A method for preparing quaternary sulfide quantum dot-based heterojunction high-efficiency photocatalysts

Abstract

The invention relates to group I-III-VI2 sulfides, and specifically refers to the preparation of AgIn5S8-ZnS / MoS2 heterojunction composite photocatalyst by a simple and rapid hydrothermal method, which can be used to degrade rhodamine B dye under visible light. AgIn5S8‑ZnS nanocrystals were mixed and stirred with ammonium molybdate tetrahydrate and thiourea for a hydrothermal reaction at 200 degrees for 8 hours. After the reaction was completed, they were filtered, washed and dried to obtain the AgIn5S8‑ZnS / MoS2 heterojunction composite photocatalyst, in which The mass ratios of MoS2 and AgIn5S8-ZnS nanocrystals are 1%-30% respectively, and the optimal mass ratio for photocatalytic performance is 5%. The experiment of degrading rhodamine B (RhB) under visible light proved that the prepared composite photocatalyst has good photocatalytic activity.

Description

technical field [0001] The present invention relates to Ⅰ-Ⅲ-Ⅵ 2 group of sulfides, especially the preparation of AgIn by simple and rapid hydrothermal method 5 S 8 -ZnS / MoS 2 A heterojunction composite photocatalyst that can be used to degrade Rhodamine B dye under visible light. Background technique [0002] AgIn 5 S 8 -ZnS nanocrystals are Ⅰ-Ⅲ-Ⅵ 2 The direct bandgap ternary sulfide semiconductor, with nanometer size and visible light response, not only possesses the excellent performance of quantum dots, but also is expected to replace Cd-based quantum dots in various fields due to its advantages of low toxicity and environmental protection; its strong The quantum confinement effect makes it have size-tunable optical properties, and the large specific surface area provides more active sites. The nanostructure can reduce the distance for carriers to diffuse to the surface of the catalyst, and effectively improve the migration rate of photogenerated carriers. , which ...

AI Technical Summary

Problems solved by technology

[0002] AgIn 5 S 8 -ZnS nanocrystals are Ⅰ-Ⅲ-Ⅵ 2 The direct bandgap ternary sulfide semiconductor, with nanometer size and visible light response, not only possesses the excellent performance of quantum dots, but also is expected to replace Cd-based quantum dots in various fields due to its advantages of low toxicity and environmental protection; its strong The quantum confinement effect makes it have size-tunable optical properties, and the large specific surface area provides more active sites. The nanostructure can reduce the distance for carriers to diffuse to the surface of the catalyst, and effectively improve the migration rate of photogenerated carriers. , which is more conducive to the realization of efficient photocatalytic decomposition of organic matter; currently, Wenjuan Zhang et al. (Journal of Solid State Chemistry 183 (2010) 2466–2474.) have studied the preparation of AgIn by microwave method 5 S 8 Powder and verify the effect of degrading methyl orange under visible light, the size of the material is above the micron level, the specific surface area is low, and the photocatalytic degradation efficiency is low

Jiangluqi Song et al. (Inorg.Chem.2015,54,1627-1633.) studied the synthesis of Zn-doped AgIn by hydrothermal method 5 S 8 Changes in the optical properties of quantum dots at different times and temperatures, different concentrations of L-cysteine ​​and zinc acetate content, and finally prepared AgIn 5 S 8 / ZnS core-shell structure and research on biological applications; JianhuaHan et al. (ACS Appl. Mater. Interfaces 2014, 6, 17119-17125.) successfully prepared AgInS 2 Application of modified ZnO nanorods to construct composite systems in all-solid-state hybrid solar cells; Kan Li et al. (ACS Catal.2013,3,170-177.) studied AgIn 5 S 8 / TiO 2 Heterojunction nanocomposite with strong visible-light-responsive photocatalytic activity, however, constructing AgIn grown from an optimized interfacial structure 5 S 8 -ZnS / MoS 2 The application of heterojunction composite photocatalysts has not

Images