Preparation method of a self-assembled silver phosphate-based composite visible light catalytic material

Abstract

The invention relates to a photocatalytic material and in particular relates to a preparation method of a self-assembly silver phosphate based composite visible light catalytic material. The preparation method comprises the following steps: dissolving graphene oxide in water, performing ultrasonic treatment and obtaining a graphene oxide dispersion liquid; dripping a silver nitrate solution in the graphene oxide dispersion liquid under a stirring condition, stirring for a period of time and obtaining a mixed precursor solution A; slowly dripping a prepared titanium dioxide solution into the mixed precursor solution A and obtaining a mixed solution B; slowly dripping a prepared phosphate solution into the mixed solution B, continuously stirring for a period of time after celadon turbidity is generated in a reaction system, then centrifugally separating, washing and drying a product obtained by reaction, and obtaining the visible light catalytic material. The preparation method of the self-assembly silver phosphate based composite visible light catalytic material has the advantages that the preparation process is simple, the prepared material is regular in shape and structure and uniform in size, and is also capable of having strong degradation activity on an organic dye rhodamine B under the action of visible light irradiation.

Description

technical field [0001] The invention relates to photocatalytic materials, in particular to a method for preparing a self-assembled silver phosphate-based composite visible light catalytic material, in particular to a method for preparing a self-assembled silver phosphate-based composite visible light catalytic material by an ion exchange method in an aqueous solution, which belongs to the composite materials, photocatalytic technology and water pollution control. Background technique [0002] Titanium dioxide has gained widespread attention due to its strong oxidizing properties, high chemical stability, non-toxicity and low cost. However, titanium dioxide has a narrow light absorption range (only limited to the ultraviolet region) and low quantum efficiency, especially Its low degree of visible light response results in limited photocatalytic activity under visible light irradiation. Studies have shown that the photocatalytic activity of titanium dioxide depends largely on...

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Problems solved by technology

[0002] Titanium dioxide has gained widespread attention due to its strong oxidizing properties, high chemical stability, non-toxicity and low cost. However, titanium dioxide has a narrow light absorption range (only limited to the ultraviolet region) and low quantum efficiency, especially Its low degree of visible light response results in limited photocatalytic activity under visible light irradiation. Studies have shown that the photocatalytic activity of titanium dioxide depends largely on its shape and size, especially its exposed crystal facets. Therefore, the preparation of high proportion The {001} surface TiO nanosheets with controllable morphology are one of the effective ways to improve the photocatalytic performance of TiO

[0004] The surface of graphene oxide has more hydrophilic functional groups. When graphene oxide is applied to the preparation of composite materials, the negative charge on its surface can not only provide more reaction sites for positively charged silver ions, so that it can Control the nucleation and growth of silver phosphate on the surface of graphene oxide, so as to effectively control the size and shape of silver phosphate; on the other hand, due to the good solubility and dispersion of graphene, its effective compounding with silver phosphate can significantly Improve the dispersion and solubility properties of composite materials. With the improvement of the preparation process of graphene oxide and the reduction of cost, the use of graphene oxide in the composite system can also greatly reduce the cost; currently, titanium dioxide nanosheets, graphene oxide, silver nitrate With phosphate as raw material, using the ion exchange method in aqueous solution to synthesize a self-assembled silver phosphate-based composite visible photocatalytic material with regular shape and uniform size and used for photocatalytic degradation of organic pollutants and purification of water resources has not been reported.

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