Preparation method of zinc copper sulfide flower-like micro-sphere super-structure visible-light-driven photocatalyst composed of nanosheets

Abstract

The invention provides a preparation method of a zinc copper sulfide flower-like micro-sphere super-structure visible-light-driven photocatalyst composed of nanosheets. The method comprises the following steps: respectively adding a zinc salt and a copper salt into o-hydroxyl diol, stirring and dissolving, adding thiourea, and continuously stirring until the thiourea is completely dissolved; adding polyvinylpyrrolidone (PVP), and performing stirring reflux at a temperature of 120-160 DEG C for 1-3 hours; naturally cooling to a room temperature, and performing centrifugal separation; washing and drying the obtained precipitate, thereby obtaining the flower-like micro-sphere super-structure visible-light-driven photocatalyst ZnxCu1-xS composed of nanosheets (x is more than or equal to 0.05 and less than or equal to 0.3). The product prepared by the method disclosed by the invention is large in specific surface area, high in photocorrosion resistance and high in visible-light photocatalytic activity, and environmental pollutants can be subjected to photocatalytic degradation by fully utilizing sunlight. The method has the advantages of being simple in production process, safe in production process, easily controllable in reaction parameters and capable of easily realizing large-scale industrialized production.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a Zn nanometer sheet composed of nanosheets prepared by a reflux method. x Cu 1-x S(0.05≤x≤0.3) (copper zinc sulfide) flower-shaped microsphere superstructure visible light catalyst method. Background technique [0002] With the development of social economy, the problem of environmental pollution is becoming more and more serious. The governance and control of environmental pollution is a major issue that human beings face and need to solve urgently in the 21st century. Semiconductor heterogeneous photocatalysis has been favored by people because of its strong oxidative properties, complete mineralization of pollutants, and direct use of sunlight in the removal of various environmental refractory pollutants. At present, in the semiconductor catalysts used in heterogeneous photocatalytic reactions, the energy band gap of semiconductors that are sensitive to s...

AI Technical Summary

Problems solved by technology

At present, in the semiconductor catalysts used in heterogeneous photocatalytic reactions, the energy band gap of semiconductors that are sensitive to sunlight and have photocatalytic properties is generally 1.9-3.1eV. If the band gap is too wide, it can only absorb ultraviolet rays in sunlight. Light, and ultraviolet light in sunlight only accounts for 3% to 4% of the total energy of sunlight, so the utilization rate of solar energy is low, such as TiO 2 (3.2eV), ZnO(3.4eV), ZnS(3.6eV) and other photocatalysts; on the contrary, if the band gap is too narrow, the ability to oxidize and degrade pollutants is weak, such as Bi 2 S 3 (1.2~1.7eV), Sb 2 S 3 (1.5~2.2eV), CuS(1.8~2.0eV), CuO(1.7eV), etc.

In addition, metal sulfide semiconductor photocatalysts such as ZnS, CuS, and CdS are unstable in the photocatalytic process and are prone to photocorrosion, which also limits their practical applications. However, their stability can be improved if they are prepared as multi-component metal sulfides. , making it less susceptible to photocorrosion

Images