Analytical Methods
·
2023
·Vol. 15
·期 41
·5483-5491
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IF 3.1
Shengyu Cao,Shanshan Huang,Chudi Yang,Lili Lian,Minhong Ren,Dazhi Sun
Phenoxy carboxylic acid (PCA) herbicides are commonly used herbicides that can easily accumulate in soil, groundwater, crops, and vegetable surfaces. Thus, they pose a serious risk to human health. Accurate detection of trace amounts of PCAs in various matrixes is crucial. Herein, ZIF-67-modified magnetic nanoparticles (MNPs, ZIF-67@Fe3O4) were prepared by growing ZIF-67 on the surface of Fe3O4 MNPs. The introduction of ZIF-67 improved the dispersion of Fe3O4 nanoparticles in water and enhanced their extraction performance for PCAs. When an eluent consisting of ammonia water and acetonitrile (5% : 95%; v/v) was employed, 10 mg of ZIF-67@Fe3O4 displayed optimal extraction performance for PCAs in a 20 mL sample solution at a pH of 3. We achieved a limit of detection ranging from 0.014 μg L−1 to 0.056 μg L−1 for four types of PCA herbicides by using the newly developed method. Notably, the values were considerably lower than the maximum concentration levels of PCAs in drinking water set by the Environmental Protection Agency. The relative recovery rate of PCAs using ZIF-67@Fe3O4 ranged from 83.75% to 117.07% when applied to river water and apple samples. These results demonstrate the great potential of ZIF-67@Fe3O4 in determining the residues of organic pesticides in real samples.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 41
·94112-94125
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IF 5.8
Zhang Mingyuan,Li Yueyao,Zhou Xiaoying,Wang Liping,Xie Yuke,Hou Chentao
In recent years, wastewater treatment to remove tetracycline hydrochloride (TCH) has received much attention in water treatment problems. ZIF-67/C 3 N 4 composite adsorbent, a nanosheet structured material stacked with MOFs, was prepared by in situ growth method, which has high adsorption activity for tetracycline hydrochloride in wastewater. Comparing the effect of monomeric and composite adsorbents, Z 6 C 2 had the best adsorption effect (206 mg·g −1 ), which was 77.6% higher than that of ZIF-67 (116 mg·g −1 ) and 10.8 times higher than that of C 3 N 4 (19 mg·g −1 ). The structure of ZIF-67 stacked on C 3 N 4 nanosheets has an excellent specific surface area and number of active sites, as well as π-π interactions, electrostatic interactions, and hydrogen bonding interactions between the adsorbent and TCH, which combine to enhance the adsorption performance. The adsorption process is accompanied by a combination of chemisorption, mass transport, and internal diffusion rate-limiting. It was shown that the adsorption process is favorable for monolayer adsorption as well as a heat absorption reaction that proceeds spontaneously. The adsorbent exhibits good stability and adsorption capacity, which may be suitable for efficient and low-cost water purification.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Ziyu Ma,Bing Yang,Yue Song,Yang Song,Jianbo Sun
ZIF-67 and its derived materials have large specific surface areas, high porosity, and high stability; therefore, they are widely used in sensors and other detection methods. However, their electrical conductivity is seriously affected due to their organic framework during the sensing process, limiting their practical applications. In this study, La-ZIF materials are successfully synthesized by a simple water bath method and heat treatment using La-doped Co-MOF as a precursor. The material which has lamella-lapped thin shell structure and resistance reduced by an order of magnitude was successfully synthesized. The systematic gas sensitivity test shows the material's promising response to H 2 S gas with high gas selectivity. The response value of La-ZIF5 to 50 ppm H 2 S is increased by one order of magnitude. The gas-sensitive and conductive mechanisms are analyzed with XPS and UPS results.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 22
·10031-10039
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IF 3.591
Qiwen Chen,Dandan Chu,Li Yan,Haichen Lai,Xue-Qiang Chu,Danhua Ge,Xiaojun Chen
Metal–organic frameworks (MOFs) as porous materials have significantly improved catalytic properties because of their rich active sites and large surface area. Herein, we develop a facile and efficient diffusion-controlled strategy to prepare ZIF-67 hollow nanoprisms (ZIF-67 HNPs) for a non-enzymatic glucose sensor. The interparticle pores of the hollow structure can afford fast diffusion pathway for guest molecules to move in and out of the MOF crystals. Such nanostructured MOF-based sensors exhibit good electrocatalytic activity towards glucose oxidation in an alkaline solution with a high sensitivity of 445.7 μA mM−1 cm−2, a low detection limit of 0.96 μM (S/N = 3) and a upper limit of 42.1 mM, and can be used to directly determine blood glucose. Moreover, it achieves well-pleasing results in the non-enzymatic analysis of glucose in real human blood serum samples. In addition, the as-prepared sensor also displays satisfactory reproducibility, selectivity and long-term storage stability. This study focuses on a facile strategy to design the in situ growth of hollow MOF nanomaterials as efficient and stable electrocatalysts, shedding light on the development of non-enzymatic sensors for monitoring glucose with transition metal-based hollow MOF catalysts.
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Journal of Central South University
·
2021
·Vol. 28
·期 5
·1279-1290
·
IF 1.716
Zhang Guang-ji,Tang Fei-ying,Wang Li-qiang,Yang Wen-jie,Liu You-nian
Transition metal sulfides (TMSs)-based materials have been extensively investigated as effective non-noble catalysts for various applications. However, the exploration of TMSs-based catalysts for hydrogenation of nitro compounds is limited. Herein, CoS x /NC catalysts were prepared by solvothermal sulfurization of ZIF-67, followed by high-temperature annealing (300–600 °C) under NH 3 atmosphere. It was found that the structures and compositions of the as-prepared CoS x /NC can be readily tuned by varying the annealing temperature. Particularly, CoS x /NC-500, which possesses higher degree of S defects and larger specific surface areas, can achieve high conversion, selectivity and stability for catalytic reduction of nitro compounds into amines under mild reaction conditions.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Yang Zang,Hui Luo,Hang Zhang,Huaiguo Xue
Layered double hydroxides (LDHs), composed of typical lamellar architectures, have become splendid electroactive materials for supercapacitors by means of large specific surface area and high theoretical capacitance. However, severe agglomerations and poor conductivities of single LDHs are disadvantageous to obtain the excellent electrochemical performance. Herein, polypyrrole nanotubes (PNTs) with good conductivity and mechanical capacity were prepared for in situ growth of ZIF-67, and the obtained PNT@ZIF-67 nanocomposites could serve as effective sacrificial templates and Co2+ sources. After a facile solvothermal reaction and acid etching, three-dimension hierarchical PNT-interconnected nickel cobalt-layered double hydroxide (PNT@NiCo-LDH) nanocages were successfully synthesized to construct the supercapacitors, in which the formed networking hierarchical structure could facilitate the uniform distribution of ZIF-67-derived NiCo-LDH nanocages, not only providing an enhanced conductivity and cycling stability but also achieving outstanding specific capacitance (1448.2 F g–1 at 1 A g–1). Additionally, the asymmetric supercapacitor, assembled by positive PNT@NiCo-LDH and negative activated carbon, could achieve an excellent energy density of 64.4 Wh kg–1 at 800 W kg–1 and endure a satisfactory cycling stability with 84.3% capacitance retention over 5000 cycles, which was superior to the electrochemical properties of the NiCo-LDH-dependent asymmetric supercapacitor, showing a promising prospect in high-performance supercapacitors.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 22
·28396-28407
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IF 3.056
Hu Guangzhuang,Zhang Wei,Chen Yuantao,Xu Cheng,Liu Rong,Han Zhen
With the development of the boron industry, boron pollution is getting more and more serious, and excessive boron will harm human health. In this paper, graphene oxide was used as a template to prepare ZIF-67, and GO/ZIF-67 was successfully prepared. GO/ZIF-67 was used for the first time to remove boron from water. SEM, XRD, and other characterization methods were used to confirm the structure. The adsorption kinetics, adsorption isotherm, adsorption thermodynamics, and adsorption mechanism of boron by GO/ZIF-67 were studied in this paper. The adsorption capacity of GO/ZIF-67 for boron is up to 66.65 mg·g −1 at 25 °C, and adsorption process reaches equilibrium in 400 min. Adsorption kinetics indicates that the adsorption process conforms to the pseudo-first-order kinetic model, and adsorption thermodynamics indicates that the adsorption process is a spontaneous endothermic process controlled by entropy change. The adsorption capacity of boron by GO/ZIF-67 does not decrease significantly after four cycles. The adsorption of boron by GO/ZIF-67 has both chemical and physical adsorption. From Zeta potential and adsorption kinetics, it can be seen that there is physical adsorption during the adsorption process and boron mainly has positive charge on the surface of GO/ZIF-67 and graphene oxide hydroxyl bonding. Based on the adsorption thermodynamics and XPS, it is known that there is chemisorption during the adsorption process, and mainly the combination of boron and cobalt sites.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xuejiao Liu,Wanwan Chen,Meiling Lian,Xu Chen,Yanluo Lu,Wensheng Yang
Metal-organic frameworks (MOFs) as a type of potential matrix for enzyme immobilization have attracted much interest. However, the sensitivity of most MOF-enzymatic electrochemical biosensors has not been satisfactory so far due to the poor conductivity and low apparent affinity of MOFs. In this work, new strategies have been presented: (i) using MOFs that themselves possess catalytic properties for substrates, so the synergistic catalysis by combining the MOFs and immobilized enzymes can be reinforced; (ii) introducing hydrophilic carbon nanomaterials and preparing MOF/carbon composites, not only the conductivity of the matrix but also the apparent affinity of immobilized enzyme for hydrophilic substrate can be remarkably enhanced. Horseradish peroxidase (HRP) and zeolite imidazolate framework-67(Co)/multi-walled carbon nanotube composite (ZIF-67(Co)/MWCNT) were adopted as the model enzyme and the immobilized matrix to illustrate and examine the proposed strategies. Compared with single component (ZIF-67(Co) or MWCNTs) based HRP electrochemical biosensors, the composite electrochemical biosensor displayed increased apparent substrate affinity (Michaelis constant K m reduced by ~75%) and 1.3-fold increased sensitivity in the detection of H 2 O 2 . The sensitivity (315 μA mM −1 cm −2 ) was also much larger than that of most previously reported MOF-HRP electrochemical biosensors. The proposed strategies are envisaged to be useful for other MOF-enzymes systems, which will be beneficial to the development of biocatalysis and biosensing.
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NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 6
·5170-5176
·
IF 3.277
Bibimaryam Mousavi,Somboon Chaemchuen,Behrooz Moosavi,Zhixiong Luo,Nadia Gholampour,Francis Verpoort
Zeolitic imidazole framework (ZIF)-67 is an efficient heterogeneous catalyst for the cycloaddition of carbon dioxide to epoxides to afford cyclic carbonates. In this work, ZIF-67 was synthesized by a simple and straightforward method at room temperature. The coupling reaction in the presence of ZIF-67 without any co-catalyst or solvent was studied under different conditions. The reaction conversion was more than 99% and the selectivity toward chloropropene carbonate was considerably higher (>99%) than the previously reported ZIF-8. Moreover, the ZIF-67 catalyst could be recycled at least four times without noticeable loss of catalytic activity.
研究领域:
化学
·
材料科学
·
环境科学
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PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·2079-2091
·
IF 3.6
Li Yingwen,Gao Fei,Li Yang,Shen Chenyang,Liu Chang-jun
There exist always some H 2 S in natural gas. The industrialized process for H 2 S removal is an energy intense process and must be applied in a large scale. An alternative process is needed. Herein, we report a removal of H 2 S from a model natural gas mixture with methane, ethane and propane by dielectric barrier discharge (DBD), with which the dielectric (quartz) is frosted and coated with a layer of zeolite imidazole framework-67 (ZIF-67) nanoparticles. Compared to the DBD without coating, the average electric field as well as the mean electron energy of the DBD with ZIF-67 coating are higher at the same specific energy input (SEI), leading to a high H 2 S conversion of 75.4% with the limited conversion of methane (less than 2%). No conversions of other low alkanes can be detected. This provides a potential way for the H 2 S removal from the natural gas sources in the remote or isolated region. Graphical abstract
研究领域:
化学工程
·
环境科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hanmeng Yuan,Zonghang Liu,Zhimin Zhao,Hongshuai Gao,Yi Nie
Owing to their unique physicochemical features, ionic liquids (ILs) are extensively utilized to dissolve cellulose for the preparation of regenerated cellulose fibers (RCFs) in the textile industry. However, Cu 2+ is introduced during the cellulose dissolution process and gradually accumulates, seriously affecting the RCF performance and IL recovery. Herein, to achieve an efficient and selective adsorption of Cu 2+ from ILs aqueous solutions, a facile and green method based on the in situ growth of zeolitic imidazolate framework-67 in wood hydrogels (ZIF-67@WH) is presented. The morphology, functional groups, crystallinity, thermal stability, and pore structure of the resulting ZIF-67@WH were investigated using various characterization techniques, and the adsorption selectivity, adsorption thermodynamics, adsorption kinetics, and recoverability were examined in depth by performing batch experiments. The ZIF-67@WH exhibits high adsorption selectivity for Cu 2+ and ILs with adsorption ratios of 92.8 % and 2.2 %, respectively. The selective adsorption mechanism was elucidated by means of FT-IR, XPS, DFT, and MD. As the key for the selective adsorption, the N site in ZIF-67 dramatically promotes the coordination with Cu 2+ , while the adsorption for ILs mainly occurs via hydrogen bonding and van der Waals interactions with adsorption energies of –80.61 and –35.33 kcal mol −1 , respectively. The results demonstrate that this approach constitutes a feasible technique for the efficient separation of Cu 2+ and ILs in the textile industry.
研究领域:
材料科学
·
环境科学
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Dandan Ma,Zhonghan Cheng,Ye Yuan,Somboon Chaemchuen
The heterometal functionalization on zeolitic-imidazole frameworks (ZIFs) is a strategy to modify properties over the homometal ZIFs. A green strategy for simultaneously functionalized iron atoms during the crystal formation of ZIF-67 (Fe@ZIF-67) through the solid-solid thermal (SST) method is newly developed. The single-step process and absent solvent conditions are beneficial advantages of this SST method over the early reported synthetic methods. The results show that the iron is well-dispersed and homogeneously coordinated in the structure of Fe@ZIF-67. Moreover, the optimal iron-functionalized ZIF-67 (20Fe@ZIF-67) significantly enhances the catalytic performance of CO 2 cycloaddition epoxide by 2.3 times compared to pristine ZIF-67 under mild reaction conditions. The DFT calculation reveals that the iron atom induces the unsaturated sites or defect structure on the Fe@ZIF-67 catalyst, providing more reactive sites for the catalytic activity of the reaction.
研究领域:
材料科学
·
环境科学
·
化学工程
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