ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Min Jiang,Xueping Cao,Dandan Zhu,Yongxin Duan,Jianming Zhang
A core-shell structure composite, zeolitic imidazolate framework @ cetyltrimethylammonium bromide (ZIF-8@CTAB) was synthesized by CTAB micelle controlling the growth of ZIF-8 in aqueous systems. Direct carbonization of ZIF-8@CTAB at a high temperature produced the nitrogen-doped hierarchically porous carbon (named as PC1000@C). In comparison with the carbonization product of pure ZIF-8 (named as PC1000), PC1000@C possesses the higher specific surface area and two-times larger total pore volume. The results from elemental analysis shows the higher N content in PC1000 sample, while X-ray photoelectron spectroscopy curve-fitting shows the higher quaternary-N content in PC1000@C sample. The hierarchical microporous/mesoporous structure, high surface area and favorable N species in PC1000@C play an active role in catalyzing oxygen reduction reaction (ORR). The specific capacitance of porous carbon was calculated from the galvanostatic-discharge curve. PC1000@C exhibits a large specific capacitance of 225 F g −1 at a current density of 0.5 A g −1 and still retains 92% of initial capacitance after 1000 galvanostatic charge-discharge cycles.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 5
·1166-1174
·
IF 3.4
Min Yuan,Zhiqing Liu,Tiantian Lv,Jinxiang Dong,Qi Shi
BACKGROUND The separation of furfural from a low-concentration multicomponent and acid-containing aqueous solution is a highly demanding process; traditional distillation requires an excessive amount of energy. Herein, we demonstrated ZIF-8-derived microporous carbon (C) as a promising adsorbent for the separation of furfural using adsorption isotherms, dynamic column adsorption, adsorption kinetics and desorption studies. RESULTS In the competitive adsorption kinetics experiments with a furfural/acetic acid concentration of 50/20 g L −1 , the acetic acid adsorbed in the micropores of NC ZIF-8 1000C-800A gradually was replaced by furfural, whereas the amount of acetic acid in the mesopores of NC ZIF-8 800C-800A slowly increased. In addition, the micropores of NC ZIF-8 1000C-800A exhibited highly efficient and fast adsorption characteristics toward furfural over a wide furfural/acetic acid concentration range (0–50/0–20 g L −1 ) with the furfural adsorption capacity reaching an adsorption equilibrium within 10 min. The results show that the high Brunauer–Emmett–Teller surface area of NC ZIF-8 1000C-800A is responsible for the high furfural adsorption capacity (1205.3 mg g −1 ) and the confined microporous structure can strengthen the π–π interactions between porous C and furfural, thereby enhancing the selectivity of furfural/acetic acid (61.4) in the furfural/acetic acid (50/20 g L −1 ) dynamic column adsorption system. Meanwhile, the desorption ratio of furfural in the dynamic desorption system reached as high as 98.6%. CONCLUSION The unique micropore-confinement effect and excellent adsorption behavior make NC ZIF-8 1000C-800A an efficient adsorbent for furfural in the furfural–acetic acid system. © 2023 Society of Chemical Industry (SCI).
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Pei-Hui Shan,Ding-Wu Pan,Li-Xia Chen,Timothy J. Prior,Carl Redshaw,Zhu Tao,Xin Xiao
Herein, we report a simple fluorescence-enhanced system for the selective recognition and determination of the insecticide pymetrozine. 1 H NMR spectroscopic data indicate that 1,2-bis(4-pyridyl)ethylene (BPE) is partially encapsulated in the cavity of the cucurbit[8]uril (Q[8]) in aqueous solution, forming a stable 1:2 host-guest inclusion complex. Good evidence is also provided by other characterization techniques including single crystal X-ray diffraction, UV–Vis and fluorescence spectroscopies. This host-guest inclusion complex shows weak fluorescence in aqueous solution. Interestingly, the addition of pymetrozine greatly enhanced the fluorescence of the host-guest inclusion complex. In contrast, no significant fluorescence enhancement was observed on addition of 10 other pesticides. The concentration of pymetrozine in aqueous solution was easily detected based on the linear relationship between fluorescence intensity and pymetrozine concentration. Therefore, this paper reports a new method to identify and determine pymetrozine by fluorescence enhancement.
研究领域:
分析化学
·
农药科学
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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
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微生物学
·
医学
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产品关联
DOI
高影响因子
Biomaterials Science
·
2025
·
IF 5.7
Min Sun,Jinke Cao,Yang Zou,Haiyan Ju,Yonggang Lv
During tendon injury repair, deficiency of basic fibroblast growth factor (bFGF) is a critical factor leading to unsatisfactory repair results. This study aims to prepare bFGF-loaded zeolite imidazole framework-8 (ZIF-8) nanocrystals using one-pot synthesis method. Subsequently, a bilayer nanofibrous membrane incorporating these drug-loaded nanocrystals was fabricated through electrospinning technology. The potential of this composite nanofibrous membrane to facilitate the continuous release of bFGF at the site of tendon injury was evaluated, with the aim of enhancing the quality of tendon repair. The efficacy of the nanofibrous membrane in promoting tendon differentiation, preventing tendon adhesion, and facilitating tendon repair was assessed through both in vitro and in vivo experiments. At the site of tendon injury, the degradation of ZIF-8 in an acidic microenvironment resulted in the release of bFGF and Zn2+, which contribute to the enhancement of tendon repair. ZIF-8 nanocrystals, achieving an encapsulation efficiency of 50.13% ± 1.42%. Following a continuous release period exceeding 40 days, the cumulative in vitro release rate was determined to be 35.02% ± 4.27%. The incorporation of ZIF-8 nanocrystals into a nanofibrous membrane demonstrated the ability to effectively preserve the bioactivity of bFGF while enabling sustained sustained release at the site of tendon injury, thereby facilitating tendon repair. The findings offer novel insights into the treatment of tendon injuries and provide significant theoretical guidance for the tendon repair process.
研究领域:
生物医学工程
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组织工程
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Xiaolong Han,Tingting Hu,Ye Wang,Huiyong Chen,Yuqi Wang,Ruiqing Yao,Xiaoxun Ma,Jiding Li,Xifei Li
In this article, ZIF-8 nanoparticles were synthesized in water and directly added to a polyethyleneglycol (PEG) aqueous solution (water-based mixing process) to prepare ZIF-8/PEG mixed matrix membranes (MMMs) for pervaporation desulfurization. The structure and properties of ZIF-8 particles were characterized by Fourier Transform-Infrared Spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and BET analysis. The surface composition and structural morphology of all ZIF-8/PEG MMMs were systematically investigated by FT-IR and SEM. The effect of ZIF-8 content on the pervaporation performance of ZIF-8/PEG membranes was investigated. Versus pure PEG membranes, both the total flux and the sulfur enrichment factor of the ZIF-8/PEG MMMs were remarkably increased. This phenomenon is attributed to the good compatibility between PEG and ZIF-8 particles and the high thiophene selective sorption of ZIF-8 particles (confirmed by molecular simulation). Optimal pervaporation performance was achieved at a 4 wt% loading of ZIF-8 particles with the flux of 1.96 kg/(m 2 h) and the sulfur enrichment factor of 8.93. These increased by 397.46% and 18.75% versus pristine PEG membrane, respectively. In addition, the effect of operation temperature and feed sulfur content on membrane performance were also systematically investigated.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2022
·Vol. 15
·期 1
·e202201234
·
IF 5.497
Lu Lin,Guikai Zhang,Liqun Kang,Tao Yu,Yang Su,Guang Zeng,Shengqi Chu,Wenhao Luo
Graphical Methane oxidation : Highly dispersed mononuclear Fe species encapsulated by ZIF-8 (Fe-ZIF-8) afford an optimal turnover rate of ∼45 mol C1 mol Fe −1 h −1 and a formic acid selectivity of ∼97 % in the direct methane oxidation at 323 K. The direct catalytic oxidation of methane into C1 oxygenates is a promising approach for methane valorization. However, the difficulties in CH 4 activation and inhibition of over-oxidation hinder the development of efficient catalysts for this transformation. Herein, highly dispersed Fe species confined by ZIF-8 are developed for the direct transformation of methane into value-added C1 oxygenates with H 2 O 2 as oxidant at 323 K. The as-obtained Fe-ZIF-8 can afford an optimal turnover rate (TOR) of ∼45 mol C1 mol Fe −1 h −1 . Note that the selectivity to HCOOH is ∼97 %, outstanding among the reported Fe-based heterogeneous catalysts. Combined analysis of X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and 57 Fe Mössbauer spectroscopy suggests that the catalytically active sites in Fe-ZIF-8 are mononuclear six-coordinated Fe 3+ species. The confinement of mononuclear Fe species within a porous metal-organic framework material can provide an exquisite, enzyme-like performance for highly selective oxidation of methane towards formic acid under mild conditions.
研究领域:
化学
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催化科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Wen Bo Zhu,Ling Gao,Yu Kang Zhang,Qi Zhang,Ying Hong,Wei Jian Shen,Ying Wang,Jian Hua Zhu
Liquid adsorption of TSNA by ZIF-8 was studied in this paper for the first time, applying the deformable molecular sieve to adsorb and separate TSNA. ZIF-8 can adsorb the bulky NNK molecules whose size exceeds its pore size, whereas NaA and KA zeolites cannot though they have similar pore sizes. Moreover, ZIF-8 selectively adsorbed NNK in solution and reached adsorption equilibrium within 5 min. In contrast, NNN was hard to be adsorbed and easy to be eluted by water, which is useful for the separation of TSNA. The influence of solid-liquid (S/L) ratio and other factors on TSNA liquid adsorption was investigated in detail. When S/L was 0.2, ZIF-8 exerted the highest efficiency and the adsorption capacity per unit surface area reached 12–15 nmol. Through the comparison of adsorption of NNK, NNN and NPYR, it is found that the adsorption of TSNA by ZIF-8 depended on π-π electron interaction mainly, rather than geometric confinement effect. The liquid adsorption curve of NNK conforms to Langmuir isothermal adsorption model, and its saturated adsorption capacity Q m was estimated to be 4.34 mg g −1 , but actually it could reach 3.19 mg g −1 only. In addition, ZIF-8 had a mixing effect in liquid adsorption of TSNA: the presence of NNK promoted the adsorption of NNN slightly. ZIF-8 has the characteristics of fast adsorption and easy elution of TSNA in solution, which is beneficial for removal of TSNA to protect the environment and public health.
研究领域:
环境科学
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公共卫生
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材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-8
·
IF 6.408
Wu Jinmei,Lu Qi,Fu Xiao,Xu Huajian,Wan Pingping,Fu Huimin,Ding Jiqiang,Zhang Jing,Mei Qingsong
A novel nanoassembly was constructed through encapsulating upconversion nanoparticles (UCNPs) into a metal–organic framework structure (ZIF-8), in which doxorubicin (DOX) was absorbed into pores of ZIF-8. The blue emission of UCNPs was quenched by DOX through the fluorescence resonance energy transfer (FRET) strategy. When the nanoprobe was exposed to food samples with different pH values, ZIF-8 collapsed to release DOX molecules, resulting in upconversion recovery. The porous structure of ZIF-8 provides abundant space for DOX absorption, which significantly improves the detection capacities and accuracy. It is shown that the probe has a good linear relationship when pH values vary from 2.5 to 7.4, and can distinguish pH variations as low as 0.5 in real samples. This strategy has been successfully used to determine food spoilage by determination of pH variations. Graphical abstract
研究领域:
分析化学
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食品科学
·
纳米生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 12
·2300200
·
IF 7.9
Qi Ma,Junjie Lou,Xuediao Cai,Jiangshan Feng,Yang Cao,Zhigang Li,Shengzhong (Frank) Liu
The efficiency of perovskite solar cells (PSCs) has surpassed all other thin-film solar cells. It is well known that the mismatch between the perovskite film and electron transport layer is an important factor to damage the stability of PSCs. Herein, an effective modification strategy to improve stability by using FAI@ZIF-8 is demonstrated. It is found that the FAI@ZIF-8 modification reduces the trap-state density of the perovskite by slowly releasing FAI from the ZIF-8 pore. Besides, FAI@ZIF-8 improves energy-level alignment at TiO 2 /perovskite interface, which facilitates electron extraction at the interface. As a consequence, an optimal power conversion efficiency (PCE) of 23.52% is achieved for the FAI@ZIF-8-treated PSCs. After storing under 20–30% relative humidity and room temperature for 2000 h, the FAI@ZIF-8-treated device sustains 96% of its initial PCE; nevertheless, the control device maintains only 73% of its initial PCE under the same conditions. This strategy is helpful to guide the development of high-performance PSCs and promotes commercialization of perovskite materials.
研究领域:
材料科学
·
能源技术
·
光伏器件
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产品关联
DOI
高影响因子
Acta Biomaterialia
·
2023
·
IF 9.7
Yao Yu,Jun Zhang,Wan Huang,Li Luo,Lijun Han,Taolei Sun
High efficiency and spatio-temporal control remains a challenge for multi-modal synergistic cancer therapy. Herein, based on gold nanoparticles (AuNPs) and zeolite-like imidazole skeleton material (ZIF-8), a spatio-temporal controllable photothermal/ chemical dynamic/ chemotherapy three modal synergistic anti-tumor nano-carrier (HAZD) was developed. HAZD has a size of 128.75 ± 11.86 nm, a drug loading ratio of 21.5 ± 2.2% and an encapsulation efficiency of 71.8 ± 1.7%. Stability, acid responsive release character, outstanding catalytic ability to generate ROS, relatively high thermal conversion efficiency up to 62.38% and spatio-temporal controllable abilities are also found within this nano-carrier. Furthermore, HAZD performed good antitumor ability in vivo with the comprehensive effects of photothermal/ chemical dynamic/ chemotherapy. The tumor growth inhibition value is 97.1% within 12 days, indicating its great potential in multi-modal synergistic cancer therapy. Statement of Significance : Cancer remains one of the major culprits that seriously harm human health currently. With the development of materials and nanotechnology, great improvements have been made in multimodal anti-tumor strategies. However, temporal- and spatial-controllable multi-modal synergistic nanocarriers are urgently awaited for efficient and low-toxicity tumor therapy. This article proposes a spatio-temporally controllable three-modal anti-tumor strategy and designs an anti-tumor drug delivery system based on gold nanoparticles (AuNPs) and zeolite-like imidazole skeleton material (ZIF-8), which shows acid-responsive release characteristics, catalytic ability to generate ROS, relatively high thermal conversion efficiency up to 62.38%, as well as spatio-temporal controllable abilities. Moreover, it demonstrates outstanding anti-tumor ability, with a tumor growth inhibition value of 97.1% within 12 days, revealing its significant potential for future personalized and precise anti-tumor treatments.
研究领域:
肿瘤学
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纳米医学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Can He,Meng Cai,Yu Huang,Xiaoqiang Fan,Minhao Zhu
Despite Ti 3 C 2 T x MXene has certified tremendous promise for improving the anti-corrosion/wear of epoxy resin, it falls short of matching the protective standards under long-term extreme conditions. Herein, 2-methylimidazole zinc salt ZIF-8 was grown in-situ on amino-functionalized Ti 3 C 2 T x nanosheets and doped with cerium cations (P + -Ti 3 C 2 T x @ZCe). The Ti 3 C 2 T x -based composite was then parallel arranged within epoxy coating utilizing electrophoretic deposition technique to prepare a novel self-healing intelligent coating (PMX@ZCe). The encapsulation structure of P + -Ti 3 C 2 T x @ZCe was investigated by XRD , FTIR, XPS, FE-SEM, TEM, Zeta potential and TG techniques. Furthermore, the corrosion/wear resistance and self-healing performances of PMX@ZCe were discussed detailedly and the strengthening mechanism of P + -Ti 3 C 2 T x @ZCe was revealed. Results indicate that PMX@ZCe maintains the highest |Z| 0.01Hz value of 1.24 × 10 10 Ω cm 2 after 4 weeks of electrochemical test and exhibits excellent self-healing efficiency of 153 % under artificial scratch, which is ascribed to the release of Ce 3+ /Ce 4+ that could form insoluble protective films at the coating/metal interface. The wear rate of PMX@ZCe is 2.29 × 10 −5 mm 3 /N · m about 56 % lower than that of EP. PMX@ZCe possesses satisfactory corrosion/wear protection performance, thanks to the synergy of good interfacial interaction , parallel-aligned barrier effect and active-passive protection. This work provides a new design thinking for MXene-based intelligent protective coatings that can meet the demands of multi-service environments.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
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