Adsorption technology based on ethane‐selective materials is a promising alternative to energy‐intensive cryogenic distillation for separating ethane (C2H6) and ethylene (C2H4). We employed a pore ...engineering strategy to tune the pore environment of a metal–organic framework (MOF) through organic functional groups and boosted the C2H6/C2H4 separation of the MOF. Introduction of amino (−NH2) groups into Tb‐MOF‐76 not only decreased pore sizes but also facilitated multiple guest‐host interactions in confined pores. The NH2‐functionalized Tb‐MOF‐76(NH2) has increased C2H6 and C2H4 uptakes and C2H6/C2H4 selectivity. The results of experimental and simulated transient breakthroughs reveal that Tb‐MOF‐76(NH2) has significantly improved one‐step separation performance for C2H6/C2H4 mixtures with a high C2H4 (>99.95 %) productivity of 17.66 L kg−1 compared to 7.53 L kg−1 by Tb‐MOF‐76, resulting from the suitable pore confinement and accessible −NH2 groups on pore surfaces.
By virtue of a pore engineering strategy based on isoreticular chemistry, an amino‐functionalized metal–organic framework (MOF) with suitable pore confinement and more binding sites improved the ethane/ethylene separation performance compared to the parent MOF.
One‐step C2H4 purification from ternary C2H6/C2H4/C2H2 mixtures by a single adsorbent is of great industrial significance, but few adsorbents achieve this separation. Herein, we report a robust ...metal–organic framework (MOF) that possesses methyl‐decorated nonpolar pores and shows one‐step C2H4 purification (purity >99.9 %) from binary C2H6/C2H4 mixtures and ternary C2H6/C2H4/C2H2 mixtures. The methyl groups in pores provide a suitable pore environment to simultaneously enhance the adsorption capacity for C2H2 and C2H6 compared to C2H4. Simulations revealed the multiple interactions between C2H6 or C2H2 molecules and the pore wall, while the interactions with C2H4 molecules are weak and also unfavorable due to the repulsion from methyl groups in pores. The MOF displays high C2H6 and C2H2 uptakes and benchmark C2H6/C2H4 selectivity (2.2), surpassing all of the reported MOFs for one‐step C2H4 purification from ternary C2H6/C2H4/C2H2 mixtures.
The combination of nonpolar pore environment and accessible active sites in a metal–organic framework affords benchmark C2H6/C2H4 selectivity and realizes one‐step C2H4 purification from ternary C2H6/C2H4/C2H2 mixtures.
A robust cluster-based Eu-MOF has been created by a tetrazolyl-carboxyl linker, which shows great chemical and thermal stability and multiple functions of fluorescent sensor for the detection of ...antibiotics (MDZ, DMZ) and pesticides (DCN).
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•A robust cluster-based Eu-MOF as a fluorescence probe.•Resistance to water, organic solvents and wide pH value range.•Selective detection of MDZ, DMZ and DCN with low detection limit, rapid response.•Detected MDZ and DMZ in calf serum and sensed DCN in lake water.•Combining experiments and calculations to study the sensing mechanism.
As a hot issue of global concern, the abuse of organic pollutants, including pesticides and antibiotics poses a great threat to the human health and ecological environment. Effective and accurate detection of these species is of profound significance in many fields. In this work, a novel 3D metal-organic framework (MOF) Eu2(dtztp)(OH)2(DMF)(H2O)2.5·2H2O (1) was solvothermally synthesized. 1 is a three-dimensional framework based on tetranuclear Eu4(μ3-OH)4(μ2-OH2)8+ clusters, and reveals the great chemical stability and excellent tolerance in water and organic solvents. The MOF also shows strong fluorescence that was undisturbed by the pH in aqueous water (pH = 3–12). Importantly, 1 can quickly detect metronidazole (MDZ) and dimetridazole (DMZ) antibiotics as well as 2,6-dichloro-4-nitroaniline (DCN) pesticide in water with good recyclability and low detection limit. MDZ, DMZ and DCN were also successfully detected in calf serum and lake water, respectively. The mechanism of fluorescence quenching was disclosed through the combination of experiments and density functional theory calculations.
This paper proposes a novel magnetic field sensor based on a microfiber coupler (MFC) combined with a magnetic fluid (MF) in a Sagnac loop formed from a polarization maintaining fiber (PMF). Thanks ...to the small (~2.6 μm) waist diameter of the MFC, the resulting interference is strongly influenced by the presence of the MF and this leads to the desirable high sensitivity of the structure to the applied magnetic field. The maximum magnetic field sensitivities of -100 pm/mT and -488 pm/mT have been experimentally demonstrated with the PMF lengths of 75 cm and 20 cm respectively in the range of magnetic field strengths from 0 to 200 mT. The dependence of the magnetic field orientation on the performance of the proposed sensor was also examined. The proposed magnetic field sensor is advantageous for applications requiring higher sensitivity over a wide magnetic field range.
Lonicera japonica Thunb, rich in chlorogenic acid (CHA), is used for viral upper respiratory tract infection treatment caused by influenza virus, parainfluenza virus, and respiratory syncytial virus, ...ect in China. It was reported that CHA reduced serum hepatitis B virus level and death rate of influenza virus-infected mice. However, the underlying mechanisms of CHA against the influenza A virus have not been fully elucidated. Here, the antiviral effects and potential mechanisms of CHA against influenza A virus were investigated. CHA revealed inhibitory against A/PuertoRico/8/1934(H1N1) (EC
= 44.87 μM), A/Beijing/32/92(H3N2) (EC
= 62.33 μM), and oseltamivir-resistant strains. Time-course analysis showed CHA inhibited influenza virus during the late stage of infectious cycle. Indirect immunofluorescence assay indicated CHA down-regulated the NP protein expression. The inhibition of neuraminidase activity confirmed CHA blocked release of newly formed virus particles from infected cells. Intravenous injection of 100 mg/kg/d CHA possessed effective antiviral activity in mice, conferring 60% and 50% protection from death against H1N1 and H3N2, reducing virus titres and alleviating inflammation in the lungs effectively. These results demonstrate that CHA acts as a neuraminidase blocker to inhibit influenza A virus both in cellular and animal models. Thus, CHA has potential utility in the treatment of the influenza virus infection.
A quinoline-linked and ionic liquid-decorated covalent organic framework was prepared by incorporation of a multicomponent Povarov reaction and postsynthetic modification. The imidazolium and ...sulfonic acid-decorated COF-IM-SO3H can be a highly efficient Brønsted acid catalyst to promote the Biginelli reaction under solvent-free conditions in a heterogeneous way. In addition, a scaled-up Biginelli reaction has been readily realized over a COF-IM-SO3H@chitosan aerogel-based cup reactor.
A simple, cost effective high-temperature sensor (up to 1000 °C) based on a hollow core fiber (HCF) structure is reported. It is configured by fusion splicing a short section of HCF with a length of ...few millimeters between two standard single mode fibers (SMF-28). Due to multiple beam interference introduced by the cladding of the HCF, periodic transmission dips with high spectral extinction ratio and high-quality (Q) factor are excited. However, theoretical analysis shows that minor variations of the HCF cladding diameter may result in a significant decrease in the Q factor. Experimental results demonstrate that the position of periodic transmission dips are independent of the HCF length, but spectral Q factors and transmission power varies with different HCF lengths. A maximum Q factor of 3.3 × 10 4 has been demonstrated with large free spectral range of 23 nm and extinction ratio of 26 dB. Furthermore, the structure is proved to be an excellent high-temperature sensor with advantages of high sensitivity (up to 33.4 pm/ °C), wide working temperature range (from room temperature to 1000 °C), high resolution, good stability, repeatability, relatively low strain sensitivity (0.46 pm/με), low cost, and a simple and flexible fabrication process that offers a great potential for practical applications. A thorough theoretic analysis of the HCF-based fiber structure has been proposed. The experimental results are demonstrated to be well matched with our simulation results.
Gratings inscribed in polymer optical fibre (POF) have attracted remarkable interest for many potential applications due to their distinctive properties. This paper overviews the current state of ...fabrication of POF gratings since their first demonstration in 1999. In particular we summarize and discuss POF materials, POF photosensitivity, techniques and issues of fabricating POF gratings, as well as various types of POF gratings.
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