Graphene/single-walled carbon nanotube/hemin nanocomposite and preparation method and application thereof

Abstract

The invention discloses a graphene / single-walled carbon nanotube / hemin (RGO-SWCNT-Hemin) nanocomposite, a preparation method of the nanocomposite and application of the nanocomposite for detection of the concentration of hydrogen peroxide. Firstly, hemin is dissolved in tetrahydrofuran in an ultrasonic mode and added to distilled water, and NaNO3 and SWCNTs continue to be added in an ultrasonic mode; two high-purity graphite rods serving as a positive electrode and a negative electrode are inserted into mixed liquor, 10V direct voltage is applied to the two graphite rods under ultrasonic conditions, electrolysis is conducted for 8 hours, sediment on the lower layer of the liquor is centrifugally removed after the reaction finishes, the mixed liquor is then subjected to centrifugal washing, and the RGO-SWCNT-Hemin nanocomposite is obtained. There is no literature report about the nanocomposite at current, the preparation method is simple, and the nanocomposite can be produced on a large scale. Besides, the H2O2 detection sensitivity of the nanocomposite is high.

Description

technical field [0001] The invention relates to the preparation of a graphene composite material, in particular to a graphene / single-wall carbon nanotube / hemin nanocomposite material and a preparation method and application thereof. Background technique [0002] Graphene is a two-dimensional carbon atom crystal with a thickness of only 0.34nm. Graphene's single-atom thickness and two-dimensional planar structure provide its extremely large surface area so that it can support a large number of various molecules, including metals, biomolecules, and fluorescent molecules. Moreover, the stable lattice structure of graphene makes it have excellent conductivity, and it has unique advantages in the field of high-sensitivity detection. Hemin is the catalytic center of many proteins, such as cytochrome, peroxidase, hemoglobin and myosin, which can catalyze a series of oxidation reactions like peroxidase. [0003] In the prior art, there have been some reports on the preparation of ...

AI Technical Summary

Problems solved by technology

This method uses toxic reducing reagents, which is easy to pollute the environment, and the added toxic reagents may affect the safety of later applications

[0004] In addition, the national standard method for hydrogen peroxide detection is potassium permanganate titration, which is cumbersome to operate and slow to measure.

Other methods, such as spectrophotometry and fluorescence (Electroanalysis, 2011, Vol. 23, p. 1821), are sensitive in analysis and faster in detection, but the equipment is more expensive

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