Preparation method of photocatalytic film for dye degradation

Abstract

The invention discloses a preparation method of a photocatalytic film for dye degradation. The preparation method is realized by the following steps: (1) preparing a nano composite material of nitrogen-doped graphene oxide and titanium dioxide; (2) compounding activated carbon with the nano particles prepared in the step (1) to obtain activated carbon-supported nitrogen-doped graphene oxide-titanium dioxide nano particles (AC@NGRT); and (3) coating a polysulfone flim with a layer of an adhesive, settling the nano particles obtained in the step (2) on the polysulfone film to prepare the photocatalytic film for dye degradation. The method has the advantages that the photocatalytic film which can be used for dye degradation is developed through the combination of the photodegradation performance of nanoparticles and the chemical stability of a polymer film. The method can be used to solve the problems that a nano-catalyst is difficult to recover and is lost easily, and the anti-pollutionperformance of the polymer film is further improved. The prepared photocatalytic film has high dye degradation efficiency and is environmentally friendly, and is suitable for industrial production andapplication.

Description

Technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for preparing a photocatalytic film for dye degradation. Background technique [0002] Dye wastewater is one of the most difficult-to-degrade industrial wastewaters. With the vigorous development of the dye industry, the harm to the environment such as water bodies is becoming more and more serious, and it has received extensive attention from all over the world. It is estimated that about 10% to 15% of the dyes are lost with wastewater during the use of dyes. Taking 2010 as an example, my country’s dye production reached 756,000 tons. According to this calculation, my country’s annual discharge of dyes with wastewater is as high as 756-151,200 tons. As the main pollutants of dye wastewater, most of dyes and dye intermediates are biologically toxic and difficult to degrade, which leads to their long-term retention in the environment. With the development of...

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Problems solved by technology

Biological method is to use microorganisms to oxidize and reduce dye molecules and destroy their chromophoric groups, so as to achieve the purpose of decolorization and degradation, but the requirements for microorganisms are relatively high; chemical methods, commonly used chemical methods are based on advanced oxidation technology, such as Photocatalytic oxidation method, ozone oxidation method, electrochemical method and semiconductor photocatalytic method, etc. Advanced oxidation method has high degradation performance on dyes, but the catalyst is difficult to recycle and easily lost, and may cause secondary pollution to the environment; Physical method, the commonly used physical methods mainly include adsorption method, membrane separation method, etc. The adsorption method is to use porous solid materials (activated carbon, cinnamon clay, cinnamon earth, etc.) to adsorb dyes in wastewater to achieve the purpose of purifying water bodies. Membrane separation The method can effectively intercept the dye molecules, but the macromolecular organic matter will block the membrane pores, affect the service life of the membrane, and increase the operating cost; the membrane separation technology is a new separation technology that emerged rapidly after the 1960s. It has the advantages of high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control, etc. Combining membrane separation technology with advanced oxidation method can not only solve the problem of difficult catalyst recovery, but also improve the anti-pollution performance of the membrane and the protection of dyes. Degradability

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