Preparation method and application of ZnO/CNF composite material

Abstract

The invention belongs to the technical field of nano material preparation and particularly relates to a preparation method and application of a ZnO / CNF composite material. The preparation method of the ZnO / CNF composite material comprises the following steps of (1) dissolving polyvinyl alcohol in water to form an aqueous solution of the polyvinyl alcohol; (2) adding a soluble zinc salt into the aqueous solution of the polyvinyl alcohol under the condition of stirring to obtain a spinning solution; (3) performing electrospinning and drying on the spinning solution to obtain ZnO / CNF precursor nanofibers; (4) calcining the ZnO / CNF precursor nanofibers under the condition of N2 to prepare the ZnO / CNF composite material. The ZnO / CNF composite material prepared by means of the method has good composite performance, ZnO can be uniformly loaded on CNF, the fibers have uniform uniformity and high stability, and the composite material has excellent photocatalytic degradation efficiency.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method and application of a ZnO / CNF composite material. Background technique [0002] Photocatalytic oxidation is an advanced oxidation technology developed in recent decades, which combines a specific light source (such as ultraviolet light) with a catalyst (TiO 2 , ZnO or CdS, etc.) combined action to degrade organic wastewater. Compared with the traditional water treatment technology, which mainly focuses on the separation, concentration and phase transfer of pollutants, it has obvious advantages such as energy saving, high efficiency and complete degradation of pollutants. [0003] At present, the photocatalytic materials are mainly semiconductor oxides, but they are limited by high working temperature, and nanostructured materials are widely used in photocatalytic applications due to their advantages of lower working temperature, l...

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Problems solved by technology

[0008] For the existing technology, such as the article "High Photocatalytic Activity of ZnO-Carbon Nanofiber Heteroarchitectures" published by Jingbo Mu, PAN is obtained by electrospinning to obtain PAN nanofibers, and then carbonized to obtain carbon nanofibers, and then acetic acid is hydrothermally Zinc and carbon nanofibers are hydrothermally reacted to obtain ZnO / CNFs. This method is complex in operation and high in production cost, and the prepared ZnO covers the surface of carbon nanofibers, which is easy to fall off and has poor stability.

For example, in the article "Solution blowing of ZnO nanoflake-encapsulated carbon nanofibers as electrodes for supercapacitors" published by Shaojun Shi, zinc acetate / PAN is obtained by purging, and ZnO / CNF is obtained after calcination. This method is not easy to realize industrialization

[0009] Chinese patent CN108760847A discloses a method for preparing zinc oxide-carbon nanofiber composite material and its modified electrode by electrospinning and high-temperature carbonization. After mixing ZnO nanoparticles with PAN spinning solution, electrospinning is carried out, and then obtained ZnO / PAN nanofibers; after calcining and carbonizing ZnO / PAN composite nanofibers, ZnO / CNF composite materials are obtained. Due to the ZnO nanoparticles, it is very easy to agglomerate. After mixing the PAN spinning solution, make it in the spinning solution Inhomogeneous dispersion leads to poor composite effect of ZnO and CNF in the prepared ZnO / CNF composite material, and there may be a situation where some of the carbon nanofibers are not loaded with ZnO, resulting in poor performance

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