Long Yu,Hongxia Chen,Ji Yue,Xinfeng Chen,Mingtai Sun,Jing Hou,Khalid A. Alamry,Hadi M. Marwani,Xiangke Wang,Suhua Wang
Metal-organic framework is an extended coordination compound with repeating coordination entities and voids, which shows potential applications in gas storage, separation, catalysis, and etc. This work reports the synthesis of a new functional metal-organic framework of pyromellitic acid and europium , and its application in fluorescence sensing of doxycycline , a broad-spectrum polyketide antibiotic on the basis of fluorescence turn-on method. The metal-organic framework was initially non-fluorescent, however, with the addition of doxycycline, the system exhibited significant fluorescence enhancement at 526 nm and 617 nm, where both fluorescence intensities showed good linear correlations with the doxycycline concentration, suggesting the possibility for direct two-channel detection without any sensitization materials such as metal particles or surface-modified quantum dots . More interestingly, the unique fluorescence response of the system could discriminate doxycycline from other tetracycline antibiotics with high selectivity, and a limit of detection (LOD) was estimated to be 47 nM. It has been further demonstrated that the material has been successfully applied as sensing materials for selective determination of doxycycline in real samples of fish and urine.
Cobalt-based metal–organic frameworks (Co-MOFs) supported by pyromellitic acid (PMA) were synthesized using a facile one-pot solvothermal method. Morphologies and sizes were tuned by assembly of Co-MOFs in different solvent ratios. Multilayered derivatives were obtained by calcination of Co-MOFs at 350 °C under argon and used as anode material for lithium-ion batteries (LIBs), showing a high reversible specific capacity (1116.7 mA h g−1 after 100 cycles at a current density of 200 mA g−1). The excellent electrochemical performance may be attributed to the specific structure formed during calcination, that is to say, the inner layer of the material retained the porous MOFs, and a small amount of oxide and carbon layers wrapped around the outer layer of the MOFs.
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