Preparation method of Bi12SiO20-Bi2O2SiO3/rGO photocatalyst

A photocatalyst, mass ratio technology, applied in the field of materials, can solve the problem of low photocatalytic efficiency, achieve high specific surface area, improve degradation efficiency, and improve the effect of separation

Inactive Publication Date: 2021-03-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Bi 12 SiO 20 -Bi 2 o 2 SiO 3 The composite powder exhibits a certain visible light absorption ability, and with the n Bi :n Si The visible light absorption capacity of the composite powder increases gradually, and the composite powder has a certain visible light photocatalytic activity, but the bismuth-based photogenerated electron-hole pairs are easy to recombine, resulting in low photocatalytic efficiency.

Method used

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  • Preparation method of Bi12SiO20-Bi2O2SiO3/rGO photocatalyst
  • Preparation method of Bi12SiO20-Bi2O2SiO3/rGO photocatalyst
  • Preparation method of Bi12SiO20-Bi2O2SiO3/rGO photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) get 0.5g graphite powder and concentration and be 98wt% vitriol oil with mass ratio m 石墨粉 :m 浓硫酸 = 1:70 mixing, stirring for about 30 minutes and adding 3g of KMnO with a mass ratio of about 5.5:1 4 and NaNO 3 The mixture was placed in an ice-water bath and stirred for 2 h, then placed in a 30°C water bath and stirred for about 2 h, and 130 mL of H 2 O, the temperature of the water bath was raised to 90°C, and the stirring was continued for about 2 hours to obtain a uniform mixed solution;

[0024] (2) Add 1 mL of 30% H to the above mixed solution 2 o 2 The solution was washed with deionized water, dried at 60°C, and dispersed ultrasonically (for about 30 minutes) to obtain graphene oxide, which was added to water to obtain a graphene oxide suspension;

[0025] (3) Mix absolute ethanol and deionized water (volume ratio is about 1.8:1), add a certain amount of citric acid (after adding, the concentration of citric acid is 0.006mol / L), and add a certain amount of...

Embodiment 2

[0030] (1) Take 0.4g and mix it with 98wt% concentrated sulfuric acid (mass ratio 1:75), stir for about 40min and add 4g of a certain amount of KMnO 4 and NaNO 3 (mass ratio is about 7:1), put it in an ice-water bath and stir for 2.5 hours, then put it in a 30°C water bath and stir for about 2 hours, add 150mLH 2 O, the temperature of the water bath was raised to 100°C, and the stirring was continued for about 2 hours to obtain a uniform mixed solution;

[0031] (2) Add 3 mL of 30% H to the above mixed solution2 o 2 The solution was washed with deionized water, dried at 65°C, and then ultrasonically dispersed (about 30 minutes) to obtain graphene oxide;

[0032] (3) Mix absolute ethanol with deionized water (volume ratio is about 2:1), add a certain amount of citric acid (concentration is 0.006mol / L) to it, and add a certain amount of bismuth nitrate ( Concentration is 0.005mol / L), stirred for about 1h until completely dissolved. At the same time, according to the ratio of...

Embodiment 3

[0037] (1) Take 0.4g and mix it with 98wt% concentrated sulfuric acid (mass ratio is 1:90), stir for about 50min and add 3.5g KMnO 4 and NaNO 3 (mass ratio is about 7:1), put it in an ice-water bath and stir for 2.5h, then put it in a 40°C water bath and stir for about 2h, add 130mLH 2 O, the temperature of the water bath was raised to 90°C, and the stirring was continued for about 2.5 hours to obtain a uniform mixed solution;

[0038] (2) Add 3mL of H 2 o 2 solution (30%), washed with deionized water, dried at 65°C, and dispersed by ultrasonic (about 30min) to obtain graphene oxide;

[0039] (3) Mix absolute ethanol with deionized water (volume ratio is about 2:1), add a certain amount of citric acid (concentration is 0.005mol / L) to it, and add a certain amount of bismuth nitrate ( Concentration is 0.006mol / L), stirred for about 1h until completely dissolved. At the same time, weigh a certain amount of tetraethyl orthosilicate and dissolve it in a certain amount of water...

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Abstract

The invention relates to a preparation method of a Bi12SiO20-Bi2O2SiO3/rGO photocatalyst, which utilizes the high conductivity and high specific surface area of graphene oxide (rGO) to load Bi12SiO20-Bi2O2SiO3 composite powder on the graphene oxide to promote the separation of photo-induced electron-hole pairs, and the obtained product has high specific surface area, can effectively adsorb organicsolvents, is easy to recover and does not generate secondary pollution. The production process is simple, equipment is simple, and the period is short.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a Bi 12 SiO 20 -Bi 2 o 2 SiO 3 / rGO photocatalyst preparation method. Background technique [0002] Bi 12 SiO 20 -Bi 2 o 2 SiO 3 The composite powder exhibits a certain visible light absorption ability, and with the n Bi :n Si The visible light absorption capacity of the composite powder increases gradually, and the composite powder has certain visible light photocatalytic activity, but the bismuth-based photogenerated electron-hole pairs are easy to recombine, resulting in low photocatalytic efficiency. Contents of the invention [0003] In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of Bi 12 SiO 20 -Bi 2 o 2 SiO 3 The preparation method of / rGO photocatalyst utilizes the high conductivity and high specific surface area of ​​graphene oxide (rGO) by adding Bi 12 SiO 20 -Bi 2 o 2 S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J21/18B01J37/03B01J37/08B01J37/34B01J37/16B01J37/10C01B32/198C02F1/30C02F1/28C02F101/34C02F101/36C02F101/38
CPCB01J23/18B01J21/18B01J23/002B01J35/004B01J37/036B01J37/08B01J37/343B01J37/16B01J37/10C02F1/30C02F1/281C02F1/288C01B32/198C02F2305/10C02F2101/308C02F2101/34C02F2101/36C02F2101/38
Inventor 伍媛婷胡靖悦曾柏林关梦瑶
Owner SHAANXI UNIV OF SCI & TECH
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