JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Daile Zhang,Jianghua Zhang,Mingdi Pan,Yun Wang,Ting Sun
Electrochemical deposition is a facile technique to fabricate metal organic frameworks (MOFs) based materials in a short reaction time under mild conditions. In this work, novel necklace-like zeolitic imidazole framework@multiwalled carbon nanotubes (ZIF-8@MWCNTs) composite was synthesized by electrochemical method for the first time and then used as precursor for subsequent carbonization and acid treatment. The resultant porous carbon material (C-ZIF-8@MWCNTs) maintained the necklace-like structure with a high surface area of 1063.2 m 2 g −1 . When used as electrode material for supercapacitor , the C-ZIF-8@MWCNTs demonstrated a high specific capacitance of 259.2 F g −1 at the current density of 0.5 A g −1 . Further, the capacitance retention could reach 92% after 5000 cycles under the current density of 15 A g −1 . Due to the large specific surface area of the porous carbon derived from ZIF-8 and the intrinsic high conductivity, the C-ZIF-8@MWCNTs displayed good rate ability and cycle performance. The current work can expand the method to synthesize functional MOFs-based materials for advanced applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 45
·期 6
·3095-3101
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IF 3.288
Yilin Yin,Jingchao Liu,Zengnan Wu,Ting Zhang,Zenghe Li
As one of the most essential semiconductors, ZnO has been widely used for solar cells, photocatalysis, environmental remediation, etc. Doping and morphology control of ZnO can significantly improve the efficiency of its photocatalytic performance. Tetracycline hydrochloride (TC) is widely used in medical and veterinary fields. Its excess use harms the environment and human health. Herein, we have successfully prepared Cu2O-doped ZnO with a porous structure by calcination using ZIF-8 as the precursor. After exposure to visible light (λ >420 nm) for 75 min, these photocatalysts exhibited a reasonable TC degradation rate (∼83.6%). Compared with ZnO, the Cu2O-doped ZnO introduces a p–n heterojunction and increases oxygen vacancies, which reduces the band gap and electron–hole recombination. Therefore, the photocatalytic efficiency for TC and PEC performance have been improved.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Jiaojiao Cao,Chengbin Guo,Xingpeng Guo,Zhenyu Chen
A zeolitic imidazole framework-8 (ZIF-8) derivative was synthesized and developed as the corrosion inhibitor of copper in 0.5 mol/L NaCl solution, and its inhibition performance was investigated by electrochemical measurement and surface analysis . Results show that the ZIF-8 derivative could effectively inhibit copper from corrosion, and the inhibition efficiency was 87.2% at an optimal ZIF-8 derivative concentration of 45 mg/L. The corrosion inhibition mechanism of the ZIF-8 derivative could be explained as follows: the amino functional groups and the π-system formed by aromatic rings of the ZIF-8 derivative were tightly adsorbed on the copper substrates, which systematically formed a hydrophobic film, thereby effectively inhibiting the corrosion caused by aggressive ions.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Baozhong Lü,Weijie Qi,Mingsheng Luo,Qinglong Liu,Lin Guo
The preparation of highly active and stable catalysts for syngas conversion is a major challenge for Fischer–Tropsch synthesis (FTS). Herein, we report a strategy to prepare a highly dispersed Co-embedded porous carbon nanocage (CoPCN) structure derived from a core–shell metal–organic framework (MOF) ZIF-8@ZIF-67 precursor. High Co loading (over wt 30%) is achieved while maintaining an optimal dispersion and particle size of the active Co phase when a ZIF-8@ZIF-67 is pyrolyzed at 920 °C. Besides, the porous channels and hollow structures of the CoPCN strengthen the diffusion of reactants and the hydrocarbon product, enhancing the C5+ selectivity and CO conversion. The CoPCN shows high stability in FTS with a CO conversion of 18.3%, 80.2% selectivity for long-chain hydrocarbons (C5+), and 8.9% selectivity for short-chain hydrocarbons (C2–C4) after 100 h time on stream. Compared with other MOF-derived FTS catalysts, CoPCN-920 can achieve higher C5+ selectivity at a lower reaction temperature. The present work uncovers the relationship between the porous structure and catalytic performance, providing an efficient method to prepare promising materials for enhanced FTS stability, activity, and selectivity.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Lei Cheng,Puxuan Yan,Xiulin Yang,Huahong Zou,Hu Yang,Hong Liang
Deeply understanding the structure and electrical properties of ZIF-8 is very important due to many practical applications of porous materials . We present the crystal structure and microstructure details of ZIF-8 prepared in three different solvents. The solvents play an important role on grain growth of ZIF-8, furthermore, a small fraction of monoclinic phase can be found in the ZIF-8s prepared in water or in amonium hydroxide. Radio-frequency dielectric and impedance spectra studies of dynamic dielectric response of ZIF-8s indicate two additional dielectric relaxation processes associated with the introduced water molecules in as-prepared samples. The dielectric response can be described by the combination of the dc conductivity, the universal dielectric response, the Cole-Cole relation and intrinsic response. The results exhibit the solvents make an important influence on the electrical properties due to different contents water in ZIF-8s. Our results will pave a way to modify the dielectric property of ZIF-based dielectrics in radio-frequency applications.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Shuai Fan,Huiyuan Cheng,Manman Feng,Xuemei Wu,Zihao Fan,Dongwei Pan,Gaohong He
The conversion of CO 2 electrocatalytic hydrogenation into energy-rich fuel is considered to be the most effective way to carbon recycle. Nitrogen-doping carbonized ZIF-8 is proposed as carrier of the earth-rich Sn catalyst to overcome the limit of electron transfer and CO 2 adsorption capacity of Sn. Hierarchically porous structure of Sn doped carbonized ZIF-8 is controlled by hydrothermal and carbonization conditions, which induces much higher specific surface area than that of the commercial Sn nanoparticle (1003.174 vs. 7.410 m 2 ·g −1 ). The shift of nitrogen peaks in X-ray Photoelectron Spectroscopy spectra indicates interaction between ZIF-8 and Sn, which induces the shift of electron cloud from Sn to the chemical nitrogen to enhance conductivity and regulate electron transfer from catalyst to CO 2 . Lower mass transfer resistance and Warburg resistance are investigated through EIS, which significantly improves the catalytic activity for CO 2 reduction reaction (CO 2 RR). Onset potential of the reaction is reduced from −0.74 V to less than −0.54 V vs. RHE. The total Faraday efficiency of HCOOH and CO reaches 68.9% at −1.14 V vs. RHE, which is much higher than that of the commercial Sn (45.0%) and some other Sn-based catalyst reported in the literature.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Zhen Zhang,Sige Li,Dan Qiao,Nan Hu,Ying Gu,Qiliang Deng,Shuo Wang
Black phosphorus (BP) nanosheet is easily oxidized by oxygen and water under ambient environment, thus, reliable BP passivation techniques for biomedical applications is urgently needed. A simple and applicable passivation strategy for biomedical applications was established by encapsulating BP nanosheet into zeolitic imidazole framework-8 (ZIF-8). The resulted BP nanosheet in ZIF-8 (BP@ZIF-8) shows not only satisfied chemical stability in both water and phosphate buffered saline (PBS), but also excellent biocompatibility. Notably, BP nanosheet endows the prepared BP@ZIF-8 with prominent photothermal conversion efficiency (31.90%). Besides passivation BP, ZIF-8 provides the BP@ZIF-8 with high drug loading amount (1353.3 mg g–1). Moreover, the loaded drug can be controlled release by pH stimuli. Both in vitro and in vivo researches verified the resulted BP@ZIF-8 an ideal candidate for tumor multimodal treatments.
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PubMed
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Pascal Habimana,Yanjun Jiang,Jing Gao,Jean Bernard Ndayambaje,Osama M. Darwesh,Jean Pierre Mwizerwa,Xiaobing Zheng,Li Ma
The continuous use of chemical dyes in various industries, and their discharge into industrial effluents, results in severe problems to human life and water pollution. Laccases have the ability to decolorize dyes and toxic chemicals in industrial effluents as green biocatalysts. Their possible industrial applications have been limited by poor reusability, low stability, and loss of free laccase action. In this research, laccase was immobilized on zeolitic imidazolate framework coated multi-walled carbon nanotubes (Laccase@ZIF-8@MWCNTs) via metal affinity adsorption to develop an easy separable and stable enzyme. The optimum reaction conditions for immobilized laccase are at a pH of 3.0 and a temperature of 60 °C. The immobilized laccase was enhanced in storage and thermal stability. The results indicated that Laccase@ZIF-8@MWCNTs still maintained 68% of its original activity after 10 times of repeated use. Most importantly, the biocatalytic system was applied for decolorization of different dyes (20 mg·L −1 ) without a mediator, and up to 97.4% for Eriochrome black T and 95.6% Acid red 88 was achieved in 25 min. Biocatalysts with these properties may be used in a variety of environmental and industrial applications.
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DYES AND PIGMENTS
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2021
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IF 4.889
Yong-Qi Cai,Gao Li
Many fluorometric methods have been developed for detecting tyrosinase activity, yet many of them require the sophisticated synthesis of relatively complex fluorescent molecules. Here, we report the utilization of a label-free supramolecular tandem assay for measuring tyrosinase activity based on an easily available reporter pair. Cucurbit[8]uril (CB[8]) can bind with thioflavin-T (ThT) and increase its fluorescence intensity , while the tripeptides YLA and Dopa-LA can decrease the fluorescence intensity of CB[8]-ThT complex. YLA and Dopa-LA can be oxidized by tyrosinase, and the products have lower binding affinity with CB[8], leading to an increase of fluorescence in the intensity of CB[8]-ThT-YLA or Dopa-LA. We were able to continuously monitor tyrosinase activity with CB[8]-ThT-YLA or Dopa-LA.
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EUROPEAN JOURNAL OF PHARMACOLOGY
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2019
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IF 3.17
Lihong Ruan,Ningning Jiang,Fengyang Guo,Hui Xu,Jingmin Zhang,Jingchun Sun
The antiresorptive agents still are the mainstay of osteoporosis treatment. This study aimed to investigate the efficacy of recombinant Lingzhi-8 (rLZ-8) on osteoclast in vitro and bone resorption in vivo . The rLZ-8 protein was derived from Ganoderma lucidum transformation and produced by a genetic system. Receptor activator of nuclear factor kappa-Β ligand induced RAW 264.7 cells to differentiate into osteoclastic cells in vitro . Cells were exposed to different doses of rLZ-8 for 7 days to measure differences of osteoclastic differentiation, apoptosis rate and gene expression. rLZ-8 was labeled with Alexa Fluor 568 to observe its intracellular distribution under super-resolution light microscopy. In addition, retinoic acid was administered to female rats for 14 days to develop osteopenia changes. Different doses of rLZ-8 were simultaneously administered to rats treated with retinoic acid to observe changes of bone mineral density, biochemical parameters and organ weight ratio. Results indicated that rLZ-8 regulated receptor activator of nuclear factor kappa-Β (RANK) - tumor necrosis factor receptor-associated factor 6 (TRAF6) - c-Jun N-terminal kinase (JNK) signaling pathway, by which rLZ-8 inhibited osteoclastic differentiation and promoted osteoclastic apoptosis. Through 3D-structured illumination microscopy, it was observed that rLZ-8 entered RAW264.7 cells and accumulated gradually into the cytoplasm but little into nucleus. Administration with rLZ-8 reversed loss of bone mass and improved ALP activity in osteoporotic rats. Low-to high-dose rLZ-8 treatments displayed little toxic effects on rat organs and did not seem to impact their overall health. All data suggested that rLZ-8 has possible action against osteoporosis.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Xianyu Lei,Yang Cao,Qianlin Chen,Xianquan Ao,Yu Fang,Baojun Liu
Tetracycline hydrochloride (TC) is a broad-spectrum antibiotic extensively used in medical and veterinary fields. However, its excess harms the environment and human health. Recently, construction of CuO/ZnO heterojunctions has a very good effect in the treatment of organic matter in water. In this study, we used zeolite imidazolate framework (ZIF-8) as initial material to synthesize porous and hollow CuO/ZnO photocatalysts for catalytic degradation of TC. The results show that the synthesized CuO/ZnO has the characteristics of porous hollow polyhedron when the molar ratio of Cu and Zn is 0.1. Obviously, photocatalytic degradation rate was better comparing to CuO/ZnO nanoparticles as well as pure ZnO and CuO particles, respectively, which could reach 87% at 60 min under visible light (λ > 420 nm) and has good stability. Porous hollow CuO/ZnO composites are very promising for effective and environmentally friendly degradation of tetracycline hydrochloride in water.
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JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 6
·1-11
·
IF 1.53
Zhan Yifei,Guan Xinmei,Ren Erhui,Lin Shaojian,Lan Jianwu
In this work, polyacrylonitrile (PAN) nanofibers were utilized to prepare metal-organic framework (MOF) nanofibrous mats. Herein, 2-methylimidazole (2-MI) was mixed in polymeric solution for electrospinning. Subsequently, zeolitic imidazolate framework (ZIF-8) nanocrystals were growth on the surface of PAN nanofibers through post-treatment. To confirm the structures, ZIF-8/PAN nanofibrous mats were investigated by FTIR, XRD, SEM, and TGA measurements. The results presented uniform ZIF-8/PAN nanofibrous mats were fabricated. Further, ZIF-8/PAN nanofibrous mats were employed for dye adsorption using methylene blue (MB) and malachite green (MG) as models. The optimum dye-adsorption conditions were investigated. The results shown the optimum concentration, temperature and pH value of for MB adsorption were 50 mg/L, 30 °C and pH = 11; for MG absorption were 300 mg/L, 30 °C and pH = 5, respectively. Meanwhile, the results displayed prepared ZIF-8/PAN nanofibrous mats presented well adsorption capacity to MG with a quick adsorption rate, which reached to 1531.94 mg/g. Moreover, MB and MG adsorption isotherms of ZIF-8/PAN nanofibrous mats were best fitted by the Langmuir isotherm model, and the results presented pseudo second-order kinetic equation was more consistent with the MB and MG adsorption processes of the adsorbent. Additionally, ZIF-8/PAN nanofibrous mats are successfully degradation MB under xenon light irradiation.
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危险品化学品经营许可证（带存储）