Yu Zhong,Wei Cui,Jie Yu,Jingguo Li
Nanocellular polymer foams are highly valuble for their lightweight nature, high strength, and unique nanostructures, which offer significant potential across a variety of applications. However, their production and practical use are limited by low cell nucleation efficiency and the requirement for extremely high-pressure foaming processes. In this study, we successfully fabricated poly(methyl methacrylate) (PMMA) nanocellular foams with a cell density on the order of 1012 cells cm–3 at a relatively low foaming pressure of 6.0 MPa. This achievement was made possible through the use of defective UiO-66 nanoparticles as nucleation enhancers, which demonstrated a high nucleation efficiency of 1.11. We synthesized four types of defective UiO-66 nanoparticles, each with varying levels of defects, and confirmed their efficacy as nucleators for PMMA nanofoams. The successful synthesis of these defective UiO-66 nanoparticles was verified using Fourier Transform Infrared Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy. The cell size and density of the PMMA nanocellular foams were characterized via SEM analysis. Our findings showed that the incorporation of defective UiO-66 nanoparticles markedly reduced the cell size of the PMMA foam, achieving a higher cell density. This improvement is attributed to a decrease in the free energy required for cell nucleation within nanocavities located at the matrix–nucleator interface. Consequently, the careful design of high-performance nucleating particles and the judicious choice of foam matrix components emerge as critical strategies in developing polymer cellular materials with nanoscale cell dimensions. These insights significantly advance the fabrication of polymer foams with enhanced thermal insulation properties and have broad implications for the field of cellular materials science. By optimizing nucleation mechanisms and material combinations, this work opens new avenues for the development of advanced cellular polymers tailored for applications requiring superior insulation or lightweight yet robust structures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Feng Ding,Xiong Shuai,Yanyan Chen,Donglan Zhang,Fangwei Qi,Cijun Shuai
Following peripheral nerve injury, a large number of macrophages will be recruited to the nerve defect site to regulate the immune microenvironment and then initiate a series of inflammatory reactions, which is not conducive to nerve repair. Electrical stimulation can not only affect the polarity of macrophages by regulating the immune microenvironment but also promote nerve regeneration by modulating voltage-gated ion channels. However, traditional electrical stimulation relies on power sources, wires, and implanted electrodes, which may pose risks of infection and secondary surgery. Here piezoelectric materials Ti3C2Tx/UiO-66 are synthesized by a hydrothermal method and then blended into PLLA to prepare a self-power nerve scaffold using laser additive manufacturing technology. Under ultrasound stimulation, UiO-66 nanoparticles can generate localized piezoelectric potential, while Ti3C2Tx nanosheets accelerate the charge transfer. The results indicate that a nerve scaffold promotes the current generation, with a current of up to 0.036 μA. The results indicate that electrical stimulation can promote the transformation of macrophages into the M2 antiinflammatory phenotype by inhibiting the Ca2+-CaMKII-NF-κB signaling pathway. Furthermore, the scaffold can upregulate the expression of bone marrow mesenchymal stem cell neural markers Tuj and Map under ultrasound treatment. This work provides insights into wireless electrical stimulation regulating the immune microenvironment to promote nerve repair.
研究领域:
生物医学工程
·
材料科学
·
神经科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1330-1342
·
IF 5.693
Zhang Fuhao,Cheng Wei,Yu Zhuanghua,Ge Shengsong,Shao Qian,Pan Duo,Liu Bin,Wang Xiaojing,Guo Zhanhu
A novel nanocomposite (WO 3 /UiO-66) was successfully synthesized by the microwave hydrothermal method. The influence of the W:Zr molar ratio on the WO 3 /UiO-66 structure was explored in detail, and the photocatalytic activity of the nanocomposite for photodegradation of rhodamine B (RhB) was evaluated. The WO 3 /UiO-66 with a W:Zr molar ratio of 1:5 (WO 3 /UiO-66–5) exerted the most excellent photocatalytic performance, and the photocatalytic efficiency reached 96.6% after 100 min of simulated sunlight irradiation, thereby showing a higher photocatalytic performance than pure UiO-66 or pure WO 3 . In addition, the stability and reusability of the nanocomposite were studied by cyclic experiments, and the degradation rate of WO 3 /UiO-66–5 still reached 86.6% after 5 cycles. The mechanism underlying the photocatalytic degradation of WO 3 /UiO-66 was finally studied by quenching tests, and the crucial factor in the RhB degradation was hole (h + ), and the existence of the n–n heterojunction also promotes the degradation of RhB by nanocomposites. In this work, an effective method is provided for the preparation of photocatalysts that degrade organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 36
·49068
·
IF 2.52
Bing Liu,Dan Li,Jie Yao,Hao Sun
Branched polyethyleneimine (PEI) functionalized UiO-66 were synthesized and used as fillers to fabricated mixed-matrix membranes (MMMs) for CO 2 /CH 4 separation. The purpose of introducing amino-functional groups in the filler is to improve the interfacial compatibility of the filler with the polymer through the formation of hydrogen bonds with the carbonyl group of 6FDA-ODA. Additionally, the amino group can facilitate CO 2 transport through a reversible reaction, enhancing the CO 2 /CH 4 separation properties of MMM. The chemical structure and morphology of fillers and membranes were characterized by employing X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), thermogravimetric (TGA), Derivative thermogravimetry (DTG) and scanning electron microscope (SEM). Furthermore, the effects of filler loading and feed pressure on CO 2 permeability and CO 2 /CH 4 selectivity have been investigated. MMMs present higher gas separation performance than pure 6FDA-ODA due to the presence of amino groups and the improvement of interface morphology. In particular, the MMM with 15 wt% loading of UiO-66-PEI shows optimum CO 2 permeability of 28.23 Barrer and CO 2 /CH 4 selectivity of 56.49. Therefore, post-synthetic modification of UiO-66 particle with PEI is a promising alternative to improved membrane performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 60
·90738-90751
·
IF 5.19
Zhang Xiaoting,Han Runping
In this study, a zirconium elemental organic framework (UiO-66-NH 2 ) was prepared by a green synthesis method and showed a good adsorption performance for removing 2,4-dichlorophenoxyacetic acid (2,4-D) from water. UiO-66-NH 2 was analyzed by a variety of characterization methods and the adsorption properties of 2,4-D on UiO-66-NH 2 were investigated by static adsorption experiments. The results showed that the adsorption of 2,4-D had a wide pH range (2–10) and good salt tolerance with the adsorption equilibrium time about 2 h. The maximum adsorption capacity from Langmuir was up to 652 mg g −1 at 303 K. The isotherms can be described by Langmuir model and the adsorption kinetics was consistent with pseudo-second-order kinetic model and Elovich model. The regeneration efficiency was still 95% after 5 cycles with 0.01 mol L −1 NaOH as desorption solution. The feasibility of practical application of UiO-66-NH 2 was explored by simulating actual wastewater at different pH. UiO-66-NH 2 is promising to remove 2,4-D from water. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Pu Zhou,Han Dong,Wanglin Zhang,Jiachen Liu,Yefei Tian,Yi Li,Jiabei Luo,Song Xiao,Kerui Li,Hongye Yuan
Developing metal–organic framework (MOF)-based sorbents with high water-uptake capacity and mild regeneration conditions remains challenging, but is highly sought after for addressing water shortages. Herein, we report a strategy for fabricating thermal-responsive Poly (N-isopropylacrylamide) (PNIPAM)/UiO-66 composite aerogels with variable PNIPAM loading by leveraging the ordered nanopores of UiO-66 colloids, enabling the confined polymerization of NIPAM monomers within the pores, which allows for controllable water capture and release at above 32 ℃. The thermal-responsive PNIPAM/UiO-66 composite aerogels, with varying PNIPAM loadings, demonstrated an outstanding maxima water capture of over 2100 wt% at room temperature and reversible release at above 32 ℃. This performance sets a new benchmark for the leading water-capture adsorbents reported in the literature, thanks to the extensive specific surface area of the aerogels and the unique hydrophilicity-hydrophobicity transition exhibited by the PNIPAM component. More intriguingly, the aforementioned phase transition can be directly visualized by incorporating 4-(1,2,2-triphenylvinyl) benzoic acid (TPE-COOH) molecules with the well-known aggregation-induced emission (AIE) effect into the aerogels. The remarkable water-uptake ability and mild release conditions showcased in this study open new possibilities for practical water harvesting.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）