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BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst, preparation method and application thereof

A technology of catalyst and compound light, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problem of low utilization rate of sunlight and difficulty in using far-infrared light, etc. problems, to achieve the effect of improving separation efficiency, simple process and simple operation

Active Publication Date: 2018-12-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the photocatalysts currently reported only respond to ultraviolet light or ultraviolet-visible light, and it is difficult to utilize near-infrared light and far-infrared light, which account for about 43% of sunlight, and the utilization rate of sunlight is low.

Method used

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  • BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst, preparation method and application thereof
  • BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst, preparation method and application thereof
  • BiO2-x/Bi2O2.75/Zn2SnO4 composite photocatalyst, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Step 1: Add 0.5g NaBiO 3 Dissolve the powder into 20mL 3.0mol / L NaOH solution, and magnetically stir to obtain solution A;

[0040] Step 2: Slowly disperse solution A into 20mL deionized water under magnetic stirring conditions to obtain a reaction precursor;

[0041] Step 3: Add the reaction precursor solution into the hydrothermal reaction kettle, place the hydrothermal reaction kettle in the hydrothermal synthesis instrument, and react at 170°C for 40 minutes; the filling ratio of the reaction precursor solution is 60%;

[0042] Step 4: After the reaction is completed, cool naturally to 70°C, take out the precipitate in the hydrothermal reaction kettle, wash with deionized water and absolute ethanol, and finally dry at a constant temperature at 70°C to obtain Bi 2 o 2.75 / BiO 2-x Composite photocatalysts, denoted as BiO-OVs.

Embodiment 2

[0044] Step 1: With Zn(NO 3 ) 2 ·6H 2 O is Zn source, SnCl 4 ·5H 2 O is the Sn source, and deionized water is used as the solvent to prepare the precursor solution. Use 1mol / L NaOH solution to adjust the pH value of the precursor solution to 8, and react at 220°C for 3 hours to prepare Zn by hydrothermal method. 2 SnO 4 catalyst of light.

[0045] Step 2: Add 0.5g NaBiO 3 Dissolve the powder into 20ml of 3.0mol / L NaOH solution, and magnetically stir to obtain solution A;

[0046] Step 3: Slowly disperse solution A into 20mL deionized water under the condition of magnetic stirring, add 0.03g Zn 2 SnO 4 The powder was ultrasonicated for 30 minutes to obtain the reaction precursor;

[0047] Step 4: Add the reaction precursor solution into the hydrothermal reaction kettle, place the hydrothermal reaction kettle in the hydrothermal synthesis instrument, and react at 170°C for 40 minutes; the filling ratio of the reaction precursor solution is 60%;

[0048] Step 5: After t...

Embodiment 3

[0050] Step 1: With Zn(NO 3 ) 2 ·6H 2 O is Zn source, SnCl 4 ·5H 2 O is the Sn source, using deionized water as the solvent, using 1mol / L NaOH solution to adjust the pH value of the precursor solution to 8, and reacting at 220°C for 3 hours by hydrothermal method to prepare Zn 2 SnO 4 catalyst of light.

[0051] Step 2: Add 0.5g NaBiO 3 Dissolve the powder into 20ml of 3.0mol / L NaOH solution, and magnetically stir to obtain solution A;

[0052] Step 3: Slowly disperse solution A into 20mL deionized water under the condition of magnetic stirring, add 0.06g Zn 2 SnO 4 The powder was ultrasonicated for 30 minutes to obtain the reaction precursor;

[0053] Step 4: Add the reaction precursor solution into the hydrothermal reaction kettle, place the hydrothermal reaction kettle in the hydrothermal synthesis instrument, and react at 170°C for 40 minutes; the filling ratio of the reaction precursor solution is 60%;

[0054] Step 5: After the reaction is completed, cool natur...

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Abstract

The invention discloses a BiO2-x / Bi2O2.75 / Zn2SnO4 composite photocatalyst, a preparation method and the application thereof. The preparation method comprises the steps of adding NaBiO3 to a NaOH solution and stirring uniformly to obtain a solution A; dispersing the solution A into water, adding Zn2SnO4 and mixing uniformly to obtain a reaction precursor solution; and hydrothermally reacting the reaction precursor solution to obtain the BiO2-x / Bi2O2.75 / Zn2SnO4 composite photocatalyst. The BiO2-x / Bi2O2.75 / Zn2SnO4 composite photocatalyst has oxygen vacancies, and the oxygen vacancies can broadenthe photoresponse of the catalyst to the near infrared range and the far infrared range; the Zn2SnO4 is closely attached to the surface of the bismuth oxide, and can form a cross energy band structurewith the bismuth oxide compound, thereby improving the separation efficiency of current carriers, and improving the reactivity of the photocatalyst.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to a BiO 2-x / Bi 2 o 2.75 / Zn 2 SnO 4 Composite photocatalyst and its preparation method and application. Background technique [0002] At present, environmental pollution is becoming more and more serious, especially air pollution and water pollution, which have affected the normal life of human beings. So far, the most commonly used methods for treating polluted water bodies are the following, such as flotation, evaporation, extraction, redox, flocculation, etc. Although suspended solids and some organic pollutants can be removed, they are difficult to degrade Organic matter, the effect is very poor, and often cause secondary pollution. Compared with the above methods, semiconductor photocatalysis technology can completely degrade organic matter into non-toxic inorganic small molecules, the effect is good, and the cost is low with sunlight as the driving force, which has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J35/00B01J37/10C02F1/30C02F101/30
CPCC02F1/30B01J23/18B01J37/10C02F2101/30B01J35/39
Inventor 谈国强王敏张丹李斌任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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