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Preparation method of flaky silver/silver vanadate composite photocatalyst

A technology of silver vanadate and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to improve quantum yield, strong adsorption, and improve light The effect of the catalytic effect

Active Publication Date: 2016-04-20
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a facile one-pot solvothermal synthesis of Ag / Ag composite heterostructures 3 VO 4 Flake composite powder has not been reported

Method used

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  • Preparation method of flaky silver/silver vanadate composite photocatalyst
  • Preparation method of flaky silver/silver vanadate composite photocatalyst
  • Preparation method of flaky silver/silver vanadate composite photocatalyst

Examples

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Embodiment 1

[0020] The preparation method of silver / silver vanadate composite photocatalyst in the present embodiment is as follows:

[0021] (1) Add 1 / 3 mmol of sodium vanadate to 10 mL of ethanol, and stir magnetically for 1 h to obtain solution a;

[0022] (2) 1 mmol of silver nitrate was added to 10 mL of ethanol, and magnetically stirred for 1 h to obtain solution b;

[0023] (3) Mix solution a and solution b evenly, then transfer to a polytetrafluoroethylene-lined reactor, and react at 120°C for 12 hours; after the reaction, cool to room temperature, and wash with deionized water and absolute ethanol 3 times, vacuum drying at 40° C. for 6 hours to obtain a silver / silver vanadate composite photocatalyst with a heterogeneous structure.

[0024] Add 0.05 g of the prepared silver / silver vanadate composite photocatalyst to 50 mL with a concentration of 2×10 -5 In the methyl orange dye solution of M, the degradation rate of methyl orange dye is about 65% under the irradiation of 350W xe...

Embodiment 2

[0026] The preparation method of silver / silver vanadate composite photocatalyst in the present embodiment is as follows:

[0027] (1) Add 1 / 3 mmol of sodium vanadate to a mixture of 6 mL of water and 4 mL of ethanol, and stir magnetically for 1 h to obtain solution a;

[0028] (2) Add 1 mmol of silver nitrate to a mixture of 6 mL of water and 4 mL of ethanol, and stir magnetically for 1 h to obtain solution b;

[0029] (3) Mix solution a and solution b evenly, then transfer to a polytetrafluoroethylene-lined reactor, and react at 120°C for 12 hours; after the reaction, cool to room temperature, and wash with deionized water and absolute ethanol 3 times, vacuum drying at 40° C. for 6 hours to obtain a silver / silver vanadate composite photocatalyst with a heterogeneous structure.

[0030] Add 0.05 g of the prepared silver / silver vanadate composite photocatalyst to 50 mL with a concentration of 2×10 -5 In the methyl orange dye solution of M, the degradation rate of methyl orang...

Embodiment 3

[0032] The preparation method of silver / silver vanadate composite photocatalyst in the present embodiment is as follows:

[0033] (1) Add 1 / 3 mmol of sodium vanadate to a mixture of 6 mL of water and 4 mL of ethanol, and stir magnetically for 1 h to obtain solution a;

[0034] (2) Add 1 mmol of silver nitrate to a mixture of 6 mL of water and 4 mL of ethanol, and stir magnetically for 1 h to obtain solution b;

[0035] (3) Mix solution a and solution b evenly and transfer to a polytetrafluoroethylene-lined reactor, react at 140°C for 12 hours; after the reaction, cool to room temperature and wash with deionized water and absolute ethanol 3 times, vacuum drying at 40° C. for 6 hours to obtain a silver / silver vanadate composite photocatalyst with a heterogeneous structure.

[0036] Add 0.05 g of the prepared silver / silver vanadate composite photocatalyst to 50 mL with a concentration of 2×10 -5 In the methyl orange dye solution of M, the degradation rate of methyl orange dye i...

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Abstract

The invention discloses a preparation method of a flaky silver / silver vanadate composite photocatalyst. The method comprises steps as follows: sodium vanadate or ammonium metavanadate is added to a mixed liquid of water and ethanol, magnetic stirring is performed for 0.5-1 h, and a solution a is obtained; silver nitrate is added to the mixed liquid of water and ethanol, magnetic stirring is performed for 0.5-1 h, and a solution b is obtained; the solation a and the solution b is evenly mixed, then the mixture is transferred to a reaction kettle provided with a PTFE (polytetrafluoroethylene) lining and reacts at the temperature of 100-140 DEG C for 6-24 h, and the silver / silver vanadate composite photocatalyst adopting a heterostructure is obtained. The obtained composite photocatalyst has the morphology characteristic that silver nanoparticles are supported on a flaky silver vanadate substrate, the particle size of the silver nanoparticles supported on the surface is 50-100 nm, and the diameter of flaky silver vanadate particles is 1-2 mu m. Raw materials used in the method are non-toxic, few by-products are produced in the preparation process, and the method causes small pollution to the environment and is an environment-friendly synthesis technology.

Description

1. Technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a silver / silver vanadate flake composite photocatalyst. 2. Background technology [0002] With the continuous development of human society and industry, global environmental pollution and energy crisis are threatening the survival of human beings. Since Fujishima and Honda first discovered that single-crystal titanium dioxide electrodes can photocatalytically split water, photocatalytic technology has developed rapidly and has become one of the frontier scientific research fields. However, studies in recent decades have shown that TiO 2 The excitation wavelength range is very narrow, only concentrated in the ultraviolet region, and the energy of ultraviolet light in sunlight only accounts for about 5% of the total energy of sunlight, so the utilization rate of solar energy is low. In addition TiO 2 Photocatalysts also have disadvantages such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68
CPCB01J23/682B01J35/393B01J35/61B01J35/39
Inventor 谢劲松丁明赵娣芳邹金军钱邦正
Owner HEFEI UNIV
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