INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yongjiang Shan,Mingliang He,Fei Zhang,Yingdong Yang,Yifei Wang,Tian Gui,Yuqin Li,Zhipeng Wang,Xiangshu Chen
The deployment of green hydrogen energy plays a pivotal role in propelling sustainable development and achieving carbon neutrality. Separating H2 and CH4 is a crucial step in industrial hydrogen purification. Metal–organic framework (MOF) membranes offer vast prospects for applications in gas separation. Breaking the “trade-off” between permeance and selectivity has consistently remained a primary challenge in the realm of separation membranes. In this work, highly permeable H2 separation ZIF-8 membranes were fabricated on a vertical graphene (VG)-modified α-Al2O3 support (VG@α-Al2O3), and the VG layer can afford active sites for synthesizing ZIF-8 membranes and provide more gas transport path to reduce the mass transfer resistance. With the aid of O2 plasma in improving the hydrophilicity of the VG layer, nano-ZIF-8 crystals can be synthesized on the VG to act as seeds (ZIF-8@VG@α-Al2O3) for membrane synthesis, and green synthesis membranes were realized in aqueous solution. At 90 °C for 12 h, about 900 nm-thick membrane layers were synthesized, with a high H2 permeance of 1.8 × 10–6 mol·m–2·s–1·Pa–1 and H2/CH4 separation factor of 9.6. After the synthesis period was increased to 24 h, the denser ZIF-8 membrane resulted in a higher H2/CH4 selectivity (17.2). In contrast to the MOF membranes described in previous studies, satisfactory hydrogen permeance of ZIF-8 membranes can be achieved while maintaining high selectivity.
研究领域:
材料科学
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膜分离技术
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纳米材料
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能源化学
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环境科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Longwei Yin,Wenpeng Li,Shen Lin,Gary Owens,Zuliang Chen
Arsenic contamination is an increasing global environmental problem, especially in mining industry wastewater where both arsenite (As(III)) and arsenate (As(V)) have been routinely detected. In this paper, a novel porous metal-organic framework material (ZIF-8) was composited with iron nanoparticles (FeNPs) to form a functional material (ZIF-8@FeNPs) for the simultaneous removal of As(III)/(V) from wastewater. The material effectively removed both As(III) and As(V) with removal efficiencies of 99.9 and 71.2%, respectively. Advanced characterization techniques including X-ray photoelectron spectroscopy (XPS) and Fourier infrared (FTIR) indicated that removal of As(III) and As(V) involved complex formation. Adsorption kinetics followed a pseudo-second order kinetics indicating adsorption involved chemisorption . After four cycles of reuse the he removal rate of As species was still relatively high at > 60% When ZIF-8@FeNPs were used to remove As from real wastewater from acid mines the removal efficiency was 94.27%. Finally, a As(III) and As(V) removal mechanism was proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Sihan Ai,Yong Xiang,Xue Chen,Yanlin Zhang,Yufei Zhang,Kangning Lv,Xin Chen,Daoyong Yu,Baosheng Ge,Fang Huang
Carbon dioxide capture, utilization and storage (CCUS) technology is considered an effective solution to achieve carbon neutrality. In CCUS, chemical absorption stands out as an efficient CO 2 capture method suitable for environments with low CO 2 partial pressures. This study aims to enhance the CO 2 capture performance of monoethanolamine (MEA) solution by employing zeolitic imidazolate frameworks ZIF-8 and ZIF-67 as catalysts. The impacts of catalyst concentration and experimental temperature on the quantity, rate of absorption, rate of desorption, and reusability of MEA for CO 2 absorption were investigated. Changes in the volume concentration of CO 2 in the mixed gas were monitored to assess these parameters. The results demonstrated that at a catalyst concentration of 150 mg/mL for ZIF-8 and 125 mg/mL for ZIF-67, MEA achieved CO 2 absorption quantity of 22.22 % and 18.89 %, respectively. This corresponded to substantial increases of 63.39 % and 125.9 % in the CO 2 maximum absorption rate of MEA solution. While the maximum desorption rate of MEA was enhanced by 49.71 % and 83.28 %. In conclusion, the introduction of ZIF-8 and ZIF-67 catalysts effectively catalyzed the CO 2 capture process, significantly enhancing the CO 2 capture quantity of MEA and ensuring energy-efficient regeneration of MEA. This study provides a novel approach for improving the performance of MEA in terms of capturing CO 2 .
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 19
·10346
·
IF 4.9
Jiadong Hu,Jiaxin Li,Qunqun Guo,Guicai Du,Changming Li,Ronggui Li,Rong Zhou,Hongwei He
Dopamine (DA) is a widely present, calcium cholinergic neurotransmitter in the body, playing important roles in the central nervous system and cardiovascular system. Developing fast and sensitive DA detection methods is of great significance. Fluorescence-based methods have attracted much attention due to their advantages of easy operation, a fast response speed, and high sensitivity. This study prepared hydrophilic and high-performance CdS/ZnS quantum dots (QDs) for DA detection. The waterborne CdS/ZnS QDs were synthesized in one step using the amphiphilic polymer PEI-g-C14, obtained by grafting tetradecane (C14) to polyethyleneimine (PEI), as a template. The polyacrylonitrile nanofiber membrane (PAN-NFM) was prepared by electrospinning (e-spinning), and a metal organic frame (ZIF-8) was deposited in situ on the surface of the PAN-NFM. The CdS/ZnS QDs were loaded onto this substrate (ZIF-8@PAN-NFM). The results showed that after the deposition of ZIF-8, the water contact angle of the hydrophobic PAN-NFM decreased to within 40°. The nanofiber membrane loaded with QDs also exhibited significant changes in fluorescence in the presence of DA at different concentrations, which could be applied as a fast detection method of DA with high sensitivity. Meanwhile, the fluorescence on this PAN-NFM could be visually observed as it transitioned from a blue-green color to colorless, making it suitable for the real-time detection of DA.
研究领域:
生物化学
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材料科学
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医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Jiang-Bo Huo,Lei Xu,Jia-Cheng E. Yang,Hao-Jie Cui,Baoling Yuan,Ming-Lai Fu
Water stable Fe 3 O 4 @ZIF-8 composites were successfully fabricated by a facile modification. The composites were characterized by powder XRD, SEM, TEM and BET surface areas measurement. The results showed that as-obtained Fe 3 O 4 @ZIF-8 composites possess core-shell structures (Fe 3 O 4 as core and ZIF-8 as shell) with a high surface area (1133 m 2 g −1 ). The composites were also evaluated for adsorption of As(III) from solution. Langmuir model could be suitable to express the adsorption isotherm, indicating that the uptake of As(III) on Fe 3 O 4 @ZIF-8 is monolayer adsorption with maximum capacity being 100 m 2 g −1 . Thermodynamics data revealed that the adsorption followed a spontaneous, endothermic and entropy increase process. Batch adsorption experiments demonstrated that the adsorption kinetics fit pseudo-second-order better with correlation coefficient R 2 of 0.9881. The effects of anions such as chloride, nitrate, carbonate, phosphate and sulfate on the removal of As(III) were also examined. The results indicated that ordinary anions would not hinder adsorption of As(III) except that the carbonate and phosphate anions could compete with As(III) for adsorptive sites on the adsorbent. This research showed Fe 3 O 4 @ZIF-8 is a promising composite in practical application as it can be easily separated by magnetism after used in the water treatment with efficient removal of As(III) from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yuyi Zhang,Yuting Du,Qinghong Yuan,Chao Hang,Xiaolei Zhang,Bingwen Hu,Qingyuan Jin,Mengdi Chen
Enhancing the fluorescence of organic dye by colloidal particles is one of the most promising routes to optimize fluorescence detection. However, in addition to metallic particles, which serve as the most frequently used particles and have been found to employ the plasmonic resonance to provide strong fluorescence enhancement, neither new types of colloidal particles nor new fluorescence mechanisms have been intensively explored in recent years. In this work, strongly enhanced fluorescence was observed when 2-(2-hydroxyphenyl)-1H-benzimidazole (HPBI) molecules were simply mixed with zeolitic imidazolate framework-8 (ZIF-8) colloidal suspensions. Moreover, the enhancement factor ΔI = IHPBI+ZIF-8/IHPBI does not increase accordingly with the increasing amount of HPBI. To find out how the strong fluorescence was triggered and affected by the amount of HPBI, multiple techniques were applied to analyze the adsorption behavior. By combining analytical ultracentrifugation with first-principles calculations, we proposed that HPBI molecules were adsorbed onto the surface of ZIF-8 particles coordinatively and electrostatically, depending on the concentration of HPBI molecules. The coordinative adsorption would result in a new kind of fluorescence emitter. The new fluorescence emitters tend to distribute on the outer surface of ZIF-8 particles periodically. The distance between each fluorescence emitter is fixed and much smaller than the wavelength of the excitation light. Thus, it can be concluded that collective spontaneous emission might be triggered.
研究领域:
化学
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材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
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2023
·
IF 1.5
Meng Jiang,Lin Zhu,Zejun Zhang,Yijing Ai,Lina Zeng,Shuhai He,Lin Li,Wei Sun
In this article the ZIF-8 based metal-organic frameworks-derived porous carbon was mixed with aminated graphene to obtain the nanocomposite, which was used to modify the surface of glassy carbon electrode (GCE). SEM, XRD and FT-IR were used to characterize the nanocomposite, which exhibited the unique morphology with functional groups. The modified electrode was applied to the electrochemical detection of rutin. Compared with that of GCE, the current response of rutin increased obviously on the modified electrode. Square wave voltammetry was further applied to quantitative analysis of rutin with a linear relationship between the concentration and peak current in two sections from 0.25 to 0.7 μmol·L -1 and 0.7 to 1.5 μmol·L -1 with detection limit of 15 nmol∙L -1 . Consequently, the detection of real samples was realized by this method.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Mengqi Liu,Honglin Yu,Daiming Liu,Guodong Zhang,Fei Wang
In order to enhance CH 4 adsorption and absorption performance, ZIF-8@Cu was prepared by precipitation method at room temperature, while a hydrate accelerator of SO 3 − @PSNS was synthesized by the polymerization method, and CH 4 adsorption-absorption synergistic storage in ZIF-8@Cu that pre-adsorbed SO 3 − @PSNS solution was evaluated for the first time. It was found that Cu 2+ can effectively improve the adsorption kinetics of CH 4 , causing ZIF-8@Cu to reach a higher adsorption capacity, and CH 4 adsorption capacity of ZIF-8@Cu /0.14% is 12.45 % higher than that in ZIF-8. Furthermore, Cu 2+ provides additional nucleation sites for CH 4 hydrate, thereby enhancing the overall CH 4 storage density. For the water content of R w = 0.5, the doping of 0.14 % Cu 2+ causes CH 4 storage capacity via adsorption-absorption synergy increases by 33.93 %. It is worth to note that SO 3 − @PSNS significantly reduces hydration pressure while retains CH 4 adsorption ability in ZIF-8@Cu. For R w = 0.5, hydration pressure in SO 3 − @PSNS system reduces by up to 45 % compared with that in water system, while CH 4 storage capacity increases by up to 94 %. This finding makes it possible for CH 4 dense storage under low pressure via adsorption-hydration hybrid approach.
研究领域:
材料科学
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能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Xingxing Yin,Peng Mu,Qingtao Wang,Jian Li
Magnesium (Mg) and its alloys are regarded as the most promising engineering materials because of their unique property. However, the Mg alloys were easily corroded in humid environments, which restricted their wider applications. Herein, the superhydrophobic ZIF-8/PVDF/LDH (SZPL) double-layered coating was fabricated on Mg alloys via electrodeposition and dip-coating methods, which consisted of the underlying layered double hydroxide (LDH) transition structure and top superhydrophobic zeolitic imidazolate framework-8 (ZIF-8) layer. Besides, the LDH transition structure not only worked as a protection shield but also strengthened the binding force between the substrate and the top superhydrophobic ZIF-8 layer. The top superhydrophobic ZIF-8 layer could serve as an armor on the LDH layer to further prevent the corrosive ions from infiltrating the microporous defects. In addition, the as-prepared SZPL double-layered coating showed robust superhydrophobic and self-cleaning properties, which could block the electrolyte invasion. Furthermore, the electrochemical tests demonstrated that the SZPL coating highly enhanced the corrosion protection ability of Mg alloys. Moreover, the superhydrophobic ZIF-8-based coating could still retain excellent anticorrosion property after immersion in 3.5 wt % NaCl solution for 7 days. The enhanced anticorrosion ability was ascribed to the fact that a synergistic effect of the underlying LDH transition layer hindered the transmission of aggressive ions and the top superhydrophobic ZIF-8-based coating decreased the contact area of the substrate with corrosive solution. Therefore, such coatings offer a new strategy for fabricating excellent anticorrosive coatings with robust superhydrophobicity and self-cleaning performance on metal substrates.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2015
·Vol. 62
·期 5
·1728-1739
·
IF 2.748
Hao Zhang,Yan Wang
Ethanediamine-modified zeolitic imidazolate framework (ZIF)-8 particles (ZIF-8-NH 2 ) is synthesized and incorporated in the poly(vinyl alcohol) (PVA) matrix to fabricate novel PVA/ZIF-8-NH 2 mixed matrix membranes (MMMs) for pervaporation dehydration of ethanol. The PVA/ZIF-8-NH 2 MMMs exhibit enhanced membrane homogeneity and separation performance because of the higher hydrophilicity and restricted agglomeration of the particles, as compared to corresponding MMMs loaded with unmodified particles. The effect of ZIF-8-NH 2 loading in the MMMs is studied and the MMM with a 7.5 wt % ZIF-8-NH 2 loading shows the best pervaporation performance for ethanol dehydration at 40°C. Various characterization techniques (Fourier transform infrared, scanning electron microscope, contact angle, sorption test, etc.) are used to investigate the MMMs loaded with ZIF-8 and ZIF-8-NH 2 particles. The impact of operation conditions on pervaporation performance is also performed. The performance benchmarking shows that the MMMs have superior separation factors and comparable flux to most other PVA hybrid membranes. © 2016 American Institute of Chemical Engineers AIChE J , 62: 1728–1739, 2016
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 THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·H952
·
IF 3.259
Ming Nie,Shun Lu,Dan Lei,Chi Yang,Zuzhen Zhao
Zeolitic imidazolate framework-8 is obtained rapidly within 30 min via ultrasonic-assisted solvothermal method. The structure, elemental composition and morphology are investigated by X-ray diffraction, energy-dispersive X-ray detector, scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller. The results show that Zeolitic imidazolate framework-8 nanocrystals possess cubic sodalite-related structure and provide more active sites for adsorption. Furthermore, the prepared Zeolitic imidazolate framework-8 nanocrystals have been examined for the electrochemical sensor of dopamine using cyclic voltammetry and differential pulse voltammetry techniques. The electrochemical studies demonstrate that the modified electrode displayed enhanced catalytic activity in the process of oxidation of dopamine when the working potential is −100 mV. Additionally, we use the sensor to detect dopamine linearly over a concentration range from 5.0 × 10−8 to 2.0 × 10−5 M with a lower detection limit of 1.95 × 10−7 M (S/N = 3). Importantly, Zeolitic imidazolate framework-8 nanocrystals modified electrode showes favorable anti-interference ability and long-term stability.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2025
·
IF 4.9
Liu Li,Lai Dengwang,Cao Wuyan,Bao Zanjuan,Zhao Tian,Wang Chunhua,Liu Yuejun,Yang Jun
This study synthesized zeolitic imidazolate framework (ZIF-8) using a solvothermal method and employed mechanical stirring to coat basic magnesium hypochlorite (BMH) onto the surface of ZIF-8, thus preparing antibacterial microspheres of BMH/ZIF-8. Escherichia coli ( E. coli ) was used as the model bacterium, the effect of BMH concentration on the antibacterial effect of BMH/ZIF-8 was explored, and the optimal BMH concentration was determined to be 100 µg/mL. The antibacterial rate was 73% for BMH, 20% for ZIF-8, and 100% for BMH/ZIF-8, as determined by the plate counting method. In addition, the synergistic effect factor (SEF) determination method calculated SEF > 0. This shows that BMH and ZIF-8 had a synergistic antibacterial effect. Important techniques such as Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), and X-ray Diffraction (XRD) analysis were employed to investigate the synergistic antibacterial mechanism of BMH and ZIF-8. The mechanism is that porous ZIF-8 with ultra-large specific surface area cooperates with BMH to antibacterial. This synergistic effect allows BMH sheets to be adsorbed on the surface of ZIF-8, greatly increasing the contact area between the antibacterial agent BMH and bacteria. Additionally, BMH adsorbed on the surface of ZIF-8 can also serve as surface protection, thus delaying the breakage of Zn-N coordination bonds within ZIF-8. Consequently, as BMH on the surface of ZIF-8 is gradually consumed, the Zn-N coordination bonds undergo breakage, leading to slow release of internal Zn 2+ and 2-methylimidazole organic ligands. Zn 2+ possesses oxidizing properties, enabling it to bind with bacteria and disrupt their protein structures. Meanwhile, 2-Methylimidazole can undergo degradation, resulting in the generation of reactive oxygen species (ROS). The hydrophobic methyl group of 2-Methylimidazole is also able to compromise the integrity of bacterial membranes and impede the activity of key enzymes by means of chelating metal ions. Collectively, these mechanisms, in conjunction with ROS, establish a multifaceted antimicrobial network, thereby engendering a favorable antimicrobial effect.
研究领域:
材料科学
·
微生物学
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医学
✓ 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）