Journal of Materials Chemistry A
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2014
·Vol. 2
·期 22
·8246-8251
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IF 0
Aisheng Huang,Qian Liu,Nanyi Wang,Jürgen Caro
Inspired by the bio-adhesive ability of the marine mussel, highly hydrogen permselective ZIF-8 membranes were prepared on polydopamine functionalized stainless-steel-nets (SSNs). With polydopamine functionalization of SSNs under mild conditions, the nucleation and growth of well-intergrown ZIF-8 membranes were promoted through the formation of strong non-covalent and covalent bonds, which was helpful to enhance the membrane’s separation selectivity while maintaining high permeance. For binary mixtures at 100 °C and 1 bar, the mixture separation factors of H2–CO2, H2–N2, H2–CH4 and H2–C3H8, were found to be 8.1, 15.0, 23.2 and 329.7, which by far exceed the corresponding Knudsen coefficients and those of the as-reported ZIF-8 membranes. The ZIF-8 membranes also displayed high permeances, with the H2 permeance higher than 2.1 × 10−5 mol m−2 s−1 Pa−1 due to the high void volume of the SSNs.
研究领域:
材料科学
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膜技术
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气体分离
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金属有机框架材料（MOFs）
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DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
XinRan Ma,Haotong Li,Hui Yu,Gaohong He,Ning Zhang
Zeolitic imidazolate framework-8 (ZIF-8) membranes are promising for hydrogen purification due to their molecular-sieving capability, yet fabricating compact and defect-free crystalline layer remains challenging by conventional heterogeneous nucleation. Herein, we propose an interfacial engineering strategy using a porous 2D Co-MOF nanosheet seed layer to enable secondary growth of high-performance ZIF-8 membranes. Ultrathin Co-MOF nanosheets (∼2 nm) with mesoporous structures were synthesized via a water-assisted solvothermal method, assembled into a uniform seed layer on α-Al 2 O 3 , and activated by 2-methylimidazole vapor to enhance intergrowth of ZIF-8 polycrystalline layer. The optimized membrane achieves a H 2 permeance up to 6.0 × 10 −7 mol m −2 s −1 ·Pa −1 (∼1800 GPU) with an ideal H 2 /CO 2 selectivity of 13.38, surpassing the 2008 Robeson upper bound. Crucially, it maintains stable separation performance for an equimolar H 2 /CO 2 mixture over 100 h, with no detectable decay in permeance or selectivity. This work offers a scalable route to robust MOF membranes for industrial hydrogen recovery.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Xuebi Du,Huan Zeng,Qi Gao,Chen Li,Yin Quan,Lihua Chen,Shichao Feng,Yinhua Wan
In this study, the morphology of ZnO was altered from nanofibers to hollow nanotubes by Ce doping, mainly owing to the Kirkendall effect originating from different diffusion rates of constituent elements. A novel one-dimensional core-shell nanotube (ZnO-CeO 2 @ZIF-8) was successfully fabricated, characterized by a distinctive structure comprising a ZIF-8 shell and a ZnO-CeO 2 nanotube core. The as-prepared ZnO-CeO 2 @ZIF-8 exhibited a large specific surface area, substantial pore volume, and strong affinity towards CO 2 . These ZnO-CeO 2 @ZIF-8 were integrated into Pebax-1657 to construct MMMs for high-efficiency CO 2 transport and separation. Furthermore, the unique 1D hollow structure of the filler effectively reduced the resistance to mass transfer and enhanced gas permeability, while the ZIF-8 shell and Ce-induced oxygen vacancies synergistically enhanced the CO 2 adsorption and selectivity. The Pebax/ZnO-CeO 2 @ZIF-8 MMMs containing 3 wt% loading demonstrate superior performance, characterized by a CO 2 permeability of 94.0 Barrer and CO 2 /N 2 selectivity of 64.8 respectively. Compared to the unmodified Pebax, these values exhibit enhancements of 73.4% and 36.7%, suggesting that ZnO-CeO 2 @ZIF-8 holds considerable promise in the realm of MMMs for adsorption and separation of CO 2 .
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Journal of Physical Chemistry C
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2023
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IF 3.7
Yuchen Zhou,Yu Wang,Zezhi Chen,Huijuan Gong,Lu Chen,Huiqiang Yu
Carbonic anhydrase (CA) is an enzyme with unparallele d catalytic activity in CO2 hydration. However, its high cost and low stability seriously restrict its industrial application in CO2 absorption. Constructing CA mimics is a promising strategy to overcome the above limitations. However, to date, a majority of mimics reported are suffering from laborious synthetic processes, harsh synthetic conditions, and costly ligand materials. Therefore, developing novel CA mimics with higher applicability remains a high priority. Due to the structural similarity between zeolite imidazolate framework (ZIF)-8 and natural carbonic anhydrase (CA), ZIF-8 may be considered as a potential CA-mimetic catalyst for CO2 absorption. To validate this assumption, ZIF-8 and hydrophilic ZIF-8-TA were synthesized and the results from subsequent CO2 absorption experiments indicated that the synthesized catalysts could significantly enhance CO2 absorption in water and common alkaline solutions. The addition of 1.0 wt % ZIF-8 in water and different alkaline solutions respectively increased the average CO2 absorption rate by 42.35 and 6.78–24.51%, while the addition of 1.0 wt % of ZIF-8-TA increased the CO2 absorption rate by 81.80 and 18.16–34.39%, respectively. Besides, both catalysts possessed excellent reusability that they retained high performance even after five cycles of absorption and regeneration. Through esterase experiments, it was confirmed that ZIF-8 and ZIF-8-TA exhibited higher CA-mimetic activity than many reported CA mimics. Through density functional theory (DFT) calculations, it was indicated that the catalytic CO2 hydration pathway of ZIF-8 primarily involves four steps, including nucleophilic attack, rearrangement, replacement, and deprotonation, which is similar to that of natural CA, while ZIF-8-TA does not undergo the rearrangement step. Moreover, the electron-donation effect and van der Waals interaction of tannic acid endow ZIF-8-TA with higher catalytic activity.
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高影响因子
CRYSTAL GROWTH & DESIGN
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2023
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IF 3.8
Jiajun Zhong,Hao Wang,Yunpeng Liu,Lixiong Qian,Lei Yao,Xueqing Xing,Guang Mo,Zhongjun Chen,Zhonghua Wu
The leaf-like zeolite imidazolate framework (ZIF-L) with a lamellar structure is an excellent gas adsorption material. It is generally considered that the synthesis of ZIF-L must be carried out in an aqueous solution. In this study, an almost pure ZIF-L crystalline phase with nanoflake morphology was unexpectedly synthesized as the Zn2+ concentration in the methanol solution was greater than or equal to 0.36 M, and the molar ratio of Hmim to Zn2+ was fixed at 4:1. X-ray diffraction was used to characterize the crystalline structure of the product. X-ray absorption fine structure spectra were used to analyze the local atomic structure around Zn. Scanning electron microscopy was used to observe the morphology of products. Through air isolation experiments, it was found that the ambient moisture is a critical factor in determining the final product because the moisture not only penetrated the precursor solution but also participated in the synthesis of the ZIF-L phase. The as-prepared ZIF-L phase exhibits good CO2 adsorption performance. Its CO2 adsorption capacity is 1.09 for ZIF-Zn1, 1.04 for ZIF-Zn2, 1.42 for ZIF-Zn4, and 1.16 mmol/g for ZIF-Zn6 at ambient temperature and normal pressure. This study provides a moisture-assistant approach to synthesize the ZIF-L phase in a non-aqueous solution.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 17
·7319-7332
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IF 4.5
Hou Zhaoping,Tian Zihan,Zhao Junming,Yang Xinhe,Liu Liangliang
Zeolite imidazole framework-8 (ZIF-8), serving as a promising adsorbent for wastewater treatment, is limited in practical wastewater treatment due to its polycrystalline powder form resulting in poor recoverability. Herein, the millimeter-scale ZIF-8@porous mullite beads were prepared by the seeded-secondary growth method. The surface of the porous mullite beads is fully encapsulated by nanoscale ZIF-8 crystals, and the ZIF-8 crystals are anchored by mullite whiskers. This composition provides ZIF-8 with a stable macroscopic structure and maintains the exposure of its adsorption sites. Therefore, the ZIF-8@porous mullite beads exhibited good adsorption performance toward methyl orange (MO) and orange G (OG) in the aqueous solution. The analysis of adsorption kinetics indicating the adsorption efficiency of ZIF-8@mullite-w on MO and OG is influenced by the concentration of adsorbates and the adsorption sites. The maximum adsorption of ZIF-8@porous mullite beads on MO and OG was 16.5289 and 5.111 mg/g, respectively.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Yonghong Wang,Kaixin Wang,Xinru Zhang,Jinping Li
Carbon molecular sieve (CMS) membranes are widely used for the separation of similar molecular kinetic diameter gas. However, their performance is limited by a large amount of discontinuous porous structures and a few adsorption affinity sites. Herein, we first prepared magnetic Co@NC@ZIF-8 nanoparticles , followed by introducing it into the polyimides matrix to design precursor membrane with vertical nanochain-like particle distribution by magnetic field induction. Afterwards, hybrid carbon molecular sieve (HCMS) membranes were prepared by pyrolyzing precursor with high-temperature under N 2 atmosphere, which had ordered microporous architecture and Co-N-C structure. Resultant HCMS membranes prepared by magnetic field induction had excellent gas separation performance, whose CO 2 , N 2 and CH 4 permeabilities were 27,050, 2614 and 622 Barrer, with CO 2 /N 2 , CO 2 /CH 4 and N 2 /CH 4 selectivities of 10.4, 43.5 and 4.2 respectively. These values far exceeded 2019 CO 2 /CH 4 and 2008 N 2 /CH 4 upper bounds as well as approached 2008 CO 2 /N 2 upper bound. The superior performance resulted from the vertically ordered nanochain-like channels for gas transport, which dramatically shortens the transport path of gas molecules to intensify shape sieving potential. Moreover, the Co-N-C structure on the wall of channels could facilitate CO 2 transport due to the π complexation. Additionally, a large quantity of nitrogen sites in the carbonized Co@NC@ZIF-8 enhance CO 2 adsorption selectivity owing to the acid-base interaction. More remarkably, after 30-day aging testing, it was found that HCMS membranes prepared by magnetic field induction had exceptional aging resistance compared to the pristine CMS membranes and one without magnetic field induction under the same aging environments.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Chengcheng Wang,Hao Sun,Naixin Wang,Quan-Fu An
Zeolitic imidazolate framework (ZIF) membranes have great potential applications in nanofiltration. However, preparing continuous and intact ZIF membranes on the surface of a substrate remains challenging. In this study, we assembled ZIF-8 nanoparticles in situ in the pores of a porous alumina substrate via a freezing-assisted counter-diffusion method. Although a continuous ZIF-8 membrane was not formed on the surface of the substrate, the obtained nano-confined composite membrane was dense enough to separate antibiotics and salt. The rejection rate of tetracycline was above 99 %, while that of sodium chloride was below 20 %, demonstrating good antibiotic desalination performance. The permeance of the ZIF-8 membrane reached 23.5 LMH/bar. Due to the nano-confined structure, the obtained ZIF-8 composite membrane was robust. Besides, polishing the surface layer did not reduce the separation performance. Moreover, sulfurizing the ZIF-8 membrane improved its stability in water. It also improved the permeance to 31.3 LMH/bar, which remained stable for 100 h. Therefore, the obtained robust ZIF-8 membrane and its derivative composite membrane fabricated via freezing-assisted counter-diffusion have great potential in antibiotic desalination.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2023
·Vol. 58
·期 3
·1214-1228
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IF 4.5
Qian Guowen,Wang Junzhe,Yang Liuyimei,Zeng Zhikui,Zhao Zhenyu,Peng Shuping,Shuai Cijun
The insufficient of H 2 O 2 restricts the efficacy of chemodynamic therapy in tumor microenvironment. Calcium peroxide (CaO 2 ) is expected to solve this problem due to its H 2 O 2 -evolving ability. However, it prematurely decomposes in the moist air or water before reaching tumor site. In this study, zeolitic imidazolate framework-67 (ZIF-67) was in-situ grown on the surface of CaO 2 to construct a pH-responsive CaO 2 @ZIF-67 system and then incorporated into poly-L-lactic acid (PLLA) to prepare PLLA/CaO 2 @ZIF-67 scaffold by selective laser sintering technology. On the one hand, ZIF-67 is used as a chemodynamic therapy agent due to the release of cobalt ions after degradation. On the other hand, ZIF-67 can serve as protective layers to prevent premature decomposition of CaO 2 due to its hydrophobic properties, and then CaO 2 is exposed and reacts with water to form H 2 O 2 after the pH-responsive degradation of ZIF-67 under tumor acidic microenvironment. Results showed that the PLLA/CaO 2 @ZIF-67 scaffold could sustainedly produce H 2 O 2 under acidic pH and achieve 84.64% antitumor ratio against MG-63 cells. In addition, the scaffold also promoted proliferation and osteogenic differentiation of mouse bone marrow mesenchymal stem cells due to the release of calcium ions. The prepared PLLA/CaO 2 @ZIF-67 scaffold with chemodynamic antitumor and osteogenic effects has great potential to treat tumorous bone defect.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Huijie Zheng,Yawei Chen,Jiajia Yang,Peiyan Hao,Lijun Ren,Huiyun Zhou
A hierarchically porous ZIF-8 (HZIF-8) with pH-responsive and antibacterial activity was constructed using bicomponent hydrogel as template. The synthesized HZIF-8 was applied to load the antibacterial drug berberine hydrochloride (BBH). In vitro release studies showed that [email protected] and [email protected] displayed a sustained drug release profile, and the drug release rate increased with the decreasing pH value. The [email protected] with the highest drug loading capacity also had the highest cumulative drug release rate. At the end of 24 h, the cumulative release of BBH encapsulated in HZIFS, HZIFM and HZIFP were 92.07%, 86.60% and 88.00% at pH 5.0, respectively, higher than that of ZIF-8 (84.07%). Furthermore, in vitro antibacterial testing revealed that [email protected] exhibited efficient and long-lasting effects against Staphylococcus aureus , which was attributed to the synergistic bacteriostatic effect of Zn 2+ and BBH released by the structural degradation of [email protected] under acidic conditions. In conclusion, the study provides a strategy for synthesizing HZIF-8 and demonstrates the potential of HZIF-8 as a pH-responsive nanoplatforms for antibacterial applications.
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高影响因子
ACS Applied Nano Materials
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2022
·
IF 6.14
Hao Yu,Minghao Dou,Shuang Wang,Yuye Cheng,Zhiqiang Li,Hongyu Shao,Mengjie Yao,Xinrui Wang,Yanyan Chen,Shenjie Li
Although quantum dots (QDs) have unique properties that are different from conventional semiconductors, their photocatalytic activity and stability are far from expectations, and the preparation of semiconductor composites has become an important means to improve their photocatalytic hydrogen production performance. A convenient and safe coordination-assisted self-assembly method was used to encapsulate QDs into metal–organic frameworks and further formed AgInS2@ZIF-8/ZnS nanostructures by converting part of ZIF-8 into ZnS composite materials, which enhanced their photocatalytic hydrogen production performance and cycling stability. The results show that AgInS2@ZIF-8/ZnS nanocomposites have the highest photocatalytic activity (the average hydrogen production reaches 9.79 mmol·g–1·h–1; λ > 420 nm) after 6 h of sulfurization, which is far greater than that of AgInS2 QDs. Compared with the AgInS2@ZIF-8 composite, their performance is improved by nearly 10 times. In conclusion, a simple, safe, and easily-controllable method is used to prepare a novel and efficient photocatalytic material, which provides a new idea about the rational design of novel QD photocatalytic composites.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 11
·2201710
·
IF 3.6
Zihan Tian,Zhaoping Hou,Xinhe Yang,Liangliang Liu,Wanggang Zhang
Due to the wider bandgap and low electron discharge capacity, the zeolitic imidazolate framework (ZIF-8) shows low photocatalytic performance compared with conventional semiconductor materials. To enhance the photocatalytic activity of ZIF-8, the ZIF-8@AgNWs composite is synthesized via the in situ growth method using silver nanowires (AgNWs) as the photo-enhanced material. The obtained ZIF-8@AgNWs exhibit the fully encapsulated shell-core structure of ZIF-8-AgNWs. The UV−vis diffuse reflectance spectroscopy (DRS) analysis shows that the addition of AgNWs leads to a significant increase in light absorption of the ZIF-8@AgNWs composite, and the bandgap of the ZIF-8@AgNWs is 2.9 eV, with a significant decrease compared to pure ZIF-8 (4.96 eV). The ZIF-8@AgNWs-2 achieves the best photocatalytic activity for methylene blue (MB) degradation. Its degradation efficiency reaches 94%, and its apparent rate constant is 0.04371 min −1 . Herein, a novel strategy for the MOF-based photocatalytic materials with higher photocatalytic activity is provided.
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高影响因子
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