Preparation method of WO3/NaSO4 composite

A composite material and mixed solution technology, applied in catalyst activation/preparation, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high photogenerated charge recombination rate, restricted photocatalytic efficiency, low conduction band potential, etc. Simple process steps, strong adsorption performance, mild reaction conditions

Inactive Publication Date: 2019-05-24
SHAANXI UNIV OF SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that single-phase photocatalysts generally have some insurmountable defects that are not conducive to the progress of photocatalytic reactions. WO 3 Due to the high recombination rate of photogenerated charges and the low conduction band potential, its quantum efficiency is very low, which restricts the photocatalytic efficiency.

Method used

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  • Preparation method of WO3/NaSO4 composite
  • Preparation method of WO3/NaSO4 composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Take analytically pure ammonium metatungstate (H 28 N 6 o 41 W 12 ), using a volume ratio of absolute ethanol:isopropanol=1:1 mixed alcohol to prepare 0.08mol / L solution A;

[0025] 2) in solution A, add analytical grade sodium lauryl sulfate (C 12 h 25 SO 4 Na) magnetic stirring is even, the ratio of the amount of substance that obtains sodium lauryl sulfate and ammonium metatungstate is 0.5: 1 mixed solution B;

[0026] 3) Pour the mixed solution B into a polytetrafluoroethylene-lined high-pressure reactor at a volume filling ratio of 40%, put the sealed reactor into a homogeneous hydrothermal reactor, and react at 160°C for 24 hours;

[0027] 4) After the reaction was completed, the furnace was cooled to room temperature, the final reactant was centrifuged and washed 3 times with absolute ethanol, and the centrifuged material was oven-dried at 50°C for 4 hours to obtain WO 3 / NaSO 4 composite material.

[0028] The obtained rod-shaped WO with nanowires ev...

Embodiment 2

[0032] 1) Take analytically pure ammonium metatungstate (H 28 N 6 o 41 W 12 ), use a volume ratio of absolute ethanol:isopropanol=1:0.5 mixed alcohol to prepare 0.05mol / L solution A;

[0033] 2) in solution A, add analytical grade sodium lauryl sulfate (C 12 h 25 SO 4 Na) magnetic stirring is even, the ratio of the amount of substance that obtains sodium lauryl sulfate and ammonium metatungstate is 0.3: 1 mixed solution B;

[0034] 3) Pour the mixed solution B into a polytetrafluoroethylene-lined high-pressure reactor at a volume filling ratio of 60%, put the sealed reactor into a homogeneous hydrothermal reactor, and react at 150°C for 12 hours;

[0035] 4) After the reaction was completed, the furnace was cooled to room temperature, the final reactant was centrifuged and washed 3 times with absolute ethanol, and the centrifuged material was dried in an oven at 40°C for 6 hours to obtain WO 3 / NaSO 4 composite material.

[0036] Uniformly distributed linear WO obtain...

Embodiment 3

[0038] 1) Take analytically pure ammonium metatungstate (H 28 N 6 o 41 W 12 ), using a mixed alcohol with a volume ratio of absolute ethanol:isopropanol=1:2 to prepare a 1mol / L solution A;

[0039] 2) in solution A, add analytical grade sodium lauryl sulfate (C 12 h 25 SO 4 Na) magnetic stirring is even, the ratio of the amount of substance that obtains sodium lauryl sulfate and ammonium metatungstate is 0.8: 1 mixed solution B;

[0040] 3) Pour the mixed solution B into a polytetrafluoroethylene-lined high-pressure reactor at a volume filling ratio of 30%, put the sealed reactor into a homogeneous hydrothermal reactor, and react at 140°C for 28 hours;

[0041] 4) After the reaction was completed, it was cooled to room temperature with the furnace, and the final reactant was centrifuged and washed 3 times with absolute ethanol, and the centrifuged material was dried in an oven at 60°C for 3 hours to obtain WO 3 / NaSO 4 composite material.

[0042] The evenly distribut...

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Abstract

A preparation method of a WO3/NaSO4 composite includes preparing a solution A by dissolving analytically pure ammonium metatungstate in mixed alcohols; adding analytically pure lauryl sodium sulfate in the solution A to obtain a mixed solution B; pouring the mixed solution B in a polytetrafluoroethylene-lined high-pressure reactor to perform hydrothermal reaction, cooling to the room temperature after the reaction, washing the final product with absolute ethyl alcohol, and then drying the washed product to obtain the WO3/NaSO4 composite. By a solvothermal method of a wet synthesis process, theprecursor is dissolved in a non-aqueous solvent, reactants disperse in the solution and become much active on a liquid-phase or supercritical condition, thereby facilitating the reaction. Nanocrystalline particles prepared by the solvothermal method have small size, high degree of crystallinity and large specific surface area. The lauryl sodium sulfate surfactant is introduced so as to achieve dual functions, namely morphology adjusting and composite forming.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a WO 3 / NaSO 4 Methods of preparation of composite materials. Background technique [0002] Dyes are organic substances that can make fiber materials or other substances obtain bright and solid colors. Dyes are soluble in water solvents, or can be converted into solutions for dyeing. The dyes used in the early days are all natural. In recent years, my country's dye, paper, chemical and other industries have developed rapidly. According to statistics, about 100 million tons of dye wastewater in my country flow into various water bodies every year. High-concentration dye wastewater has complex components, high concentration, high chroma, and properties. Stable, not easily degraded and thus difficult to handle. Since the first discovery of single crystal TiO by Fujishima et al. in 1972 2 After being able to photocatalytically split water on the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/055B01J37/10C02F1/30C02F101/34C02F101/38
Inventor 黄剑锋海国娟冯亮亮曹丽云介燕妮杨佳付常乐吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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