EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2019
·Vol. 2019
·期 46
·4920-4926
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IF 2.578
Kaixuan Zhao,Jinxin Guo,Huiying Wei,Yanzhao Yang
Graphical A new coordination method for the preparation of hollow bimetallic oxides is proposed. The unsaturated ligands of ZIF-67 were combined with the second metal ions by ultrasound, and then calcined to form a hollow bimetallic hollow nanoboxes. This method can be applied to Cu II , Fe III , Ni II and other metal ions. Bimetallic hollow nanomaterials which are composed of two different metal/metal oxide materials show great potentials owing to their unique structural features. Here, the second metal ions were introduced into the surface of ZIF-67 by ultrasonication to form bimetallic hollow complexes, and the coordination between the second metal ions and ZIF-67 colloidal crystals are further investigated. A series of bimetallic complexes has been synthesized by incorporating Fe III , Cu II and Ni II into the coordinating block of ZIF-67. After calcination in oxygen, these as-prepared transformed to Fe/Cu/Ni doped Co 3 O 4 hollow nanoboxes. We found a facile and general method to form bimetallic complexes by complexing the second metal ions with ZIF-67 surface ligands and calcining to form bimetallic hollow nanoboxes.
研究领域:
材料科学
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化学工程
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高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 74
·期 6
·1839-1847
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IF 1.246
Liu Li,Hao Yan-jun,Li Zhen,Chen Cheng,Wu Ming-yu,Feng Shun
Abstract One gold nanoparticles (NPs) modified zeolitic imidazolate framework material was prepared from cobalt(II) oxide (Au@ZIF-67). The morphology, elemental composition and colorimetric property of it was characterized by UV–Vis spectrophotometer, field-emission scanning electron microscope, transmission electron microscope and energy-dispersive spectroscopy. In presence of 20 amino acids making up proteins, the feature absorbance of Au@ZIF-67 solution at 592 nm decreased accordingly only in presence of cysteine (Cys) and kept almost no change whenever added other 19 amino along or mixed together. Therefore, either naked eye and visible spectrometric methods were proposed for Cys detection with detection limits of 0.5 µM and 0.1 µM, respectively. The distinguished color change, short reaction time, high specificity and sensitivity made Au@ZIF-67 a promising visible colorimetric probe for Cys in water. Moreover, the potential mechanism was studied. The result indicated that Au NPs played as a key role. Graphic abstract
研究领域:
材料科学
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分析化学
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生物医学
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 36
·15839-15845
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IF 2.7
Tao Wang,Mengyao Shi,Changyan Guo,Jide Wang
ZIF-67 has garnered much attention in the field of photocatalytic water splitting due to the advantages of MOFs and zeolite sieves. However, post-modification and composite strategies have emerged as effective approaches to enhance its photocatalytic performance, particularly in enabling bi-functionality for oxidation-coupled reduction reactions. In this study, 2-mercaptobenzimidazole (MBI) modified ZIF-67 and cadmium sulfide (CdS) composites were prepared to investigate their application in photocatalytic oxidation-coupled hydrogen evolution reactions. The results demonstrated an enhancement in hydrogen production performance over CdS@ZIF-67-MBI, with an increase from 2.39 mmol g−1 h−1 to 4.49 mmol g−1 h−1 upon the introduction of MBI. Moreover, the conversion efficiency of benzyl alcohol reached an improved value of 58.5%. The study findings revealed that the heterogeneous coupling between ZIF-67 and CdS, along with the effective charge transfer facilitated by the anion S, played a decisive role in promoting charge–hole separation of composite materials and improving carrier transport efficiency. This demonstrates the viability of utilizing ZIF-67 in a bifunctional photocatalytic reaction system, thereby paving the way for broader applications of ZIF-67.
研究领域:
材料科学
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化学工程
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环境科学
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Fangxu Dai,Mingming Zhang,Qian Chen,Mingzhong Mi,Zhenjiang Li,Jishu Han,Jun Xing,Shouhua Feng,Lei Wang
Developing highly efficient and low-cost photocatalysts for CO 2 reduction is of critical importance for the conversion of CO 2 to value-added chemicals. Here we report a Co-based zeolitic imidazole framework (ZIF-67) based photocatalyst with exceptional photocatalytic activity and durability for CO 2 reduction. ZIF-67 is doped with dicyandiamide (DCD), the intermediate link with the trace Ru cocatalyst (0.0127 wt. %). The underlying reduction mechanism was unraveled by the joint experiment-theory study. The strong orbital coupling of ZIF-67-DCD-Ru series structure leads to strong CO 2 adsorption, electron enrichment on cocatalyst, and minimum Gibbs free energy barrier of CO generation. The synthesized ZIF-67/DCD/Ru sample exhibits excellent CO 2 photoreduction performance with a CO generation rate of 1495 mmol g Ru −1 h −1 and achieves a record turnover frequency (TOF) of 151 h −1 , representing top-level photocatalytic activity among all reported ZIFs-based photocatalysts. For the first time, our work points out a novel way to achieve high activity of ultralow noble metal loading photocatalyst and provides an in-depth understanding of the advances of the series structure.
研究领域:
材料科学
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化学工程
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环境科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Caijiao Yu,Yueyao Liang,Wenjuan Xue,Zhengqing Zhang,Xuemeng Jia,Hongliang Huang,Zhihua Qiao,Donghai Mei,Chongli Zhong
Metal-organic framework (MOF) membranes have significant potential for use in efficient gas separation. However, fabricating polymer substrate-supported ultra-thin MOF membranes with no defects remains a challenge. Herein, we proposed an in situ interface self-repair strategy for fabricating ultra-thin and defect-free ZIF-67 membranes for the first time. This was realized by preparing a polyvinyl alcohol (PVA)-Co 2+ interfacial layer containing a Co 2+ ion layer and a PVA-Co 2+ complex layer. The PVA-Co 2+ interfacial layer released Co 2+ ions and acted as a metal source to form ZIF-67 membranes by reducing the coordination rate of Co 2+ ions with 2-methylimidazole. The embedded Co 2+ ions functioned as anchor sites for the nucleation of ZIF-67 membrane assisted by the interface-enhanced deprotonation of 2-methylimidazole. Especially, the slow release of Co 2+ ions from the PVA-Co 2+ interfacial layer facilitated self-repair of defects to form a continuous and dense MOF layer. ZIF-67 membranes, 80-280 nm thick, were successfully synthesized and demonstrated unprecedented CO 2 permeance and good CO 2 /N 2 selectivity. This work provides a promising strategy for the fabrication of ultra-thin and defect-free MOF membranes on polymeric support layers for use in practical applications.
研究领域:
材料科学
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化学工程
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高影响因子
ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Lili Xiao,Qing Zhao,Lin Jia,Qi Chen,Jin Jiang,Qiyu Yu
Nickel-based nanoparticles have been widely used in detection of glucose due to its multiple oxidation states and high stability in alkaline environment. In this work, amorphous nickel phosphate was supported by Co-based zeolitic imidazolate framework (ZIF-67) through ion exchange to prepare Ni 3 (PO 4 ) 2 @ZIF-67 composites as the electrode material . In comparison to glassy carbon electrode (GCE), Ni 3 (PO 4 ) 2 /GCE and ZIF-67/GCE, the Ni 3 (PO 4 ) 2 @ZIF-67/GCE showed significantly enhanced performances in electrocatalytic oxidation of glucose. The great improvement on glucose oxidation current could be ascribed to the unique structure of Ni 3 (PO 4 ) 2 @ZIF-67, the mutual promotion between Ni(III)/Ni(II) and Co(IV)/Co(III) interfacial redox reactions and increased surface areas. Under optimum conditions, as-prepared Ni 3 (PO 4 ) 2 @ZIF-67/GCE showed an ultra-high sensitivity of 2783 μA mM −1 cm −2 with a wide linear ranged from 1.0 μM to 4.0 mM, and a low limit detection of 0.7 μM at a signal-to-noise ratio of 3. Moreover, Ni 3 (PO 4 ) 2 @ZIF-67/GCE were successfully applied to detect glucose of human serum with good recoveries (92–109%), which indicated that Ni 3 (PO 4 ) 2 @ZIF-67 can found application in the clinical detection.
研究领域:
材料科学
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生物医学工程
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1571
·
IF 5.719
Hao Gong,Shiguang Bie,Jian Zhang,Xianbin Ke,Xiaoxing Wang,Jianquan Liang,Nian Wu,Qichang Zhang,Chuanxian Luo,Yanmin Jia
The Co3O4electrode is a very promising material owing to its ultrahigh capacitance. Nevertheless, the electrochemical performance of Co3O4-based supercapacitors is practically confined by the limited active sites and poor conductivity of Co3O4. Herein, we provide a facile synthetic strategy of tightly anchoring Co3O4nanosheets to a carbon fiber conductive cloth (Co3O4@C) using the zeolitic imidazolate framework-67 (ZIF-67) sacrificial template via in situ impregnation and the pyrolysis method. Benefiting from the enhancement of conductivity and the increase in active sites, the binder-free porous Co3O4@C supercapacitor electrodes possess typical pseudocapacitance characteristics, with an acceptable specific capacitance of ~251 F/g at 1 A/g and long-term cycling stability (90% after cycling 5000 times at 3 A/g). Moreover, the asymmetric and flexible supercapacitor composed of Co3O4@C and activated carbon is further assembled, and it can drive the red LED for 6 min.Keywords:ZIF-67;Co3O4nanosheet;in situ growth;Co3O4@C;supercapacitor
研究领域:
材料科学
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能源存储
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PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2021
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IF 0.782
Jianning Li,Chunyong Zhang,Yingpin Wen,Yuyue Zhao,Yiwen Zhang,Li Shu,Hengfei Qin
Binary transition metal oxides exhibit improved properties including good redox potentials and electrical conductivities compared with single metal oxides as electrode materials in energy storage. Herein, ZIF-67 is prepared by a one-step method using Co2+ as the central metal ion, 2-methylimidazole as the organic ligand, and methanol as an organic solvent at room temperature. Hollow NiCo2O4 and sheet-like Co3O4/NiCo2O4 derived from bimetallic imidazolate framework precursors were synthesized by adding cobalt and nickel ions in appropriate proportions. A hollow and porous structure is achieved for the reaction between a nickel salt and ZIF-67, and this unique nanostructure provides a high active surface area, which is beneficial to the electrochemical properties. Several samples are prepared and used as electrode materials for electrochemical tests in 6 M KOH. As a result, the Co3O4/NiCo2O4 electrode with a sheet nanostructure showed a high specific capacitance of 846 F g−1 at a current density of 0.5 A g−1. This Co3O4/NiCo2O4 electrode material is promising for future studies on high-performance supercapacitors to solve emerging energy-related problems.
研究领域:
材料科学
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能源存储
·
电化学
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2015
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IF 2.133
Xiangli Guo,Tiantian Xing,Yongbing Lou,Jinxi Chen
Zeolitic imidazolate frameworks ZIF-67 were prepared under hydrothermal (120 °C) and non-hydrothermal (room temperature) from various cobalt sources and 2-methylimidazolate (Hmim) in aqueous solution within 30 min. The particle size and morphology were found to be related to the reactivity of the cobalt salt , Hmim/Co 2+ molar ratios and experimental condition. Using Co(NO 3 ) 2 as cobalt source, small-sized ZIF-67 crystals with agglomeration were formed. For CoCl 2 , small-sized rhombic dodecahedron were obtained. While large-sized crystals of rhombic dodecahedron structure were obtained from CoSO 4 and Co(OAc) 2 . Under hydrothermal condition, the size of ZIF-67 crystals tended to be more uniform and the morphology were more regular comparing to non-hydrothermal condition. This study provides a simple way to control the size and morphology of ZIF-67 crystals prepared in aqueous solution.
研究领域:
材料科学
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化学工程
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Xuemei Ma,Yali Gao,Wanyu Pang,Xile Chang,Zhiyong Hu,Tuoping Hu
The design of efficient electrocatalysts for the determination of chlorogenic acids (CGA) is crucial in the biological and medical fields. In this paper, ZIF-67/poly(3,4-ethylenedioxythiophene) (PEDOT) nanocomposites were synthesised. The introduction of PEDOT increased the electrical conductivity of the ZIF-67/PEDOT composites, inhibited the Co atom agglomeration, led to the exposure of more active sites and increased the transport channels. An ultrasensitive CGA sensor based on ZIF-67/PEDOT nanocomposite modified carbon paper (CP) electrode was developed. The nanomaterials were characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to study the electrochemical properties of the modified CP electrode. In addition, the effects of different experimental conditions such as pH, scan rate and concentration on the peak current of CGA were investigated. Under the optimised conditions, the linear range of ZIF-67/PEDOT/CP for the determination of CGA was 0.1 ∼ 40 μM, and the limit of detection (LOD) was as low as 0.003 μM (S/N = 3). Furthermore, the sensor was successfully used for the quantitative analysis of CGA in real samples.
研究领域:
生物医学
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分析化学
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材料科学
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 12
·1-12
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IF 1.551
Zhang Zhan-hang,Zhang Jing-li,Liu Jian-ming,Xiong Zhen-hu,Chen Xu
Zeolitic imidazole frameworks (ZIFs), a new adsorbent with a high chemical and thermal stability and a high adsorption capacity, are used for adsorptive removal of azo dyes. The synthesized ZIF-67 was characterized with Fourier transform infrared spectroscopy (FTIR), thermogravimetric–differential thermal analysis (TG–DTA) and zeta potential instrument. The adsorption of some azo dyes on ZIF-67 in the single dye systems showed that the removal efficiencies are congo red > methyl orange > methyl red > methyl blue. The highest adsorption capacity of congo red and methyl orange were 3900 and 1340 mg/g, respectively. In a binary dye system the adsorption capacity of congo red decreased, while the removal efficiency of methyl orange increased in comparison with the single systems, indicating that a competitive adsorption of congo red and methyl orange over the ZIF-67 occurred. The experimental data indicate that the electrostatic attraction between ZIF-67 and congo red is the major driving force and the π – π stacking is also responsible for dye adsorption. After 5 cycles of ZIF-67 adsorption and desorption, the congo red removal efficiency maintained more than 95%.
The adsorption of Congo red and Methyl orange on the ZIF-67
研究领域:
环境科学
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材料科学
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高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Shan Xu,Peifang Chen,Xichi Lin,Imran Mahmood Khan,Xiaoyuan Ma,Zhouping Wang
Histamine is a significant biomarker to assess the freshness of fish products. In this study, a novel MOF-based SERS sensor for histamine determination was synthesized by wrapping PVP-capped Au nanoflowers with a ZIF-67 shell (Au [email protected] ). The highly branched Au NFs core exhibited a strong electromagnetic field enhancement effect and provided an ultra-sensitive SERS fingerprint spectrum, while ZIF-67 shell was the contributor to enrich the target and stabilize the substrate. The morphology of the core-shell structures can be easily controlled by the concentrations of the capping agent PVP and MOF precursor Co ion . Consequently, 4-MBA pre-grafted on the optimized SERS substrate can act as the Raman internal standard (IS) to eliminate signal fluctuations through standardizing all spectra against its peak at 1074 cm −1 . Moreover, as the specific receptor for histamine molecules, 4-MBA helped reach the low detection sensitivity, where the SERS intensity ratio, I 1172 /I 1074 presented a good linear relationship towards the histamine concentrations (10 −3 -10 −7 M) with the LOD of 0.87 × 10 −7 M (R 2 = 0.9930). Furthermore, the application in monitoring fish spoilage process demonstrated the feasibility and reliability of the developed sensor. This work provided a facile strategy to construct MOF-based SERS substrate as a potential platform for the shelf-life prediction of fish products.
研究领域:
材料科学
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分析化学
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食品科学
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PubMed
高影响因子
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