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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Kun Li,Han Tang,Mingke Yang,Xiaowan Peng,Ruihang Zhang,Chun Deng,Yunlei Peng,Bei Liu,Changyu Sun,Guangjin Chen
Separation of light hydrocarbon isomers is always an important and challenging task in the petrochemical industry due to their similar physicochemical properties. This paper presents the absorption-adsorption hybrid method to separate pentane isomers using a flowable zeolitic imidazolate framework-8 (ZIF-8) slurry prepared with N, N′-Dimethylpropylene urea (DMPU) and water. Firstly, the single-component kinetic sorption profiles for n-pentane and iso-pentane in the slurry were measured. It appears significant sorption kinetic differences between the pentane isomers in ZIF-8/DMPU-water slurry. Subsequently, the separation performances for n/iso-pentane gas mixtures were studied systematically. The results show that the selectivity for pentane isomers using ZIF-8/water slurry is extremely high (1877 specifically), and the selectivity decreases gradually when the DMPU content in the solvent increases, while conversely the sorption speed increases rapidly. The selectivity as a function of time was described to graphically characterize the kinetic-based separation for pentane isomers. With excellent behavior in selectivity, sorption speed, sorption capacity (1.10 mol/L for n-pentane in ZIF-8/DMPU slurry), and renewability, this absorption-adsorption hybrid method is of great potential in the separation of pentane isomers.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Yanzheng Ji,Xingyu Liu,Haochen Li,Xuan Jiao,Xinquan Yu,Youfa Zhang
The performance of activated carbon (AC) will be severely affected for carbon dioxide (CO 2 ) capture in flue gas, as they usually suffer from competitive adsorption of water vapor. Establishment of a barrier against moisture on the surface of porous adsorbent material could potentially address this issue. Zeolite-like metal–organic frameworks (ZIF-8) as a promising adsorbent material demonstrates hydrophobic properties, large specific surface area, and highly porous structure. Here, by further growth of ZIF-8 on polydopamine (PDA)-coated bio-based carbon (AC@PDA), we fabricate hydrophobic final product (AC@ZIF-8). The CO 2 capture capacities of AC@ZIF-8 was 41.69 cm 3 /g, which is only 13.61% lower than that of the initial AC under dry conditions. The hydrophobic ZIF-8 layer can effectively prevent water molecules from reaching the interior AC. Therefore, the adsorption of CO 2 for AC@ZIF-8 decreased by only 16.74% under high relative humidity, while it decreased by 61.27% for bare AC. This strategy will broaden the applications of carbon-based adsorbents for CO 2 capture under severely humid conditions. We believe that this approach is also applicable for an extensive set of CO 2 capture materials that suffer from water instability.
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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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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 47
·e53193
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IF 3.057
Xiuzhou Lin,Qiang Peng,Song Duan,Chunjiang Zhang,Xulei Chen,Zhiqiang Deng,Baojie Dou,Yingjun Zhang,Xiulei Gao,Zhiwen Fang
In this study, ZIF-8 modified fluorinated graphene composite (FG@ZIF-8) was innovatively prepared and used as a novel functional filler to improve the anticorrosion performance of epoxy coating on Q235 carbon steel. The morphology and structure of FG@ZIF-8 composites were characterized by scanning electron microscopy (SEM), x-ray powder diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR), and x-ray photoelectron spectroscopy (XPS) tests. The results showed that the structure and morphology of the composites largely depended on the composition ratio of FG and ZIF-8. The mechanical properties and corrosion resistance of FG@ZIF-8 modified coatings were also investigated. The unique two-dimensional sheet structure and insulation of FG in the FG@ZIF-8 filler can not only inhibit the penetration of corrosive media but also discourage electron migration effectively on the interface of coating/matrix during the electrochemical reaction. Meanwhile, the chemical cross-linking between the amine groups in ZIF-8 and the epoxy group increases the degree of densification of the coatings. Besides, the 2-methylimidazole from the dissolution of ZIF-8 on FG@ZIF-8 will also inhibit the corrosion reaction. These advantages endow the FG@ZIF-8 modified epoxy coatings an excellent long-term corrosion resistance. Our findings may inspire the development of new graphene-based materials with superior protective properties for metallic materials.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Jinxiao Ba,Hui Cheng,Zhenhan Li,Xianghai Yu,Aiying Song,Chengqun Xu,Donghua Fan,Shengye Jin
In this work, we develop Ni/Ni 3 S 2 /CdS composite photocatalytic system from annealing of CdS nanosphere coated Ni-ZIF by simple solvothermal method. The Ni/Ni 3 S 2 /CdS synthesized after calcination at 700 °C exhibits the best hydrogen evolution performance with an average hydrogen evolution rate of 2104.02 μmol/g/h, which is 152 times higher than that of pure CdS, and external quantum efficiency is 41.9% (λ = 420 nm). Using a series of characterization methods, we revealed that CdS is the photosensitizer, Ni is the catalytic active species, and Ni 3 S 2 formed between Ni and CdS formation plays an important role in charge separation as confirmed by time resolved emission spectroscopy. In addition, the regulation of Ni loading is achieved by changing the annealing time and the molar ratio of Ni salt to CdS. These results demonstrate that Ni/Ni 3 S 2 /CdS is a favorable photocatalyst for efficient photocatalytic hydrogen evolution.
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Biomaterials Science
·
2022
·Vol. 10
·期 17
·4837-4847
·
IF 7.59
Essam Abdo Mohammed Saad Obaid,Shuai Wu,Yuan Zhong,Meng Yan,Li Zhu,Bibo Li,Yi Wang,Wei Wu,Guixue Wang
Nanomedicines represent new promising strategies for treating atherosclerosis (AS), because they enhance drug bioavailability and have lower side effects. Nevertheless, nanomedicines have several challenges with these advantages, including a limited circulation life, lack of precise targeting, and insufficient control of drug release. Accordingly, the development of drug delivery systems (DDSs) with abilities to enhance the payload delivery to the AS plaque lesion and to control drug release can boost the therapeutic efficacy and safety for AS treatment. Herein, we employed a one-step self-assembly approach for effectively encapsulating the anti-AS drug simvastatin (SIM) in zeolitic imidazolate framework-8 (ZIF-8) (SIM/ZIF-8), and then coated it with hyaluronic acid (HA) to fabricate the SIM/ZIF-8@HA nanoplatform. The resulting nanoplatform could efficiently accumulate in plaque regions through the specific recognition between HA and CD44. Meanwhile, the acid environment breaks down ZIF-8 to release SIM. The in vitro and in vivo experiments demonstrated that SIM/ZIF-8@HA could inhibit the proliferation of smooth muscle cells and have good biocompatibility. Moreover, SIM/ZIF-8@HA can effectively suppress the development of AS plaques without any considerable side effects in mice treatments. The findings revealed that SIM/ZIF-8@HA may be a promising nanomedicine for safe and efficient anti-AS applications.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Yingjian Ma,Rui Zhao,Hongyi Shang,Shuo Zhen,Linjie Li,Xinyu Guo,Meng Yu,Yong Xu,Jianguo Feng,Xuemin Wu
Pesticides are the primary defending strategy against major biological invaders and important for ensuring national food security. Intelligent nanopesticides with precise controlled release modes are currently an emerging area of interest in the field of green, safe, and sustainable pesticide formulation. In this study, β-cypermethrin (β-CYP) was loaded into ZIF-8 by the one-pot method, which successfully prepared a pH-responsive delivery nanoparticle (β-CYP/ZIF-8) to control termites. Results demonstrated that β-CYP/ZIF-8 had a mean diameter of 188 ± 2 nm and a loading capacity of approximately 21%. In vitro release experiments showed that β-CYP/ZIF-8 releases better in acidic than in neutral conditions due to the presence of intermediate acid-unstable imidazole organic compounds. The acidic microenvironment in which termites thrive can promote β-CYP release due to ZIF-8 decomposition, thus improving pesticide targeting and reducing toxic side effects. The bioactivity survey confirmed that β-CYP/ZIF-8 could control termites (Coptotermes formosanus Shiraki) for a longer duration compared to commercial wettable powder (WP) and emulsifiable concentrate (EC). Moreover, an acute toxicity test showed an over 2- and 10-fold reduction in the acute toxicity of β-CYP/ZIF-8 to earthworms and zebrafish, respectively, compared to that of commercial WP and EC. Finally, the cytotoxicity assay of β-CYP/ZIF-8 showed higher safety to human hepatocyte LO2 cells. Overall, these β-CYP/ZIF-8 nanoparticles, prepared using the one-pot method, have great application potential in sustainable pest management and protection of the ecological environment.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 13
·4312
·
IF 4.927
Xiaowei Wang,Yingjie Zhao,Yiqi Sun,Dahuan Liu
Residual antibiotics in wastewater have gained widespread attention because of their toxicity to humans and the environment. In this work, Cu-doped ZIF-8s (Cu-ZIF-8s) were successfully synthesized by the impregnation of Cu2+in ZIF-8 and applied in the removal of ofloxacin (OFX) from water. Remarkably, excellent adsorption performance was obtained in Cu-ZIF-8s, especially for Cu-ZIF-8-1, in which the adsorption capacity (599.96 mg·g−1) was 4.2 times higher than that of ZIF-8 and superior to various adsorbents reported previously. The adsorption kinetics and adsorption isotherm follow the pseudo-second-order model and the Langmuir model, respectively. Furthermore, the removal efficiencies of OFX in Cu-ZIF-8-1 reached over 90% at low concentrations. It was revealed that electrostatic interaction and complexation play important roles in the adsorption process. In addition, the material can be regenerated by simple methods. Therefore, the obtained Cu-doped MOFs may have a promising application in the treatment of antibiotic-containing wastewater.Keywords:adsorption;complexation;metal-organic frameworks;ofloxacin
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 12
·6629-6639
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IF 4.682
Lin Jiaxin,Lu Huan,Duan Yingchun,Yu Chenhong,Li Li,Ding Ya-ping
The detection method with potential ability to diagnose drugs in human serum rapidly, highly sensitivity and selectivity is of vital importance for clinical diagnosis. In this paper, an electrochemical sensor on the basis of composite material modified by zeolitic imidazolate framework (ZIF) on carbon nanofiber (CNF) surface is constructed, which is used for ultra-sensitive determination of adrenaline (AD). CoMnZIF-CNF combines the good conductivity of carbon nanofibers and the high electrocatalysis of CoMnZIF, which can improve the reaction activity and the sensing effect of adrenaline. The proposed sensor shows a good linear relationship between AD concentration from 5 to 1000 μM, and the detection limit is 0.22 μM. Meanwhile, CoMnZIF-CNF demonstrated the remarkable selectivity, significant repeatability and stability, as well as excellent reproducibility. Besides, through the analysis of AD in serum electrolyte, the practicability of the sensor was evaluated and the recovery rate was between 97.51 and 102.53%. On the basis of the results, the prepared sensor has a vital application prospect in detecting AD in actual sample analysis.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Yongmei Ge,Kui Wang,Jiayi Liu,Ye Tian,Huili Li,HuiZhen Wang,Zhaowei Lin,Mingxia Qiu,Bin Tang
Chronic osteomyelitis (COM) is an inflammatory bone disease caused by bacterial infection. Conventional treatment with antibiotics is prone to resistance and other side effects, and it is ineffective against inflammation caused by infection and bone loss . To treat COM comprehensively, based on the acidic microenvironment of osteomyelitis, we used ZIF-8 and celecoxib to construct a multifunctional intelligent drug release system with pH response effect, named [email protected] Material characterization revealed that celecoxib is successfully loaded into ZIF-8. Ion release and drug release experiments indicated that [email protected] can respond well to the pH and intelligently control the release of ions and drugs. Antibacterial assays manifested that [email protected] is able to inhibit the growth of bacteria significantly. In vitro cell experiments demonstrated that [email protected] can significantly up-regulate the expression of osteogenesis-related cytokines and down-regulate the levels of inflammatory factors. Studies verify that the novel drug release system possesses multiple functions: antibacterial, osteogenesis, anti-inflammatory and intelligent release, suggesting a tremendous clinical promise for the treatment of COM.
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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
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