Treatment method capable of synchronously improving adsorption performance and visible light absorption rate of graphite-like carbon nitride

Abstract

The invention discloses a treatment method capable of synchronously improving adsorption performance and visible light absorption rate of graphite-like carbon nitride. The treatment method comprises the following steps: dipping attapulgite subjected to radiation modification into a Fe salt solution, taking the radiation modified attapulgite subjected to Fe<3+> ion replacement and urea as a co-precursor, and performing high-temperature calcinations to obtain the radiation modified attapulgite limited range doped graphite-like carbon nitride with efficient adsorption performance and visible light adsorption rate. The treatment method is low in preparation cost, simple in process and favorable for industrial large-scale production, and can be applied in the fields of degradation of visible light of organic pollutants in water, soil or air, air purifier filter screens, decorative coating and the like.

Description

technical field [0001] The invention belongs to the technical field of modification of graphite-like carbon nitride, and in particular relates to a treatment method for improving the adsorption and visible light absorption performance of graphite-like carbon nitride. Background technique [0002] Graphite-like carbon nitride, called CN in English, is a non-metallic semiconductor with a layered structure similar to graphite and has a certain range of response to visible light. As a visible light catalyst, graphite-like carbon nitride can be widely used in organic pollution Photocatalytic degradation in the fields of materials, fuel cells, etc., the entire reaction process will not cause secondary pollution, while overcoming the shortcomings of traditional visible light catalysts, such as semiconductor oxides (ZnO, MnO 2 、TiO 2 etc.) are difficult to modify, high cost, poor acid and alkali resistance, and low light absorption rate. [0003] At present, graphite-like carbon n...

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Problems solved by technology

[0002] Graphite-like carbon nitride, called CN in English, is a non-metallic semiconductor with a layered structure similar to graphite and has a certain range of response to visible light. As a visible light catalyst, graphite-like carbon nitride can be widely used in organic pollution Photocatalytic degradation in the fields of materials, fuel cells, etc., the entire reaction process will not cause secondary pollution, while overcoming the shortcomings of traditional visible light catalysts, such as semiconductor oxides (ZnO, MnO 2 、TiO 2 etc.) Difficult to modify, high cost, poor acid and alkali resistance, and low light absorption

[0003] At present, graphite-like carbon nitride can be synthesized by polycondensation method using precursors such as melamine, urea, and dicyandiamide, but the specific surface area of ​​the synthesized graphite-like carbon nitride is low, which seriously limits its adsorption of pollutants. Performance, the enrichment ability of pollutants becomes worse, which will lead to a decrease in the rate control ability of subsequent photocatalytic reactions; in addition, the visible light absorption range of graphitic carbon nitride is narrow, only about 460 nm, which greatly limits its visible light absorption range. Application of Catalytic Performance

[0004] Therefore, in order to further broaden the range of visible light absorption, technicians have carried out a series of modification studies on CN, such as metal ion doping / co-doping, noble metal modification, heterojunction recombination, etc.; by promoting the separation of photogenerated carriers, the CN However, the widening of the visible light response range cannot increase the specific surface area of ​​CN, resulting in poor adsorption capacity of enriched pollutants and harmful intermediate products, and has not fundamentally improved the photocatalytic degradation of pollutants by CN. ability

In order to solve this problem, the current technical means mainly use substrates or chemical reagents that increase the specific surface area and visible light absorption rate. This method not only increases the cost and steps of material preparation, but also brings unpredictable secondary pollution to the environment. Based on this, it is a key technical problem to be solved urgently in this technical field to study a simple, low-cost and green technical means to simultaneously improve the adsorption performance and visible light absorption rate of graphite-like carbon nitride.

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