Preparation method of ZnS/CuS nanosheet composite photocatalyst

Abstract

The invention belongs to the technical field of nano material preparation, and specifically discloses a preparation method of a ZnS / CuS nanosheet composite photocatalyst. The preparation method comprises the following steps: (1) weighing raw materials of copper nitrate trihydrate, zinc nitrate hexahydrate, thiourea and a surfactant according to proportions, then putting the raw materials in an acetonitrile water solution for ultrasonically oscillating, and then stirring under constant temperature, thus forming a uniform copper-zinc mixed solution; (2) putting the copper-zinc mixed solution into a hydrothermal reaction kettle, and reacting under specified temperature and time; (3) completing the reaction, removing supernatant after naturally cooling, respectively washing by three times by using deionized water and absolute ethanol, and drying for 5 hours under 60 DEG C in a drying oven, wherein an obtained product is a composite nanosheet of which Cu to Zn is equal to x to y. In the preparation method of the ZnS / CuS nanosheet composite photocatalyst, disclosed by the invention, when a CuS / ZnS dual-metal sulfide is used as a photocatalyst, photon-generated carriers can be effectively separated, and the photocatalytic activity is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing a ZnS / CuS nanosheet composite material. Background technique [0002] Pollutants in water include inorganic pollutants and organic pollutants. Inorganic pollutants mainly include heavy metal ions such as lead, chromium, mercury, and copper. These heavy metal elements are difficult to degrade, easy to accumulate, irreversible, highly toxic, slow in metabolism, and easy to be bioaccumulated in the environment. Long-term drinking of water polluted by heavy metals can cause acute and chronic poisoning or cause cancer of the body. Organic pollutants mainly include oxygen-consuming non-toxic organic substances (such as protein, fat and carbohydrates, etc.) and toxic organic substances (such as phenolic compounds, organic pesticides and polycyclic aromatic hydrocarbons, dyes and food additives, etc.), these organic pollutants are teratogenic ,...

AI Technical Summary

Problems solved by technology

Commonly used photocatalysts include titanium dioxide (TiO 2 ), zinc oxide (ZnO), tin oxide (SnO 2 ), zirconium dioxide (ZrO 2 ), cadmium sulfide (CdS) and other oxide sulfide semiconductors, among which titanium dioxide has become the most popular nano-photocatalyst material in the world because of its strong oxidizing ability, stable and non-toxic chemical properties, but due to its high band gap energy, it is difficult for Due to the disadvantages of low solar energy utilization rate, it is difficult to achieve photocatalytic degradation under visible light conditions

In the early days, cadmium sulfide (CdS) and zinc oxide (ZnO) were often used as photocatalyst materials, but due to the unstable chemical properties of the two, photodissolution will occur at the same time as photocatalysis, and the dissolution of harmful metal ions has Certain biological toxicity, developed countries have rarely used them as civil photocatalytic materials, so the development of cheap and efficient nano-photocatalysts is an important aspect of current adsorption research

Images