Composite photocatalyst and preparation method thereof

Abstract

The invention relates to a photocatalyst, and in particular relates to a carbon nitride / silver carbonate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and photocatalysis in environmental management. The composite photocatalyst is formed by compounding g-C3N4 and Ag2CO3 in the mass ratio of 1:99-10:90. The preparation method comprises the following steps: putting carbon nitride into deionized water for ultrasonically dispersing; adding silver nitrate and ultrasonically dispersing; adding ammonia water and sodium bicarbonate; regulating the pH by using a dilute nitric acid solution; stirring for reacting for a certain period of time; centrifugally separating, washing and drying a product to obtain the g-C3N4 / Ag2CO3 composite photocatalyst. Being proved by photocatalytic performance experiment research, the composite photocatalytic material has high photocatalytic activity. The composite photocatalyst is wide in visible light response range and high in photocatalytic activity, and has good application prospects and economic benefits on the aspects of sewage treatment, solar transformation and the like.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a carbon nitride / silver carbonate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of photocatalysis in composite materials and environmental treatment. Background technique [0002] With the rapid development of the economy, the global energy shortage and environmental degradation are becoming increasingly serious. The application of photocatalytic technology to environmental pollution control has attracted widespread attention from scientists; however, photocatalytic materials have a large band gap and can use light sources The limitation severely restricts the development of photocatalytic technology, so it is of great practical significance to develop new photocatalysts with high-efficiency visible light response. [0003] The energy band gap of silver carbonate is relatively narrow, only 2.30 eV, which is considered as an ideal ...

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Problems solved by technology

[0002] With the rapid development of the economy, the global energy shortage and environmental degradation are becoming increasingly serious. The application of photocatalytic technology to environmental pollution control has attracted widespread attention from scientists; however, photocatalytic materials have a large band gap and can use light sources The limitation severely restricts the development of photocatalytic technology, so it is of great practical significance to develop new photocatalysts with high-efficiency visible light response.

[0003] The energy band gap of silver carbonate is relatively narrow, only 2.30 eV, which is considered as an ideal visible light catalyst, but the pure silver carbonate particles are large and its surface area is small, resulting in poor adsorption performance, and the photogenerated electrons and holes cannot be effectively separated. , limiting its photocatalytic activity; so far, people mainly improve its photocatalytic activity by doping metal or metal oxide (A New Approach for Photocorrosion Inhibition of Ag 2 CO 3 Photocatalyst with Highly Visible-Responsive Reactivity, J. Phys. Chem. C, 2012, 116: 15519-15524)

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