APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Ping Dai,Yuchao Yao,Enzheng Hu,Dongyan Xu,Zhongcheng Li,Chuansheng Wang
In this work, a composite consisting of ZIF-67 and graphene oxide (GO) was successfully synthesized by a facile in-situ synthesis method and applied in hydrogen release from the methanolysis of sodium borohydride (NaBH 4 ). Physicochemical properties of pure ZIF-67 and the ZIF-67@GO composites are well characterized by XRD, BET, SEM and HRTEM. It was observed that the ZIF-67 crystals are intimately anchored on GO sheets. An increase of GO in the composite led to a marked decrease of the BET surface area and an increased average pore size. However, the ZIF-67@GO precursor with high GO doping exhibited much higher activity toward the methanolysis of NaBH 4 , which suggests that the good conductivity of GO is beneficial to improve the catalytic performance. The ZIF-67@GO precursor experienced a structure reconstruction during the methanolysis reaction due to the presence of reducible Co 2+ . Moreover, the reduced ZIF-67@GO displayed a slightly higher activity as compared to the pristine composite and retained excellent durability after five cycles. A possible mechanism for the hydrogen generation from the methanolysis of NaBH 4 using a ZIF-67@GO catalyst was proposed.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 11
·7389-7404
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IF 5.044
Xu Jiangtao,Shang Songmin,Gao Wei,Zeng Ping,Jiang Shouxiang
Although strategies of compositing noble materials and Zeolitic imidazolate frameworks (ZIFs) have been used to enhance the performance of ZIF-based surface-enhanced Raman scattering (SERS) substrates, the enhancement process still remains unclear and the sampling process with powder-form substrates is challenging for practical applications. In this study, a flexible SERS substrate with silver (Ag) nanoparticle decorated ZIF-67 as the active materials and cotton fabric as the supporting framework is developed with a facile method in two steps. The proposed flexible SERS substrate not only can reduce difficulties during the sampling process, but also expands future applications for sampling towards irregular target substances. Meanwhile, the enhancement mechanism has been investigated by using Methylene Blue to probe the molecular interactions. The constructed SERS substrate shows the highest enhancement factor of 6.25 × 10 6 and an excellent detection sensitivity with a limitation of detection (LoD) of 10 –14 M/L. Because of its excellent performance in SERS tracing, the proposed SERS substrate shows exceptional ability in detecting and identifying phenol-soluble modulins and is considered to be a label-free approach that requires no adding markers/tags or antibodies. The proposed substrate expands the potential applications of SERS technology for rapid detection of bacterial toxins during clinical diagnoses and treatment. Graphic abstract Ag decorated ZIF-67 particles are anchored onto cotton fabric to fabricate flexible SERS substrates. The proposed flexible SERS substrate achieves high SERS activity with high enhancement factor, low LoD, good reproducibility and stability. The flexible SERS substrate shows great potential in detection and identification of Phenol-soluble modulin.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 21
·9382-9393
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IF 3.591
Xiangzhi Feng,Yuanyuan Li,Yuanyuan Yang,Yulong Ma,Wenxin Ji,Yonggang Sun,Tong Chen,Yang Chen
In order to achieve rapid and effective analysis of praziquantel and pymetrozine residues in food, a new magnetic solid phase extraction (m-SPE) material based on GO and ZIF-67 was synthesized. Because the release of ZIF and GO materials may lead to secondary environmental pollution and their separation from solutions is difficult, ZIF-67 loaded on sheet-like MGO@PDA, a magnetic porous nano-composite, was fabricated by a convenient method at room temperature. The poly-dopamine (PDA) layer can improve the hydrophilicity of the material. The resultant MGO@PDA@ZIF-67 preserved the properties of ZIF-67 and MGO. The adsorbent material was characterized by XRD, VSM, TEM, SEM, TGA, XPS and FTIR experiments. An m-SPE technique was developed to selectively enrich two pyridine ring insecticides (praziquantel and pymetrozine) using high performance liquid chromatography (HPLC). The adsorption mechanism was investigated. Results showed that the maximum adsorption capacities of the new material for praziquantel and pymetrozine are 22.68 and 24.27 mg g−1, respectively. The method was successfully applied to the analysis of praziquantel and pymetrozine in vegetable samples with satisfactory recoveries (92.3%–102.8%) and precisions. Due to the advantages of easy preparation, high efficiency, and renewability, the prepared hydrophilic magnetic porous nano-composite is an excellent candidate for adsorption and separation and provides a promising magnetic ZIF-67 material for multi-component system separation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Jie Yang,Ao Zhang,Yuxin Chen,Linsheng Wang,Meixian Li,Hongyu Yang,Yanbei Hou
Biomass materials are considered to be excellent candidates to replace petroleum-based materials, but inherent flammability limits their applications. In this work, biomass aerogel (BA) was prepared by freeze-drying method from sodium alginate (SA) and polyvinyl alcohol (PVA). To improve fire safety of BAs, a core–shell structured ZIF-67@Cobalt coordination compound was successfully synthesized, which was surface functionalized by 3,5-diamino-1,2,4-triazole and 9,10-dihydro-9-oxo-10-phospho-diphenyl-10-oxide (DOPO), named as DOPO-NH 2 -ZIF-67. The addition of DOPO-NH 2- ZIF-67 (2 wt%) outstandingly improved fire safety of BA, in contrast to neat BA, peak heat release rate, peak smoke production rate, and total smoke production were reduced by 66.6%, 85.10%, and 72.76%, respectively. Furthermore, the incorporation of ZIF-67 and its derivatives has no adverse effect on the thermal insulation performance of BA composites and significantly improved their compressive strength from 0.27 MPa to 1.76 MPa. Preparation of core–shell structured ZIFs rich in active groups furnishes a conceivable way to synthesize an effective flame retardant, and a prospective method for the fabrication of aerogel insulation materials with green and economical additive-free technology is proposed.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Di Liu,Jiulong Yin,Hai Tang,Hui Wang,Shasha Liu,Tingting Huang,Sisheng Fang,Kaixuan Zhu,Zongli Xie
Efficient separation and excellent antifouling performance of ultrafiltration (UF) membrane are highly desirable for sustainable wastewater treatment. This work reports a novel ZIF-67-imbedded PVDF (ZIF-67@PVDF) mixed-matrix UF membrane fabricated by nonsolvent-induced phase separation (NIPS) technique to reinforce efficient removal of dye wastewater via sulfate radical enhancement. The imbedded ZIF-67 well-dispersed within the membrane improved the membrane pore structure and benefited peroxymonosulfate (PMS) activation to generate sulfate radical that were confirmed by Electron spin resonance (ESR) spectroscopy. As a synergistic effect of pore structure and sulfate radical generation, the separation, antifouling and catalytic performance of the ZIF-67@PVDF membranes were greatly enhanced over a wide pH range. Even at a high pH of 11, the PMS on-line cleaning assisted ZIF-67@PVDF-1.0 membrane achieved high dye removal efficiency for orange Ⅱ (AO7, 97.3%), Methylene blue (98.2%), Rhodamine B (90.5%). The ZIF-67@PVDF membrane also showed good reusability and stability. This work demonstrates great potential of using self-cleaning UF membranes to treat dye wastewater.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Yongqing Wang,Zhiqiang Lan,Xiantun Huang,Haizhen Liu,Jin Guo
Using a deposition-reduction method, Mg/MOF nanocomposites were prepared as composites of Mg and metal-organic framework materials (MOFs = ZIF-8, ZIF-67 and MOF-74). The addition of MOFs can enhance the hydrogen storage properties of Mg. For example, within 5000 s, 0.6 wt%, 1.2 wt%, 2.7 wt%, 3.7 wt% of hydrogen were released from Mg, Mg/MOF-74, Mg/ZIF-8, Mg/ZIF-67, respectively. Activation energy values of 198.9 kJ mol −1 H 2 , 161.7 kJ mol −1 H 2 , 192.1 kJ mol −1 H 2 were determined for the Mg/ZIF-8, Mg/ZIF-67, Mg/MOF-74 hydrides, which are 6 kJ mol −1 H 2 , 43.2 kJ mol −1 H 2 , and 12.8 kJ mol −1 H 2 lower than that of Mg hydride, respectively. Moreover, the cyclic stability characterizing Mg hydride was significantly improved when adding ZIF-67. The hydrogen storage capacity of the Mg/ZIF-67 nanocomposite remained unchanged, even after 100 cycles of hydrogenation/dehydrogenation. This excellent cyclic stability may have resulted from the core-shell structure of the Mg/ZIF-67 nanocomposite.
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高影响因子
Sustainable Energy & Fuels
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2024
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IF 5
Mengqing Zhou,Changzhou Chen,Jie Jiang,Yajun Liu,Jianchun Jiang
Exploring lignin depolymerization and modification can yield high-value chemicals and liquid fuels, thereby enhancing resource utilization efficiency and alleviating pressure caused by energy shortages. In this paper, lignin-based carbon materials (Co-ZIF@KL-1 and Co-ZIF@KL-2) loaded with a metal–organic framework (ZIF-67) on kraft lignin biochar (KL) were prepared using two different methods (In situ method and traditional immersion method). In addition, catalysts with Co metal loaded on KL biochar (Co@KL) and ZIF-67 catalyst were also prepared for comparison with the above two different Co-ZIF@KL-1 and Co-ZIF@KL-2 catalysts. These catalysts were all applied to the hydrodeoxygenation (HDO) of guaiacol. Among them, the Co-ZIF@KL-1 catalyst exhibited the highest catalytic activity with 94.53% conversion of guaiacol and 83.86% selectivity of cyclohexanol under the optimal reaction conditions of 240 °C, 2.0 MPa N2, and 4 h. The superior catalytic performance can be attributed to its high surface area, strong stability, and appropriate acidic sites. Based on the distribution of catalytic products, pathways for the guaiacol HDO reaction are hypothesized. In general, ZIF materials and lignin composites offer substantial value for advancing biomass catalytic conversion in the future.
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高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Dongyin Li,Fuchao Yang,Xuan Shi,Guangyi Tian,Changhui Fu,Yifan Liu,Zhiguang Guo
In recent years, oil pollution and industrial organic pollutants discharge has become a major problem affecting the ecological and human living environment, and the removal of oil in oily wastewater is increasingly urgent, especially for emulsion separation. Therefore, it is crucial to develop efficient oil–water separation membranes with low cost, green sustainability, and ease of operation. Herein, an ingenious spraying hybrid coatings containing ZIF-67 (Zeolitic Imidazolate Framework-67) and polypyrrole (PPy) onto stainless steel mesh (SSM) and polyvinylidene fluoride (PVDF) was proposed. Through solidification and cooperative self-assembly to build rough structures, oil–water separation membranes ZIF-67@PPy SSM and ZIF-67@PPy PVDF have been obtained, which are hydrophilic and oleophilic in air and superoleophobic underwater. Depending on the scenario, on-demand separation of light oil/water mixtures and oil-in-water emulsions can be easily realized. The resulting oil–water separation membranes performed well that the separation efficiency of ZIF-67@PPy SSM can exceed 99.3% for all kinds of light oil/water mixtures, with a water flux of up to 66250 L/(m2·h), and maintains a separation efficiency of 98.5% even after 50 cycles. ZIF-67@PPy PVDF has a separation efficiency of more than 99.4% for various oil-in-water emulsions, and sustains outstanding performance despite undergoing 10 cycles. In addition, ZIF-67@PPy SSM and ZIF-67@PPy PVDF are sustainable in harsh environments, with good mechanical durability and some antimicrobial properties. The coatings prepared in this work that can be used for the separation of light oil/water mixtures and oil-in-water emulsions, and the proposed combination of multiple separation strategies are expected to improve the selectivity, improve efficiency, enhance contamination resistance, and increase accessibility of oil–water separation technologies.
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PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
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2024
·
IF 6.3
Mei Wan,Congling Shi,Lei Chen,Lei Deng,Yueping Qin,Honglei Che,Jingyun Jing,Junyi Li,Xiaodong Qian
Ammonium polyphosphate (APP) is the most commercially valuable phosphorus-based flame retardant, but poor interaction with the polymer interface limits the flame-retardant efficiency. In this work, a new type of multi-layered nanomaterial coating APP (APP-PEI@MXene@ZIF-67) was prepared and introduced into thermoplastic polyurethane (TPU) polymers by a simple and green assembly strategy. The effects of different loading shells of modified APP on the flame retardancy of TPU composites were investigated, as well as their gas/condensed phase thermal degradation products and their flame-retardant mechanisms. The results showed that APP-PEI@MXene@ZIF-67 was more favorable for catalytic char formation than APP, and the residual char formed by its composites was denser and more continuous. Compared with the pure TPU, the pHRR, THR, pSPR, and TSP of TPU/APP-PEI@MXene@ZIF-67–2BL composites were decreased by 72.75 %, 87.25 %, 59.58 %, and 85.97 %, respectively, which significantly reduced the heat and smoke release during the combustion process. The gas-phase and condensed-phase flame retardant mechanisms synergized to construct a possible approach to address the fire risk and heat/smoke hazards of TPUs and promote the extensive application of TPU polymers.
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高影响因子
Materials Today Chemistry
·
2025
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IF 6.7
Haozhe Li,Xiandie Zhang,Heng Xu,Xuxu Cui,Zhijie Fan,Zhen Liu,Xiaode Guo
The pursuit of high combustion performance and good mechanical properties is an urgent need for the development of composite solid propellants. Ammonium perchlorate/cobalt alginate/ZIF-67 (AP/Co-A/ZIF) composites were successfully synthesized by droplet and solution assembly method. The layered porous structure of Co-A increases the reaction site between AP and ZIF-67 so that is oxidized to produce Co 3 O 4 earlier, and further accelerate the heat release of the system. carbonized porous framework formed by the decomposition of Co-A has kind electrical and thermal conductivity, and makes Co 3 O 4 produced by the decomposition of ZIF-67 and Co-A well dispersed on the framework, achieving efficient charge transfer. The synergistic catalysis of Co-A/ZIF makes the low and high temperature decomposition stages of AP combine, which the high temperature decomposition temperature greatly reduced with a higher heat release. After being applied to AP-based propellants, the organic porous structure of Co-A shortens the heat transfer distance and plays an obvious combustion-supporting effect, while ZIF-67 accelerates the energy release rate to burn more violently, so that considerably improves the ignition capacity and combustion rate of the propellant. In addition, the reaction of Co-A and TDI effectively strengthens the interface interaction between AP and binder matrix, alleviates the dewetting phenomenon, and enormously improves the mechanical properties of the propellant. As an efficient composite nonmetallic combustion catalyst, Co-A/ZIF not only exhibits strong synergistic catalytic ability for propellant combustion, but also effectively improves the mechanical properties of the propellant. It provides a development direction for building a new catalyst to enhance the comprehensive performance of AP-based solid propellant.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12387-12398
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IF 2.7
Yafeng Jin,Fangming Han,Tao Wang,Haofu Shi,Xiaobo Li,Li Yang,Na Chen,Kaifeng Yang,Xinyue Song,Guangri Xu
Developing a facile and effective assay method is crucial due to the potential harm of metronidazole (MNZ) antibiotics to both human health and the environment. Herein, snowflake-shaped poly(3-thiophenemalonic acid, 3-TPA) combined with a carbonized core–shell-type ZIF-8@ZIF-67 (C-ZIF-8@ZIF-67) hollow polyhedra modified glassy carbon electrode (GCE), denoted as C-ZIF-8@ZIF-67/P3TPA/GCE, was fabricated by electropolymerization followed by the electrodeposition strategy. The resulting sensor demonstrates a significant electrocatalysis effect for the reduction reaction of MNZ, exhibiting a broad linear range (0.1–20, 20–800 μM) with a low limit of detection (LOD, 3S/N) of 0.024 μM. Furthermore, it has been successfully applied to determine MNZ in tablets and lake water. A synergistic effect between P3TPA and C-ZIF-8@ZIF-67 is elucidated through density functional theory (DFT) calculations. Consequently, this research introduces a sensitive and effective method for monitoring MNZ in real samples.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuqing Chai,Xuan Zhou,Gang Yuan,Wei Wang,Jingjing Zhang
ZIF-67-C 5 H 4 IN/MWCNT composites were successfully synthesized by doping 4-Iodopyridine (C 5 H 4 IN) and integrating multi-walled carbon nanotubes (MWCNT) IN cobalt dimethylimidazole (ZIF-67) via solvothermal and self-assembly methods. The composite was drop-cast on a glassy carbon electrode (GCE) for non-enzyme glucose detection IN alkaline media. The incorporation of C 5 H 4 IN modulated the three-dimensional metal-organic framework (MOF) structure of ZIF-67 and improved the molecular permeability, whereas the MWCNTs improved the electrical conductivity. As a result, the sensor offers excellent performance with a low limit of detection (LOD) of 0.78 μM, a linear range of 0.18–1.98 mM, and a sensitivity of 1033 μA mM −1 cm −2 . In addition, the sensor offers excellent stability, reproducibility and selectivity for common interferences.
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高影响因子
危险品化学品经营许可证（带存储）