Silver composite iron oxide fiber as well as preparation method and application thereof
A composite iron oxide, iron oxide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of reduced catalytic activity and the inability of simulated enzymes to have high activity at the same time It can overcome the problems of high stability and high production cost, and achieve the effect of overcoming easy agglomeration, overcoming unfavorable recycling and reuse, and high stability.
Active Publication Date: 2017-08-22
QILU UNIV OF TECH
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Problems solved by technology
There are obvious defects in the application of natural enzymes: (1) high production cost
AgNPs also have peroxidase-like activity, but they are prone to agglomeration during use, resulting in a decrease in their catalytic activity
[0005] In summary, the mimetic enzymes prepared by the prior art cannot have high activity and high stability at the same time, so it is of great significance to prepare mimetic enzymes with high activity and high stability
Method used
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[0051] 1.5g polyvinylpyrrolidone (PVP) was dissolved in 15mL ethanol under magnetic stirring, and after the PVP was completely dissolved, a polymer solution was obtained, and 0.45g Fe(NO 3 ) 3 9H 2 O, 0.015g AgNO 3 , 0.46g citric acid was placed in water to prepare 4.5mL salt solution, the salt solution was added to the polymer solution, and stirred on a constant temperature magnetic stirrer until there were no small bubbles in the solution, and a uniform, yellow-brown solution with a viscosity of 30Pa was obtained. · s precursor sol solution. Inject the precursor sol solution into the needle tube, set the voltage of the electrospinning machine to 20KV, the receiving distance to 20cm, and the advancing speed to 0.002mm / s; collect the prepared gel fiber after spinning and place it at 80°C Dry in the oven for at least 12 hours. The fiber is calcined to remove impurities and organic matter, and the final product obtained is Ag-Fe 2 o 3 The composite fiber, wherein the calci...
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Abstract
The invention discloses a silver composite iron oxide fiber as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving polyvinylpyrrolidone in an organic solvent so as to prepare a polymer solution; dissolving ferric nitrate, silver nitrate and citric acid into water so as to prepare a salt solution; mixing the polymer solution and the salt solution, and uniformly stirring so as to prepare a precursor sol solution with preset viscosity; preparing the precursor sol solution into gel fibers by adopting an electrospinning technique; and drying and calcining the gel fibers, thereby obtaining the silver composite iron oxide fiber after calcining, wherein a mass ratio of the silver to iron to citric acid is 1:(5-8):(45-50); and the calcining process comprises the sub-steps of heating to the temperature of 300+ / -10 DEG C, maintaining the temperature for a period of time, heating to the temperature of 450+ / -10 DEG C, and then maintaining the temperature for a period of time. The silver composite iron oxide fiber prepared by the preparation method has peroxidase-like activity and is high in enzymatic activity and high in stability.
Description
technical field [0001] The invention relates to a silver composite iron oxide fiber, a preparation method and application thereof. Background technique [0002] Enzymes are proteins with specificity and high catalytic activity produced in organisms. Various life activities such as growth, development, and reproduction of organisms are inseparable from the catalysis of enzymes. In order to distinguish them from the analogs mentioned later in this application Enzymes, which are referred to herein as native enzymes. Peroxidase is a kind of oxidoreductase extracted from plants, animals, and microorganisms. It takes heme as a prosthetic group and participates in the physiological metabolism in organisms. It can catalyze H 2 o 2 Hydrogen oxide donor substrate. In the process of life activities, peroxidase mainly catalyzes the oxidation of oxides or peroxides in organisms to decompose other toxins. The widely used peroxidase is horseradish peroxidase (HRP) extracted from natura...
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IPC IPC(8): D01F9/08B01J23/89B01J35/06
CPCB01J23/8906B01J35/06D01F9/08
Inventor 孙海燕吕洪水周湘竹陶芙蓉张志良
Owner QILU UNIV OF TECH
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