Alpha/beta-bismuth oxide phase heterojunction photocatalyst as well as preparation method and application thereof

A photocatalyst and bismuth source technology, applied in the field of photocatalysis, can solve the problems of low photocatalytic activity, complex synthesis method and high energy consumption, and achieve the effects of overcoming low photocatalytic activity, cheap and easily available raw materials, and simplifying the reaction system

Active Publication Date: 2017-05-31
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a single Bi 2 o 3 There are still the following problems: the photogenerated electrons and holes are easy to recombine, and the photocatalytic activity is low
[0010] 1. The synthesis method is complex and the production cost is high;
[0011] 2. The temperature required in the reaction process or calcination process is high, the synthesis time is long, the energy consumption is high, and the synthesis cost is increased;
[0012] 3. The organic solvent (benzyl alcohol) used in the existing preparation process is toxic, has anesthesia effect, has a strong stimulating effect on the eyes, skin and respiratory system, and is harmful to the body if swallowed, inhaled or in contact with the skin;
[0013] 4. The prepared photocatalyst has low activity and cannot achieve efficient and rapid removal of organic pollutants

Method used

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  • Alpha/beta-bismuth oxide phase heterojunction photocatalyst as well as preparation method and application thereof
  • Alpha/beta-bismuth oxide phase heterojunction photocatalyst as well as preparation method and application thereof
  • Alpha/beta-bismuth oxide phase heterojunction photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Dissolve 4 mmol of bismuth nitrate in 70 mL of ethylene glycol, and stir magnetically for 30 min at room temperature;

[0049] (2) Add 0.5mL aniline to the above solution and continue to stir for 10min;

[0050] (3) Transfer the above mixed solution to a 100mL reaction kettle, put it in an oven at 180°C for 12h, and obtain a brown solid;

[0051] (4) The solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0052] (5) Take out the dried solid and grind it with an agate mortar to obtain a dry bismuth-based precursor powder;

[0053] (6) Put the precursor powder into a muffle furnace and calcinate at 300°C for 1.0h to obtain a yellow-green powder, which is α / β-Bi 2 o 3 catalyst of light.

[0054] 5mgα / β-Bi 2 o 3The photocatalyst was added to the EE2 solution with a concentration of 3 mg / L, and after 30 minutes of dark reaction, photocatalytic degradation was carried out u...

Embodiment 2

[0056] (1) Dissolve 2 mmol of basic bismuth nitrate in 70 mL of glycerol, and stir magnetically at room temperature for 30 min;

[0057] (2) Add 0.5mL aniline to the above solution and continue to stir for 10min;

[0058] (3) Transfer the above mixed solution into a 100mL reaction kettle, put it in an oven at 180°C for 12h, and obtain a light brown solid;

[0059] (4) The solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0060] (5) Take out the dried solid and grind it with an agate mortar to obtain a dry bismuth-based precursor powder;

[0061] (6) Put the precursor powder into a muffle furnace and calcinate at 300°C for 1.0h to obtain a yellow-green powder, which is α / β-Bi 2 o 3 catalyst of light.

[0062] 5mg α / β-Bi 2 o 3 The photocatalyst was added to the E2 solution with a concentration of 3 mg / L, and after dark reaction for 30 minutes, the photocatalytic degradation was ...

Embodiment 3

[0064] (1) Dissolve 4mmol sodium bismuthate in 70mL benzyl alcohol, and stir magnetically for 30min at room temperature;

[0065] (2) Add 1.5mL of aniline to the above solution and continue to stir for 10min;

[0066] (3) Transfer the above mixed solution to a 100mL reaction kettle, put it in an oven at 180°C for 12h, and obtain a black solid;

[0067] (4) The solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0068] (5) Take out the dried solid and grind it with an agate mortar to obtain a dry bismuth-based precursor powder;

[0069] (6) Put the precursor powder into a muffle furnace and calcinate at 300°C for 1.0h to obtain a yellow powder, which is α / β-Bi 2 o 3 catalyst of light.

[0070] 5mg α / β-Bi 2 o 3 The photocatalyst was added to the EE2 solution with a concentration of 3 mg / L, and after 30 minutes of dark reaction, photocatalytic degradation was carried out under the ...

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Abstract

The invention provides an alpha/beta-Bi2O3 phase heterojunction photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: firstly dissolving 2-4mmol of a bismuth source material in 70mL of a reductive solvent, magnetically stirring for 30 minutes under the room temperature, then adding 0-2.0mL of aniline into the solution, and continuing to stir for 10 minutes; transferring the mixed solution into a reactor, putting the mixed solution in a drying oven for carrying out solvothermal reaction for 8-12 hours at the temperature of 150-180 DEG C to obtain a bismuth-based precursor; washing, drying and grinding the precursor, putting the precursor in a muffle furnace for calcining for 0.5-2.0 hours at the temperature of 300 DEG C to obtain yellowish green powder which is the alpha/beta-Bi2O3 phase heterojunction photocatalyst. The prepared alpha/beta-Bi2O3 phase heterojunction photocatalyst is used for degrading organic pollutants in water; compared with commercial TiO2 (P25), pure-phase alpha-Bi2O3 and pure-phase beta-Bi2O3 photocatalysts, the alpha/beta-bismuth oxide phase heterojunction photocatalyst has higher visible-light catalytic activity.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to an α / β-Bi 2 o 3 Preparation method and application of phase heterojunction photocatalyst. Background technique [0002] Photocatalytic technology has the advantages of high efficiency, low cost, no secondary pollution, and easy operation. Using semiconductors as photocatalysts and using sunlight as a light source to photocatalytically degrade organic and inorganic pollutants in air and water environments has already attracted widespread attention. Semiconductor photocatalysts widely used today are mainly transition metal oxides, such as TiO 2 , ZnO, Fe 2 o 3 etc., where TiO 2 It has been extensively studied for its excellent optoelectronic properties. However, TiO 2 still has two defects that limit its practical application: (1) TiO 2 The band gap is 3.2eV, and it can only absorb ultraviolet light with a wavelength below 387nm, and ultraviolet light only accounts for about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C02F1/30C02F101/30
CPCB01J23/18B01J35/004C02F1/30C02F2101/30C02F2305/10
Inventor 蒋峰芝史颖颖张叶飞王珊陈宇龙艳菊李领鑫
Owner YUNNAN UNIV
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