ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaohui Niu,Simeng Yan,Rui Zhao,Hongxia Li,Xiaoyu Liu,Kunjie Wang
In the pursuit of chiral materials with significant chiral recognition effects and stability, various strategies have been explored, among which the integration of metal nanoparticles and chiral metal–organic frameworks (CMOFs) is highly promising. However, metal nanoparticles (MNPs)/CMOFs show high chiral properties but inferior stabilities due to the MNPs being easily detached from the outside layer under certain conditions. Sandwich MOFs@MNPs@CMOF chiral materials can overcome this dilemma because the sandwich structure can maximize the regulation of the chiral interface activity, while the controlled outer layer can stop the MNPs from falling off in the procedure of chiral recognition. Here, a novel sandwich chiral material (d-His-ZIF-8@Au@ZIF-8) was synthesized by a ligand-assisted strategy with a well-defined sandwich morphology and chiral recognition capabilities. The electrochemical chiral recognition showed that d-His-ZIF-8@Au@ZIF-8 was the most efficient for the enantiomer of phenylalanine (Phe). This experiment presents a novel perspective for the fabrication of a chiral electrochemical sensing platform based on a solid sandwich chiral nanocomposite.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 43
·16645-16651
·
IF 7.367
Guangchao Zheng,Zhuwen Chen,Kadir Sentosun,Ignacio Pérez-Juste,Sara Bals,Luis M. Liz-Marzán,Isabel Pastoriza-Santos,Jorge Pérez-Juste,Mei Hong
Shape control in metal–organic frameworks still remains a challenge. We propose a strategy based on the capping agent modulator method to control the shape of ZIF-8 nanocrystals. This approach requires the use of a surfactant, cetyltrimethylammonium bromide (CTAB), and a second capping agent, tris(hydroxymethyl)aminomethane (TRIS), to obtain ZIF-8 nanocrystals with morphology control in aqueous media. Semiempirical computational simulations suggest that both shape-inducing agents adsorb onto different surface facets of ZIF-8, thereby slowing down their crystal growth rates. While CTAB molecules preferentially adsorb onto the {100} facets, leading to ZIF-8 particles with cubic morphology, TRIS preferentially stabilizes the {111} facets, inducing the formation of octahedral crystals. Interestingly, the presence of both capping agents leads to nanocrystals with irregular shapes and higher index facets, such as hexapods and burr puzzles. Additionally, the combination of ZIF-8 nanocrystals with other materials is expected to impart additional properties due to the hybrid nature of the resulting nanocomposites. In the present case, the presence of CTAB and TRIS molecules as capping agents facilitates the synthesis of metal nanoparticle@ZIF-8 nanocomposites, due to synergistic effects which could be of use in a number of applications such as catalysis, gas sensing and storage.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Jian-Lei Qi,Dan Zhou,Qin-Qin Xu,Jian-Zhong Yin,Kun-Peng Yu,Hai-Xin Sun
In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac) 2 as the precursor using the supercritical CO 2 deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images confirmed the formation of uniformly dispersed Pd atoms. Supercritical CO 2 has the advantage of zero-surface tension and high diffusibility, it can carry the molecules of Pd precursor into the micropores of ZIF-8. The dissolution and diffusion of precursor were observed by a visual view cell and the mechanism of the preparation was analyzed. Finally, semi-hydrogenation of phenylacetylene to styrene was performed to evaluate the catalytic activity of the prepared Pd-ZIF-8 catalyst. The conversion rate of 80.7% and selectivity of 92.2% were obtained at 70 °C and 4 h in the semi-hydrogenation of phenylacetylene.
研究领域:
催化化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 16
·5425
·
IF 3.4
Shuo Xiao,Zheng Jiao,Xuechun Yang
Triethylamine (TEA) is a typical volatile organic compound (VOC) widely present in air and water, produced in industrial production activities, with high toxicity and great harm. Fluorescence detection and resistive sensing are effective methods for detecting pollutants. Here, In-doped interpenetrating twin ZIF-8 and its annealed derivatives have been successfully designed and prepared as a multifunctional TEA sensor. On the one hand, ZIF-8-In exhibits excellent fluorescence emission enhancement at 450 nm in a dose-dependent manner to TEA in water within the concentration range of 1–100 ppm, with a detection limit as low as 1 ppm. On the other hand, the annealed ZIF-8-In derivative is ZnO/In2O3with a porous hierarchical structure, which is a perfect sensitive material for manufacturing gas sensors. Within the concentration range of 1–100 ppm, the ZnO/In2O3gas sensor has a high response for 100 ppm TEA, reaching 107.7 (Ra/Rg), and can detect TEA gas as low as 1 ppm. Furthermore, the response of ZnO/In2O3sensors to TEA is at least 10 times that of the other four VOC gases, demonstrating excellent gas selectivity. This multifunctional sensor can adapt to complex detection situations, demonstrating good application prospects.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ruimin Zhu,Lucy Wang,Huayu Zhang,Chunjie Liu,Zhengbao Wang
ZIF-8 membranes have attracted extensive research attention due to their ease of synthesis, stable properties, and wide applicability. Compared to expensive inorganic supports, organic polymer supports are more flexible and inexpensive. However, addressing the issue of weak adhesion between the surface of the organic support and the ZIF-8 membrane layer poses a significant challenge. In this study, we present a strategy for preparation of ZIF-8 membrane by the fabrication of an asymmetric dual-layer polymeric hollow fiber support using polyvinylidene fluoride (PVDF) as the material. The outer layer of the support is composed of PVDF embedded with ZIF-8 seeds, while the inner layer consists of pure PVDF. This approach addresses the weak adhesion between the support and the ZIF-8 membrane layer formed through a one-step solvothermal crystallization process. The effects of ZIF-8 seed size, content, and crystallization conditions on the membrane structure and performance are investigated. Under the synergistic molecular sieving effects of ZIF-8 continuous membrane layer and ZIF-8 crystals within the outer layer of the support, larger gas molecules are difficult to penetrate the membrane layer, making the resulting membrane highly selective for the gas separation. Under the optimal fabrication conditions, the H 2 permeability of the ZIF-8 membrane is determined to be 1.52 ± 0.1 × 10 −7 mol·Pa −1 ·s −1 ·m −2 , with a H 2 /N 2 ideal separation selectivity of 69.5 ± 4. This method demonstrates simplicity and high reproducibility for preparation of ZIF-8 membranes on dual-layer hollow fibers, and it is expected to be extended to the growth and fabrication of other MOF membranes.
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
ChemNanoMat
·
2021
·Vol. 7
·期 12
·1348-1354
·
IF 3.154
Jidong Bu,Chenxue Yao,Fengting Li,Shifeng Hou
Graphical A seeded growth synthetic strategy has been developed to synthesize ZIF-8 nanostructures in the form of multipods. Systematic studies were carried out to reveal the effect of several reaction parameters on the growth pattern and thus product morphology. We report a facile method to fabricate ZIF-8 nanostructures in the form of multipods. The success of this work relies on the use of seeded growth as the synthetic strategy, where uniform polyhedral ZIF-8 nanocrystals were prepared initially and served as seeds, followed by the addition of Zn precursor and imidazole to allow preferable growth to specific facets of the seeds and thus the formation of multipod structure. In particular, we were able to rationally synthesize ZIF-8 nanostructures in the form of hexapod and dendrite, respectively, using the similar seeded growth procedure, when the seed morphology was cube and truncated rhombic dodecahedron, respectively. Systematic studies were carried out to reveal the effect of several reaction parameters (e. g., seed amount and CTAB concentration) on growth pattern and thus product morphology. The current work demonstrates the feasibility and versatility of seeded growth for synthesis of colloidal metal-organic frameworks (CMOFs) with multipod structure and could find important use in fabrication of CMOFs with controlled sizes and shapes.
研究领域:
材料科学
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Daixiong Zhang,Qing Xiang
As one of most studied MOFs , extensive efforts have been devoted on the novel strategy for tailoring the size of zeolitic imidazolate framework (ZIF-8). We report here a facile and general method that enables the size-controllable engineering of zeolitic imidazolate framework (ZIF-8) by changing the addition order of Zn(NO 3 ) 2 ·6H 2 O (A) and 2-methylimidazole (B), which is very different from the all reported methods. Significant size difference for ZIF-8 s was observed between adding A-methanol solution to B-methanol solution and adding B-methanol solution to A-methanol solution under room temperature magnetic stirring. The influence of addition order on the crystal size was also applicable for preparing ZIF-8 encapsulating metal precursor (M-ZIF-8). We believe that this work not only pave a new way for efficient and general size-controllable design of ZIF-8 and M-ZIF-8, but can be also bridged with other size engineering methods (such as solvothermal method).
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
Membranes
·
2022
·Vol. 12
·期 2
·122
·
IF 4.562
Tong Li,Yuhong Wang,Xinyan Wang,Caixia Cheng,Kaifeng Zhang,Jie Yang,Guangshuo Han,Zhongpeng Wang,Xiuju Wang,Liguo Wang
Forward osmosis membranes have a wide range of applications in the field of water treatment. However, the application of seawater desalination is restricted, so the research of forward osmosis membranes for seawater desalination poses new challenges. In this study, zeolitic imidazolate framework-8 (ZIF-8) was synthesized by a mechanical stirring method, and its crystal structure, surface morphology, functional group characteristics, thermochemical stability, pore size distribution and specific surface area were analyzed. The cellulose acetate (CA)/ZIF-8 mixed matrix forward osmosis membrane was prepared by using the synthesized ZIF-8 as a modified additive. The effects of the additive ZIF-8 content, coagulation bath temperature, mixing temperature and heat treatment temperature on the properties of the CA/ZIF-8 forward osmosis membrane were systematically studied, and the causes were analyzed to determine the best membrane preparation parameters. The structure of the CA membrane and CA/ZIF-8 mixed matrix forward osmosis membranes prepared under the optimal conditions were characterized by Fourier Transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), contact angle and Atomic force microscope (AFM). Finally, the properties of the HTI membrane (Membrane manufactured by Hydration Technology Innovations Inc.), CA forward osmosis membrane and CA/ZIF-8 mixed matrix forward osmosis membrane were compared under laboratory conditions. For the CA membrane, the water flux and reverse salt flux reached 48.85 L·m−2·h−1and 3.4 g·m−2·h−1, respectively. The reverse salt flux and water flux of the CA/ZIF-8 membrane are 2.84 g·m−2·h−1and 50.14 L·m−2·h−1, respectively. ZIF-8 has a promising application in seawater desalination.Keywords:desalination;ZIF-8;forward osmosis membranes
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemNanoMat
·
2023
·Vol. 9
·期 7
·e202300073
·
IF 3.8
Lingling Xia,Yucen Li,Jiwei Cui,Ming Hu
Graphical Hollow ZIF-8 was embedded with polyphenol networks and polyethylene glycol networks. The double networks enhanced the stability of the hollow ZIF-8, showing promise in water treatment both by adsorption and photocatalysis. Hollow ZIF-8 particles are promising materials for water treatment because of the high porosity and catalytic activities under photon irradiation. However, hollow ZIF-8 particles can easily degrade under harsh conditions due to the weak stability. Here, we synthesize hollow ZIF-8 particles with polyphenol and polyethylene glycol networks embedded. The multiple interactions among the ZIF-8 frameworks and the networks increase the mechanical and chemical stability of the hollow ZIF-8 particles as suggested by a series of spectra. Uptake of methylene blue about 128 mg/g by the hollow particles is realized. Furthermore, hydroxyl or superoxide radicals for degradation of the adsorbed methylene blue are effectively generated through irradiation of the hollow ZIF-8 particles. In a water treatment test, the model pollute with a concentration of 50 mg/L is completely removed within half an hour. The performance of the recycled hollow ZIF-8 particles is proved to be significant, indicating the practical potential of the material.
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 Environmental Chemical Engineering
·
2025
·
IF 7.2
Peiqing Zhang,Sihang Li,Fan Xiao,Yongfang Xiao,Yi Zhang,Zhongguo Shan,Zhenyu Li,Haihua Wang
Membrane distillation (MD) represents a promising advance in wastewater purification, contributing to the mitigation of water scarcity. Hydrophobic poly(vinylidene fluoride) (PVDF) microporous membrane is susceptible to wetting by low surface tension substances, leading to fouling. To address this, PVDF membrane was superhydrophobically modified using modified ZIF-8 to obtain two composite membranes, AZ/PVDF and Z@C/PVDF. AZ/PVDF and Z@C/PVDF composite membranes were prepared by coating more dispersible APTES-ZIF-8 and ZIF-8@MWCNT, respectively, onto the surface of PVDF membrane. The hydrophobicity of the composite membranes was regulated by silane types, fluorination methods, and fluorination time, resulting in reduced surface roughness and increased surface energy. The contact angles of AZ/PVDF and Z@C/PVDF were 154.2 ± 3.4° and 156.8 ± 4.2°, respectively. Both AZ/PVDF and Z@C/PVDF membranes demonstrated outstanding mechanical, thermal, and chemical stability. AZ/PVDF and Z@C/PVDF membranes outperformed PVDF membrane, extending operation times by 2 h and 3 h, respectively, without obvious NaCl crystals. Furthermore, Z@C/PVDF membrane exhibited superior resistance to wetting by SDS than AZ/PVDF and PVDF membranes, treating pickle brine via the direct contact MD (DCMD) process with a recovery rate of 30.2 % within 10 h. Overall, this research offers a promising approach to fabricating superhydrophobic composite membranes for high-salt brine treatment via DCMD.
研究领域:
化学工程
·
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2018
·Vol. 19
·期 5
·1424
·
IF 3.687
Miaad Adnan,Kai Li,Jianhua Wang,Li Xu,Yunjun Yan
A hierarchical mesoporous zeolitic imidazolate framework (ZIF-8) was processed based on cetyltrimethylammonium bromide (CTAB) as a morphological regulating agent and amino acid (l-histidine) as assisting template agent.Burkholderia cepacialipase (BCL) was successfully immobilized by ZIF-8 as the carrier via an adsorption method (BCL-ZIF-8). The immobilized lipase (BCL) showed utmost activity recovery up to 1279%, a 12-fold boost in its free counterpart. BCL-ZIF-8 was used as a biocatalyst in the transesterification reaction for the production of biodiesel with 93.4% yield. There was no significant lowering of conversion yield relative to original activity for BCL-ZIF-8 when continuously reused for eight cycles. This work provides a new outlook for biotechnological importance by immobilizing lipase on the hybrid catalyst (ZIF-8) and opens the door for its uses in the industrial field.Keywords:adsorption method;biodiesel production;Burkholderia cepacialipase (BCL);hexahedral ZIF-8;hierarchical ZIF-8;surfactant
研究领域:
生物技术
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催化化学
·
可再生能源
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Changdie Cao,Yali Zhao,Yurun Dai,Yanying Wei,Qibin Xia,Haihui Wang
Sulphur hexafluoride (SF 6 ) is a commonly utilized insulation gas in electrical equipment because to its superior insulating capabilities and arc extinguishing characteristics, which holds high recycling value and necessity from the economic and environmental perspective. However, traditional method of recovering SF 6 based on cryogenic distillation is energy consuming, alternative separation technic is urgently required. Herein, a variety of ZIF-8 membranes fabricated via fast current-driven synthesis are proposed for N 2 /SF 6 separation. For a typical insulation gas in gas insulated switchgear comprising 70 % N 2 and 30 % SF 6 , the ZIF-8 membrane presents a N 2 /SF 6 selectivity up to 809 and a high N 2 permeance of 557 GPU with outstanding pressure resistance, which indicates that the ZIF-8 membrane separation would be an excellent new route for highly efficient SF 6 recovery.
研究领域:
材料科学
·
环境工程
✓ 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）