NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 8
·4068-4073
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IF 3.925
Lin Li,Sijia Zhang,Yingying Li,Ting Wang,Xiaohong Hou
In this study, zeolitic imidazole framework-8/cellulose membrane (ZIF-8/CM) was fabricated through an in situ synthesis method. The composite was installed in a dismountable filter and used as a sorbent for lab-made microextraction in packed syringe (MEPS). The entire MEPS procedure can be performed through simple operation of filtration, since the macroporous cellulose membrane was introduced as the substrate for ZIF-8 powder. Coupled to a high performance liquid chromatography tandem ultraviolet detector (HPLC-UV), the proposed method was applied for the analysis of tetracyclines in water samples. The extraction parameters, including the adsorbent type, sample solution pH, sample volume, type and volume of the elution solvent, were systematically studied. Under optimized conditions, desirable linearity (r > 0.99 for three analytes), high sensitivity (limit of detection: 0.1373–0.8917 μg L−1), good precision (RSD < 6.3%) and ideal recovery (72.9–97.6%) were obtained. The proposed method was demonstrated to be efficient, easily operative and environmentally friendly.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ziheng Li,Wenji Zheng,Xuehua Ruan,Yan Dai,Xiangcun Li,Miao Yu,Xiaobin Jiang,Xuemei Wu,Gaohong He
Highly-loaded metal–organic frameworks (MOFs) based mixed matrix membranes (MMMs) are essential for high-efficiency gas separation. However, the continuous distribution of MOFs across the membrane with intensified interface remains challenging. Herein, a flexible and defects-free MMM with a bi-continuous MOFs pathway is constructed by dopamine (DA)-assisted MOFs growth along nanofibers. Nanofibers are used to upload and distribute ZIF-8, which continues to grow via an epitaxial growth strategy to obtain ZIF-8 fibers, achieving ZIF-8 continuous both in long and short range. DA promotes heterogeneous nucleation and growth of ZIF-8 on fiber surface by chelating with Zn 2+ through –OH and –NH 2 groups. DA also ensures excellent interfacial compatibility by hydrogen bonding interaction between amino groups of DA and ether-oxygen groups of PEO. Finally, the highly-loaded MMM is constructed by in-situ photopolymerization of Poly (ethylene glycol) diacrylate) to embrace ZIF-8 fibers tightly. The resultant MMM presents ZIF-8 loading as high as 72.41 vol% with Young’s modulus of 33.42 MPa, and unchanged morphology and separation performances after bending for 180° over 50 times, revealing outstanding mechanical properties. The CO 2 permeability and CO 2 /N 2 selectivity are 280.3 % and 73.0 % higher than the PEO membrane, surpassing the 2019 McKeown upper bound.
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
·
2022
·
IF 9.136
Yanan Li,Tingting Fan,Wenying Cui,Xia Wang,Seeram Ramakrishna,YunZe Long
Efficient treatment organic pollutants and oily wastewater with high toxicity under harsh environment is eagerly desired, while conventional membranes cannot meet the demand due to its poor chemical resistance which still remains a great challenge. Herein, biomimic polytetrafluoroethylene (PTFE) @ zeolite imidazole framework (ZIF-8) fibrous membrane for efficient photocatalytic organic pollutants degradation and oil-water separation under harsh environments was successfully developed, via electrospun PTFE nanofibrous membrane with numerous micro-nano rough papillae followed by in situ growth highly porous ZIF-8. The high surface area PTFE@ZIF-8 membrane with lotus-leaf-like structure exhibits excellent photocatalytic degradation performance to organic pollutants such as dyes (methylene blue and rhodamine B) and antibiotics (tetracycline) in harsh environments (strong acids/bases) with a remarkable high removal efficiency (99.99%). Meanwhile, the fluorinated PTFE@ZIF-8 membranes with super-hydrophobicity and super-lipophilicity property also exhibit outstanding oil/water separation performance (chloroform, kerosene, dichloromethane, toluene and n-hexane), with an extremely high flux of 2157 L m −2 h −1 (dichloromethane/water) and separation efficiency of 99.99% (kerosene/water). Furthermore, the membrane also able to separate water-in-oil emulsions effectively with an efficiency of as high as 99.99%. Most importantly, the robust PTFE@ZIF-8 membrane possesses excellent corrosion resistance, self-cleaning and recycling properties, which could still maintain such high separation efficiency and flux even after more than 10 cyclic oil-water separation tests under harsh environments. The multifunctional membrane with excellent harsh environment-tolerance offers an inspired strategy for efficient wastewater treatment under complex conditions and shows great potential for practical applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Lin Li,Hongyu Zhang,Qian Zhang,Ting Wang,Xiaohong Hou
In this study, Zeolitic Imidazole Framework-8/cellulose aerogel (ZIF-8/CA) hybrid was successfully fabricated through a simple doping method and ZIF-8 acted as the major component for adsorption. In order to elucidate the adsorption mechanism deeply, molecular simulation was adopted to the expound the interaction modes between ZIF-8 and the fluoroquinolones (FQs). ZIF-8/CA was used as the adsorbent for semi-automated pipette tip solid phase extraction (PT-SPE). In combination with high performance liquid chromatography tandem fluorescence detector (HPLC-FLD), the established method was successfully employed to determine trace amount of FQs in water samples. Extraction parameters such as the content of ZIF-8, pH of sample solution, volume of sample, flow rate of sampling, type and volume of elution solvent were investigated. Under the optimized conditions, satisfactory linearity was achieved with the correlation coefficient (R 2 ) ranging from 0.9954 to 0.9992. The limits of detection were in the range of 0.337–1.707 ng L −1 . And the recoveries varied from 75.9% to 96.8% with RSD less than 8.0%. The established method was demonstrated to be sensitive, efficient and convenient.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Jijie Kong,Fengxi Zhu,Wen Huang,Huan He,Jiapeng Hu,Cheng Sun,Qiming Xian,Shaogui Yang
In this study, three kinds of Zeolite imidazolate framework-8 (ZIF-8), synthesized by solvothermal, stirring and ball-milling method, were fabricated on the stainless steel wire via sol-gel technique. These fibers were used as solid phase microextraction (SPME) coating materials and applied for analyzing 16 polycyclic aromatic hydrocarbons (PAHs) and 11 nitro polycyclic aromatic hydrocarbons (NPAHs) in environmental water samples by gas chromatography-tandem mass spectrometry (GC–MS). The optimal pH, ionic strength, extraction time, extraction temperature, desorption temperature and desorption time were 6.0, without salt addition, 45 min, 35 °C, 260 °C and 5 min, respectively. The extraction mechanism of the ZIF-8 fiber might be the hydrophobicity , molecular penetration and π-π stacking interactions. Under the optimized conditions, the as-proposed fiber provides a wide linearity range from 10 to 20,000 ng L −1 and a low detection limit of 0.3–27.0 ng L −1 for PAHs and NPAHs analysis. The single fiber and fiber to fiber relative standard deviations were observed in the range of 3.0%–13.9% and 3.5%–12.3%, respectively. The method shows great potential in environmental analysis field.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Shu,Longfei Qiao,Jialong Geng,Cong Li,Bang Chen,Qidong Wang,Hiroshi Uyama,Yehua Shen
In this work, hierarchically ZIF-8@Cellulose acetate composite monolithic carbon (ZCMC) was fabricated for the first time by combining a template-free thermally induced phase separation (TIPS) method with in-situ ZIF-8 crystals doping followed by KOH activation. By altering ZIF-8 content and activation temperature, a series of ZCMC samples were prepared in order to analyze the effect of pore structure and surface chemical characteristics on CO 2 adsorption. The optimal sample of 20-ZCMC-800 exhibited the largest CO 2 uptake of 7.30 (0 °C) and 4.26 mmol/g (25 °C) at 1 bar, which was competitive with the majority of the reported porous carbons. Additionally, the CO 2 adsorption capacity after 10 cycles still remained at 96 % of its initial value and the ideal adsorption solution theory (IAST) CO 2 /N 2 selectivity was 21.31 at 25 °C, indicating excellent recyclability and good selectivity. Furthermore, it was found that the CO 2 adsorption capacity was considered to be linear relationship with micropore but independent on BET specific surface area. The contributions of N-containing functional groups and ZnO crystals created from ZIF-8 pyrolysis at high temperature for CO 2 adsorption were thoroughly discussed under density functional theory (DFT) and grand canonical Monte Carlo (GCMC). The results showed that pyrrole-N group contributed significantly to CO 2 adsorption by hydrogen bonding and Lewis acid-base interactions, while the ZnO crystals displayed the strong interaction with CO 2 by the chemisorption process. The CO 2 adsorption performance of ZCMC was mostly determined by the joint effect of micropore structure and surface chemical compositions. The thermodynamic parameters of Q st ranged from 23.03 to 33.23 kJ/mol, revealing the CO 2 adsorption still belonged to the scope of physisorption process. More importantly, the novel and feasible strategy presented herein is expected to provide an innovative approach for the design and discovery of ZIFs-based composite carbon materials for efficiently CO 2 adsorption.
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
CELLULOSE
·
2019
·Vol. 27
·期 4
·2237-2251
·
IF 3.917
Nabipour Hafezeh,Nie Shibin,Wang Xin,Song Lei,Hu Yuan
In the current study, Zeolitic Imidazole Framework-8 (ZIF-8) was in situ grown on the surface of cellulose fibers and the ZIF-8@cellulose composite aerogels were fabricated by a freeze-drying method. The flame-retardant, thermal and mechanical characteristics of the cellulose-based aerogels were investigated. SEM images indicated that ZIF-8 was evenly deposited on the surface of the cellulose fibers in the aerogel owing to formation of hydrogen bonding with cellulose molecules. The addition of ZIF-8 enhanced thermal stability and flame retardancy of the host cellulose aerogel. The peak of heat release rate of the ZIF-8@cellulose-3 composite aerogel exhibited a drastic decline from 128 W g −1 to 63 W g −1 and the total heat release from 25.9 kJ g −1 to 14.8 kJ g −1 . In the UL-94 vertical burning test, the samples showed self-extinguishing behavior. Additionally, ZIF-8 induced a dramatic enhancement in the mechanical properties of the host cellulose. Specifically, the compressive stress of the ZIF-8@cellulose composite aerogel showed a significant increase from 0.45 to 34.80 MPa. Moreover, the ZIF-8@cellulose composite aerogel can selectively remove the organic pollutants from water and adsorb a wide range of liquid oils with considerable capacities. The current study presented a feasible approach to synthesis of strong and flame-retardant cellulose-based aerogels for waste water purification.
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
危险品化学品经营许可证（带存储）