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Graphene oxide/silver phosphate composite photocatalyst as well as preparation method and application thereof

A silver phosphate, composite light technology, applied in the field of photocatalytic materials, can solve the problems of reducing structural stability, photocorrosion, etc., and achieve the effects of good stability, great development and application prospects, and good photocatalytic degradation characteristics

Inactive Publication Date: 2017-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However due to Ag 3 PO 4 Slightly soluble in water and prone to photocorrosion, which reduces the stability of its structure

Method used

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  • Graphene oxide/silver phosphate composite photocatalyst as well as preparation method and application thereof
  • Graphene oxide/silver phosphate composite photocatalyst as well as preparation method and application thereof
  • Graphene oxide/silver phosphate composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Measure 3 mL of GO solution with a concentration of 1 mg / mL in 10 mL of water, and ultrasonically disperse for 30 min in an ultrasonicator with P=100 W to obtain a GO dispersion;

[0032] (2) Weigh 1.02g AgNO 3 Dissolved in 10mL of water, then added dropwise to the GO dispersion in step (1), at a rate of 25 drops / min, and stirred for 1h (400r / min) in the dark at room temperature to obtain a mixed dispersion;

[0033] (3) Weigh 0.716g Na 2 HPO 4 12H 2 O was dissolved in 20mL of water, then added dropwise to the mixed dispersion in step (2), at a rate of 25 drops / min, and stirred for 4h (400r / min) in the dark at room temperature to form a precipitate;

[0034] (4) The precipitate obtained in step (3) was centrifuged, washed repeatedly with distilled water for 3 times, and dried in vacuum at 60°C for 12 hours to obtain GO / Ag 3 PO 4 (Because there will be mass loss in the actual preparation, by calculating the weight of GO as Ag 3 PO 4 1% by weight (w=1%) composi...

Embodiment 2

[0036] (1) Measure 9 mL of GO solution with a concentration of 1 mg / mL in 10 mL of water, and sonicate for 40 min in an ultrasonicator with P=100 W until GO is completely dispersed in water to obtain a GO dispersion;

[0037] (2) Weigh 1.02g AgNO3 Dissolved in 10mL of water, then added dropwise to the GO dispersion in step (1), at a rate of 25 drops / min, and stirred for 1h (400r / min) in the dark at room temperature to obtain a mixed dispersion;

[0038] (3) Weigh 0.716g Na 2 HPO 4 12H 2 O was dissolved in 20mL of water, then added dropwise to the mixed dispersion in step (2), at a rate of 25 drops / min, and stirred for 4h (400r / min) in the dark at room temperature to form a precipitate;

[0039] (4) The precipitate obtained in step (3) was centrifuged, washed repeatedly with distilled water 4 times, and dried in vacuum at 65°C for 12 hours to obtain GO / Ag 3 PO 4 (The weight of GO is Ag 3 PO 4 3% by weight (w=3%) composite photocatalyst namely GO / Ag 3 PO 4 (3%).

Embodiment 3

[0041] (1) Measure 15 mL of GO solution with a concentration of 1 mg / mL in 10 mL of water, and sonicate for 40 min in an ultrasonicator with P=100 W until GO is completely dispersed in water to obtain a GO dispersion;

[0042] (2) Weigh 1.02g AgNO 3 Dissolved in 10mL of water, then added dropwise to the GO dispersion in step (1), at a rate of 25 drops / min, and stirred for 1h (400r / min) in the dark at room temperature to obtain a mixed dispersion;

[0043] (3) Weigh 0.716g Na 2 HPO 4 12H 2 O was dissolved in 20mL of water, then added dropwise to the mixed dispersion formed in step (2), at a rate of 25 drops / min, and stirred for 4h (400r / min) in the dark at room temperature to form a precipitate;

[0044] (4) The precipitate obtained in step (3) was centrifuged, washed repeatedly with distilled water for 5 times, and dried in vacuum at 60°C for 12 hours to obtain GO / Ag 3 PO 4 (The weight of GO is Ag 3 PO 4 5% by weight (w=5%) composite photocatalyst namely GO / Ag 3 PO 4 ...

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Abstract

The invention belongs to the technical field of photocatalytic materials and discloses a graphene oxide / silver phosphate composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) ultrasonically dispersing graphene oxide into water, so as to obtain graphene oxide dispersion liquid; (2) dropwise adding a silver nitrate water solution into the graphene oxide dispersion liquid obtained in the step (1), and stirring at a light-shading state, so as to obtain mixed dispersion liquid; (3) dropwise adding a disodium hydrogen phosphate water solution into the mixed dispersion liquid, stirring at a light-shading state to react, carrying out centrifugation, washing, and drying, so as to obtain the graphene oxide / silver phosphate composite photocatalyst. The photocatalyst has high photocatalytic activity and good stability; the preparation method is simple and suitable for batch production; and the photocatalyst can be applied to catalytic degradation of organic pollutants such as rhodamine B under the irradiation of visible light.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a graphene oxide / silver phosphate composite photocatalyst and its preparation and application. Background technique [0002] Photocatalytic technology uses light and catalysts to act together to produce photochemical reactions, which has certain advantages for the removal of organic substances that are difficult to biodegrade. Traditional TiO 2 Photocatalyst has the advantages of cheap and non-toxic, stable chemical properties, strong light corrosion resistance and high oxidation ability, and has been widely used. However, it can only absorb ultraviolet light with a wavelength less than 380nm in sunlight, and the utilization rate of sunlight is very low. Low. [0003] Silver phosphate (Ag 3 PO 4 ) as a newly discovered visible light photocatalyst in recent years, it can absorb sunlight with a wavelength of less than 530nm, and has a quantum yield ...

Claims

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Application Information

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IPC IPC(8): B01J27/18C02F1/30C02F101/38C02F101/34
CPCC02F1/30B01J27/1817C02F2305/10C02F2101/34C02F2101/38B01J35/39
Inventor 牛晓君王杰
Owner SOUTH CHINA UNIV OF TECH
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