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A kind of hydrothermal method prepares the method for tin disulfide/bismuth oxyiodide composite photocatalyst

A technology of tin disulfide and bismuth oxyiodide, which is applied in the fields of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as complicated experimental process, unsuitable for quantitative production, and high application cost, and achieve The effect of increasing the specific surface area, increasing the contact active sites, and improving the photocatalytic performance

Active Publication Date: 2020-04-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the three-step method avoids the generation of impurity phases, the experimental process is too complicated, the application cost is high, and the time is long, so it is not suitable for quantitative production

Method used

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  • A kind of hydrothermal method prepares the method for tin disulfide/bismuth oxyiodide composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Add 4mmol of Bi(NO 3 ) 3 ·5H 2 O, dissolved in 40ml deionized water, according to the molar ratio of elements n Bi :n I =1:1 Weigh quantitative KI, slowly add to the above solution, keep stirring for 60min, adjust the pH so that pH=7.

[0036] 2) Transfer the mixed solution to a homogeneous hydrothermal kettle, put it into a homogeneous reactor, control the filling ratio at 40%, control the reaction temperature at 110°C, and react for 12 hours. After the reaction was completed, the reactants were taken out, washed by deionized water and absolute ethanol for 4 times, and dried for 10 hours to obtain BiOI powder.

[0037] 3) According to the doping amount of Sn:Bi=30%, weigh a certain amount of SnCl 4 ·5H 2 O, dissolve it in deionized water, and add an appropriate amount of Na to the solution after stirring evenly 2 S·9H 2 O (Sn:S=1:2), mix again evenly, add the BiOI powder obtained in 2) to the solution, and ultrasonically disperse for 10 minutes to obtain a p...

Embodiment 2

[0041] 1) Add 5mmol of Bi(NO 3 ) 3 ·5H 2 O, dissolved in 50ml deionized water, according to the molar ratio of elements n Bi :n I =1:1 Weigh quantitative KI, slowly add to the above solution, keep stirring for 60min, adjust the pH so that pH=6.

[0042] 2) Transfer the mixed solution to a homogeneous hydrothermal kettle, put it into a homogeneous reactor, control the filling ratio at 50%, control the reaction temperature at 125°C, and react for 24 hours. After the reaction, the reactants were taken out, washed by deionized water and absolute ethanol for 6 times, and dried for 12 hours to obtain BiOI powder.

[0043] 3) According to the doping amount of Sn:Bi=50%, weigh a certain amount of SnCl 4 ·5H 2 O, dissolve it in deionized water, and add an appropriate amount of Na to the solution after stirring evenly 2 S·9H 2 O (Sn:S=1:2), mix again evenly, add the BiOI powder obtained in 2) to the solution, and ultrasonically disperse for 10 minutes to obtain a precursor.

[...

Embodiment 3

[0047] 1) Add 6mmol of Bi(NO 3 ) 3 ·5H 2 O, dissolved in 60ml deionized water, according to the molar ratio of elements n Bi :n I =1:1 Weigh quantitative KI, slowly add to the above solution, keep stirring for 60min, adjust the pH so that pH=8.

[0048] 2) Transfer the mixed solution to a homogeneous hydrothermal kettle, put it into a homogeneous reactor, control the filling ratio at 60%, control the reaction temperature at 140°C, and react for 18 hours. After the reaction, the reactants were taken out, washed by deionized water and absolute ethanol for 5 times, and dried for 11 hours to obtain BiOI powder.

[0049] 3) According to the doping amount of Sn:Bi=70%, weigh a certain amount of SnCl 4 ·5H 2 O, dissolve it in deionized water, and add an appropriate amount of Na to the solution after stirring evenly 2 S·9H 2 O (Sn:S=1:2), mix again evenly, add the BiOI powder obtained in 2) to the solution, and ultrasonically disperse for 10 minutes to obtain a precursor.

[...

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Abstract

The invention discloses a method for preparing a tin disulfide / bismuth oxyiodide composite photocatalyst with a hydrothermal method. The method comprises the following steps: weighing bismuth nitratepentahydrate and dissolving bismuth nitrate pentahydrate into deionized water; then weighing potassium iodide according to the element molar ratio of Bi to I being equal to 1 to 1, adding a mixed solution, and adjusting the pH value of the mixed solution to 6 to 8; transferring the mixed solution into a homogeneous hydrothermal reactor, and putting the homogeneous hydrothermal reactor into a homogeneous reactor for reaction; after the reaction is ended, carrying out centrifugal washing and drying with the deionized water and absolute ethyl alcohol respectively, thus obtaining bismuth oxyiodidepowder; weighing tin chloride pentahydrate and dissolving tin chloride pentahydrate into the deionized water; after uniform stirring, adding sodium sulfide into the solution, uniformly mixing again,adding the bismuth oxyiodide powder obtained in the former step into the mixed solution and carrying out ultrasonic dispersion to obtain a precursor; transferring the precursor into the homogeneous hydrothermal reactor and the putting the homogeneous hydrothermal reactor into the homogeneous reactor for reaction; after the reaction is ended, taking out a product and then carrying out centrifugal washing and drying with the deionized water and absolute ethyl alcohol respectively on the product, thus obtaining the tin disulfide / bismuth oxyiodide composite photocatalyst.

Description

technical field [0001] The invention relates to the preparation of a bismuth oxyiodide material and a composite method of the two materials, in particular to a method for preparing a tin disulfide / bismuth oxyiodide composite photocatalyst by a hydrothermal method. Background technique [0002] Today, with the increasingly developed industry and economy, problems such as energy shortage and environmental pollution have become urgent. Therefore, it is more practical to develop photocatalysts with visible light activity. The reserves and distribution of bismuth-based materials in my country are higher than the world average, and the hybridization of electron orbits narrows the bandgap width of semiconductors, which greatly broadens the visible light response range of semiconductors. Among them, the bismuth oxyhalide material is the most representative among many bismuth-based materials. The bismuth oxyhalide material BiOX (X=Cl, Br, I) has a unique layered structure, which is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/135B01J37/10B01J35/10A62D3/17A62D101/28A62D101/26
Inventor 殷立雄房佳萌程如亮张浩繁张峰蔺英黄剑锋
Owner SHAANXI UNIV OF SCI & TECH