Heterojunction type ternary composite semiconductor photocatalyst and preparation method thereof

Abstract

The invention discloses a heterojunction type ternary composite semiconductor photocatalyst and a preparation method thereof. A constant-pH coprecipitation method is adopted to prepare ternary layered double hydroxides as a precursor, and finally a ternary heterojunction composite semiconductor is obtained by high-temperature roasting. The preparation technology is simple and convenient, the obtained material is provided with a proper energy band structure, current carrier separation and migration rates can be effectively improved, visible light is efficiently used, the relative amount of metal ions is selectively regulated and controlled to prepare a series of ternary heterojunction composite semiconductors, a high-activity photocatalyst is screened out, and good dye degradation ability is shown under the visible light. A visible light catalytic degradation reaction rate constant of the ternary heterojunction composite semiconductor to methylene blue is 1.6 to 4.1 times of that of a binary composite semiconductor, and the ternary heterojunction composite semiconductor has higher catalytic activity and good universality in the aspect of dye degradation under visible light.

Description

Technical field

[0001] The invention belongs to the technical field of semiconductor photocatalyst preparation, and in particular relates to a zinc oxide-based heterojunction ternary composite oxide semiconductor photocatalytic material and a preparation method thereof, and is applied to a visible light catalytic degradation reaction of organic dyes. Background technique

[0002] Photocatalytic technology has received extensive attention in the field of solar energy conversion and environmental purification. Expanding the spectral response range and improving the photocatalytic quantum efficiency of catalysts are hot topics in the field of photocatalytic chemistry. As we all know, TiO 2 ZnO and ZnO are the most commonly used semiconductor photocatalysts. However, these two wide band gap semiconductors have disadvantages such as low quantum efficiency and ineffective use of visible light, which limit their application in the field of environmental pollution control. Therefore, des...

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