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Preparation method and application of flaky zinc-silicon layered double hydroxides 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 rich reserves, small thickness, and increased reaction

Inactive Publication Date: 2016-11-16
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 hydroxides photocatalyst
  • Preparation method and application of flaky zinc-silicon layered double hydroxides photocatalyst
  • Preparation method and application of flaky zinc-silicon layered double hydroxides photocatalyst

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Effect test

Embodiment 1

[0024] a. Pass the vermiculite through a sieve of 200 meshes, add 20% by mass to a 2mol / L nitric acid solution, react for 24 hours at a temperature of 40℃, filter, wash with water to neutral, and dry at a temperature of 60℃12 After hours, the silicon dioxide nanosheets are obtained after grinding. The silicon dioxide nanosheets have a lamellar structure rich in silicon hydroxyl groups on the surface. 2 The content is 80%;

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

[0026] c. Add zinc nitrate to the alkaline solution containing silicon dioxide in step b, Zn 2+ The ratio to the silicon dioxide nanosheets is 10mmol / g. The mixture is stirred at a temperature of 10°C for 10 minutes and then transferred to a reactor, where it is hydrothermally reacted at a temperature of 150°C for 12 hours. The growth method of the nanocrystalline particles is ZnSi -LDH nanocrysta...

Embodiment 2

[0031] a. Pass the vermiculite through a sieve of 300 mesh, add 10% by mass to a 1mol / L hydrochloric acid solution, react at a temperature of 50℃ for 4 hours, filter, wash with water to neutrality, and dry at a temperature of 70℃ for 10 After hours, the silicon dioxide nanosheets are obtained after grinding. The silicon dioxide nanosheets have a lamellar structure rich in silicon hydroxyl groups on the surface. 2 The content is 85%;

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

[0033] c. Add zinc chloride to the alkali solution containing silicon dioxide in step b, Zn 2+ The ratio to the silica nanosheets is 15mmol / g. The mixture is stirred at a temperature of 5°C for 20 minutes and then transferred to the reactor, where it is hydrothermally reacted at a temperature of 180°C for 6 hours. The growth method of nanocrystals is ZnSi -LDH nanocrystalline grains are conti...

Embodiment 3

[0037] a. Pass the vermiculite through a sieve of 400 mesh, add 30% by mass to a 3mol / L sulfuric acid solution, react at a temperature of 60°C for 8 hours, filter, wash with water to neutral, and dry at a temperature of 120°C 4 After hours, the silicon dioxide nanosheets are obtained after grinding. The silicon dioxide nanosheets have a lamellar structure rich in silicon hydroxyl groups on the surface. 2 The content is 95%;

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

[0039] c. Add zinc sulfate to the alkaline solution containing silicon dioxide in step b, Zn 2+ The ratio to the silica nanosheets is 20mmol / g. The mixture is stirred at a temperature of 25°C for 60 minutes and then transferred to a reactor, where it is hydrothermally reacted at a temperature of 120°C for 50 hours. The growth method of nanocrystals is ZnSi -LDH nanocrystalline grains are ...

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Abstract

The invention relates to a preparation method and an application of a flaky zinc-silicon layered double hydroxides photocatalyst. According to the method, vermiculite is used as a base material, and is subjected to acid activation to obtain an active silicon dioxide base and a silicon ion source, and the flaky zinc-silicon layered double hydroxides (ZnSi-LDH) photocatalyst is prepared by adopting a continuous epitaxial growth manner. The flaky zinc-silicon layered double hydroxides (ZnSi-LDH) photocatalyst is uniform in form and size of materials, has a relatively large in specific area, is relatively good in photocatalytic activity, and can effectively degrade 4-chlorophenol through photocatalysis. The preparation method is simple, is low in cost, and broadens a synthetic route of LDH, and an obtained material can be widely applied to treatment of environmental pollutants, such as purification treatment of sewage, indoor and outdoor gas pollution and the like.

Description

Technical field [0001] The invention belongs to the technical field of photocatalytic nano material preparation and environmental pollutant treatment, and specifically relates to a preparation method and application of a flaky zinc-silicon layered double hydroxyl composite 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 bodies into CO 2 , H 2 O and small inorganic molecules, etc., achieve the goal of harmlessness. In the past few decades, the most popular photocatalytic material is TiO 2 However, in practical applications, there are still defects such as low quantum yield and poor adsorption, which directly affect its photocatalytic efficiency and practical applications. Therefore, how to obtain new high-efficiency and low-cost photocatalytic materials is still an important problem faced...

Claims

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Application Information

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Patent Type & Authority Applications(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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