Bifunctional porous material efficient in adsorptively degrading lignin and preparation method thereof

Abstract

A bifunctional porous material efficient in adsorptively degrading lignin and a preparation method thereof are characterized in that the bifunctional porous material is made by compounding bismuth ferrite and carbon nitride nanosheets, the bismuth ferrite is of highly-ordered mesoporous structure, and a mol ratio of the mesoporous bismuth ferrite meso-BiFeO3 to the carbon nitride nanosheets g-C3N4 NS is (1-11):1; a composite catalyst uses the mesoporous nano bismuth ferrite as a main catalyst and ultrathin carbon nitride nanosheet carrier as a surface adsorbing modifying layer is provided, affinity between carbon nitride and a substrate is enhanced through Pi-Pi action and hydrophobic action between the carbon nitride and the substrate, adsorption is significantly enhanced for lignin, and interfacial reacting capacity is improved; semiconductor coupling action between the bismuth ferrite and carbon nitride promotes the separation and migration of photo-induced carriers in a heterophase interface, and visible light catalytic activity of the composite catalyst is improved; finally, in a reaction system of visible light and H2O2, highly oxidative materials such as hydroxyl radicals produced by catalysis of the catalyst attack lignin molecules and causes structural loop opening to the molecules, and efficient degradation is implemented; the material and the preparation method thereof are of important scientific significance and environmental benefit.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to the use of a composite of mesoporous bismuth ferrite and carbon nitride nanosheets as an adsorption and catalyst during the treatment of lignin-containing papermaking wastewater, using the strong strength of the composite porous material Adsorption and catalytic performance of lignin, adsorption and catalytic oxidative degradation of lignin, and finally achieve the purpose of lignin removal, to achieve advanced treatment of lignin-containing wastewater. Background technique [0002] my country is a country that lacks water resources, and the pollution of water resources is relatively serious, which makes water resources face a more severe situation. Among industrial enterprises, the paper industry is a large sewage discharger, which has a great impact on the water environment. Therefore, it is an urgent task to carry out advanced treatment of the wastewater discharged by t...

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Problems solved by technology

Similarly, the treatment object is also wastewater containing small molecule dyes, if it is used to treat large molecular weight lignin, it will be difficult to succeed

The reasons are as follows: First, it is difficult for the catalyst to selectively adsorb lignin. The specific surface area of ​​bismuth ferrite and carbon nanotubes is relatively low, and the adsorption capacity is relatively limited. The lack of adsorption capacity will inevitably have a negative impact on subsequent degradation.

The second is that the catalytic activity of the catalyst needs to be improved, especially for large molecules such as lignin that are difficult to degrade, and its ability is still insufficient.

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