MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Mingkun Gao,Guangyang Liu,Qiyue Tan,Chenxi Zhao,Ge Chen,Rongqi Zhai,Yuwei Hua,Xiaodong Huang,Jing Wang,Donghui Xu
A novel fluorescent composite (CDs@ZIF-L) was synthesized for the selective detection of Fe 3+ based on the encapsulation of Carbon dots (CDs) into Zeolitic imidazolate frameworks (ZIF) with a two-dimensional leaf-like structure. The physicochemical structure, surface morphology, and composition of the adsorbent were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The results showed that unlike the conventional three-dimensional rhombic structure (ZIF-8), the synthesized two-dimensional leaf-like nanosheets (ZIF-L) not only maintained the structural integrity but also had a permeable pore structure. Importantly, at an excitation wavelength of 350 nm, the composite's had significant fluorescence emission at 445 nm and was effectively quenched in the presence of Fe 3+ , which can be used as an effective fluorescent scaling probe. Under the optimal conditions, CDs@ZIF-L was used as a fluorescent probe to detect Fe 3+ with good linearity in the range of 0.02–2 mM (R 2 = 0.9948) and a low detection limit of 0.891 μM. The fluorescent probe can also be used for the determination of Fe 3+ in fruit samples with good recovery and accuracy, showing great potential for applications in environmental monitoring and agricultural pollutant control. It has good recovery and accuracy and shows great potential for environmental monitoring and agricultural pollutant control.
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高影响因子
Journal of Physical Chemistry C
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2022
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IF 4.177
Yufei Huang,Yalan Xie,Jia Zhao,Xuan Yin,Chunpeng Chai
Microwave-absorbing materials that are used for stealth weapons and equipment should have excellent characteristics of strong absorption, a wide absorption bandwidth, low thickness, and light weight. Ti3C2Tx, as a two-dimensional (2D) MXene material, shows great potential in the field of microwave absorption. However, MXene has problems of impedance mismatch, a narrow absorption bandwidth, and poor absorption performances. In this study, we designed a series of ZIF-8/MXene-based microwave-absorbing materials known as porous ZnO/MXene nanocomposites, which were synthesized by an in situ composite method before being annealed under vacuum. Then, the structure and performances of porous ZnO/MXene were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and using a vector network analyzer (VNA). We investigated the influences of the mass ratio, microstructure, morphology, and microwave absorption performances of the samples on raw materials. As a result, ZnO/MXene nanocomposites with a mass ratio of Zn2+/MXene = 2:1 showed the optimum microwave absorption performance. The minimum reflection loss was −34.31 dB at 8.8 GHz (thickness 1.0 mm), and the effective absorption bandwidth was 3.47 GHz from 13.49 to 16.96 GHz.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Yuan Chen,Hao Guo,Fan Yang,Ning Wu,Junye Zhang,Liping Peng,Bingqing Liu,Zhilan Pan,Wu Yang
A metal porous carbon (Ni@NC) supported nickel/cobalt layered double hydroxide (NiCo-LDH) (Ni@NC@NiCo-LDH) with a cauliflower morphology was synthesized by a successive double template method . At first a nickel metal-organic framework (Ni-MOF) was prepared and used as a sacrifice template to produce metal porous carbon (Ni@NC). Then the prepared conductive porous carbon material was exploited as a substrate for in-situ growing of ZIF-67 on its surface. Lastly the obtained Ni@NC@ZIF-67 was further used as a sacrifice template to prepare the final electrode material Ni@NC@NiCo-LDH by Ni 2+ etching and co-precipitation. The cooperation of Ni@NC with excellent conductivity and NiCo-LDH with superior pseudocapacitive property yielded a synergistic effect , which effectively improved the electrochemical performance of the resulted electrode material. And the special flower morphology exposed more redox active sites and provided proper charge transport path for enhanced electrochemical performance. The prepared Ni@NC@NiCo-LDH exhibited a high specific capacitance of 1761.8 F·g −1 at the current density of 1 A·g −1 . The assembled Ni@NC@NiCo-LDH//AC asymmetric supercapacitor also displayed an acceptable energy density (39.27 Wh·kg −1 at the power density of 757.21 W·kg −1 ) and ultrahigh cycling stability (94.74% capacitance retention after 25000 cycles at 10 A g −1 ).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yu Liu,Shuai Yang,Xinyu You,Linlin Qin,Yiming Qin,Wenwen Zhang,Wenyan Liang
Electrocatalytic hydrogenation (ECH) has been used as a novel approach for the synthesis of organic compounds. Hence, ZIF-67 was selected as a precursor in this study to synthesize a series of electrodes. The ECH effects were assessed on pyridine and diazines. The results showed a significant influence of carbonization temperature and time on the electrocatalyst activity. A temperature of 400 °C was found not high enough for the synthesis of the electrocatalysts, and a long time of 4 h at 800 °C resulted in damage to the spatial structure of the electrocatalyst. The optimal electrocatalyst was obtained under 800 °C and 2 h (Co/NC-800–2). The polyhedral Co/NC-800–2 (20–200 nm) had the N-doped graphitic-carbon shell with embedded Co/CoN/Co 3 O 4 nanoparticles . The onset potential and overpotential (at 10 mA cm −2 ) were estimated to respectively 64 and 155 mV versus hydrogen evolution reaction (HER), with a Tafel value of 62 mV dec −1 . The ECH on pyridine and diazines revealed a positive correlation between ECH effect and HER activity. Co/NC-800–2 possessed excellent ECH activity toward pyridine and pyrazine at − 0.3 V (vs. RHE). N–Co, pyridinic-N, and graphitic-N acted as active sites during electrocatalysis . The N-doped graphitic-carbon promoted the charge transfer during ECH processes.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Wenfeng Zhou,Xiaohong Zhou,Yuan Rao,Rijia Lin,Lei Ge,Pengpeng Yang,Hongman Zhang,Chenjie Zhu,Hanjie Ying,Wei Zhuang
Enzyme catalysis has clear advantages in the process of oxidizing glucose to produce gluconic acid . In the enzyme cascade, the improvement of the cascade efficiency is desired but challenging. Graphene oxide (GO) and ZIF-8 composites as enzyme support offer the promising opportunity that not only the cascade efficiency can be improved by control the distance between two enzymes, but also the stability can be improved. Here, a new strategy of GO assisted co-growth of ZIF-8 and enzyme was carried in a one-pot synthesis. Glucose oxidase&catalase immobilized in the ZIF-8/GO composites can obtain 98% residual activity after 15 days of storage with almost no enzyme shedding. The residual activity is still higher than 75% after 5 repeated uses. The presented method of controllable growth of metal organic frameworks on 2D nanosheet can also be extended for renewable energy devices, gas storage and separation of small molecules .
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PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Qian Luo,Xiaomin Qian,Xiaona Mi,Yifeng Tu
A new type of immunosensor was prepared by using a gold nanoparticles/aminozeolitic imidazolate framework-67 nanocomposite (AuNPs/ZIF-67) as the sensing matrix and luminol as the signaling probe to detect the heart failure biomarker N -terminal probrain natriuretic peptide (NT-proBNP). The hybrid nanocomposite was deposited on the surface of indium tin oxide (ITO)-coated glass via the linkage of 3-aminopropyltrimethoxysilane (APTMS); thereafter, the NT-proBNP antibody was immobilized to endow biological specificity, and bovine serum albumin was used to block residual active sites. The resultant sensor has an excellent response when NT-proBNP was attached to the antibody via immunoreaction; here, the output signal was reduced because of the depressed mass transportation of the electrochemiluminescence (ECL) probe and electron transference. The resultant ECL immunosensor displayed a broad linear range from 10 pg/mL to 50 ng/mL, and the low detection limit was 0.74 pg/mL. The ECL immunosensor also has good specificity, stability and reproducibility and can be used to detect NT-proBNP in real blood samples.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Zhiqiang Guo,Hongli Wang,Liang Wang,Bin Zhao,Yiran Qian,Hongwei Zhang
Pharmaceuticals and personal care products (PPCPs) are universally detected in natural waters, posing potential risks to drinking water safety. Nanofiltration (NF) is an advanced technology for water purification; however, its removals of PPCPs are unsatisfying, especially for hydrophobic species. In this study, the 3D architecture of nanomaterials were used to manipulate the performance the polyamide (PA) thin-film nanocomposite (TFN) membrane. In-situ addition of polyethyleneimine (PEI) successfully induced the assembly of ZIF-8 nanocrystals into star-shaped clusters (ZIF-8-PEI) due to the coordination between PEI and Zn 2+ . Together with the improved hydrophilicity, these ZIF-8-PEI clusters became excellent scaffolds for water drop retention after discretely loading onto the porous substrate. The conical protrusions of the ZIF-8-PEI clusters supported the defect-free PA film produced by the interfacial polymerization (IP), leaving big interfacial cavities underneath. These cavities worked as gutters for water transport, and the water permeance of the optimal TFN was 79% higher than that of the pristine thin-film composite (TFC) membrane. Moreover, the water impregnated cavities markedly alleviated the hydrophobic interaction between the PA film and hydrophobic PPCPs, impeding the transport of PPCPs across the membrane. Our results demonstrated the importance of the 3D architecture of nanofillers for the improving membrane performance.
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高影响因子
COMPOSITES COMMUNICATIONS
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2022
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IF 7.685
Meng Liu,Zhaozhu Zhang,Yanling Wang,Peilong Li,Mingming Yang,Junya Yuan
Herein, TiN@ZIF-8 hybrid with hierarchical structure was constructed by in situ growth of Zeolitic Imidazolate Frameworks-8 (ZIF-8) onto the TiN surface via a PDA/PEI (polydopamine/polyethyleneimine) intermediate layer. The characterization of structure and chemical composition affirmed the successful assembly of TiN@ZIF-8 hybrid and the specific surface area of TiN@ZIF-8 hybrid showed a sharp increase from 3.5 m 2 /g for pristine TiN to 183.4 m 2 /g. The resulted TiN@ZIF-8 hybrid was aimed at strengthening the mechanical and tribological properties of fabric composites . The results demonstrated that the tensile strength of TiN@ZIF-8/fabric composites presented an increase by 48% due to the stress transfer and reinforcement of TiN@ZIF-8. Additionally, the incorporation of TiN@ZIF-8 restricted the moving of resin molecular chain and escape of decomposition products, contributing to the improvement in heat resistance of fabric composites. Friction and wear tests indicated that the abrasion resistance of TiN@ZIF-8/fabric composites was significantly improved in comparison with pristine composites because the ZIF-8 loaded on the surface of TiN made for a more even dispersion of TiN, and the introduction of TiN@ZIF-8 contributed to forming a uniform, dense transfer film due to the synergistic enhancement between TiN and ZIF-8.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Mingwu Wang,Guoxun Peng,Chunlin Chen,Lei Zhang,Yuan Xie
Herein, carbon spheres (CS) were obtained by a simple hydrothermal reaction using glucose as the raw material, which can be used as a green, cost-effective inorganic flame retardant . Then, the zeolitic imidazolate framework-8 (ZIF) nanoparticles were uniformly anchored on the surface of the CS, which could promote the formation of carbon residues, while the release of inert gas could reduce the substrate surface temperature, thereby delaying the combustion reaction. In addition, the SiO 2 film was coated on the surface of ZIF-loaded CS (CS/ZIF) to fill the micropores left by thermal decomposition of ZIF nanoparticles. More importantly, the residual SiO 2 shell after combustion can effectively improve the barrier effect of char layer on flame and heat. The effect of the obtained CS/ZIF@SiO 2 hybrids on the fire performance of epoxy resins was characterized by fire performance tests. The experimental results showed that the backside temperature of the CS/ZIF@SiO 2 based composite coating was stabilized at the lowest value (173.6 ℃) due to the combined effect of ZIF nanoparticles and silica film. In addition, the CS/ZIF@SiO 2 /EP showed the maximum expansion height and expansion rate after burning in a muffle furnace for 60 min. Meanwhile, the composite coating exhibited the maximum residual carbon (29.1%) and thermal decomposition temperature (T max , 378.1 ℃). The results of smoke density test proved that the composite coating had higher smoke suppression effect compared with other samples.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yuhan Long,Songrong Li,Peizhen Yang,Xi Chen,Wenhao Liu,Xuesong Zhan,Cheng Xue,Dongfang Liu,Wenli Huang
MOF-derived metal-carbon composite catalyst was an alternative high-efficient catalyst for activating peroxymonosulfate (PMS). In this study, a novel cobalt-carbon-nitrogen doped composite catalyst with honeycomb porous structure (Co-HPNC) was obtained through a simple strategy consisting of three steps: self-growth of ZIF-67 on the SiO 2 core, pyrolysis, and NaOH etching away SiO 2 core. The Co-HPNC exhibited an outstanding catalytic performance (98.1% in 10 min) to activate PMS for acid orange 7 (AO7) degradation. The observed reaction kinetic constant (0.4319 min −1 ) was 2.64 times superior to that of the unmodified Co/NC catalysis system (0.1636 min −1 ). In the meantime, the catalyst demonstrated a high PMS activation capacity over a wide pH range of 3–11 and strong adaptability to the high concentration of inorganic anions (Cl - , SO 4 2- , and CO 3 2– ). After being recycled three times, the removal efficiency could still reach 92.7% in 25 min. The quenching tests and EPR spectrum illustrated the existence of radical and non-radical pathways, in which singlet oxygen was dominant during the degradation process. It was hypothesized that Co(0)/Co(Ⅱ)/Co(Ⅲ), pyridinic-N and pyrrolic-N contributed to the generation of hydroxyl and sulfate radicals, while C=O functional group and graphitic-N were catalytic sites for singlet oxygen. Finally, the radical electrophilic attacking sites of AO7 were calculated by the density functional theory (DFT), and the degradation routes of AO7 were speculated by GC–MS. The toxicity test illustrated that the Co-HPNC/PMS system was an environmental-friendly technology for AO7 degradation. The prepared Co-HPNC with a unique honeycomb porous structure presents a novel synthesis route for MOF-derived catalyst applied in the PMS activation system for wastewater treatment.
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高影响因子
Journal of Environmental Sciences
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2022
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IF 6.796
Jiacheng Zhou,Hao Zhang,Tianying Xie,Ye Liu,Qicheng Shen,Jie Yang,Limei Cao,Ji Yang
The stronger coordination ability of mercury ions with organic ligands than the metal ions in metal organic framework (MOFs) provides an accessible way to separate mercury ions from solution using specific MOFs. In this study, a Co-based MOF (ZIF-67, Co(mIM) 2 ) was synthesized. It did not introduce specific functional groups, such as -SH and -NH 2 , into its structure through complicated steps. It separate Hg 2+ from wastewater with a new strategy, which utilized the stronger coordination ability of Hg 2+ with the nitrogen atom on the imidazole ring of the organic ligand than the Co 2+ ions. Hg 2+ replaced Co 2+ nodes from ZIF-67 and formed a more stable precipitate with mIM. The experimental results showed that this new strategy was efficient. ZIF-67 exhibited Hg 2+ adsorption capacity of 1740 mg/g, much higher than the known MOFs sorbents . mIMs is the reaction center and ZIF-67 can improve its utilization. The sample color faded from purple to white due to the loss of cobalt ion. It is a great feature of ZIF-67 that allows users to judge whether the sorbent is deactivated intuitively. ZIF-67 can be sustainable recycled by adding organic ligands to the solution after treatment due to its simple synthesis method at room temperature. It's a high-efficient and sustainable sorbent for Hg 2+ separation from wastewater.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Rui Ding,Qiuchen Wang,Xuehua Ruan,Yan Dai,Xiangcun Li,Wenji Zheng,Gaohong He
1D nanotube (HNT) based MMM presents high CO 2 permeation due to its long and hollow structure. However, the improvement of selectivity is still challenging. In this study, small PEI molecules with abundant amino groups were introduced into the nanocages of ZIF-8 HNTs to construct facilitated CO 2 transmission channel with low resistance. In the PEI@ZIF-8 HNTs, the –NH 2 groups can facilitate CO 2 transport in presence of H 2 O, resulting in an improvement in both CO 2 permeability and selectivity. Second, the introduction of PEI into the nanocages of ZIF-8 can adjust the effective sieving size to enhance CO 2 selectivity. Third, the hydrogen bond between PEI and Pebax can strengthen the interfacial compatibility, further improving CO 2 /N 2 selectivity of the MMMs. Finally, the 1D hollow structure of PEI@ZIF-8 HNTs provides CO 2 molecules with low-resistance and fast transport channel, enhancing the CO 2 permeability. Consequently, both the high CO 2 permeability and the high CO 2 /N 2 selectivity are acquired by the versatile filler of PEI@ZIF-8 HNTs. PEI@ZIF-8 HNTs based MMM at filler loading of 7 wt% under dry mixed gas, presents CO 2 permeability of 177 Barrer and CO 2 /N 2 selectivity of 72, which are 40% and 10.8% higher than those of ZIF-8 HNTs based MMM, respectively. Moreover, the permeability of CO 2 and the selectivity of CO 2 /N 2 reach 306 Barrer and 79 respectively under the wet mixed gas, which is far beyond the Robeson upper bound in 2008 and exceeds the McKeown upper bound in 2019. The proposed PEI@ZIF-8 HNTs are believed to be promising filler for MMMs based CO 2 capture.
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高影响因子
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