CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Xueying Shan,Qixin Huang,Jiao Gao,Hanchao Liu,Jingru Wang,Jinchun Li
The design of low-smoke and low-toxicity epoxy resin (EP) composite materials remained a significant challenge. In this study, a multifunctional MOF-based flame retardant (TP-P-Co-MOF) was synthesized using ZIF-67 as the framework via a three-step modification process. TP-P-Co-MOF incorporated Schiff base-conjugated structures, Co P synergistic flame-retardant sites, and a porous architecture, while exhibiting excellent compatibility with EP. At a 4 wt% loading, the EP/TP-P-Co-MOF composite attained a UL-94 V-0 classification and an LOI of 31.3%. Additionally, in comparison with EP, the EP/TP-P-Co-MOF composite exhibited marked reductions in the peak heat release rate (PHRR), total heat release (THR), peak smoke production rate (PSPR), and total smoke production (TSP), which decreased by 43.1%, 14.9%, 64.0%, and 52.6%, respectively, thereby demonstrating outstanding flame-retardant efficiency and toxic-smoke suppression performance. Investigation of the flame-retardant mechanism indicated that TP-P-Co-MOF not only significantly improved the quality of the graphitized carbon layer in EP, but also reduces the concentration of combustible gases, thereby exerting synergistic flame-retardant effects in both the condensed and gas phases. With respect to mechanical properties, the incorporation of TP-P-Co-MOF improved both the toughness and strength of the EP. The tensile strength and impact strength increased by 11.1% and 24.7%, respectively, in comparison with neat EP. This study provided a promising strategy for developing highly efficient MOF flame retardants while offering a novel approach to designing low-smoke, low-toxicity flame-retardant EP.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Chengyuan Duan,Yi Feng,Yuming Xie,Meili Ding,Jianfeng Yao
A facile one-step synthetic strategy is proposed here to realize simultaneous amine-functionalized and Fe-doping modification of ZIF-8, aiming to optimize the Lewis acidic and basic properties of ZIF-8 for enhanced CO 2 adsorption and subsequent cycloaddition reaction of CO 2 and epichlorohydrin under solvent-free and relatively mild conditions (0.1 MPa and 80 °C). The obtained Fe-ZIF-8-NH 2 exhibits an improved CO 2 adsorption capacity of 63 mmol/g as compared to that of 18 mmol/g for pristine ZIF-8 and delivers a high catalytic CO 2 cycloaddition efficiency with the yield of target product of 92%, much higher than that of Fe-ZIF-8 (80%), ZIF-8-NH 2 (62%) and pristine ZIF-8 (40%). The improved performance can be attributed to the introduction of abundant –NH 2 groups and Fe-doping that enrich the Lewis acidity and basicity. Moreover, the obtained Fe-ZIF-8-NH 2 also exhibits high chemical stability and satisfactory recycling ability, which makes the obtained sample a promising catalyst for CO 2 capture and utilization.
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POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Yanlu Sun,Zhengqi Wang,Dequn Wu,Xueli Wang,Jianyong Yu,Ruchao Yuan,Faxue Li
The absence of flame retardant with suitable thermal feature and high flame retardancy has greatly limited the development of flame-retardant polyamide 6 (PA6). In this work, a phosphorus-containing flame retardant (CBPB) with appropriate flame responsive nitrile groups was synthesized, and its melting temperature, cross-linking temperature and initial degradation temperature exactly matched the thermal feature of flame retardant suitable for PA6. PA6/CBPB composites (FR-PA6s) were prepared by melt-blending various contents of CBPB into PA6 matrix. The UL-94 and limiting oxygen index (LOI) of FR-PA6s reached V-0 and 32.0% respectively once 8 wt% of CBPB was added to PA6 matrix. As a representative, FR-PA6-6 (6 wt% of CBPB in PA6 matrix) was successfully melt-spun into filaments with good mechanical properties. The filament strand was self-extincted within 4 s and only one droplet was generated after ignited in the vertical burning tests. The corresponding anti-dripping and flame-retardant mechanism were also explored. Suppression of melt-dripping of FR-PA6s was formed due to the chemical cross-linking of nitrile groups of CBPB at ∼290 °C, which significantly exceeded the general processing temperature of PA6 (∼260 °C) and so the processability of FR-PA6s was slightly affected. The enhanced flame resistance of FR-PA6s was contributed to the quenching effect of PO· and PO 2 · radicals as well as the diluting effect of NH 3 in the gas phase.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xinying Gong,Linyan Xu,Xiaoxue Kou,Juan Zheng,Yixin Kuang,Suxin Zhou,Siming Huang,Yu Zheng,Wei Ke,Gousheng Chen,Gangfeng Ouyang
The ubiquitous occurrence of perfluoroalkyl acids (PFAAs) in environmental water has drawn much attention due to their high persistence and bioavailability. However, it is difficult for the traditional adsorbents to extract PFAAs because of their unique hydrophobic and oleophobic properties. In this study, an amino-functionalized ZIF-8 (NH 2 -ZIF-8) was fabricated and used as the coating materials of the solid-phase microextraction fiber for the determination of PFAAs in water samples. The introduction of the amino group improved the extraction performance of PFAAs via electrostatic interaction and hydrogen bond, which exhibited better extraction efficiencies than those of ZIF-8 coated fiber and commercial fibers. The extraction efficiencies of PFAAs decreased with the increase of pH values, indicating that electrostatic interaction between the carboxylic acid group of PFAAs and the amino group of NH 2 -ZIF-8 played a dominating role in enrichment. The fabricated fiber coupled with high-performance liquid chromatography-triple quadrupole mass spectrometry (HPLC-MS/MS) was used for the detection of PFAAs in water samples, with a wide linear range (1–5000 ng L −1 ), low limits of detection (0.15–0.75 ng L −1 ), and good repeatability and reproducibility (1.9%-15.5%). The established method has been successfully applied in environmental water analysis, which provides a practical method for the determination of PFAAs in a convenient manner.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Rui Ding,Ziheng Li,Yan Dai,Xiangcun Li,Xuehua Ruan,Jiaming Gao,Wenji Zheng,Gaohong He
The amino functionalization of MOFs has been verified to be effective in improving the selective permeation of CO 2 . However, the introduction of amino groups into ZIF-8 by mixed ligands strategy is hard to achieve due to the high steric hindrance of benzene ring in 2-aminobenzimidazole ligand, resulting in insufficient content of amino groups. Therefore, in this work, polystyrene-acrylate (PSA) template is proposed to provide abundant adsorption and reaction sites for the rapid synthesis of NH 2 -ZIF-8 with high content of 2-aminobenzimidazole. Furthermore, the incomplete etching strategy is used to construct PSA modified hollow NH 2 -ZIF-8 nanospheres (PHNZ). Importantly, the thickness of PSA layer and the hollow size are adjusted by the etching time, as revealed by the SEM and TEM images. In this PHNZ, the modified PSA can provide good interface compatibility between PHNZ and Pebax matrix to enhance the CO 2 selectivity, while the hollow structure can reduce the mass transfer resistance and improve the gas permeability. Moreover, the introduced amino groups can enhance the CO 2 affinity of PHNZ and further improve the CO 2 /N 2 selectivity of the PHNZ-based mixed matrix membranes (MMMs). Benefiting from the synergy of good interface compatibility and enhanced CO 2 affinity from the amino groups, the PHNZ/Pebax MMMs present greatly improved CO 2 /N 2 selectivity in contrast with pure Pebax and NH 2 -ZIF-8 based membranes. Besides, as the etching time increases, the PHNZ-2 and PHNZ-3 based MMMs present a higher CO 2 permeability than that of NH 2 -ZIF-8 based MMM, revealing the significance of the hollow structure. The PHNZ-2/Pebax MMM with filler loading of 10 wt% expresses the best gas separation performance with the CO 2 permeability of 121.9 Barrer and CO 2 /N 2 selectivity of 96.6, respectively, showing an increase of 54.7 % and 98.0 % in contrast with pure Pebax membrane. Meanwhile, this CO 2 separation performance is far beyond the Robeson upper bound in 2008 and close to the McKeown upper bound in 2019, demonstrating that the proposed PHNZ displays a promising and competitive potential in MMM based CO 2 capture.
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高影响因子
Journal of CO2 Utilization
·
2022
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IF 8.321
Chengyuan Duan,Yuming Xie,Meili Ding,Yi Feng,Jianfeng Yao
Integrating dual Lewis acid and base as well as rational hierarchical pore structure in one catalyst is favorable to significantly boost the CO 2 cycloaddition reaction at mild conditions. In this regard, carbonized melamine sponge (CMS) featuring a highly porous network, rich nitrogen doping and excellent photothermal capability is employed as the ideal host for the construction of CMS@MOFs (namely, MIL-88-NH 2 and ZIF-8-NH 2 ) composites with diverse acid-base properties. Results show that all the obtained composites exhibited a satisfactory CO 2 adsorbing capacity (33–54 cm 3 /g) and delivered a remarkable yield of target cyclic carbonate at either mild thermal conditions (0.1 MPa CO 2 and 80 o C) or under light irradiation (light intensity: ~350 mW/cm 2 ) at room temperature. Even with diluted CO 2 (15 vol. % CO 2 ), high yields of 80–82 % are achievable. Moreover, the used catalysts can be easily recycled from reaction systems, leading to a good recyclability .
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yue Zhao,Teng Xu,Jin-He Zhou,Ji-Ming Hu
A superhydrophobic metal organic framework (MOF) nanocontainer strategy, other than conventional hydrophilic MOF nanocontainer process, was proposed for anticorrosion. Compared with the hydrophilic nanocontainers, the superhydrophobic MOFs have better compatibility with polyvinyl butyral (PVB) resin and provide reduced water absorption of the composite coating. In addition, the superhydrophobic property ensures slower release rate of encapsulated inhibitors from the nanocontainers. Thereby, the corrosion resistance of the PVB coating on copper substrates embedded with superhydrophobic MOF nanocontainers pre-loaded with 2-Amino-5-mercapto-1,3,4-thiadiazole (AMT) has been significantly improved. The molecular dynamics simulation was applied to understand the experimental results.
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Current Analytical Chemistry
·
2021
·Vol. 17
·期 7
·1027-1036
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IF 1.892
Qiao Dan,Deng Qiliang,Wang Shuo
Background: The approach for the determination of aminoimidazo-azaarenes (AIAs) is urgently required due to their mutagenic activity and potential carcinogenicity. For this purpose, a CdSe/ZnS quantum dots (CdSe/ZnS QDs)-embedded molecularly imprinted silica gel with high selectivity
and sensitivity was successfully prepared and applied to analyze such target. Methods: Herein, CdSe/ZnS QDs acted as the fluorescent probe, and molecularly imprinted silica gel as a recognition probe was synthesized on the surface of QDs via sol-gel method. 2- Aminobenzimidazole, which
has a similar structure with AIAs, as well as low cost and low toxicity, was selected as the dummy template. Results: The material has a high imprinting factor (IF=6.15); the linear range of CdSe/ZnS@MIP as a fluorescent sensing material for AIAs is 0.5-20.0 μg L-1
with the limit of detection (LOD) of 0.25 μg L-1 (3σ/s). Moreover, the fluorescent materials have been further applied to determine AIAs in beef floss and grilled fish fillet with satisfactory recoveries (82.8-110.8 %), and the relative standard deviation (RSD)
is < 5.5%. Conclusion: The proposed CdSe/ZnS QDs-embedded molecularly imprinted silica gel can be used to easily and selectively detect AIAs.
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ACS Sustainable Chemistry & Engineering
·
2021
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IF 8.198
Peng Hu,Hao Wang,Chao Xiong,Hao Liu,Jun Han,Jie Zhou,Zhenxia Zhao,Yongqing Wang,Hongbing Ji
We demonstrate a novel microwave-assisted strategy to in situ functionalize the node chemistry of Zr-based metal–organic frameworks (Zr-MOFs) with a 2-aminobenzimidazole (2-AMI) agent. The novel strategy can concomitantly weaken the Lewis acidity of Zr6O8 nodes of Zr-MOFs through bonding with 2-AMI, contributing to admirable surface hydrophobicity with an ultrahigh water contact angle of 151.7° and enhanced stability. The successful coordination process was jointly verified by thermogravimetry analysis, 1H nuclear magnetic resonance spectroscopy , and X-ray photoelectron spectroscopy analyses. Meanwhile, the tailor-made pore microenvironment enabled highly efficient CO2/CH4 separation via a synergetic equilibrium-kinetic effect. Gas adsorption isotherms and time-dependent kinetic profiles cooperatively reveal that UiO-66(N10%-Zr) exhibits an advanced ideal adsorbed solution theory selectivity of 326, an excellent diffusion selectivity of 60.7, and a dynamic selectivity of 195 for CO2/CH4 separation, confirming the unwanted equilibrium-kinetic effect. Breakthrough experiments and modeling simulations further confirm the enhanced hydrophobic nature and high CO2/CH4 separation performance of UiO-66(N10%-Zr) even under humid conditions. The node-based engineering strategy is here demonstrated to be highly effective for CO2/CH4 separation, providing a new direction to achieve advanced MOF structures with sustainable advantages including high adsorption capacity, high selectivity, and hydrophobicity, which are of crucial significance for industrial applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
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IF 10.588
Fan Xie,Yafang Wang,Longhai Zhuo,Doudou Ning,Ning Yan,Jiaoyang Li,Shanshan Chen,Zhaoqing Lu
Air pollutions are extremely serious threats to human health and the functional hybrid filter is able to remove complicated pollutants with great potential. However, the stable structure design of hybrid filter to provide efficient filtration and adsorption performance for high temperature applications still remains a challenge. In this study, electrospun polyimide (PI) based hybrid filter was fabricated via multiple hydrogen bonding self-assembly for high-temperature air purification . In particular, Octa(amino-propylsilsesquioxane) (POSS-NH 2 ) was utilized as “bridge” for the surface activation of PI fiber, and then amino-functionalized Zeolitic Imidazolate Framework-8 (NH 2 -ZIF-8) nanocrystals were anchored on the fiber surface through hydrogen bonding. On account of the synergistic effect of the interception effect of fibers and the electrostatic interaction of NH 2 -ZIF-8 nanocrystals, the as-obtained PI-POSS@ZIF hybrid filter possessed excellent filtration performance with a high PM0.3 removal efficiency of 99.28% and a low pressure drop of 49.21 Pa at high temperature of 280 °C. Moreover, due to the massive micropore structure, rich open metal sites and functional groups of NH 2 -ZIF-8, the hybrid filter exhibited prominent VOCs adsorption performance with adsorption capability of 89.95 mg/g for formaldehyde.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
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IF 7.183
Eryue Song,Kaifeng Wei,Haiqian Lian,Jingxian Hua,Hongxu Tao,Tingting Wu,Yichang Pan,Weihong Xing
Metal-organic frameworks (MOFs) used as molecular sieve membranes materials to gas separation has attracted much attention. However, the separation performance was also limited by its intrinsic flexibility of frameworks. Controlling its flexibility is still a big challenge. Herein, the doping of 2-aminobenzimidazole (ambz) into the ZIF-8 framework can obviously improve its original rigidity, which is due to the improved rigidity of the Zn‒N bond. Correspondingly, the high-quality doped ZIF-8 membrane for effective separation of C 3 H 6 /C 3 H 8 mixture were also fabricated. Compared with the permeation results on pure ZIF-8 membranes, the ambz-doped ZIF-8 membrane exhibited two specific transportation performance improvements. The first was that drop extent of C 3 H 6 /C 3 H 8 selectivity on the doped ZIF-8 membrane with the increase in feeding pressure was decreased, and the selectivity was also irreversible as the feeding pressure was released. This phenomenon was attributed to improved rigidity of the framework. The second was that the C 3 H 6 permeance was almost independent on the permeating temperature, which was also totally different with that on the pure ZIF-8 membrane, resulting from the significant change of adsorptive heat and diffusion energy of propylene on the ambz-doped ZIF-8 membrane. Therefore, this ambz-doped ZIF-8 membrane is promising in real world C 3 H 6 /C 3 H 8 separation.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
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IF 4.551
Jie Gao,Haizhuo Mao,Hua Jin,Chen Chen,Armin Feldhoff,Yanshuo Li
Membrane-based separation technology has evolved as a competitive approach for CO 2 capture from flue gas (mainly N 2 ). To achieve high separation performance, three partially NH 2 -, OH- and CH 3 OH- functionalized mixed-linker-ZIF-7 were successfully synthesized, and incorporated into polyether-block-amide (Pebax® 2533) polymer to form mixed-matrix membranes (MMMs). As evidenced by the CO 2 adsorption isotherms , introducing functional groups in the ZIF-7 framework was indeed beneficial for CO 2 adsorption. All MMMs composed of ZIF-7-NH 2 , ZIF-7-OH and ZIF-7-CH 3 OH offered better CO 2 /N 2 separation performance than the parent ZIF-7-Pebax® 2533 membrane, suggesting the positive effect of functionalized ZIF-7 fillers on the gas separation performance. Among the three functionalized ZIF-7 based MMMs, the ZIF-7-OH-Pebax MMMs exhibited the best performance for CO 2 /N 2 separation, which might be ascribed to the highest adsorption selectivity of CO 2 over N 2 predicted by ideal adsorbed solution theory (IAST) for ZIF-7-OH fillers. The 14% ZIF-7-OH-Pebax MMM showed high CO 2 permeability of 273 Barrer and CO 2 /N 2 separation factor of 38, which increased by 60% and 145% as compared with the neat Pebax membrane. The strategy of preparing functionalized MOFs with strong affinity for CO 2 provides an effective method to develop MMMs for highly efficient CO 2 separation.
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