JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2024
·Vol. 30
·期 4
·1039-1051
·
IF 3.8
Yujie Yang,Xiaodong Qiao,Xinpeng Fan,Shuangquan Liao,Zhenfan Sun
Zinc oxide (ZnO) is widely used as an activator in the vulcanization process of natural rubber. However, due to its poor compatibility with natural rubber, a large amount of ZnO needs to use, and the unreacted ZnO can precipitate in various ways, posing significant harm to aquatic organisms and microorganisms. Therefore, it is necessary to reduce the dosage of ZnO in order to minimize its environmental impact. In this study, we applied ZIF-8, a zinc-based metal–organic framework, as a vulcanization additive in natural rubber. and it was found that ZIF-8 could promote the rubber vulcanization reaction by adsorbing sulfur, promoting sulfur ring-opening, and providing different ligand interactions of Zn 2+ . Moreover, even at low usage levels of ZIF-8, it effectively reduces the amount of ZnO while simultaneously improving the mechanical properties of the samples. This work provides an effective method to reduce the amount of ZnO without sacrificing the rubber properties and provides a new idea for the application of ZIF-8 in rubber materials. Highlights ZIF-8 enhances properties of natural rubber composites with low ZnO dosages. Revealing the reason why ZIF-8 promotes the vulcanization of natural rubber. Investigation of the effect of ZIF-8 on the vulcanization properties of natural rubber.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Chunxin Jin,Shuai Liu,Xiaofang Chen,Yanhong Li,Jürgen Caro,Aisheng Huang
Optimal orientation is the key factor to optimize the gas separation performance of metal-organic framework (MOF) membranes. However, it is still greatly challenging to prepare large-area oriented MOF membranes for industrial applications. Herein, we prepared compact and (100) oriented zeolitic-imidazolate framework-8 (ZIF-8) membranes with membrane area up to 500 cm 2 on the graphite substrate via support-induced strategy within 2 h. With membrane thickness of only 620 nm, the (100) oriented ZIF-8 membranes exhibit high gas separation performances due to the reduction of inter-crystalline defects and permeation resistance. At 100 °C and 1 bar, the separation factors of H 2 /CO 2 , H 2 /CH 4 and H 2 /C 3 H 8 are 18.5, 58.2 and 101.6, respectively, with H 2 permeance of about 160 x 10 −9 mol m −2 s −1 ·Pa −1 . The different positions of the 500 cm 2 ZIF-8 membrane show complete consistency in orientation and separation performance, recommending this membrane suitable for future industrial applications. Further, also oriented ZIF-67 and MOF-303 membranes can be consistently prepared by this strategy, confirming its versatility for the preparation of large-area MOF membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhaohao Li,Tianjing An,Jiaxi Yang,Dan Gao,Hongyuan Zhang,Heng Zhang
Capturing CO 2 from the flue gas in the power plant is an important measure to realize the low-carbon combustion of the fossil energy. This paper presents a novel technique which combines traditional methods of the chemical absorption, the physical adsorption and the membrane absorption. The ionic liquid ([TEPA][MIm]) is utilized to improve the CO 2 absorption performance and reduce the energy consumption. While the porous skeleton (ZIF-8) is added to the ionic liquid to reduce the viscosity while introducing the physical adsorption. Moreover, the hydrophobic ceramic membrane is utilized as the separation interface between the gas phase and the liquid phase, which can avoid the entrainment and overflow of the liquid phase while increasing the specific surface area. In terms of the material preparation and the characterization, the addition of ZIF-8 does not destroy the original chemical composition of [TEPA][MIm]. The average contact angle of the hydrophobic ceramic membrane is 140.55°, and the failure temperature is greater than 400 K, which conforms to the application situation of the power plant. In terms of the CO 2 capture and the desorption performance, the maximum CO 2 capture amount reaches 2.03 mol/mol. The temperature of complete desorption is 70 °C. Furthermore, the capture performance after five cycles can reach 80 % of the initial performance. The performance is better than that of the CO 2 capture technology utilizing the traditional monoethanolamine solution.
研究领域:
能源与环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Rongzhi Chen,Kuo Zhan,Yayue Wu,Yabin Zhu,Jun Yan,Bin Liu,Yunlin Chen
The extensive use of hypochlorite (ClO − ) as oxidant and bleach has drawn serious concern due to their adverse environment and biological impact. Herein, a novel fluorescence probe composite material based on MAPbBr 3 @ZIF-8 was prepared by agitation method in room temperature , using lead bromide, armour ammonia bromine, 2-methylimidazole and zinc acetate as precursors. MAPbBr 3 @ZIF-8 composites exhibited remarkable stability in NaCl aqueous solution and UV lamp. Thus, the MAPbBr 3 @ZIF-8 composites were successfully used as a fluorescence probe for detection of ClO − via electron transfer and dynamic quenching mechanism. The fluorescence probe can detect ClO − in water with high selectivity even existed other anions (HCO 3 − , SO 4 2− , Cl − , SiO 3 2− , CO 3 2− , NO 3 − , HSO 3 − ). Meanwhile, the response time of the MAPbBr 3 @ZIF-8 probe could be obtained to less than 40 s. The detection limit and quenching constant were calculated as 31.9 nM and 0.141 µM −1 . Furthermore, the fluorescence probe sensor showed excellent stability in natural environment with 94.6%-100.6% recovery rates. The fluorescence probe based MAPbBr 3 @ZIF-8 composites in this study is promising for detecting ClO − anion in water.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Yingying Liu,Guowen Zhang,Ni Zeng,Song Hu
8-Methoxypsoralen (8-MOP) is a naturally occurring furanocoumarin with various biological activities. However, there is little information on the binding mechanism of 8-MOP with trypsin. Here, the interaction between 8-MOP and trypsin in vitro was determined by multi-spectroscopic methods combined with the multivariate curve resolution-alternating least squares (MCR–ALS) chemometrics approach. An expanded UV–vis spectral data matrix was analysed by MCR–ALS, the concentration profiles and pure spectra for the three reaction species (trypsin, 8-MOP and 8-MOP–trypsin) were obtained to monitor the interaction between 8-MOP and trypsin. The fluorescence data suggested that a static type of quenching mechanism occurred in the binding of 8-MOP to trypsin. Hydrophobic interaction dominated the formation of the 8-MOP–trypsin complex on account of the positive enthalpy and entropy changes, and trypsin had one high affinity binding site for 8-MOP with a binding constant of 3.81 × 10 4 L mol − 1 at 298 K. Analysis of three dimensional fluorescence , UV–vis absorption and circular dichroism spectra indicated that the addition of 8-MOP induced the rearrangement of the polypeptides carbonyl hydrogen-bonding network and the conformational changes in trypsin. The molecular docking predicted that 8-MOP interacted with the catalytic residues His57, Asp102 and Ser195 in trypsin. The binding patterns and trypsin conformational changes may result in the inhibition of trypsin activity. This study has provided insights into the binding mechanism of 8-MOP with trypsin.
研究领域:
生物化学
·
药理学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.083
Yaqiong Zhu,Qian Liu,Aisheng Huang
The separation of CO2/CH4 is reported in detail by using zeolitic imidazolate framework (ZIF-8) membrane which was prepared on 3-aminopropyltriethoxysilane modified Al2O3 tube through microwave heating synthesis. Attributed to the preferential adsorption affinity of CO2 over CH4 and a narrow pore window of 0.34 nm, the ZIF-8 membrane shows high separation performances for the separation of CO2/CH4 mixtures. For the separation of equimolar CO2/CH4 mixture at 100°C and 2 bar feed (1 bar permeate) pressure, a CO2 permeance of 1.02 × 10−8 mol/m2· s· Pa and a CO2/CH4 selectivity of 6.8 are obtained, which is promising for CO2 separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Jia Liu,Bin Yang,Shiyue Niu,Xin Liu,Xian Wang,Liqian Niu,Shuyun Bi
At present, the application range of tetracycline (TCs) is very wide, and excessive residue will pose a threat to the health of consumers. However, there is a lack of methods more suitable for on-site detection. In order to ensure food safety, CdS@ZnS QDs and zeolitic imidazolate framework-8 (ZIF-8) were hybrid to obtain the composite CdS@ZnS QDs@ZIF-8, which was used as fluorescent probe to establish real-time methods for the detection of minocycline (MC) and doxycycline (DC). The quantum yield (QY) of the prepared composite CdS@ZnS QDs@ZIF-8 was 20.76 %. The MC/DC quenched the fluorescence of CdS@ZnS QDs@ZIF-8 in a static manner, which was confirmed by Stern-Volmer and time-resolved fluorescence analysis. The binding constant at 293 K was obtained and electrostatic force was found to play a leading role in the two binding processes. The optimal pH, contact time and temperature for the determinations were obtained. The interferences of some common metal ions, glucose, BSA, DNA, HSA and tryptophan on the detections were investigated. The linear relationship between the concentration of MC/DC and the fluorescence intensity ratio was established. The limits of detection (LODs) were 10.06 and 11.24 ng mL −1 (3 S 0 / S ) for MC and DC. The methods were successfully applied to the detection of MC and DC in egg samples with good recovery and precision.
研究领域:
食品安全
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Yixin Chen,Zexi Chen,Sheng Chu
Metal–organic frameworks (MOFs) hold significant potential for applications in gas adsorption and separation, catalysis, chemical sensing, and drug delivery. Zeolitic imidazolate frameworks (ZIFs) are a type of MOF composed of metal ions and imidazolate ligands, structurally similar to zeolite structures. ZIF-8, a widely studied ZIF material, is composed of zinc ions (Zn2+) and 2-methylimidazole as fundamental building blocks featuring unique porous structures, a high specific surface area, and excellent thermal and chemical stability. This study introduces a rapid room-temperature synthesis method for bimetallic ZIF-8 through the hydroxide double salt (HDS) precursor. Various characterization techniques confirmed that the synthesized bimetallic ZIF-8 exhibits uniform particle size and high crystallinity. Experimental results indicate that the HDS precursor provides numerous active sites, facilitating rapid nucleation and resulting in uniformly sized bimetallic ZIF-8 particles. By optimizing the ultrasonic time of HDS, the concentration of 2-methylimidazole, and the reaction time, the synthesis conditions were refined, producing bimetallic ZIF-8 particles with an average size of 135.0 nm and a minimum polydispersity index (PDI) of 0.024. Additionally, the copper ion adsorption performance was evaluated, with the synthesized bimetallic ZIF-8 showing the highest adsorption capacity of 1196.82 mg/g at pH 6, demonstrating its effectiveness in heavy metal removal.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Linsong Luo,Xiao Han,Xiaoyan Dong,Qinghong Shi,Yan Sun
The growth of biodiesel and oleochemical industries results in substantial surpluses of glycerol and consistently low prices. To absorb this surplus, we report a polymer-assisted in situ enzymes encapsulation strategy in which glycerol dehydrogenase (GDH) is encapsulated with polyvinylpyrrolidone (PVP) and cysteine (Cys) within ZIF-8 for glycerol conversion. The results showed that the encapsulated GDH/ZIF-8 composites presented stronger substrate affinities and higher catalytic efficiencies than free GDH as well as good stability. Among the free GDH and GDH/ZIF-8 composites, GDH/Cys/PVP@ZIF-8 presented the highest relative activity of 300.7 %. This could be attributed to the structural evolution of the encapsulated GDH and the formation of a more hydrophilic microenvironment around GDH during complexation with PVP. To increase cofactor utilization, a cofactor self-sufficient cascade system was constructed by encapsulating GDH and forming H 2 O NADH oxidase (Nox) with PVP and Cys within ZIF-8 for the conversion of glycerol to 1,3-dihydroxyacetone (DHA). At the optimal GDH:Nox molar ratio (4:1) and a substrate concentration of 100 mM, the DHA yield reached approximately 4.2 mM in GDH-Nox/Cys/PVP@ZIF-8, and the total turnover number of GDH-Nox/Cys/PVP@ZIF-8 reached 2787 at 0.05 µM NAD + , indicating its feasibility for large-scale DHA production. This work has thus provided a promising procedure of co-immobilizing enzymes via Cys/PVP-assisted in situ encapsulation within ZIF-8 for the development of economically viable multienzyme biocatalysts for glycerol conversion.
研究领域:
生物化学
·
工业生物技术
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Matteo Ciprian,Peng Xu,Somboon Chaemchuen,Rong Tu,Serge Zhuiykov,Philippe M. Heynderickx,Francis Verpoort
For the first time, MoO 3 nanoparticles (NPs) with a size ranging from 1.5 to 60 nm were deposited on spray dried zeolitic imidazolate framework-8 (ZIF-8) by rotary chemical vapor deposition (RCVD) in order to improve its photocatalytic performance. A direct effect of the deposition time on the metal oxide loading was observed. In a time frame between 0.9 and 2.7 ks the metal oxide loading can be increased from 1 to 3 wt%. All the MoO 3 -NPs/ZIF-8 catalysts were tested towards the methylene blue photodegradation using sunlight. MoO 3 -NPs/ZIF-8 3 wt% RCVD reached a conversion of 82% and 95% after 180 and 300 min, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2025
·Vol. 13
·期 9
·342
·
IF 3.7
Juncheng Chen,Caizhang Wu,Zhike Zhao,Ruihao Xue
An electrochemical aptamer sensor for the sensitive detection of aflatoxin B1(AFB1) in corn samples was developed using nanocomposites loaded with copper nanoparticles (CuNPs) on zeolitic imidazolate framework-8 (ZIF-8), which were modified on a glassy carbon electrode (GCE). The CuNPs@ZIF-8 nanocomposites served as modifying materials for electrodes, exhibiting a high specific surface area and excellent compatibility with aptamers, thereby enhancing the electron transfer rate and increasing the aptamer loading and immobilization efficiency. The electrochemical properties before and after modification were investigated and validated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques, while the sensor’s performance was analyzed through quantitative detection via differential pulse voltammetry (DPV). Furthermore, various conditions, including the volume of ZIF-8 dispersion, electrodeposition time of copper nanoparticles, aptamer concentration, and AFB1incubation time, were optimized. The results indicated that the sensor exhibited a wide linear range (10.0 to 1.0 × 106pg/mL), with a lower limit of detection (LOD) of 1.13 pg/mL under optimized conditions, outperforming other reported aptamer sensors. The spiked recoveries in corn samples ranged from 96.663% to 105.72%. In conclusion, this sensor presents a novel solution for low-cost and high-sensitivity detection of AFB1.
研究领域:
分析化学
·
食品安全
·
电化学传感器
·
纳米材料
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2025
·
IF 10.5
Xu Yang,Fan Wu,Haowei Huang,Guojun Zheng,Hongyu Zhang,Wenrong Cai,Junyao Li,Zheng-Zhi Yin,Yong Kong
Wearable sensors can easily enable real-time and noninvasive glucose (Glu) monitoring, providing vital information for effectively preventing various complications caused by high glucose level. Here, a wearable sensor based on nanozyme-catalyzed cascade reactions is designed for Glu monitoring in sweat. Au nanoparticles (AuNPs) are anchored to the carbonated zeolitic imidazolate framework-8 (ZIF-8-C), endowing the sensor with Glu oxidase (GOx)-like and peroxidase (POD)-like activity. A flexible screen-printed carbon electrode (SPCE) is decorated with the resultant AuNPs@ZIF-8-C, which is further modified with biocompatible and swellable calcium alginate (CA) gels for the preparation of the wearable Glu sensor. The linear range for Glu detection is 10∼300 μM with a limit of detection (LOD) of 4.99 μM, which covers the physiological Glu concentration range in human sweat (10–200 μM). The developed wearable Glu sensor can fit well with the skin tissues due to the flexibility of the SPCE, and thus it can be successfully applied in real-time and noninvasive monitoring of Glu in human sweat. Additionally, the wearable Glu sensor exhibits high antibacterial activity resulted from the generated hydroxyl radicals (·OH), enabling long-term Glu monitoring in sweat.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）