A binary compound semiconductor photocatalyst material ag 2 cro 4 /bioi and its preparation and application

A photocatalyst, binary composite technology, applied in physical/chemical process catalyst, chemical/physical process, light water/sewage treatment, etc., can solve the problems of unstable photosensitivity, corrosion, etc., achieve convenient synthesis route, improve stability high photocatalytic activity
CN108940325BActive Publication Date: 2021-05-25SHANTOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANTOU UNIV
Publication Date
2021-05-25

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Abstract

The invention relates to a binary composite semiconductor photocatalyst material Ag 2 CrO 4 / BiOI and its preparation and application, Ag 2 CrO 4 The mass ratio to BiOI is 2‑30:100; BiOI is a bismuth oxyiodide microsphere formed by self-assembly of two-dimensional (2D) nanosheets, and the Ag 2 CrO 4 Deposited on the surface of BiOI nanosheets and in the gaps between the sheets. The preparation method is as follows: (1) under the condition of 26-28°C, uniformly disperse the BiOI and silver source prepared by the solvothermal method in deionized water; add the aqueous solution containing chromate under vigorous stirring, and continue stirring for 30-150min; ( 2) The solid product is obtained by filtration, and the product is fully washed and dried in vacuum at 50-90° C. for 8-24 hours. The molar ratio of silver source and chromate is 2:1. As a photocatalyst for the degradation of organic dyes. Ag of the present invention 2 CrO 4 / BiOI was shown to interact with Ag in the visible light degradation of Rhodamine B 2 CrO 4 similar high activity, while its catalytic stability is higher than that of Ag 2 CrO 4 It has been significantly improved and can be used repeatedly. Moreover, the synthesis route of the preparation method of the present invention is convenient, simple and efficient, and environmentally friendly.
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Description

technical field

[0001] The invention relates to the preparation of photocatalytic materials, in particular to a binary composite semiconductor photocatalyst material Ag 2 CrO 4 / BiOI and its preparation and application. Background technique

[0002] In recent years, silver-based semiconductors have been widely used in the degradation of organic pollutants, water splitting and CO due to their excellent visible light photocatalytic properties. 2 reduction reaction. Among them, Ag 2 CrO 4 It is an n-type semiconductor with a band gap of 1.8eV, has a good response to visible light, and exhibits excellent catalytic activity in photocatalytic reactions. However, silver-based semiconductor photocatalysts have poor chemical stability and are prone to photochemical corrosion, which limits their application in photocatalytic reactions. Therefore, increasing the Ag 2 CrO 4 Photostability is a research hotspot.

[0003] BiOI is an indirect bandgap semiconductor, which has a uni...

Claims

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