CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 18
·6879-6887
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IF 5.731
Fei Pang,Mingyuan He,Jianping Ge
Graphical Increasing attraction : Fe 3 O 4 /zeolite imidazolate framework (ZIF-8) nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate (MeIM) and zinc nitrate in the presence of Fe 3 O 4 nanocrystals (see figure; PAA=polyacrylic acid). The particles have a superparamagnetic response and can be separated by means of a magnetic field and redispersed into the solution after withdrawal of the field. Fe 3 O 4 /ZIF-8 nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate and zinc nitrate in the presence of Fe 3 O 4 nanocrystals. The particle size, surface charge, and magnetic loading can be conveniently controlled by the dosage of Zn(NO 3 ) 2 and Fe 3 O 4 nanocrystals. The as-prepared particles show both good thermal stability (stable to 550 °C) and large surface area (1174 m 2 g −1 ). The nanoparticles also have a superparamagnetic response, so that they can strongly respond to an external field during magnetic separation and disperse back into the solution after withdrawal of the magnetic field. For the Knoevenagel reaction, which is catalyzed by alkaline active sites on external surface of catalyst, small Fe 3 O 4 /ZIF-8 nanoparticles show a higher catalytic activity. At the same time, the nanocatalysts can be continuously used in multiple catalytic reactions through magnetic separation, activation, and redispersion with little loss of activity.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 12
·4279-4286
·
IF 2.5
Zhou Jianhua,Niu Zhuanli,Xiao Anguo,Li Xiang
Materials with passive daytime radiative cooling (PDRC) have drawn more attention as a result of their potential for energy savings. We prepared SiO 2 -encapsulated ZnO@ZIF-8 (ZZS) particles and a radiative cooling coating containing ZZS particles. Owing to the polyhedron structure and the phonon-polarization resonance of ZZS particles, the ZZS fabric coating could reflect sunlight with 83% and radiate heat to outer space with 0.96. Compared with the ambient air, its average temperature decreased by 6.4 °C, and the human body under direct sunlight could avoid overheating 3.9 °C. In addition, the ZZS coated fabric after rubbing still had good PDRC and its average temperature increased by 1.38℃ higher than the original ZZS coated fabric. Owing to good PDRC property, hydrophobicity, mechanical properties and simple methods, the widespread usage of ZZS coated fabric for personal thermal management appears to be promising.
研究领域:
材料科学
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能源工程
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2025
·
IF 2.4
Ke Yang,Sisi Cheng,Shijia Li,Kun Zhu,Ziqin Yao
The influencing factors of ZIF-8 synthesis were systematically investigated by the green synthesis method and the samples were also compared with ZIF-8 synthesized in other ways, and an optimal synthesis route was found by exploring the synthesis conditions. On this basis, the synthesis mechanism of ZIF-8 was analyzed. The research results show that the key influencing factors in the reaction process are the amount of NaOH and the pH value of the system. Different amounts of NaOH will produce different intermediates, and these intermediates further affect the pH value of the entire reaction system. The pH value of the system plays a decisive role in the deprotonation process of the ligand in the reaction, and this process is the key to whether the ZIF-8 structure can be formed. It is worth mentioning that the ZIF - 8 synthesized in this study demonstrates varying removal performances for different dyes under different conditions. Under specific conditions, it exhibits the maximum removal rate for Rhodamine B (RhB), reaching 99.97 %. This excellent removal performance is closely associated with the pore - structure characteristics of the synthesized material, which fully indicates that the ZIF - 8 synthesized through the green route has certain application potential and promising application prospects in related fields.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Ting Su,Hongxia Shang,Xinru Su,Zhixian Sun,Yuehan Li,Linwen Li,Zhen Zhang,Renyong Geng,Shuisheng Chen
In this investigation, a hydrogel adsorbent featuring remarkable efficiency in dye adsorption was successfully synthesized by the integration of natural polysaccharide (pullulan) and nanoparticles (ZIF-8@PDA). The prepared natural polysaccharide nanocomposite hydrogels not only exhibit superior mechanical strength and biocompatibility, but also demonstrate adeptness in the removal of dye pollutants. The dye removal capacities were 615.4 mg/g for malachite green (MG) and 525.8 mg/g for Congo red (CR), respectively. Notably, the adsorption process exhibits minimal susceptibility to variations in water quality and the presence of co-existing ions. The pH-responsive surface charge conversion capability of the adsorbent renders it recyclable, maintaining a dye adsorption performance exceeding 88 % even after 5 cycles of repeated usage. Overall, these environmentally friendly natural polysaccharide nanocomposite hydrogels hold potential for addressing complex wastewater treatment challenges and long-term use.
研究领域:
材料科学
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环境科学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 8
·1150
·
IF 4.7
Xinchao Wang,Jiale Hu,Jiajia Liu,Yixin Liang,Lan Wu,Tie Geng,Shihua Liu,Yonggang Guo
Polyether ether ketone (PEEK) is esteemed as a high-performance engineering polymer renowned for its exceptional mechanical properties and thermal stability. Nonetheless, the majority of polymer-based lubricating materials fail to meet the contemporary industrial demands for motion components regarding high speed, heavy loading, temperature resistance, and precise control. Utilizing 3D printing technology to design and fabricate intricately structured components, developing high-performance polymer self-lubricating materials becomes imperative to fulfill the stringent operational requirements of motion mechanisms. This study introduces a novel approach employing 3D printing technology to produce PEEK with varying filling densities and conducting in situ synthesis of zeolitic imidazolate framework (ZIF-8) nanomaterials on its surface to enhance PEEK’s frictional performance. The research discusses the synthetic methodology, characterization techniques, and tribological performance evaluation of in situ synthesized ZIF-8 nanomaterials on PEEK surfaces. The findings demonstrate a significant enhancement in frictional performance of the composite material under low-load conditions, achieving a minimum wear rate of 4.68 × 10−6mm3/N·m compared to the non-grafted PEEK material’s wear rate of 1.091 × 10−5mm3/N·m, an approximately 1.3 times improvement. Detailed characterization and analysis of the worn surface of the steel ring unveil the lubrication mechanism of the ZIF-8 nanoparticles, thereby presenting new prospects for the diversified applications of PEEK.
研究领域:
材料科学
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表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Jiaojiao Luo,Yifan Liang,Jian-Ying Lin,Huiling Fan
Bacterial infections pose a significant threat to global public health, and the presence of bacterial biofilms complicates the treatment of these infections. Therefore, the development of materials with both antibacterial and antibiofilm properties is crucial. In this study, we designed a composite material that combines chemical and photothermal antibacterial functions using a zeolitic imidazolate framework (ZIF-8) and protocatechuic acid (PCA). PCA-ZIF was synthesized by immersing ZIF-8 in a PCA solution, followed by surface encapsulation with polydopamine (PDA) through dopamine polymerization to enhance its photothermal therapy potential. This process yielded PCA-ZIF@PDA, which can generate localized hyperthermia and gradually release PCA to achieve multimodal antibacterial activity. The structure of the composite was characterized using XRD, FTIR, SEM, and BET, and its photothermal performance under 808 nm laser irradiation, drug release profile, and in vitro antibacterial efficacy were also evaluated. The results indicated that the immersion of PCA did not alter the crystal structure of ZIF-8, however, the polydopamine (PDA) coating significantly reduced its crystallinity. The PCA loading capacities were measured at 253.7 mg⋅g −1 for PCA-ZIF and 209.2 mg⋅g −1 for PCA-ZIF@PDA. The photothermal conversion efficiency of the 1 mg⋅mL −1 sample under 808 nm irradiation was found to be 61.4 %. Under near-infrared irradiation and acidic conditions (pH 5.0), the cumulative drug release from PCA-ZIF@PDA reached 91 % after 12 h. Antibacterial experiments demonstrated that PCA-ZIF@PDA effectively killed E. coli and S. aureus , inhibited their growth, and significantly prevented biofilm formation.
研究领域:
材料科学
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微生物学
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药理学
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产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2021
·Vol. 86
·期 8
·3550-3562
·
IF 3.167
Ying Cai,Jingwei Guan,Wen Wang,Li Wang,Jianyu Su,Liming Fang
Food packaging materials, especially biodegradable polymer composites incorporated with natural antimicrobial agents with excellent antibacterial activities, are in high demand and attracted immense attention. Herein, a polycaprolactone/curcumin@zeolitic imidazolate framework-8 (PCL/Cur@ZIF-8) composite film with enhanced antibacterial activity was developed. Curcumin, a natural photosensitizer, was loaded in the highly porous nanocrystals ZIF-8 to improve its poor water solubility and stability. The integral structure of Cur@ZIF-8 was maintained well in the PCL matrix even at the highest loading of 35% (w/w), and all composite films had good light transmittance at 420–430 nm. The PCL/Cur@ZIF-8 composite films responded to the acidic growth environment of bacteria by releasing zinc ions and curcumin molecules. Furthermore, upon blue light irradiation (420–430 nm, 2.2 mW/cm 2 ), curcumin molecules generated singlet oxygen. With the synergistic effects of zinc ions and singlet oxygen, the composite films exhibited a 99.9% reduction of Escherichia coli and Staphylococcus aureus strains when the amount of Cur@ZIF-8 loading was more than 15% (w/w), as well as a strong anti-adhesion effect on bacteria. Moreover, bacterial resuscitation tests indicated that the composite films exhibited 99.9% reduction in the adhered bacteria population through treatment with photodynamic sterilization. This is the first study presenting that the incorporated curcumin ZIF-8 nanoparticles in the matrix of polymer are pH and light responsive for anti-adhesion of bacteria, which is of great potential application as antibacterial packaging material for the food industry. Practical Application A novel, biodegradable, pH, and light-responsive composite film was developed for antibacterial activity. Natural photosensitizer curcumin was encapsulated in ZIF-8 nanocrystals (Cur@ZIF-8) as the antimicrobial agent. With the synergistic effects of Zn 2+ and singlet oxygen, the composite film exhibited a 99.9% reduction of Escherichia coli and Staphylococcus aureus strains, and a strong anti-adhesion property toward bacteria. This composite film is of great potential application as an antibacterial packaging material that enhances the shelf life of fruits, meat, and so on.
研究领域:
食品科学
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材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Zhen Pei,Pengfei Fei,Aiqin Zhang,Jiandong Guo,Jiacheng Hao,Jing Jia,Hailiang Dong,Qianqian Shen,Liqiao Wei,Husheng Jia,Bingshe Xu
ZIF-8 has excellent antibacterial potential as an important metal organic framework (MOFs) photocatalytic material. However, ZIF-8 is greatly restricted in photocatalytic antibacterial applications due to the wide band gap and only response to ultraviolet light. In this work, the spectral response of ZIF-8 is successfully extended to the visible light region by the thermal gas sensitization treatment technology. Meanwhile, the forbidden band width of the materials is narrowed by about 47%. The results of FTIR, XPS and EDS prove that the elements and functional groups in ZIF-8 have changed, indicating the completion of the thermal gas sensitization reaction. The results of XRD and SEM show that the modification process doesn’t change the crystal structure and morphology of ZIF-8; The result of BET demonstrates that the specific surface area of ZIF-8 decreases slightly after sensitization, but it is still as high as about 1500 m²/g. Photocatalysis studies indicate that the photo-generated charge separation and transfer efficiency of ZIF-8 improve significantly and the recombination reduce substantially after thermal oxygen sensitization. Photocatalytic antibacterial performances reveal that ZIF-8 after thermo-oxygen sensitization can rapidly produce active species such as·O 2 - and h + under visible light irradiation, and the bactericidal efficiency exceed 99% against Escherichia coli and Staphylococcus aureus within 20 min. This research provides scientific basis and experimental data for the application of ZIF-8 in microbial management and health protection.
研究领域:
材料科学
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微生物学
·
光催化技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Zhihao Si,Di Cai,Shufeng Li,Changwei Zhang,Peiyong Qin,Tianwei Tan
Recently, zeolitic imidazolate framework-8 (ZIF-8) has been recognized as one of the most potential doping particles for pervaporation separation of organics because of its unique pore structure and high surface area. However, in this work, ZIF-8-based mixed matrix membrane (MMM) was found to have poor stability in separating acetone-butanol-ethanol (ABE) fermentation broth due to the organic acids caused the degradation of ZIF-8 framework. To improve the stability of ZIF-8-based MMM in practical application, ZIF-8-derived nanoporous carbon (ZNC) was prepared via direct carbonization and used to replace ZIF-8 in MMM. Results indicated the acid-stability, specific surface area and pore volume of ZNC were all remarkably improved compared with those of ZIF-8. The ZNC-based MMM showed high hydrophobicity and good compatibility between particles and polymer. More attractively, during 100 h of continuous operation for ABE recovery from fermentation broth, ZNC incorporated MMM exhibited a stable performance with an average total flux of 1870 g m −2 h −1 and a n -butanol separation factor of 20.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Long Zhou,Na Li,Xiaoying Jin,Gary Owens,Zuliang Chen
A n Fe@ZIF-8 composite, which combined the tailorable porosity of ZIF-8 with the versatile functionality of Fe nanoparticles ( n Fe), was synthesized for Pb(II) removal. Batch adsorption experiments showed that more than 95.3% of Pb(II) was removed from aqueous solution at an initial concentration of 50 mg L −1 when using n Fe@ZIF-8 within 60 min at pH value of 5. The mechanism of Pb(II) removal was studied via characterization of changes the morphology, size and composition of in n Fe@ZIF-8 before and after exposure the solutions containing Pb(II). Specifically, Fourier transform infrared (FTIR) and X-ray powder diffraction (XRD) indicated that n Fe@ZIF-8 was successfully synthesized and also remained stable after Pb(II) removal. Transmission Electron Microscope (TEM) and Scanning electron microscopy-X-ray energy dispersive spectrometer (SEM-EDS) both confirmed that Pb(II) was partially adhered onto the surface of n Fe@ZIF-8, where X-ray photoelectron spectroscopy (XPS) specifically revealed the existence of Pb(0) on the surface. This indicated that Pb(II) was initially adsorbed onto the surface of n Fe@ZIF-8 and subsequently reduced to Pb(0). Moreover, Pb(II) removal fit well to kinetics of absorption and reduction. Finally, in practice, n Fe@ZIF-8 could remove 96.3% of Pb(II) from an electroplating wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Siyu Wang,Laiyu Luo,Zhihui Li,Chengxu Jin,Nan Wang,Dongxu Wang,Aiping Wu,Haijing Yan,Lei Wang,Chungui Tian
The removal of the pollutants from the environment is the need of the environmental protection. ZIF-8 is promising adsorbents, and the construction of ZIF-8 assembly is essential to boost its performance. Here, we showed the easy synthesis of two-dimensional (2D) assembly built by ZIF-8 particles (2D A-ZIF-8) for the high-efficient capture of the iodine (I 2 ) and dyes. The assembly was synthesized by the controllable reaction of 2-methylimidazole (2-MIM) with 2D Zn-glycerol (Zn-GL) precursor. Time-dependent experiments showed the predominant replacement of GL at outer boundary and then basic plane of the precursor by 2-MIM. The assembly can be synthesized with high output and combined the advantage of large accessible surface of 2D sheets, the plentiful pores of ZIF-8 and enhanced stability of assembly, endowing the large potential as adsorbent. The high adsorption capacity of I 2 (200 wt%) was achieved on A-ZIF-8, while it is about 128 wt% on traditional dodecahedronal ZIF-8. The assembly also showed the excellent adsorption capacity for methyl orange (MO) (46.3 mg g -1 ) and methylene blue (MB) (46.5 mg g -1 ) at a concentration of 50 mg L -1 . It can be easily separated for reuse benefited from the large size and enhanced stability of assembly.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Ru Jia,Fugui Xiao,Qiaofang Fu,Ying Wu
BiOI was modified with poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS) to function as an organic hole conductor, thereby accelerating the transfer of light-generated holes. Subsequently, the catalyst was immobilized on ZIF-8 to enhance the contact area between the active sites of the catalyst and the pollutant. The successful preparation of the ZIF-8@BiOI/PEDOT:PSS was confirmed through various characterizations. Compared to pure BiOI, the ZIF-8@BiOI/PEDOT:PSS composite material demonstrates markedly enhanced visible-light-driven photocatalytic activity in the degradation of Rhodamine B (RhB) dye. The ZIF-8@BiOI/PEDOT:PSS composite photocatalyst exhibits a maximum RhB degradation efficiency of 92.64%, with a degradation rate constant (k) approximately 2.9 times higher than that of pure BiOI. Additionally, the ZIF-8@BiOI/PEDOT:PSS also exhibits outstanding photocatalytic performance in the degradation of methylene blue and methyl orange. Moreover, its catalytic activity remains nearly unchanged after five consecutive reuse cycles, demonstrating excellent recyclability. This study presents a novel strategy for improving the photocatalytic performance of such materials.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）