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Preparation method for single crystal selenium nanorod visible light catalytic material and use thereof

A photocatalytic material, selenium nanotechnology, applied in the field of nanomaterials, can solve the problems of low utilization rate and achieve the effect of uniform shape, high photocatalytic rate and good repeatability

Inactive Publication Date: 2015-04-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since ultraviolet light in sunlight only accounts for about 4% and the utilization rate is low, it is urgent to propose semiconductors that respond to visible light

Method used

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  • Preparation method for single crystal selenium nanorod visible light catalytic material and use thereof
  • Preparation method for single crystal selenium nanorod visible light catalytic material and use thereof
  • Preparation method for single crystal selenium nanorod visible light catalytic material and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method of the single crystal selenium nanorod visible light photocatalytic material t-Se NRs prepared in this example is as follows: (1) Preparation of amorphous α-Se

[0026] Weigh 0.111g SeO 2 , 0.352g of ascorbic acid were dissolved in 10mL of deionized water, after the dissolution was complete, the ascorbic acid solution was slowly added dropwise to the selenous acid solution. sex. Finally, the solid phase product obtained by centrifugation is α-Se.

[0027] (2) Preparation of single crystal gray selenium t-Se NRs

[0028] The prepared α-Se was then transferred to a beaker filled with ethanol, left to age for 24 hours, washed and dried to obtain a gray product, which was t-Se NRs.

[0029] The phase of the product prepared in this embodiment is tested by X-ray diffraction spectrum (XRD), using Rigaku D / Max-RB instrument Product characterization analysis. The ultraviolet-visible diffuse reflectance spectrum (DRS) was tested with a Lambda 35UV / Vis spectromet...

Embodiment 2

[0037] The method of the single crystal selenium nanorod visible light photocatalytic material t-Se NRs prepared in this example is as follows: (1) Preparation of amorphous α-Se

[0038] Weigh 0.111g SeO 2 , 0.352g of ascorbic acid were dissolved in 8mL of deionized water, after the dissolution was complete, the ascorbic acid solution was slowly added dropwise to the selenous acid solution. sex. Finally, the solid phase product obtained by centrifugation is α-Se.

[0039] (2) Preparation of single crystal gray selenium t-Se NRs

[0040] Then transfer the prepared α-Se to a container with a concentration of 1×10 -5 mol / L NaOH ethanol solution, after static aging for 20 h, the gray product was obtained after washing and drying, which were t-Se NRs. The SEM images of the prepared t-Se NRs are shown in Figure 4 As shown in (2), it is rod-shaped, with a diameter of 200nm and a length of 10-20um.

Embodiment 3

[0042] The method of the single crystal selenium nanorod visible light photocatalytic material t-Se NRs prepared in this example is as follows: (1) Preparation of amorphous α-Se

[0043] Weigh 0.111g SeO 2, 0.352g of ascorbic acid were dissolved in 10mL of deionized water, after the dissolution was complete, the ascorbic acid solution was slowly added dropwise to the selenous acid solution. sex. Finally, the solid phase product obtained by centrifugation is α-Se.

[0044] (2) Preparation of single crystal gray selenium t-Se NRs

[0045] Then transfer the prepared α-Se to a container with a concentration of 1×10 -4 mol / L NaOH ethanol solution, after static aging for 22h, the gray product was obtained after washing and drying, which were t-Se NRs. The SEM images of the prepared t-Se NRs are shown in Figure 4 As shown in (3), it is rod-shaped, with a diameter of 300-400nm and a length of about 5um.

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Abstract

The invention provides a preparation method for single crystal selenium nanorod visible light catalytic materials. The preparation method comprises the following steps that selenium dioxide and ascorbic acid are weighed, and the selenium dioxide is dissolved in deionized water to prepare a selenous acid solution; the selenous acid solution is dropped into an ascorbic acid solution, after the dropping is completed, red suspension liquid is prepared; the suspension liquid is stirred, precipitate is centrifuged and washed to be neutral, and at last a solid phase product alpha-Se is obtained after centrifugation; the prepared alpha-Se is transferred to a beaker containing a NaOH ethanol solution, after still standing and aging are performed, gray products are obtained after the mixture is washed and dried, and the gray products are the single crystal selenium nanorod visible light catalytic materials. According to the preparation method, the diameters of the prepared single crystal selenium nanorods are ranging from 100nm to 200nm, the length is tens of microns, the band gap of semiconductors of the nanorods measured by a diffuse reflection spectrum is 1.76eV, the single crystal selenium nanorods are used for degrading dye in an industry dye pollutant, and the degradation effect on methyl orange is particularly obvious.

Description

technical field [0001] The invention provides a single crystal selenium nanorod visible light photocatalytic material and a preparation method thereof, which belong to the technical field of nanometer materials and are used for degrading dyes in industrial dye pollutants, especially methyl orange. Background technique [0002] Since visible light-responsive photocatalysts are used in solar energy conversion, it is imminent to search for visible-light-responsive photocatalysts. At present, compared with compound photocatalysts, such as oxides, salts, etc., people began to explore a new type of visible light-responsive photocatalysts and turned their attention to single substance photocatalysts (G. Liu, ChemPhysChem 2013 14(5), 885– 892), such as monocrystalline Si (Z.H.Kang, Adv.Mater.2009,21,661–664.), α-S (G.Liu, J.Am.Chem.Soc.2012,134,9070–9073.), Red phosphorus P (F. Wang, Appl. Catal. B 2012, 111–112) and elemental selenium Se (Y.D. Chiou, Appl. Catal. B 2011, 105, 211–...

Claims

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Application Information

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IPC IPC(8): B01J27/057C01B19/02B82Y30/00B82Y40/00C02F1/30A62D3/17A62D101/26
Inventor 张若芳杨超周朝昕田熙科罗东岳王龙艳
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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