Novel ZnO/Cu2O heterojunction photocatalytic material and preparation method thereof

Abstract

The invention discloses a novel ZnO / Cu2O heterojunction photocatalytic material and a preparation method thereof. According to the material, soluble copper salt is dissolved in 50 mL of deionized water, hierarchical ZnO micro-nano flowers are dispersed into the solution uniformly under magnetic stirring condition, then proper amount of sodium hydroxide and citric acid are added in sequence, the materials react in a water bath at 50 DEG C for 30 min, and a hierarchical ZnO micro-nano flower structure modified with rod-shaped Cu2O nanoparticles is obtained. The preparation technology of the novel ZnO / Cu2O heterojunction photocatalytic material is simple and convenient, expensive equipment is not involved, the product is novel in morphology and larger in specific surface area, response of ZnO in the visible light range is extended, furthermore, a built-in electric field produced in a heterojunction at a compound interface of the product can promote effective separation of photo-induced electron-holes remarkably and inhibit recombination of the photo-induced electron-holes, so that the photo-quantum efficiency is increased obviously, and excellent photocatalytic performance and cycle stability are shown.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic material preparation, in particular to a ZnO / Cu 2 O heterojunction novel photocatalytic material and its preparation method. Background technique [0002] In 1977, Bard et al. used semiconductor TiO 2 CN in wastewater as a photocatalyst - Oxidation to OCN - , creating a precedent for photocatalyst treatment of wastewater. Since then, the research work on inorganic semiconductor nanomaterials as photocatalysts to degrade organic pollutants has been fully launched. In recent years, due to the progress of global industrialization, environmental problems have become increasingly serious, and environmental protection and sustainable development have become the primary issues people consider. Semiconductor photocatalytic materials have also attracted great attention. Nano-zinc oxide (ZnO), as an important wide-bandgap semiconductor functional material (3.2ev), has broad applicat...

AI Technical Summary

Problems solved by technology

At present, although there have been related reports to prepare ZnO / Cu 2 O composite photocatalytic materials, such as hydrothermal method and electrodeposition method, etc., but the preparation route is often complicated, involving expensive equipment, or the obtained material has a single morphology, is easy to agglomerate, and has low photocatalytic efficiency.

Therefore, a simple and convenient route is adopted to obtain ZnO / Cu with novel morphology and excellent photocatalytic activity and stability. 2 O heterojunction photocatalytic materials still have great challenges

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