Technical field

The invention belongs to the field of nanocomposite material preparation, in particular relates to a preparation method of graphene (GE)/γFe2O3 composite photocatalyst modified by CdS nanoparticles.

Technical background

Semiconductor photocatalysis is a hot research direction in the intersection of materials chemistry and environmental chemistry. Photocatalysis technology can degrade most organic pollutants at normal temperature and pressure without secondary pollution, and has become a promising method for environmental pollution control. The core of photocatalytic technology is photocatalytic materials, and traditional photocatalytic materials for metal oxides or sulfide semiconductor compounds, which are limited by their own properties; photocatalytic performance is generally low.

In recent years, the coupling of two or more kinds of semiconductors to form semiconductor heterostructures has received extensive attention from researchers. It has become a developing trend to construct all-solid-state Z-type band structure composites according to the different positions of semiconductor conduction and valence bands. All-solid Z-type band structure uses electrons on semiconductor A guide band to combine with holes in semiconductor B valence band through electronic intermediation, leaving holes on semiconductor A and electrons on semiconductor B, and the remaining electrons and holes have strong reduction and oxidation capabilities. In addition, this structure can promote the effective separation of photogenerated electron-hole pairs. The catalytic performance of semiconductor is greatly improved.

Graphene (GE) is a new two-dimensional carbon material that has developed most rapidly in recent years. In addition to many advantages of traditional carbon materials such as large specific surface area, high chemical stability, and good adsorption capacity, it also has special properties such as perfect quantum Hall effect, unique quantum tunneling effect, and bipolar electric field effect due to its unique structure. The invention selects γ-Fe2O3 and CdS with matching band gap as semiconductor A and B respectively, and uses graphene as electronic intermediary to construct γ-Fe2O3/GE/CdS composite photocatalyst, and prepares a Z-type structure composite photocatalytic material with excellent performance, which can be used for visible light degradation of organic pollutants.

Content of invention

First, cubic Prussian blue (PB) nanoparticles were synthesized by hydrothermal method. Then the PB particles were ultrasonically dispersed in deionized water, and polyacrylamide hydrochloride was added to make the PB particles positively charged. Add uniform graphite oxide dispersion and cadmium nitrate solution successively and stir. Finally, the sodium sulfide solution is added, stir, and the product is collected. The product was heated to 350℃ at the rate of 2℃min1 in an argon atmosphere and kept for 2 hours to obtain the final product. The composite is a good visible light catalyst and has photocatalytic degradation effect on Rhodamine B.