Preparation method of porous nanofiber membrane loaded atomic-scale active site catalyst

Abstract

The invention discloses a preparation method of a porous nanofiber membrane loaded atomic-scale active site catalyst. According to the catalyst, a polytetrafluoroethylene (PTFE) porous nanofiber membrane is used as a carrier, precious metal or transition metal atoms are used as active components, the stable dispersion of metal active atoms on a PTFE porous nanofiber membrane carrier in the form ofsingle or a plurality of atoms is realized through a simple electrospinning-impregnation two-step method, and the utilization rate of the metal atoms and the number of interfacial active sites can bemaximized such that excellent catalytic performance is shown. The catalyst can be used for catalytic oxidation degradation of organic pollutants in water and atmosphere at normal temperature, and more than 90% organic pollutants can be removed without any external energy input.

Description

technical field [0001] The invention belongs to the field of catalyst technology and the field of air and water pollution control, and in particular relates to a preparation method of an atomic-level active site catalyst supported by a porous nanofiber membrane. Background technique [0002] With the development of industrialization, a large amount of organic pollutants are discharged into the water and atmospheric environment, causing damage to the water ecological environment and serious air pollution. Traditional organic pollutant treatment technologies mainly include adsorption, absorption, membrane separation, etc., but there are often problems such as high cost, poor universality, low efficiency, and secondary pollution. Therefore, thermal incineration, photocatalytic oxidation, bioremediation, and plasma Technology has become the mainstream, but all of them require the input of light, electricity, heat and other energy from the outside to open the molecular bonds of o...

AI Technical Summary

Problems solved by technology

However, metal atoms dispersed in the form of atoms have high surface Gibbs free energy, making them easy to agglomerate into nanoclusters and gradually deactivate during the preparation and reaction process.

In addition, most of the catalysts are in the form of powder, which will lead to the problem of pressure drop in the catalytic bed during the catalytic oxidation of gaseous organic pollutants, and when they are used to catalyze the degradation of organic pollutants in water, they are directly put into the water environment and are difficult to recover directly. , poor mechanical properties, etc.

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