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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

Active Publication Date: 2021-05-25
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of binary composite semiconductor photocatalyst material Ag 2 CrO 4 / BiOI to resolve Ag 2 CrO 4 The photosensitivity and instability lead to problems such as photocorrosion and partial decomposition

Method used

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

Examples

Experimental program
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Embodiment 1

[0038] At room temperature, under magnetic stirring (500-600r / s), 0.30g BiOI and 3.74mg AgNO 3 Disperse in 40mL deionized water, stir vigorously for 30min and then sonicate for 1h. Then K 2 CrO 4 Solution (Ag + : CrO 4 2- =2:1) ​​was added dropwise to the above solution and continued to stir for 2h. The product was collected by filtration and washed 3-5 times with deionized water and absolute ethanol respectively. Dry in vacuum at 80°C for 12h.

[0039] Ag produced 2 CrO 4 The XRD spectrum of the / BiOI binary compound semiconductor photocatalyst material is as follows figure 1 As shown, the diffraction peaks with 2θ of 10.34°, 29.4°, 31.4°, 45.1° and 55.0° correspond to (001), (102), (110), (104), (212) crystal planes and peak shapes of BiOI respectively Sharp and high diffraction intensity, indicating that the synthesized BiOI has high purity and good crystallinity; the diffraction peaks with 2θ of 31.04°, 31.14°, 31.43°, and 32.30° correspond to Ag 2 CrO 4 (220),...

Embodiment 2

[0046] At room temperature, under magnetic stirring (500-600r / s), 0.30g BiOI and 3.67mg CH 3 COOAg was dispersed in 40 mL deionized water, stirred vigorously for 30 min and then sonicated for 1 h. Then K 2 CrO 4 Solution (Ag + : CrO 4 2- =2:1) ​​was added dropwise to the above solution and continued to stir for 2h. The product was collected by filtration and washed 3-5 times with deionized water and absolute ethanol respectively. Dry in vacuum at 80°C for 12h. Preparation of binary composite semiconductor photocatalyst material Ag 2 CrO 4 / BiOI performance is similar to Example 1.

Embodiment 3

[0048] At room temperature, under magnetic stirring (500-600r / s), 0.30g BiOI and 3.67mg CH 3 COOAg was dispersed in 40 mL deionized water, stirred vigorously for 30 min and then sonicated for 1 h. Then K 2 CrO 4 Solution (Ag + : CrO 4 2- =2:1) ​​was added dropwise to the above solution and continued to stir for 2h. The product was collected by filtration and washed 3-5 times with deionized water and absolute ethanol respectively. Dry in vacuum at 80°C for 12h. Preparation of binary composite semiconductor photocatalyst material Ag 2 CrO 4 / BiOI performance is similar to Example 1.

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/132C02F1/30C02F101/30
CPCC02F1/30B01J27/132C02F2101/308B01J35/39
Inventor 宋一兵张琛琛毕晖胡代蓉肖松涛方奕文鲁福身
Owner SHANTOU UNIV
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