Reduced graphene oxide-polyurethane dual-sponge adsorption film, preparation method therefor and application of reduced graphene oxide-polyurethane dual-sponge adsorption film

Abstract

The invention discloses a reduced graphene oxide-polyurethane dual-sponge adsorption film, a preparation method therefor and an application of the reduced graphene oxide-polyurethane dual-sponge adsorption film. The reduced graphene oxide-polyurethane dual-sponge adsorption film comprises reduced graphene oxide sponge and a polyurethane hot-pressed sponge film, wherein the reduced graphene oxide sponge is uniformly filled in pores of the polyurethane hot-pressed sponge film and is physically bonded with the polyurethane hot-pressed sponge film. The preparation method comprises the following steps: (1) preparing a graphene oxide-polyurethane sponge dispersion solution; (2) carrying out freeze drying; and (3) carrying out hot-pressing film forming. The reduced graphene oxide-polyurethane dual-sponge adsorption film has the advantages that the adsorption performance is good, the efficiency of removing contaminants from water is high, large-size preparation can be achieved, the adsorption film is easy to recover and can be repeatedly used, and the like; and the preparation method is simple in process and low in cost and advantageously achieves industrial production.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a reduced graphene oxide-polyurethane double-sponge adsorption membrane and its preparation method and application. Background technique [0002] The treatment of pollutants such as dyes, heavy metals, antibiotics, oil and benzene series organics in water has become the focus of widespread attention in society. These pollutants have brought great harm to human production and life, health and the surrounding ecological environment. At present, the methods for effective treatment of these pollutants mainly include adsorption method, reverse osmosis method, flocculation sedimentation method, etc. Among them, adsorption method is currently used as a widely used sewage treatment method, which has the advantages of high adsorption rate and good adsorption effect. . High-performance adsorption materials with high specific surface area and strong adsorption effe...

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Problems solved by technology

However, its mechanical properties are poor, especially it is difficult to maintain the original structure under large-scale conditions, which greatly limits its application range. Another disadvantage is that the sponge-like graphene material is easy to deposit after adsorbing saturated toxic pollutants. In the water body, a large amount of sludge will be accumulated, which is difficult to recycle and easily cause secondary pollution of the water body

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