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Preparation method and application of flaky zinc-silicon layered double hydroxyl composite hydroxide photocatalyst

A composite hydroxide, layered double hydroxyl technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the unseen 4-chlorophenol related Reports and other issues, to achieve the effect of abundant reserves, uniform shape and size, and conducive to separation

Inactive Publication Date: 2018-08-14
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, there are no related reports on the photocatalyst and photocatalytic degradation of 4-chlorophenol with flaky zinc-silicon-layered double hydroxyl compound hydroxide (ZnSi-LDH)

Method used

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  • Preparation method and application of flaky zinc-silicon layered double hydroxyl composite hydroxide photocatalyst
  • Preparation method and application of flaky zinc-silicon layered double hydroxyl composite hydroxide photocatalyst
  • Preparation method and application of flaky zinc-silicon layered double hydroxyl composite hydroxide photocatalyst

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Embodiment 1

[0024] a. Sieve the vermiculite to 200 mesh, add 20% by mass fraction into 2mol / L nitric acid solution, react at 40°C for 24 hours, filter, wash with water until neutral, and dry at 60°C for 12 Hours, the silica nanosheets are obtained by grinding, and the silica nanosheets have a sheet structure rich in silicon hydroxyl groups on the surface, in which SiO 2 The content is 80%;

[0025] b. Disperse the silicon dioxide nanosheets in step a in 500mL deionized water, add hexamethylenetetramine, and stir evenly to obtain an alkaline solution;

[0026] c, zinc nitrate is added to the alkali solution containing silicon dioxide in step b, Zn 2+ The ratio to the silica nanosheets is 10mmol / g, and the mixture is continuously stirred at a temperature of 10°C for 10 minutes and then transferred to a reaction kettle for a hydrothermal reaction at a temperature of 150°C for 12 hours. The growth mode of the nanocrystal grains is ZnSi -Continuous epitaxial growth of LDH nanocrystal grains ...

Embodiment 2

[0031] a. Sieve the vermiculite to 300 mesh, add it to 1mol / L hydrochloric acid solution at a mass fraction of 10%, react at a temperature of 50°C for 4 hours, filter, wash with water until neutral, and dry at a temperature of 70°C for 10 Hours, the silica nanosheets are obtained by grinding, and the silica nanosheets have a sheet structure rich in silicon hydroxyl groups on the surface, in which SiO 2 The content is 85%;

[0032] b. Disperse the silicon dioxide nanosheets in step a in 300mL deionized water, add sodium hydroxide, and stir evenly to obtain an alkaline solution;

[0033] c. Zinc chloride is added to the alkali solution containing silicon dioxide in step b, Zn 2+ The ratio of silicon dioxide nanosheets is 15mmol / g, the mixture is transferred to the reactor after stirring for 20 minutes at a temperature of 5°C, and hydrothermally reacted at a temperature of 180°C for 6 hours, the growth mode of the nanocrystalline grains is ZnSi -Continuous epitaxial growth of L...

Embodiment 3

[0037] a. Sieve the vermiculite into 400 meshes, add 30% of the mass fraction into the 3mol / L sulfuric acid solution, react at a temperature of 60°C for 8 hours, filter, wash with water until neutral, and dry at a temperature of 120°C for 4 Hours, the silica nanosheets are obtained by grinding, and the silica nanosheets have a sheet structure rich in silicon hydroxyl groups on the surface, in which SiO 2 The content is 95%;

[0038] b. Disperse the silicon dioxide nanosheets in step a in 200mL deionized water, add tetramethylammonium hydroxide, and stir evenly to obtain an alkaline solution;

[0039] c. Zinc sulfate is added to the alkali solution containing silicon dioxide in step b, Zn 2+ The ratio of silicon dioxide nanosheets is 20mmol / g, the mixture is transferred to the reaction kettle after stirring for 60 minutes at a temperature of 25°C, and the hydrothermal reaction is carried out at a temperature of 120°C for 50 hours, and the growth mode of the nanocrystalline gra...

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Abstract

The invention relates to a flaky zinc-silicon layered double hydroxyl composite hydroxide photocatalyst and its application. The method uses vermiculite as a base raw material, and obtains an active silica base and a silicon ion source by activating its acid, and adopts continuous epitaxy. Using the growth method, a flaky zinc-silicon layered dihydroxy composite hydroxide (ZnSi-LDH) photocatalyst was prepared. The flaky zinc-silicon layered dihydroxy composite hydroxide (ZnSi-LDH) photocatalyst material has a uniform shape and size, a large specific surface, good photocatalytic activity, and can effectively photocatalytically degrade 4-chlorophenol. The preparation method is simple and low-cost, which broadens the synthesis route of LDH, and the obtained material can be widely used in the treatment of environmental pollutants, such as sewage and indoor and outdoor gas pollution purification treatment.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic nanometer materials and treatment of environmental pollutants, and in particular relates to a preparation method and application of a flaky zinc-silicon layered double hydroxyl compound hydroxide (ZnSi-LDH) photocatalyst. Background technique [0002] Photocatalytic degradation of organic pollutants is a new environmental pollutant treatment method that emerged in the 1970s, which can convert toxic organic pollutants in water into CO 2 、H 2 O and inorganic small molecules, etc., to achieve the purpose of harmlessness. In the past few decades, the most favored photocatalytic material is TiO 2 , but there are still defects such as low quantum yield and poor adsorption in practical applications, which directly affect its photocatalytic efficiency and practical application. Therefore, how to obtain new efficient and cheap photocatalytic materials is still an important problem ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06C02F1/32
CPCC02F1/32B01J21/06B01J23/06C02F2305/10C02F2101/36B01J35/615B01J35/39
Inventor 王兰王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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