Photocatalytic inorganic nanoparticle/polydopamine/polymer self-cleaning composite film and preparation method thereof

Abstract

The invention belongs to the technical field of films, and in particular relates to a photocatalytic inorganic nanoparticle / polydopamine / polymer self-cleaning composite film and a preparation method thereof. According to the preparation method, photocatalytic inorganic nanoparticles are modified to the surface of the composite film by using a chemical binding method, so that the stability of the inorganic nanoparticles on the surface of the composite film is improved, and the contact of the inorganic nanoparticles with pollutants is prompted so as to improve the photo-degradation efficiency of the inorganic nanoparticles, therefore, the self-cleaning capability of the composite film is improved. In addition, as polydopamine is used as a free group quencher, a polymer matrix is effectively prevented from being degraded when being affected by the photocatalytic inorganic nanoparticles in the UV (Ultraviolet) radiation process, so that the property stability of the composite film is improved, and the service life of the composite film is prolonged. The preparation method is simple in operation process, gentle in preparation condition, low in production cost and easy for in-batch and in-scale production, and has a good industrialization production basis and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a photocatalytic inorganic nano particle / polydopamine / polymer self-cleaning composite membrane and a preparation method thereof. Background technique [0002] Pressure-driven membrane technology is the most widely used type of membrane process. Its increasingly wide application in water treatment and other fields has put forward higher and higher requirements for membrane performance such as permeability, selectivity, chemical and thermal stability, especially anti-pollution. However, the fact is that existing pressure-driven membranes cannot avoid the negative impact of membrane fouling on their properties such as permeability and selectivity. Therefore, people have studied and tried a variety of ways to improve the anti-fouling properties of the membrane, such as the optimization of the operating parameters of the instrument and equipment during the use of the pr...

AI Technical Summary

Problems solved by technology

However, it is conceivable that the free radicals generated by these photocatalytic inorganic nanoparticles can not only degrade pollutants, but also degrade the polymer membrane matrix of the pressure-driven membrane, thereby affecting the permeability and selectivity of the membrane. The main thing is that it will eventually greatly reduce the service life of the membrane

The actual use value of the pressure-driven membrane is of course extremely related to its service life. Therefore, it is very unreasonable to sacrifice the service life of the membrane only considering the anti-pollution and self-cleaning properties of the membrane.

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