TALANTA
·
2017
·
IF 4.162
Man Zhao,Yiqin Xie,Hemei Chen,Chunhui Deng
Zeolitic imidazolate frameworks (ZIFs) are composed of tetrahedral transition metal ions and imidazolate type organic linkers. This kind of metal organic frameworks (MOFs) combines the unique properties of both zeolites and MOFs. Furthermore, ZIFs can be assembled under mild biocompatible conditions. These advantages make them be primarily studied for biochemical analysis. In this work, polydopamine-modified hydrophilic magnetic ZIFs were synthesized in a simple and mild way for the efficient extraction of low-abundance peptides. Thanks to the low-coordinated Zn 2+ ions, the Fe 3 O 4 @PDA@ZIF-8 composites showed strong affinity towards low-abundance peptides, especially those with histidine residues . After enrichment, the sequence coverage of BSA and HSA tryptic digest got a significant increase. The solid phase method based on the magnetic ZIFs exhibited size-exclusion effect towards large-sized proteins, and proved to be effective even under the 200-fold dilution with BSA protein solution.
研究领域:
生物化学
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分析化学
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DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2021
·Vol. 38
·期 5
·1032-1042
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IF 3.309
Xu Li,Qin Yu,Liu Liying,Xiao Juntian,Ding Zhongwei
The membrane contactor has been considered an effective device to capture CO 2 , but its performance is limited by membrane wetting phenomena. In this work, the ZIF-8/ZIF-L (zeolitic imidazolate framework) based composite membrane with excellent hydrophobic stability and CO 2 permeability was successfully fabricated by coating the dense layer on the porous PVDF (polyvinylidene fluoride) substrate. The dense layer was developed by evenly incorporating ZIF-8 nanocrystals and ZIF-L nanosheets into the polydimethylsiloxane (PDMS) polymer. The as-prepared membrane possessed competitive hydrophobicity with a water contact angle (WCA) of 131.8°. And after a ten-day immersion test in CO 2 absorbent, the WCA only declined by 9.8%, exhibiting excellent hydrophobic stability. Besides, the CO 2 permeability of the composite membrane was 61.8×10 −8 ·mol·m −2 ·s −1 ·Pa −1 with an ideal CO 2 /N 2 separation factor of ∺20, which was effectively improved in comparison with the control membrane. In the CO 2 absorption experiment, the prepared membrane achieved the competitive CO 2 flux of 3.02×10 −3 ·mol·m −2 ·s −1 when the liquid velocity was 0.25 m·s −1 and displayed robust long-term operating stability. Finally, the AC impedance technique was applied to continuously monitor the wetting state of composite membranes, which further investigated their anti-wetting ability.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
MATERIALS & DESIGN
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2019
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IF 5.77
Wentao Zhang,Shuo Shi,Xinnan Liu,Xinyi Ren,Min Li,Tianli Yue,Shaohui Ouyang,Jianlong Wang
Constructing MOFs-composite catalyst with satisfactory catalytic efficiency as well as low cost still presents a major challenge. In this work, a low-cost modular photocatalyst with controllable activity is facilely fabricated by embedding ZIF-8 nanocrystal clusters with ammonium tetrathiomolybdate (ATTM) (donated as ZIF-MS). The embedded ATTM molecules can not only serve as photocatalytic sites but also alter the nucleation and morphology of the resulted ZIF-MS, showing controllable activity for catalytic application. Under the optimized proportion of precursors, 576.52 nm ZIF-MS nanocrystal cluster composed of 24.70 nm grain, showing high activity and size selectivity for the photocatalytic degradation of environmental pollutants, was obtained. The combination of size-selectivity of structure-tunable ZIFs with high photocatalytic activity of embedded noble-free inorganic photocatalytic agent makes these ZIF-MS ideal candidates for photocatalytic applications.
研究领域:
材料科学
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环境科学
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高影响因子
CRYSTENGCOMM
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2016
·Vol. 18
·期 21
·3842-3849
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IF 3.849
Chunping Gao,Qi Shi,Jinxiang Dong
The performance of two hydrophobic zeolitic imidazolate frameworks, MAF-6 and TIF-1 Zn, in adsorptive separation of 1-butanol from acetone–butanol–ethanol model fermentation broth was studied and compared to the data reported for ZIF-8. It was found that, in single-component systems, the adsorption capacities of ZIF-8 and MAF-6 were larger than that of TIF-1 Zn, mainly because of their larger pore volume; however, the time necessary to reach equilibrium was shorter when TIF-1 Zn with a larger pore aperture was used. In breakthrough experiments, it was shown that the adsorptive separation mechanism on ZIF-8 and MAF-6 was based on combined thermodynamics and kinetic effects; on TIF-1 Zn, thermodynamic adsorption took place.
研究领域:
生物工程
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化学工程
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2016
·Vol. 24
·期 3
·613-620
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IF 1.385
Fu Yuanyuan,Zhong Baoying,Chen Yaqin,Song Yonggui,Zhou Rihui,Song Yonghai,Chen Shouhui
A novel porous spherical ZnO@carbon (C) nanocomposite based on zeolitic imidazolate frameworks (ZIFs-8)-directed method was prepared for lithium-ion batteries (LIBs). In this strategy, spherical ZnO nanoparticles were firstly prepared, then 2-methylimidazolate and Zn 2+ were added alternately under ultrasound to fabricate ZnO@ZIF-8. Finally, the novel porous spherical ZnO@C nanocomposites were obtained via pyrolyzing the corresponding ZnO@ZIF-8. The novel porous spherical ZnO@C nanocomposites were characterized with different analysis techniques such as scanning electron microscopy, transmission electron microscopy and X-ray powder diffraction. The resulted spherical ZnO@C nanocomposites exhibited a high reversible capacity of 932 mA h g −1 at 0.1 A g −1 after 100 cycles, which is much higher than that of the pure ZnO nanoparticles. The porous structure, high specific surface area and good electrical conductivity eventually contribute to the good performance of the resulted ZnO@C nanocomposites for LIBs should be ascribed to the proous structure and high BET surface area derived from ZIFs, as well as the good electrical conductivity of the amourphous carbon derived from ZIFs.
研究领域:
材料科学
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能源存储与转换
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高影响因子
JOURNAL OF BIOTECHNOLOGY
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2019
·
IF 3.163
Yuxiao Feng,Le Zhong,Ying hou,Shiru Jia,Jiandong Cui
Zeolitic imidazole frameworks (ZIFs) with tunable pore sizes and high surface areas have recently used as an effective support for immobilizing enzymes. However, the instability in the aqueous acidic environment has limited their practical applications in some cases. In this work, we develop a novel catalase/ZIFs composite with mesoporous silica shell (mSiO 2 @CAT/ZIFs) via co-precipitation, and controlled self-assembly of silanes. During preparation, the cetyltrimethylammonium bromide induced the formation of the mesostructured silica layer on the outer surface of CAT/ZIFs. The resultant mSiO 2 @CAT/ZIFs exhibited high activity recovery (92%). Compared with the conventional CAT/ZIFs and free CAT, mSiO 2 @CAT/ZIFs exhibited excellent acid resistance. For example, after 30 min in acetate buffer solution (pH 3.0), the CAT/ZIFs and free CAT almost lost activity whereas the mSiO 2 @CAT/ZIFs still retained 35% of original activity. Meanwhile, the thermostability of the mSiO 2 @CAT/ZIFs was enhanced significantly compared with conventional CAT/ZIFs. In addition, the mSiO 2 @CAT/ZIFs displayed excellent storage stability, and retained 60% of its initial activity after 15 days storage period. Furthermore, the mSiO 2 @CAT/ZIFs could maintain 70% of its initial activity after 8 continuous uses, demonstrating superior reusability than the free CAT and CAT/ZIFs. These results demonstrated that the mSiO 2 @CAT/ZIFs are potential for practical applications even in the acidic environment.
研究领域:
生物化学
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材料科学
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xiaoyue Li,Penghui Li,Yingjie Li,Haitang Liu,Zongzheng Yang,Yanyan Chen,Xiaoyuan Liao
In situ generation of H 2 O 2 by photocatalyst with sterilization is an environmentally friendly method. In this work, we prepared three kinds of Zn-based ZIFs materials, i.e., MAF-6, ZIF-11 and ZIF-71, and systematically investigated their application in the area of photocatalytic H 2 O 2 production, and antibacterial efficiency. It is found that MAF-6 had the best ability of generate H 2 O 2 (1005 μmol h -1 g -1 ), 1.6 times more than ZIF-11, while ZIF-71 produced almost no H 2 O 2 . The sterilization rate of MAF-6 against Staphylococcus aureus and Escherichia coli can reach 97% and 91% in 3 h, respectively. It is worth noting that the more photo-generated reactive oxygen species (∙OH and ∙O 2 - ) are produced, the better sterilization effect . This work provides new material and insights into photocatalytic sterilization by in situ H 2 O 2 generation.
研究领域:
环境科学
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材料科学
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微生物学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Zian Zhang,Ning Wang,Peng Wang,Kai Jin,Yang Yang,Chenhao Liu,Zhiqiang Yang,Pawin Iamprasertkun,Mingbo Wu,Han Hu
Dual-ZIF-derived strategy enables uniform dispersion of Co nanoparticles. • XAFS confirms coexistence of Co nanoparticles with Co–N 2 and Zn–N 4 single atoms. • Co NPs/Co, Zn-CNFs catalyst achieves Δ E of 0.726 V for ORR/OER. • Zinc-air battery with Co NPs/Co, Zn-CNFs delivers 980 h stable cycling at 10 mA·cm –2 . Cobalt nanoparticles (Co NPs) represent a class of efficient bifunctional electrocatalysts considered ideal for zinc-air battery (ZAB) cathodes. However, their high surface energy leads to severe agglomeration and operational instability, significantly limiting their practical utility. To overcome these limitations, rational support design is essential. This work presents a carbon nanofiber support modified with Co–N 2 and Zn–N 4 sites, enabling the in situ formation of uniformly dispersed and stable Co NPs. The material was synthesized by carbonizing electrospun ZIF-67-containing fibers coated with ZIF-8, which served as a self-sacrificing template. This process yielded highly dispersed Co NPs anchored on the dual-metal modified carbon matrix, effectively preventing NP coalescence. The optimized catalyst demonstrates exceptional bifunctional oxygen electrocatalytic performance, achieving a half-wave potential ( E 1/2 ) of 0.86 V for oxygen reduction reaction (ORR) and an overpotential of 356 mV at 10 mA·cm –2 for oxygen evolution reaction (OER). In practical applications, rechargeable ZABs incorporating this catalyst attained a peak power density of 191.6 mW·cm –2 , a specific capacity of 815.0 mAh·g –1 , and remarkable cycling stability exceeding 980 hours at 10 mA·cm –2 , substantially outperforming conventional Pt/C+RuO 2 catalysts. This work provides an effective and feasible strategy for developing high-performance, durable electrocatalysts for advanced energy conversion systems. Download: Download high-res image (247KB) Download: Download full-size image
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 42
·1903774
·
IF 15.621
Zhongliang Huang,Longlong Fan,Feigang Zhao,Bin Chen,Kaiji Xu,Shu-Feng Zhou,Jinli Zhang,Qingbiao Li,Dan Hua,Guowu Zhan
Hybrid metal oxides with multilayered structures exhibit unique physical and chemical properties, particularly important to heterogeneous catalysis. However, regulations of morphology, spatial location, and shell numbers of the hybrid metal oxides still remain a challenge. Herein, binary Co 3 O 4 /ZnO nanocages with multilayered structures (up to eight layers) are prepared via chemical transformation from diverse Matryoshka-type zeolitic imidazolate frameworks (ZIFs) via a straightforward and scalable calcination method. More importantly, the obtained ZIF-derived metal oxides (ZDMOs) with versatile layer numbers exhibit remarkable catalytic activity for both gas-phase CO oxidation and CO 2 hydrogenation reactions, which are directly related to the sophisticated shell numbers (i.e., Co 3 O 4 -terminated layers or ZnO-terminated layers). Particularly, in situ reflectance infrared Fourier transform spectroscopy (DRIFTS) results indicate that the promotional effects of the multilayered structures indeed exist in CO 2 hydrogenation, wherein the key reaction intermediates are quite different for five-layer and six-layer ZDMOs. For instance, *HCOO is the predominant intermediate over the six-layer ZDMO; on the contrary, *H 3 CO is the crucial species over the five-layer ZDMO. The ZnO/Co 3 O 4 interface should be the active sites for CO 2 hydrogenation to *HCOO and *H 3 CO species, which are ultimately converted to the products (CH 4 or methanol). Accordingly, the work here provides a convenient way to facilely engineer multilayered Co 3 O 4 /ZnO nanocomposites with precisely controlled shell numbers for heterogeneous catalysis applications.
研究领域:
材料科学
·
催化化学
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高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Dejun Xu,Xinning Yu,Xintong Jiang,Jun Zhang,Zhangsong Ni,Mao Wang
Sodalite-topology zeolitic imidazolate framework-8 (ZIF-8) composed of Zn 2+ ions and organic linkers exhibit excellent physical and chemical properties such as high porosity, large surface area and abundant active sites. While it can only be excited by UV light due to the wide bandgap energy, which limits its application in photocatalysis. Herein, we report a systematic research on the synthesis of Co-doped ZIF-8 and its promotion effects on the photocatalytic performance. The as-synthesized Co x Zn 1- x -ZIF possessed homogeneous dodecahedron crystals and developed porous structure, together with obvious light absorption in visible frequency range. The photocatalytic performance of methylene blue (MB) had been improved with increasing of Co 2+ /Zn 2+ ratio in ZIFs, while the reaction stability of Co 0.75 Zn 0.25 -ZIF and Co 1.0 -ZIF significantly decreased due to the apparent collapse in crystal phase. Taken together, Co 0.5 Zn 0.5 -ZIF was demonstrated to be a remarkable photocatalyst with high photocatalytic activity and strong stability. The photogenerated ·O 2 − and ·OH radicals were found to react as main oxygen species in photocatalytic reaction.
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高影响因子
Chemical Engineering and Processing-Process Intensification
·
2023
·
IF 4.3
Qiang Liu,Jia-Ni Zhang,Ting-Liang Xie,Shi-Xiao Wei,Hao-Tian Tong,Shuang-Feng Yin
The average size and particle size distribution (PSD) of zeolitic imidazolate frameworks (ZIFs) (such as ZIF-8, ZIF-67) are closely related to their physical and chemical properties. However, it is difficult to prepare small ZIFs with narrow PSD in traditional batch reactors owing to poor mixing efficiency. Here, a four-stage oscillating feedback microreactor (FOFM) was developed to prepare ZIFs by microemulsion method. CFD simulations and visualization experiments were conducted to investigate liquid-liquid two-phase flow patterns involved, demonstrating that chaotic advection can be effectively produced, thus dispersed phase is broken up into small droplets and homogeneous microemulsions are obtained. The proposed microemulsion method based on FOFM enables preparation of ZIF-8 with small average size (38.2 nm) and narrow PSD ( σ g = 1.24) without surfactant at a flow rate of 90 mL/min.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jingqiu Li,Yi Feng,Lvye Yang,Jianfeng Yao
Metal ion-induced etching can effectively convert zeolitic imidazolate frameworks (ZIFs) to CoNi-layered double hydroxides (LDH). Here, different metal-ion-assisted etching methods are utilized to convert Co-ZIF-L to CoNi-LDH with various morphologies and electrochemical properties . The resultant CoNi-LDH (CoNi-1) with a composition of Co 0.7 Ni 0.3 (OH) 2 displayed a high electrochemical performance when Co-ZIF-L was treated in N, N -dimethylformamide-ethanol solution containing Co 2+ ions followed by Ni 2+ ion-induced etching under hydrothermal condition. The improved electrochemical performance of CoNi-1 can be attributed to structural advantages, where the well-dispersed ultrathin CoNi-LDH layers favor the exposure of surface active sites and promote ion diffusion to maximize electrochemical properties.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）