A metal-organic framework-zirconia fiber composite material and its preparation method and application
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A metal-organic framework and zirconia fiber technology, applied in the field of composite materials, can solve the problems of difficult to guarantee the stability of composite materials, low mass fraction of MOFs, and large volume of substrates, and achieve excellent thermal stability and chemical stability. Good reusability, good flexibility
Active Publication Date: 2021-10-08
SHANDONG UNIV
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Problems solved by technology
In this kind of composite material, the substrate occupies a large volume, the mass fraction of MOFs is low, and it is not flexible; adding polyvinyl alcohol binder and drying at low temperature to fix MOFs is suitable for the application of gas adsorption, but if it is used in water In medium and long-term use, the stability of composite materials is difficult to guarantee
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Embodiment 1
[0051] A preparation method of UIO-66-zirconia fiber composite material, comprising the steps of:
[0052] (1) Weigh PAZ, yttrium nitrate hexahydrate, PEO, and methanol in a weight ratio of 100:20:1:200, fully mix and dissolve at 30°C under stirring conditions, and obtain a clear PAZ precursor spinning sol;
[0053] (2) Add the PAZ precursor spinning sol obtained in step (1) into the syringe, use a stainless steel needle (type 23G) with an inner diameter of 0.33mm, and advance at a speed of 1.2mL / h at a spinning temperature of 20°C , the spinning humidity is 30%, the spinning voltage is 10kV, the electrospinning is carried out, the receiving distance is 20cm, and the zirconia precursor fiber is collected;
[0054] (3) Put the zirconia precursor fiber obtained in step (2) on the setter in the program-controlled sintering furnace, raise the temperature to 600°C at a heating rate of 1°C / min, keep it for 2h, and remove the zirconia precursor fiber. Organic matter, natural cooling...
Embodiment 2
[0058] The preparation of the UIO-66-zirconia fiber composite material was the same as in Example 1, except that the methanol in step (1) was replaced with ethanol.
Embodiment 3
[0060] The preparation of UIO-66-zirconia fiber composite material is the same as in Example 1, except that in step (1), PAZ, yttrium nitrate hexahydrate, PVP, methyl alcohol are weighed, and the weight ratio is 100:0:2: 200, fully mixed and dissolved at 30°C under stirring conditions to obtain the PAZ precursor spinning sol.
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Abstract
The invention relates to a metal organic framework-zirconia fiber composite material and a preparation method and application thereof. The composite material in the present invention is a composite of zirconia fibers and MOFs particles, with zirconia fibers as the base material, MOFs particles grow on the zirconia fibers in situ, the diameter of the zirconia fibers is 200nm to 2 μm, and the diameter of the MOFs particles is 300nm ~ 6μm. The zirconia fiber obtained by electrospinning in the present invention has excellent thermal stability and chemical stability, and can withstand the conditions of MOFs solvothermal growth, because the zirconia and zirconium hydroxide in the substrate fiber can form a strong The covalent bond becomes the anchor point for the growth of MOFs. The MOFs of the obtained composite material are firmly combined with the substrate fibers, and are not easy to fall off during the adsorption process. It also retains the appearance and structural characteristics of the substrate material zirconia fibers, showing good flexibility. And fluffy, can adapt to a variety of use environment.
Description
technical field [0001] The invention relates to a metal organic framework (MOFs)-zirconia fiber composite material and a preparation method and application thereof, belonging to the technical field of composite materials. Background technique [0002] Metal Organic Frameworks (MOFs) compounds are a class of crystalline porous materials with a periodic network structure formed by inorganic metal ions or metal clusters and organic ligands through coordination bonds. MOFs materials have a special microporous and mesoporous structure, which has the advantages of large specific surface area, high porosity, and adjustable structure. Among the many kinds of MOFs materials, zirconium-based MOFs represented by UIO-66 reported by the University of Oslo in Norway have shown outstanding physical and chemical stability. UIO-66 is one of the few MOFs that can exist stably in water. It can also maintain its structure in organic solvents such as alcohols, N,N-dimethylformamide (DMF), aceto...
Claims
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