Analytical Methods
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2020
·Vol. 12
·期 32
·4058-4063
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IF 2.596
Hao Guo,Xiaoqiong Wang,Ning Wu,Mengni Xu,Mingyue Wang,Longwen Zhang,Wu Yang
A novel composite (CDs@ZIF-8) based on carbon dots (CDs) and zeolitic imidazolate framework (ZIF-8) was successfully synthesized by encapsulating CDs into the pores of ZIF-8 through a simple one-pot solvothermal method. The as-synthesized CDs@ZIF-8 inherited simultaneously the strong adsorption capacity of ZIF-8 and the excellent optical properties of CDs. The composite exhibited excellent dispersibility and high structural and fluorescence stability in aqueous solution, which could be employed as an excellent turn-off mode fluorescent probe to detect Cu2+. The large specific surface area and strong adsorption properties of ZIF-8 enabled the resultant composite to effectively enrich Cu2+ for further improving the analytical sensitivity. The possible fluorescence quenching mechanism has also been discussed in detail and it was found that the effective fluorescence quenching of Cu2+ to CDs@ZIF-8 could be attributed to the strong ability of Cu2+ to combine with the carboxyl group or amino group on the CD surface and the strong adsorption capacity of ZIF-8; their synergistic effect resulted in effective fluorescence quenching.
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MATERIALS LETTERS
·
2020
·
IF 3.204
Feihong Wang,Tong Zheng,Panpan Wang,Jun Ma
In this study, we investigated the influences of zeolitic imidazolate framework-8 derived porous carbon (CZIF-8) on the permeation and antifouling property of thin-film nanocomposite membranes (TFN). The incorporation of CZIF-8 into polyamide layer enhanced the water flux from 11.64 to 18.23 L/m 2 ∙h without decreasing NaCl rejection. Dynamic fouling tests with bovine serum albumin illustrated that the TFN membrane possessed an enhanced antifouling property after three cycles. The higher water flux recovery ratio and the lower fouling ratio of TFN membranes are attributed to the changes in physiochemical property of membrane.
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CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Wei Zhu,Wenquan Huang,Liping Ye,Yuehua Deng,Qiuling Xie,Yanbin Jiang
Zein nanoparticles have good prospects as a pharmaceutical carrier but limited in further application by its poor stability and re-dispersibility. To obtain high stability and pH-responsive drug delivery, succinylated-zein (Suc-zein) was synthesized by nucleophilic substitution reaction, the material obtained was used to prepare Suc-zein nanoparticles (SZs). The SZs prepared not only had good dispersibility but showed better stability than zein particles on pH, storage and salinity. After loading indomethacin (Indo) into zeolitic imidazolate framework-8 (ZIF-8), the core-shelled Indo-Suc-zein-ZIF-8 (Indo-SZZs) were fabricated by coating Suc-zein onto the surface of ZIF-8 with better stability and high drug loading. Indo-SZZs were pH-responsive and sustained a drug release profile in a simulated environment. Also SZZs presented as being non-toxic, having good biocompatibility and good cellular up-take performance, and the cytotoxicity of Indo-SZZs was significantly higher than that of Indo. This provides a new insight into the preparation of a zein-based oral drug delivery system.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yangmei Qin,Shizhao Jian,Ke Bai,Yuyang Wang,Zenghui Mai,Senqing Fan,Boya Qiu,Yu Chen,Yinan Wang,Zeyi Xiao
With the PTFE membrane as the substrate, a novel Ag-based catalytic membrane reactor (CMR) was fabricated by deep-permeation synthesis fabrication (DPSF). In DPSF, ZIF-8 was first assembled inside the membrane pores by permeation flow and the depositing reaction of Zn2+, and 2-methylimidazole solutions flow through the membrane synergistically. Then, Ag was reduced inside the pores impregnating ZIF-8 nanoclusters by Ag+ and reductant solutions flowing through the membrane similarly. The TEM images of the cross-sectional membrane exhibited the composite nanoparticles of Ag+ZIF-8 with good dispersion and size distribution (10–50 nm). The as-synthesized (Ag+ZIF-8)@PTFE was applied to the catalytic reduction of p-nitroaniline to p-phenylenediamine in a continuous flow-through reactor and presented remarkable catalyzing performance. The maximal apparent reaction rate constant is 3–4 orders of magnitude higher than that reported with good stability.
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Polymers
·
2019
·Vol. 11
·期 12
·1986
·
IF 3.164
Shaoxiang Lee,Yunna Lei,Dong Wang,Chunxu Li,Jiaji Cheng,Jiaping Wang,Wenqiao Meng,Meng Liu
ZIF-8 nanoparticle-doped polyvinyl alcohol (PVA)-S-MC films were prepared via casting method. The effect of different concentrations of ZIF-8 on the physical properties and structural characterization of the films were investigated. The results indicated that ZIF-8 could increase the water resistance and mechanical property of the membrane. Through FTIR, scanning electron microscope (SEM), atomic force microscope (AFM), and TGA analysis, it was found that ZIF-8 changed the phenomenon of macromolecule agglomeration and improved the thermal stability of the membrane. The breathable behavior of the film was also studied through oxygen permeability and water vapor permeability analysis. The result illustrated that the breathability of the film improved significantly by adding ZIF-8. The maximum reached when the weight ratio of ZIF-8 was 0.01 wt %. The property expands the application of PVA/starch blend film in the postharvest technology of fruits and vegetables.Keywords:PVA/starch;composite membrane;metal-organic frameworks
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Runjiang Guo,Hongdong Wang,Ran Tian,Dongliang Shi,Hua Li,Yao Li,Hezhou Liu
In this report, a novel hollow boxes shape ZnSnO 3 is synthesized via a one-pot surfactant-free method. We synthesize CNT@ZnSnO 3 hollow boxes via hydrothermal reaction by using the Zn-MOF(ZIF-8) as the Zn source at the first time. Several characterization techniques are used to investigate the structure, morphology, composition and specific surface area of CNT@ZnSnO 3 . CNT@ZnSnO 3 hollow boxes demonstrated large specific surface area (up to 45.73 m 2 /g), which is favorable for the strong gas sensor response. The ethanol sensor based on CNT@ZnSnO 3 hollow boxes exhibited high response of ethanol up to 166 at 240 °C at the concentration of 100 ppm, which is about 8 times higher than the sensing response of ZnSnO 3 nanocubes. Moreover, CNT@ZnSnO 3 hollow boxes based ethanol sensor also shows the excellent selectivity and stability. As a novel green gas sensor, CNT@ZnSnO 3 hollow boxes show the great potential in the gas sensing field.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Mingmin Jia,Xiong-Fei Zhang,Yi Feng,Yichen Zhou,Jianfeng Yao
ZIF-8@cellulose nanofiber (ZIF-8@CNF) composite membranes were prepared via in-situ growing ZIF-8 crystals on cellulose nanofibers (CNFs) and vacuum filtration. Owning to the electrostatic forces between –COO - of CNFs and Zn 2+ of ZIF-8, ZIF-8 crystals were anchored homogenously on CNFs. With ZIF-8 loading increased to sufficiently high, the intrinsic selectivity of ZIF-8 played an important role for gas separation. As a result, the optimum separation performance is achieved over ZIF-8@CNF-70 composite membrane with CO 2 permeability of 550 Barrer and CO 2 /N 2 and CO 2 /CH 4 ideal selectivity of 45.5 and 36.2, respectively.
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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.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yonghong Wang,Lecheng Sheng,Xinru Zhang,Jinping Li,Rong Wang
Carbon molecular sieve (CMS) membranes have great promise in CO 2 capture. However, tortuous transport passageways restrict the enhancement in the permeability due to the presence of disordered porous structure and dead-end pore. Herein, the growth of ZIF-8 layer on the surface of Fe 3 O 4 formed magnetic core-shell Fe 3 O 4 @ZIF-8 particles, which were fixed into 6FDA/ODA:DABA polyimides under magnetic field-induction to fabricate a precursor membrane with vertically oriented chain-like particles. It was then pyrolyzed to form hybrid carbon molecular sieve (HCMS) membranes with ordered microporous structure under high temperature conditions. The cross-section scanning electron microscopy images and N 2 adsorption for resultant HCMS membranes indicate that Fe 3 O 4 @ZIF-8-derived carbons frameworks were vertically oriented to form the ordered microporous structure, which also had good compatibility with carbon matrix stemmed from 6FDA/ODA:DABA polyimides. The as-prepared HCMS membranes embedded with 5 wt% Fe 3 O 4 @ZIF-8 manifested a highest gas separation performance (permeability of 5130 Barrer; CO 2 /N 2 selectivity of 29; CO 2 /CH 4 selectivity of 48), outperforming the pristine CMS membranes, which were near and beyond 2019 CO 2 /N 2 and CO 2 /CH 4 upper bounds, separately. These good separation performances resulted from vertical chain-like microporous particles, which provided fast transport channels to accelerate CO 2 diffusion rate. In addition, we supposed that Fe 3 O 4 prevent ZIF-8 frameworks from destruction during the pyrolysis and promote the size screening capability. More importantly, this membrane exhibited excellent aging resistance over 30 days aging testing compared to pristine CMS membranes. Therefore, it affords a feasible way for carbon capture from flue gas and natural gas.
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AICHE JOURNAL
·
2022
·Vol. 69
·期 4
·e17934
·
IF 4.167
Yali Zhao,Xiayi Yang,Jiayu Luo,Yanying Wei,Haihui Wang
MOF membranes are very promising in molecular separation, but it is still a challenge for industrial applications due to the complex and time-consuming synthesis. We use the fast current-driven synthesis (FCDS) method to achieve controlled growth of ZIF-8 membranes on porous graphite-coated ceramic tubes by controlling the growth time and current density. Grown for 30 min at a current density of 0.74 mA/cm 2 , the ZIF-8 membrane exhibits selectivity for C 3 H 6 /C 3 H 8 up to 63 with C 3 H 6 permeance of 6 × 10 −9 mol/(m 2 s Pa). Furthermore, the ZIF-8 membrane exhibits a pressure resistance of up to 3 bar and good stability of ~96 h. This work realizes the breakthrough of the MOF membrane synthesis via FCDS method from the frequently-used expensive and fragile anodic aluminum oxide (AAO) disc substrate to the tough ceramic tubular substrate, which broadens the road for the industrialization of MOF membranes in gas separation fields.
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Journal of Environmental Chemical Engineering
·
2026
·
IF 7.5
Ying Xue,Xiaonan Hao,Yue Wu,Yang Xu,Jundi Long,Jian Dong,Yuanrui Wang,Shulin Sun
Combined NVP grafting and MMT@ZIF-8@TA modification raised pure water flux to 836.84 L·m⁻²·h⁻¹, ~6.8× of pristine PLA membrane. • The membrane retained over 95% rejection for four cationic/anionic dyes, realizing charge-selective adsorption (98% MeB removal, 99% AO removal). • PZ4 membrane removed 78.59% methylene blue under UV in 150 min; its rate constant (0.00995 min⁻¹) was ~110 times the blank group. • Superoxide (•O₂⁻) and hydroxyl (•OH) radicals were verified as the main active species during photocatalytic degradation. Rapid industrialization and urbanization have exacerbated water scarcity and pollution. Traditional polymer membranes are non‑renewable and non‑biodegradable. Polylactic acid (PLA) is a biodegradable and renewable alternative, but its hydrophobicity and lack of functional groups restrict its direct application in water purification. To address these limitations, we grafted N‑vinylpyrrolidone (NVP) onto PLA chains via free‑radical polymerization to obtain PLA‑g‑PVP with enhanced hydrophilicity. Zeolitic imidazolate framework‑8 (ZIF‑8) was grown in situ on montmorillonite (MMT) and coated with tannic acid (TA) to obtain MMT@ZIF‑8@TA nanoparticles, which synergistically improve membrane porosity, adsorption capacity, and photocatalytic activity. A series of PLA‑g‑PVP/MMT@ZIF‑8@TA (PZ) membranes were fabricated by non‑solvent induced phase separation. The PZ4 membrane exhibited a pure water flux of 836.84 L·m⁻²·h⁻¹ , approximately 6.8 times that of pristine PLA, and achieved over 95% rejection for four representative dyes, including both cationic (auramine O, methylene blue) and anionic (congo red, methyl blue) dyes. After five cycles, the flux recovery rate remained 81.03% with dye rejection > 90%, showing excellent reusability. The PZ membranes also demonstrated adsorption and photocatalytic activity. The PZ4 membrane degraded 78.59% of methylene blue within 150 min under UV irradiation, attributed to efficient separation of photogenerated electron‑hole pairs and synergistic oxidation by hydroxyl (·OH) and superoxide (·O 2 ⁻) radicals, leading to dye mineralization. This eco‑friendly membrane integrates high separation efficiency, which shows great potential for the purification of dye-containing wastewater, and sheds light on the design of multifunctional composite filtration membranes. Download: Download high-res image (266KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Qun Zhang,Haibin Hu,Pengwei Fang,Yuxuan Song,Sicai Wang,Zijin Zhang,Hongchao Ma,Meiwen Cao
Carbonic anhydrase mimics have recently emerged as promising alternative catalysts for industrial CO 2 capture and utilization. Up to now, many strategies have been developed to design and prepare nanostructures with excellent carbonic anhydrase-like catalytic activity. Herein, two kinds of polyphenol molecules (tannic acid (TA) and gallic acid (GA)) were used to etch amino acid (valine (Val) and leucine (Leu)) modified ZIF-8 (AA-ZIF-8) for fabricating carbonic anhydrase mimics. The TA-treated AA-ZIF-8 (Val-ZIF-8/TA and Leu-ZIF-8/TA) possess hollow nanostructure while the GA-treated AA-ZIF-8 (Val-ZIF-8/GA and Leu-ZIF-8/GA) are decomposed into smaller nanoparticles . Zn-polyphenol coordination interaction and protons released by polyphenols are considered to be the driving force for the etching of AA-ZIF-8. Using hydrolysis of p-nitrophenyl acetate (p-NPA) as the model reaction, the carbonic anhydrase-like activity of AA-ZIF-8/polyphenol nanoparticles were evaluated and the results indicated their excellent catalytic activity. Moreover, after using AA-ZIF-8/polyphenol as catalysts, the CO 2 hydration efficiency could also be enhanced. This work provides a new approach for developing carbonic anhydrase mimics, which could help for designing of materials for industrial CO 2 capture.
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