INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2014
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IF 2.235
Lu Lin,Tong Zhang,Xiongfu Zhang,Haiou Liu,King Lun Yeung,Jieshan Qiu
In this work, we fabricated a new type of Pd/SiO2@ZIF-8 core–shell catalyst composed of a Pd/SiO2 microsphere as the core and a ZIF-8 membrane as the shell. The preparation procedure involves first loading Pd nanoparticles onto nonporous SiO2 microspheres to obtain the Pd/SiO2 core and then coating a perfect layer of ZIF-8 shell on the core by electrostatic induction to form a Pd/SiO2@ZIF-8 core–shell structure. It is crucial that the modification of the Pd/SiO2 core with polyelectrolyte was employed to improve the charge distribution of the core surface and preferably adsorb Zn2+ cations in the synthesis solution so as to assist the formation of a continuous ZIF-8 shell. The compactness and thickness of the shell were optimized by increasing the number of cycles of ZIF-8 growth. The hydrogenations of alkenes with different molecular sizes showed that the Pd/SiO2@ZIF-8 catalysts can provide excellent product selectivity and antipoisoning and antileaching properties for the hydrogenations of alkenes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Lu Lin,Haiou Liu,Xiongfu Zhang
MOFs-based yolk-shell composites are newly-presented but promising catalysts in the area of catalysis. In this work, a kind of unique rattle-type Pd/ZnO@hollow ZIF-8 yolk-shell catalyst is developed via a ZnO-template approach, in which there exist two processes of both ZnO-induced ZIF-8 formation and ZnO dissolution. Of prime importance is that ZnO was selected as the sacrificial template since it can not only be etched in the solution of ligands but also assist the formation of compact ZIF-8 shell by providing nucleation sites via linker activation. It is also proposed that sufficient amount of Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole added in the growth solution of ZIF-8 should accelerate the outward growth of ZIF-8 layer as well as dissolution of ZnO. This way, the final construction of Pd/ZnO@hollow ZIF-8 yolk-shell materials is achieved. Compared to the Pd/ZnO counterparts, Pd/ZnO@hollow ZIF-8 rattle-type catalysts demonstrate a promoted behavior in terms of size-selectivity for the liquid hydrogenations of alkenes due to the outer ZIF-8 shell acting as a molecular sieve. It can also protect the catalytically active Pd NPs from poisoning and leaching, giving rise to an excellent stability. Moreover, the yolk-shell catalysts manifest a better activity beyond their core-shell counterparts since the presented interior hollow space between core and shell is likely to expose more active surfaces to reactants.
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RSC Advances
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2017
·Vol. 7
·期 50
·31365-31371
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IF 3.108
Rong-Mei Kong,Yan Zhao,Yiqun Zheng,Fengli Qu
Zeolitic imidazolate frameworks (ZIF) are attracting considerable attention for their applications in adsorbents/separation as well as catalysis. In this article, we proposed a simple strategy to fabricate semiconductor–ZIF core–shell nanocomposites, which exhibited remarkable coherent function for adsorption and photocatalytic degradation of organic pollutants. The current nanocomposites were composed of ZnO/CdS and ZIF-8, where spindle-like ZnO nanoparticles not only acted as the seeding material but also worked as the Zn2+ source for the formation of ZIF-8. The as-prepared ZnO/CdS@ZIF-8 core–shell nanocomposites displayed distinct photocatalytic activity for methylene blue (MB) and rhodamine B (RhB) owing to the unique pore structure and thus absorption effect of the ZIF-8 shell. To this end, the ZnO/CdS@ZIF-8 core–shell nanocomposites could find important applications in photocatalytic degradation of pollutants.
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Surfaces and Interfaces
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2024
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IF 5.7
Xuejiao Wang,Jiayi Dai,Xupeng Zhu,Xueyan Liu,Yufeng Tao,Erjin Zhang,Xudong Ren
The presence of hazardous substance in river water poses a severe threat to both the ecological environment and human health. Therefore, designing and preparing highly sensitive SERS platform for monitoring the hazardous substance is of great significance. Herein, the Ag nanoflowers (NFs)@ZIF-8 core-shell nanocomposite was synthesized and utilized as SERS substrate. Using crystal violet as model molecule, this substrate achieved a detection limit of 10 −10 M and superior uniformity with relative standard deviation of less than 15 %, and the enhancement factor (EF) for crystal violet was calculated about 4.37×10 6 . Besides, the SERS signal only showed a slight attenuation after 3 months storage. As a demonstration, the SERS platform achieved sensitive detection of two hazardous substances thiram and methylene blue with detection limits of 10 −7 M and 10 −8 M. And the recoveries of SERS detection for thiram and methylene blue in river water were between 70 % and 182 %. The electromagnetic enhancement provided by Ag NFs and the enriching effect of ZIF-8 shell collectively contribute to the excellent performance of the Ag NFs@ZIF-8 SERS platform. This work delivers a promising strategy for constructing hybrid SERS platform for highly sensitive detection.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Jufen Yan,Lu Dai,Pei Wang,Yongsheng He,Qi Wang,Yiliang Chen,Haowei Zhang,Abdallah S. Ali,Rasha H. Ahmed,Ivana Radojcic Redovnikovic,Kui Zhang,Hongliang Wang,Xinya Han
The development of multifunctional materials capable of serving both as high-efficiency adsorbents and high-performance supercapacitors is a critical challenge for environmental and energy applications. In this study, a novel zeolitic imidazole framework-8/mycelial pellet (ZIF-8/MP) composite was successfully synthesized using a simple in-situ growth and staged adsorption process. The MP with its three-dimensional porous structure, served as a scaffold, facilitating the uniform distribution of ZIF-8 across the porous carbon matrix. The resulting ZIF-8 in the ZIF-8/MP composite demonstrated a remarkable adsorption capacity for Congo red (CR), with a maximum capacity of 1428.57 mg/g. The adsorption mechanism was attributed to electrostatic interactions, zinc coordination, hydrogen bonding, and π–π conjugation, as confirmed by FTIR, XPS, and DFT analyses. After adsorption, the carbonized ZIF-8/MP composite demonstrated outstanding supercapacitor performance, achieving a specific capacitance of 113.4 F/g at 1 A/g, and maintaining 93 % capacitance retention after 5000 charge/discharge cycles. Additionally, the ZIF-8/MP composite effectively reduced the toxicity of CR, as demonstrated by phytotoxicity assays, underscoring its potential for environmental remediation. This innovative approach provides an eco-friendly, easily separable, efficient, and practical multifunctional material for transforming hazardous waste into valuable resources for environmental detoxification and energy storage applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Jiayan Zhu,Lin Zhang,Zongjian Liu,Wenxia Zhai,Zhengfei Ma,Qun Cui,Haiyan Wang
The separation of mono- and di-branched C6 alkane isomers is one of the most challenging industrial processes for the production of high-octane gasoline components. In this work, ZIF-8 with dual ligands of imidazole (IM) and 2-methylimidazole (2-MIM), named as DLA-ZIF-8-IM, was synthesized by the method of delayed linker addition, and the microstructure of DLA-ZIF-8-IM was analyzed. Adsorption thermodynamic, kinetic and separation properties of C6 alkane isomers were investigated. The results show that compared with SALE-ZIF-8-IM prepared by the solvent-assisted ligand exchange method, the synthesis method of DLA-ZIF-8-IM is simpler and the BET specific surface area and pore volume (2136 m 2 ·g −1 and 0.72 cm 3 ·g −1 ) of DLA-ZIF-8-IM are increased by 21 % and 14 %, which is more conducive to adsorption and diffusion of 3-methylpentane (3MP) on DLA-ZIF-8-IM. The equilibrium adsorption capacity of 3MP on DLA-ZIF-8-IM reaches up to 2.89 mmol·g −1 , which is 1.1 times than that on SALE-ZIF-8-IM, and the ratio of diffusion time constants between 3MP and 2,3-dimethylbutane (23DMB) on DLA-ZIF-8-IM (5.13) is 2.2 times than that on SALE-ZIF-8-IM. Moreover, at 30℃, the breakthrough adsorption capacity of 3MP on DLA-ZIF-8-IM is 1.46 mmol·g −1 , which is 1.6 times more than that of SALE-ZIF-8-IM (0.90 mmol·g −1 ), while the breakthrough adsorption capacity of 23DMB is basically the same. The separation factor between 3MP and 23DMB on DLA-ZIF-8-IM is 2.96 via the synergy of thermodynamic and kinetic mechanism and the dynamic adsorption capacity of 3MP reaches 1.46 mmol·g −1 . DLA-ZIF-8-IM achieves complete separation of C6 alkane mixtures for obtaining single high-purity product. This work provides a novel synthesis strategy for developing C6 alkane (clear) adsorption separation materials by modulating microporous structures of dual-ligand MOFs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yashi Wang,Zhaoguo Wu,Junwei Yang,Aiwu Zhao,Jin Wang
In order to efficiently keep activities of enzymes and enhance stabilities of enzymes, intercalation of enzymes into core of Au nanorod and MOFs shell has been designed. Vice versa, enzymes immobilized on the surface of Au nanorod can guide MOFs shell growth via biomineralization interplay accompany with surfactant directed growth of MOFs on an anisotropic plasmonic template, leading to formation of a porous layer-by-layer nanostructure. Due to incorporation of stimuli-responsive enzyme and MOFs skeleton, loaded anticancer drug can be efficiently released under endogenous stimuli. In-situ SERS and UV-Vis analysis indicate that porous Au nanorod@enzymes@ZIF-8 nanocomposites can perform superior drug releasing behavior compared to Au nanorod@ZIF-8. Hence, the porous Au nanorod@enzymes@ZIF-8 nanocomposites can give more efficient enzymatic biocascade reaction in the nanoreactor in contrast with Au nanorod@ZIF-8@enzymes. Based on porous characteristics of ZIF-8 shell in the Au nanorod@enzymes@ZIF-8 nanocomposites, the nanocomposites can cause complete apoptosis of HeLa cell via enzymatic biocascade reaction and loaded anticancer drug. It can be expected that the unique biological-inorganic-organic hybridized nanosystem would be extensively applied in quantitative evaluation of multi-modal tumor therapy.
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Materials Today Chemistry
·
2025
·
IF 6.7
Huaiyin Chen,Zhonghe Wang,Jun Li,Xiaolin Liu,Congxiang Li,Yongzhao Li,Weihe Yu,Longmin Liu,Yi Zhang,Yuekun Lai,Weilong Cai
ZIF-8 is considered as a promising functional material in anti-corrosion coating applications. However, ZIF-8 hydrolyzes easily, especially in acidic and salty media, due to its unstable Zn–N coordination bonding and hydrophilic crystal surface, which reduces anti-corrosion durability of the coatings. In this study, highly hydrophobic modification of ZIF-8 particles was performed through simple surface ligand exchange with 5,6-dimethylbenzimidazole (DMBIM). The as-prepared ZIF-8/DMBIM particles showed high water-repellency and enhanced chemical stability in acidic, neutral, and alkaline media, and excellent compatibility and barrier function in epoxy coatings. As a consequence, ZIF-8/DMBIM modified epoxy coatings showed significantly enhanced corrosion resistances in acid, alkali and salt aqueous solutions with pH 3.0–11.0. Electrochemical impedance spectroscopy tests demonstrated that, after 20 days of immersion in 3.5 wt% NaCl solution at all the studied pH, the |Z| 0.01 Hz values of ZIF-8/DMBIM modified epoxy coatings were approximately two orders of magnitude higher than of the original epoxy coatings. This work provides an idea for the development and application of ZIF materials in more fields, and innovative anti-corrosion coatings based on functional modification of materials.
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MOLECULES
·
2024
·Vol. 29
·期 24
·6011
·
IF 4.2
Ting Zhou,Luyao Zang,Xia Zhang,Xia Liu,Zijie Qu,Guodong Zhang,Xiufeng Wang,Fang Wang,Zhiqing Zhang
Gold nanoclusters (AuNCs) have been widely investigated because of their unique photoluminescence properties. However, the applications of AuNCs are limited by their poor stability and relatively low fluorescence. In the present work, we developed nanocomposites (L-Cys-AuNCs@ZIF-8) with high fluorescence and stability, which were constructed by encapsulating the water-dispersible L-Cys-AuNCs into a ZIF-8 via Zn2+-triggered growth strategy without high temperature and pressure. The maximum emission wavelength of the L-Cys-AuNCs@ZIF-8 composite was at 868 nm, and the fluorescence intensity of L-Cys-AuNCs@ZIF-8 was nearly nine-fold compared with L-Cys-AuNCs without the ZIF-8 package. The mechanism investigation by fluorescence spectroscopy and X-ray photoelectron spectroscopy showed that L-Cys-AuNCs@ZIF-8 impeded ligand rotation, induced energy dissipation, and diminished the self-quenching effect, attributing to the spatial distribution of L-Cys-AuNCs. Based on the high fluorescence efficiency of L-Cys-AuNCs@ZIF-8, a “signal off” detective platform was proposed with copper ions as a model analyte, achieving a sensitive detection limit of Cu2+at 16.7 nM. The quenching mechanism was confirmed, showing that the structure of the L-Cys-AuNCs@ZIF-8 nanocomposites was collapsed by the addition of Cu2+. Attributing to the strong adsorption ability between copper ions and pyridyl nitrogen, the as-prepared L-Cys-AuNCs@ZIF-8 was shown to accumulate Cu2+, and the Zn2+in ZIF-8 was replaced by Cu2+.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shuqin Zhang,Jieni Wang,Chenlin Wei,Peiliang Liu,Shumeng Qin,Leichang Cao,Yanmei Zhou,Jinglai Zhang,Shicheng Zhang
Global warming and the increasing frequency of extreme weather caused by the gradual increase in CO 2 concentration in the atmosphere are urgent issues that must be addressed. In this study, ZIF-8-derived in-situ nitrogen-doped porous carbon materials were prepared through one-step pyrolysis of ZIF-8. The synthesis was gradually optimized by exploring different pyrolysis temperatures to determine the optimal ZIF-8-derived porous carbon for CO 2 adsorption. The CO 2 -adsorption capacity of ZIF-8–800 reached 5.22 and 6.19 mmol g −1 at 25 ℃ and 0 ℃ (1 bar), respectively. After five cycles, its CO 2 -adsorption capacity decreased by only about 1.7 %. Moreover, the CO 2 /N 2 selectivity at 1 bar was as high as 21.2 (48.9 at 0.05 bar), and the isothermal adsorption heat was also within a moderate range (31 kJ mol −1 ). The superior CO 2 adsorption performance was found to originate from the comprehensive effect of the three-dimensional pore structure that combined reasonably coordinated micropores, mesopores, and macropores, as well as some specific favorable N/O groups. The results indicate the broad application prospects of ZIF-8-Ts in CO 2 capture and separation and provide new ideas for the sustainable application of novel MOF-derived porous carbon materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lianzhong Shen,Lin Wang,Yu Ye,Zhouwei Li,Qizhou Dai
The fabrication of various defects on the surface of metal single-atom catalysts can improve their electrochemical CO 2 reduction reaction (CO 2 RR) ability, and the current mainstream research focuses on the defect modification of heteroatom doping, while there are fewer studies on intrinsic defects on carbon substrates. Herein, a series of catalysts with both Fe-N 4 sites and intrinsic defects were synthesized on the ZIF-8 surface by pyrolytic etching at a suitable temperature under ammonia atmosphere. Electrochemical tests in an H-cell showed that the catalyst achieved CO Faradaic efficiency (FE CO ) of 96.9 % and CO partial current density (J CO ) of 9.088 mA cm −2 at −0.6 V. Through further studies, we introduced a “585” ring structure to describe these intrinsic defects and found that these intrinsic defects on the carbon-based surface can act as active sites to promote CO 2 RR along with the Fe-N 4 sites. This work provides a reference for the study of intrinsic defect-modified single atomic materials.
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TALANTA
·
2024
·
IF 5.6
Jiayue Sun,Lei Ji,Yan Li,Xiyue Cao,Xiuling Shao,Jianfei Xia,Zonghua Wang
In this research, self-screening aptamer and MOFs-derived nanomaterial have been combined to construct electrochemical aptasensor for environmental detection. By utilizing the large specific surface area of reduced graphene oxide (rGO), ZIF-8 was grown in situ on surface of rGO, and the composites was pyrolyzed to obtain MOFs-derived porous carbon materials (rGO-NCZIF). Thanks to the synergistic effect between rGO and NCZIF, the complex exhibits remarkable characteristics, including a high electron transfer rate and electrocatalytic activity . In addition, the orderly arrangement of imidazole ligands within ZIF-8 facilitated the uniform doping of nitrogen elements into the porous carbon, thereby significantly enhancing its electrochemical performance . After carboxylation , rGO-NCZIF was functionalized with self-screening aptamer for fabricating electrochemical aptasensor, which can be used to detect Erwinia cypripedii , a kind of quarantine plant bacteria, with detection limit of 4.92 × 10 3 cfu/mL. Due to the simplicity and speed, the aptasensor is suitable for rapid customs inspection and quarantine. Additionally, the universality of this sensing strategy was verified through exosomes detection by changing the aptamer. The results indicated that the rGO-NCZIF-based electrochemical aptasensor had practical value in the environmental and medical fields.
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