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Dual-composite semiconductor photocatalyst material Ag2Cr2O4/BiOI and preparation and applications thereof

A photocatalyst, binary composite technology, applied in physical/chemical process catalyst, chemical/physical process, light water/sewage treatment, etc., can solve the problems of corrosion, unstable photosensitivity, etc. Convenient and improve the effect of photocorrosion phenomenon

Active Publication Date: 2018-12-07
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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  • Dual-composite semiconductor photocatalyst material Ag2Cr2O4/BiOI and preparation and applications thereof
  • Dual-composite semiconductor photocatalyst material Ag2Cr2O4/BiOI and preparation and applications thereof
  • Dual-composite semiconductor photocatalyst material Ag2Cr2O4/BiOI and preparation and applications thereof

Examples

Experimental program
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Effect test

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 dual-composite semiconductor photocatalyst material Ag2Cr2O4 / BiOI and preparation and applications thereof. The mass ratio of Ag2Cr2O4 to BiOI is (2-30):100; BiOI is iodinebismuth oxide microspheres formed by self-assembling two-dimensional (2D) nanosheets, and Ag2Cr2O4 is deposited into the surfaces of BiOI nanosheets and among clearances of the sheets. The preparationcomprises the following steps: (1) under the condition of 26-28DEG C, evenly dispersing BiOI, prepared by using a solvothermal method, and a silver source into deionized water; adding a chromate-containing aqueous solution while intensely stirring, and continuing stirring for 30-150min; and (2) filtering to obtain a solid product, fully washing the product, and performing vacuum drying for 8-24hat 50-90DEG C. The molar ratio of the silver source and chromate is 2:1. The photocatalyst material can serve as a photocatalyst for degrading organic dye. During reaction of visible light degrading rhodamine B, the Ag2Cr2O4 / BiOI shows high activity similar to that of the Ag2Cr2O4, the catalytic stability is remarkably improved compared with Ag2Cr2O4, and the dual-composite semiconductor photocatalyst material Ag2Cr2O4 / BiOI can be recycled for many times. The synthesis route of the preparation method is convenient and fast, simple and high-efficiency, and green and environment-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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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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