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Preparation method of carbon dot modified two-dimensional sodium tungstate/tungsten oxide photocatalytic material

A technology of sodium tungstate and tungsten oxide is applied in the fields of environmental sanitation and green agricultural plant protection, solar energy, and photocatalytic nanomaterials. Low, easy-to-use effects

Active Publication Date: 2020-03-10
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to prepare a kind of carbon dot modification through a simple one-step hydrothermal synthesis method in view of the shortcomings of common photocatalytic materials such as low bactericidal performance under visible light, easy recombination of photogenerated electrons and holes, and complex synthesis process. Two-dimensional sodium tungstate / tungsten oxide photocatalytic material

Method used

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  • Preparation method of carbon dot modified two-dimensional sodium tungstate/tungsten oxide photocatalytic material
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  • Preparation method of carbon dot modified two-dimensional sodium tungstate/tungsten oxide photocatalytic material

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Embodiment 1

[0034] The preparation method of the two-dimensional sodium tungstate / tungsten oxide composite material modified by carbon dots in this embodiment, the steps are as follows:

[0035] (1) At room temperature, under the action of magnetic stirring, 6mmol (2.40g) WCl 6 (99% concentration) was added to 30ml ethanol solution to form WCl 6 Alcoholic solution, 0.012mmol (2.12mg) PdCl 2 (99.99% purity) was added to the above solution, stirred vigorously for 30 minutes, and fully dissolved; 30ml of anhydrous ethanol solution dissolved with 36mmol (1.48g) NaOH (97% purity) was mixed with the above solution; the mixture was stirred vigorously for 20 minute;

[0036] (2) Pour the above mixed solution into a polytetrafluoroethylene reactor with a capacity of 100ml, and keep it warm at 180°C for 6 hours to obtain a precipitate;

[0037] (3) Then the precipitate was washed with deionized water and ethanol several times, dried in an oven at 80°C, ground and placed in a muffle furnace, and ...

Embodiment 2

[0042] The preparation method of the two-dimensional sodium tungstate / tungsten oxide composite material modified by carbon dots in this embodiment, the steps are as follows:

[0043] (1) At room temperature, under the action of magnetic stirring, 3mmol (1.20g) WCl 6 (99% concentration) was added to 30ml ethanol solution to form WCl 6 Alcoholic solution, 0.006mmol (0.25mg) PdCl 2 (99.99% purity) was added to the above solution, stirred vigorously for 30 minutes, fully dissolved, and 30ml of ethanol solution dissolved with 18mmol (0.74g) NaOH (97% purity) was mixed with the above solution, and the mixture was stirred vigorously for 20 minutes;

[0044] (2) Pour the above mixed solution into a polytetrafluoroethylene reactor with a capacity of 100ml, and keep it warm at 160°C for 12 hours to obtain a precipitate;

[0045] (3) Then the precipitate was washed with deionized water and ethanol several times, dried in an oven at 80°C, ground and placed in a muffle furnace, and calci...

Embodiment 3

[0048] The preparation method of the two-dimensional sodium tungstate / tungsten oxide composite material modified by carbon dots in this embodiment, the steps are as follows:

[0049] (1) At room temperature, under the action of magnetic stirring, 6mmol (2.19g) WCl 5 (99% concentration) was added to 30ml ethanol solution to form WCl 6 Alcoholic solution, 0.006mmol (0.25mg) PdCl 2 (99.99% purity) was added to the above solution, stirred vigorously for 30 minutes, fully dissolved, and 30ml of anhydrous ethanol solution dissolved with 36mmol (1.48g) NaOH (97% purity) was mixed with the above solution, and the mixture was stirred vigorously for 20 minute;

[0050] (2) Pour the above mixed solution into a polytetrafluoroethylene reaction kettle with a capacity of 100ml, and keep it warm at 180°C for 10 hours to obtain a precipitate;

[0051] (3) Then the precipitate was washed with deionized water and ethanol several times, dried in an oven at 80°C, ground and placed in a muffle ...

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Abstract

The invention discloses an antimicrobial carbon dot modified two-dimensional sodium tungstate / tungsten oxide photocatalytic material preparation method. The preparation method comprises the steps of dissolving a tungsten salt into an alcoholic solution to obtain a tungsten salt solution, then adding palladium chloride, evenly mixing, then adding a sodium hydroxide alcoholic solution, evenly stirring to form a mixed solution, pouring into a reaction kettle and performing constant-temperature reaction for 4 to 14h under the condition of 140 to 220 DEG C to obtain precipitate; repeatedly washingmany times with deionized water and ethyl alcohol, drying and then roasting by a muffle furnace for 2 to 6h under the condition of 300 to 500 DEG C to obtain a carbon dot modified two-dimensional sodium tungstate / tungsten oxide photocatalytic nano material. According to the preparation method disclosed by the invention, different tungsten salts are utilized to be mixed with metal salt palladium chloride, a series of carbon dot modified two-dimensional sodium tungstate / tungsten oxide composite materials are prepared in the different solvents, and the prepared composite materials can kill escherichia coli under visible light in high efficiency and a short time. As the whole operation process is simple and convenient, the method has practical application value.

Description

technical field [0001] The invention belongs to the fields of solar energy, photocatalytic nanomaterials, environmental sanitation and green agricultural plant protection, and specifically relates to a preparation method of a carbon dot-modified two-dimensional sodium tungstate / tungsten oxide photocatalytic material with excellent bactericidal performance under visible light. Background technique [0002] The content of tungsten in my country ranks among the top in the world, so it has broad application prospects. Tungsten oxide WO 3 It is a semiconductor photocatalyst, which is different from the traditional photocatalytic material TiO 2 Compared to WO 3 With a narrow band gap of 2.6eV, TiO 2 It is 3.2eV, can be excited by visible light, and is a potential visible light catalyst. Sodium Tungstate Na 2 W 4 o 13 The bandgap width is 3.1eV, but Na 2 W 4 o 13 The conduction band ratio of WO 3 The conduction band of is more negative and therefore more reducible. Na ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30A01N59/16A01N59/00A01P1/00
Inventor 张静涛石恒真刘炳坤张婕韩冰王雪莹刘行袁明明穆立龙吴亚军
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY