Catalysts
·
2022
·Vol. 12
·期 5
·521
·
IF 4.501
M. Abdur Rahaman,Bibimaryam Mousavi,Farah Naz,Francis Verpoort
Here, for the first time, a 2D and leaf-like zeolitic imidazolate framework (ZIF-L) is reported for the synthesis of ultrahigh molecular weight (UHMW) poly(methyl methacrylate) (PMMA) withMnup to 1390 kg mol−1. This synthesis method is a one-step process without any co-catalyst in a solvent-free medium. SEM, PXRD, FT-IR, TGA, and nitrogen sorption measurements confirmed the 2D and leaf-like structure of ZIF-L. The results of PXRD, SEM, TGA demonstrate that the catalyst ZIF-L is remarkably stable even after a long-time polymerization reaction. Zwitterionic Lewis pair polymerization (LPP) has been proposed for the catalytic performance of ZIF-L on methyl methacrylate (MMA) polymerization. This MMA polymerization is consistent with a living system, where ZIF-L could reinitiate the polymerization and propagates the process by gradually growing the polymer chains.Keywords:ultrahigh molecular weight polymer;poly methyl methacrylate;heterogeneous catalyst;zeolitic imidozolate framework
研究领域:
材料科学
·
高分子化学
·
催化
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jun Wang,Sirong Yu,Xiaoli Yin,Liyuan Wang,Guang Zhu,Kang Wang,Quan Li,Jing Li,Xizhen Yang
Inspired by the “lotus effect’’, more and more attention has been paid to the water repellent and self-cleaning surface. Due to its excellent properties, Mg alloy is considered to be one of the most promising engineering materials so far. However, the humid and corrosive environment makes Mg alloy susceptible to corrosion, which greatly limits its wide application. So it is very necessary to improve the properties of Mg alloy through surface treatment. Because of good chemical stability, thermostability and easy preparation, Zeolitic Imidazolate Frameworks (ZIFs) materials have been applied in the field of superhydrophobicity. In addition, in-situ growth has advantages of simple method, convenient operation and no need for expensive experimental equipment. Therefore, in this work, the superhydrophobic coating with cross-like Zeolitic Imidazolate Framework-L (ZIF-L) structure is fabricated on Mg alloy surface via a simple in-situ growth and low energy modification. The superhydrophobic ZIF-L coating on the Mg alloy substrate has excellent water repellency and self-cleaning property, and the stability test results show that it has good performance in thermostability and durability. Besides, the coating keeps superhydrophobic state after being immersed in an alkaline solution for 112 h, showing excellent resistance to alkaline solution. Therefore, the superhydrophobic coating prepared in this work can expand the application of Mg alloy in different service environments and provide a novel way for Mg alloy applying into more fields.
研究领域:
材料科学
·
表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jun-Fei Gu,Jichao Wang,Caixia Wang,Jin Li,Cheng Chen,Ni Zhang,Xiang-Ya Xu,Somboon Chaemchuen
Fe–N–C catalysts have emerged as the most promising alternatives to commercial Pt/C catalysts for oxygen reduction reaction (ORR) due to their cost-effectiveness and favorable activity. Herein, a dual-site Fe/FeN x -NC catalyst was synthesized via a green, in situ doping strategy using two-dimensional Fe-doped ZIF-L as a nitrogen-rich precursor. The catalyst integrated Fe nanoparticles (NPs) and FeN x sites anchored on carbon nanotubes, intertwined with nitrogen-doped porous carbon nanosheets, achieving a high active site density and graphitisation. Electrochemical tests revealed that the optimized Fe/FeN x -NC-1 exhibited significant ORR activity, with a half-wave potential of 0.92 V and 0.80 V for alkaline and acidic medium, respectively. Zn-air batteries employing Fe/FeN x -NC-1 delivered a peak power density of 168 mW·cm −2 and a specific capacity of 790 mAh·g −1 , outperforming those of Pt-based catalysts. Density functional theory calculations demonstrated a reduced free energy barrier for the rate-determining step (0.48 eV) compared to single-site Fe–N 4 models (0.79 eV). The synergy between Fe NPs and FeN x optimized ORR intermediate adsorption and facilitated charge/mass transfer. This study offers valuable insights for the development of advanced energy conversion systems.
研究领域:
材料科学
·
电化学
·
催化领域
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Weixing He,Tengteng Gu,Xijun Xu,Shiyong Zuo,Jiadong Shen,Jun Liu,Min Zhu
The hydrogen evolution and dendrite of Zn anode are the major troubles hindering the commercialization of aqueous Zn-ion batteries (AZIBs). ZIF-Ls, a typical metal–organic framework (MOF) with a highly ordered structure and abundant functional groups, seem to be the answer for the above bottlenecks. In this paper, a uniform ZIF-L layer was obtained on the Zn surface (Zn@ZIF-L) via an in situ synthesis method to moderate the solvation structure of solid–liquid interface electrolyte reducing the contact between water and Zn, thereby relieving the hydrogen evolution and corrosion. Furthermore, density functional theory (DFT) analysis reveals the binding energy of H (−4.01 eV) and Zn (−0.82 eV) for ZIF-L is superior to that of pure Zn (H (−1.49 eV) and Zn (−0.68 eV)). Due to the multifunctional ZIF-L layer, the Zn@ZIF-L can regulate Zn deposition to overcome the dendrite for obtaining a long-life Zn anode. Consequently, the modified Zn@ZIF-L anode can cycle for 800 h at 0.25 mA cm–2 for 0.25 mAh cm–2, while the bare Zn anode is only maintained for 422 h. Finally, a designed V2O5 grown on carbon cloth (V2O5@CC) was used as the cathode and coupled with the Zn@ZIF-L anode to assemble the full-cell. The Zn@ZIF-L//V2O5@CC full-cell possesses a capacity retention rate of 84.9% after 250 cycles at 0.5 C, prominently higher than Zn//V2O5@CC (40.7%).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Bin Jiang,Congcong Zhang,Na Yang,Qi Zhou,Longfei Zhang,Jingshuai Li,Wei Yang,Xiaodong Yang,Luhong Zhang
Developing highly active photocatalysts that can directly utilize clean, cheap, and sustainable solar energy to achieve an efficient carbon dioxide (CO2) cycloaddition reaction under mild reaction conditions (1 bar of CO2) remains a great challenge. In this paper, 2D/2D ZnIn2S4/Zn-NC S-scheme heterojunction composites were constructed by the in situ growth of layered ZnIn2S4 on the surface of two-dimensional (2D) ZIF-L-derived Znδ+ (0 ≤ δ ≤ 2) and N codoped carbon skeletons (Zn-NC-T) via a low-temperature solvothermal method. The optimized ZnIn2S4/Zn-NC-T photocatalysts exhibited favorable photocatalytic CO2 cycloaddition performance, and the yield of cyclic carbonate reached about 98.8% under 10 mmol epoxides reactant, 1 bar CO2 pressure, and full-spectrum irradiation for 4 h. The favorable photocatalytic performance is attributed to the efficient photothermal conversion and effective separation of photogenerated carriers induced by the carbon matrix and heterojunctions, respectively. In addition, the stability of the heterojunction structure and activity were demonstrated through cyclic experiments. Furthermore, the possible mechanism of S-scheme heterojunction photocatalytic CO2 cycloaddition is proposed through electron paramagnetic resonance (EPR) spectra, cyclic voltammetry (CV) experiments, and quenching experiments. The mechanism analysis proved that light irradiation is conducive to the transfer of photogenerated electrons from the conduction band of ZnIn2S4 to epoxides, promoting the formation of ring-opening intermediates, and photogenerated holes may promote the coordination and polarization of adsorbed epoxides. This work not only prepared an S-scheme heterojunction catalyst with excellent photocatalytic CO2 cycloaddition performance but also provided new insights for the rational design of heterojunction catalysts for photocatalytic CO2 cycloaddition.
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Rujing Xue,Yina Zhuge,Guoliang Liu,Fujuan Liu
ZIF-L, a metal-organic framework (MOF) material, has a two-dimensional (2D) foliation, a large specific surface area, excellent thermal stability and CO 2 adsorption performance, respectively. In this work, in order to further improve the thermal insulation performance of SiO 2 aerogel composite fabrics , ZIF-L powder was first prepared as a reinforcing particle, and then added to silica aerogel. Finally, SiO 2 /AF/ZIF-L composites were obtained by solution impregnation method. The influence of different ZIF-L concentrations on the insulation performance of composites and their influencing factors were studied. Furthermore, these composites were fully characterized using BET measurement, Instron 5967, precision transient thermal performance tester, infrared thermal imager, insulation performance test, thermogravimetric analyzer, and dynamic thermomechanical analyzer. The results showed that 0.12% SiO 2 /AF/ZIF-L composites had excellent thermal insulation performance, with a thermal conductivity as low as 0.029 W/(m·K). In addition, SiO 2 /AF/ZIF-L composites fabricated by atmospheric drying method had the best thermal insulation performance under the conditions of gel time of 24 h, hydrolysis time of 5 h, and polycondensation pH value of 5–6.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chan Pei,Heng Mao,Yu-Jie Wang,Wei-Min Liu,Zheng-Zheng Li,Wen-Wen Xie,Yan Li,Zhi-Ping Zhao
Mixed matrix membranes (MMMs) have been shown great performance and remarkable stability for diverse molecular separations. Considering that the density of MOFs is usually higher than that of polymer doping solution, the upper separation layer surface of MMMs is enriched by the polymer matrix, compromising the membrane performance. In this study, the asymmetric separation layer of MOF-filled MMMs was etched by the long-distance and dynamic low-temperature (LDDLT) plasma for enhanced ethanol permselective pervaporation. The thickness of separation layer decreased and the MOF amount on surface increased after the LDDLT plasma etching, which dramatically reduced the molecular permeation resistance and improved the membrane performance. Under optimal plasma conditions, the etched MMMs exhibited the superior permeation flux of 1120 g·m −2 ·h −1 (60% more than that of unetched membrane) and the separation factor of 12.3 (1.16 times as much as that of unetched membrane) in separation of 5 wt% ethanol aqueous solution at 40 °C.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Industrial Chemistry & Materials
·
2025
·
IF 11.9
Shenzhen Cong,Si Sun,YiJing Zhang,Ming Wang,Zhehua Jia,Jiaoyu Peng,Huan Pang
Metal-organic framework (MOF) membranes have received widespread research attention as a novel membrane material for H2/CO2 separation. The preparation of MOF membranes can be extended by constructing MOF membranes with homogeneous heterogeneous structure and the MOF membranes with high permeance and high selectivity can be prepared. Here, we use the chelation-assisted interfacial growth process to construct a seeding layer, and then prepare Co-Zn-ZIF-L membranes with homogeneous heterogeneous structure by secondary growth for the efficient separation of H2/CO2. The resulting Co-Zn-ZIF-L membranes show an H2 permeances of 2156 GPU and the H2/CO2 selectivity of 31.6 at 298K and 1.0 bar, surpassing the Robeson upper bond (2008). Furthermore, the Co-Zn-ZIF-L membrane has a H2/CO2 separation stability of 65 h and can efficiently separate to obtain pure H2.
研究领域:
材料科学
·
膜分离技术
·
化学工程
·
能源材料
·
气体分离
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Keming Zhang,Sihui Li,Xiaohe Tian,Rui Zhang,Xiaoting Feng,Qingnan Wang,Yanting Tang,Chenlu Liu,Hongxia Gao,Shaofei Wang
Metal-organic framework (MOF) membranes demonstrate significant potential for industrial gas separations, yet fabricating vertically aligned two-dimensional (2D) MOF membranes on polymer substrates remains a considerable challenge due to the weak adhesion and difficulty in achieving precise alignment. This study presents a one-step method for the rapid synthesis of vertically aligned ZIF-L membranes, using a polydopamine (PDA)-assisted approach. This method enables the rapid formation of homogenous, thin but defect-free membranes on polymer substrates within 5 min, drastically reducing the preparation time by over 200 times. The vertically aligned ZIF-L membranes, characterized by the interlayer galleries facing the gas mixtures, exhibit an excellent CO 2 permeance exceeding 1200 GPU and a CO 2 /N 2 selectivity of 14.5. The versatility of this approach allows for its application on various flat-sheet or even hollow fiber supports. Our findings highlight the potential of PDA-assisted synthesis for efficient, scalable preparation of high-performance MOF membranes for industrial gas separations.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Chenhan Xiong,Qiang Long,Jiaqi Chen,Yanqiu Yu,Xinming Lian,Rui Xue,Junjie Wang,Shufang Zheng,Guoping Du,Nan Chen
Effective design and construction of highly electrochemically active materials on conductive substrates with hierarchical nanostructures are critical for enhancing the electrochemical energy storage performance of electrodes. However, the design of such special structures is still challenging. In this study, a special three-dimensional@three-dimensional (3D@3D) NiCo-layered double hydroxide (NiCo-LDH) composite nanostructure is developed through the innovative approach of in-situ growth of arrayed Co-Zif-L on conductive substrate, disrupting the Zif-67 formation. This is followed by ion exchange process and electrochemical synthesis for growing 3D NiCo-LDH nanosheets. A unique structure with the 3D NiCo-LDH embedded in the 3D Co-Zif-L structure, termed as 3D@3D, is resulted. This spatial structure not only enhances their mechanical stability and adhesion strength through the in-situ growth process, but also provides a greater number of electrochemical active sites due to its ultra-large specific surface area. Density functional theory (DFT) calculations reveal that the NiCo-LDH@Co-Zif-L composite nanostructure exhibits an enhanced density of states (DOS) near the Fermi level compared to individual components, indicating excellent conductivity. With this unique structure, the NiCo-LDH@Co-Zif-L/NF electrode demonstrates an area-specific capacity of 4.1C cm −2 and retains 81.9 % of its initial capacitance after 5000 cycles. Moreover, the assembled hybrid supercapacitor achieves an energy density of 222.2 mWh cm −2 at a power density of 800 mW cm −2 (66.9 Wh kg −1 at 245 W/kg). The innovative approach in this work provides new insights into the utilization of Zif materials and designing electrode materials with special structures for high-performance electrochemical energy storage devices.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nan Yao,Shifeng Ji,Yunqing Xing,Jinchao Chen,Yanrui Cheng,Xiaonan Ruan,Jiaxin Chen,Zhuo Li,Yingjie Zhang,Chunmei Gao,Changbing Ye
This study reports the development and performance of a chlorine-resistant, negatively charged loose nanofiltration (LNF) membrane designed for efficient dye/salt separation from textile wastewater. The membrane was constructed by incorporating a synergistic composite of zeolitic imidazolate framework-L (ZIF-L) and polydopamine (PDA) into a polyamide layer on a polyethersulfone (PES) support via interfacial polymerization. In this design, ZIF-L nanosheets create a highly permeable, loose network, while PDA acts as a crucial molecular linker to ensure homogeneous dispersion and structural integration. Characterization using SEM, XRD, FTIR, XPS, and AFM confirmed successful synthesis. The optimal membrane, loaded with 2 wt% ZIF-L/PDA, exhibited superior performance: a pure water flux of 31.56 L·m −2 ·h −1 ·bar −1 , which is 3.19 times greater than the pristine Thin-Film Composite (TFC) membrane. This membrane achieved high dye rejection rates: Eriochrome Black T (99.25 %), Acid Chrome Blue K (97.87 %), Direct Blue 71 (97.56 %), Congo Red (94.09 %), and Direct Red 23 (93.92 %). Simultaneously, it showed low rejection for salts, indicating high permeability: NaCl (7.80 %), MgCl 2 (9.89 %), MgSO 4 (15.39 %), and Na 2 SO 4 (23.97 %). Crucially, the membrane demonstrated robust stability under diverse and harsh conditions, including exposure to strong acid, strong alkali, high pressure, and during long-term continuous operation, along with markedly enhanced chlorine resistance. Therefore, the ZIF-L/PDA loose NF membrane presents significant potential for dye wastewater treatment applications.
研究领域:
环境工程
·
膜科学与技术
·
化学工程
·
纳米技术
·
水处理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Heng Mao,Hong-Gang Zhen,Ali Ahmad,Shen-Hui Li,Yue Liang,Jun-Fan Ding,Yao Wu,Lin-Zhi Li,Zhi-Ping Zhao
High separation performance and superior mechanical properties of the membranes are both of critical importance for membrane modules to achieve high efficiency and long-term stability. Herein, a series of mixed matrix membranes (MMMs) with brick-and-mortar architecture are prepared by incorporating two-dimensional zeolitic imidazolate framework-L (ZIF-L) nanosheets into polydimethylsiloxane (PDMS) matrix for separating alcohols (ethanol, n -propanol or n -butanol) from aqueous solution. The unique leaf-like morphology, flexible pore structure , and high hydrophobicity of ZIF-L nanosheets allow the straight and preferential permeation for alcohols; while the brick-and-mortar architecture renders the tortuous and intricate pathways for water, thus improving the membrane selectivity. Incorporating ZIF-L nanosheets endows the membranes with outstanding pervaporation performance, together with unusual and favorable increase in mechanical properties. More interestingly, the subtle interconnection of ZIF-L nanosheets creates the relatively continuous pathways for penetrants. Consequently, the resultant membrane displays a high separation factor (57.6) and a comparable permeation flux (402 g m −2 h −1 ) in separating 1.0 wt% n -butanol aqueous solution at 40 °C. Furthermore, the presence of ZIF-L nanosheets donates good thermal properties and promising long-term stability to the membranes. The findings of engineering brick-and-mortar architecture through two-dimensional porous fillers may provide new insights into designing high-performance MOF-based membranes for various applications.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 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）