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A kind of rgo/silver silicate composite material and its preparation method and application

Inactive Publication Date: 2020-04-07
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For widely studied photocatalytic materials such as titanium dioxide and zinc oxide, there are the following problems: (1) the utilization efficiency of visible light is low, because of its high band gap and narrow light absorption range, it can only absorb 5% of the ultraviolet light in sunlight
Preparation of Ag by Solid Phase Method and Precipitation Method 10 Si 4 o 13 materials, there are problems of large particle size, easy agglomeration, and small specific surface area; at the same time, Ag 10 Si 4 o 13 The problem of high photogenerated carrier recombination rate of the material remains unsolved

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  • A kind of rgo/silver silicate composite material and its preparation method and application
  • A kind of rgo/silver silicate composite material and its preparation method and application
  • A kind of rgo/silver silicate composite material and its preparation method and application

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preparation example Construction

[0030] The invention provides a rGO / Ag 10 Si 4 O 13 The preparation method of the composite material includes the following steps:

[0031] (1) Mix citric acid, absolute ethanol and ethyl orthosilicate to obtain a mixed solution;

[0032] (2) Add water dropwise to the mixed solution obtained in the step (1), stir and age to obtain a silicic acid sol;

[0033] (3) Mixing graphene hydrosol with silicic acid sol to obtain graphene-silicic acid sol;

[0034] (4) Add a silver nitrate solution dropwise to the graphene-silicic acid sol obtained in the step (3), perform a complexation reaction, and dry after standing to obtain a precursor;

[0035] (5) Heat the precursor obtained in step (4) to obtain GO / Ag 10 Si 4 O 13 material;

[0036] (6) The GO / Ag obtained in step (5) 10 Si 4 O 13 Material reduction treatment to obtain the rGO / Ag 10 Si 4 O 13 Composite materials.

[0037] In the present invention, citric acid, absolute ethanol and ethyl orthosilicate are mixed to obtain a mixed solution. In...

Embodiment 1

[0059] (1) Mix 0.43 g of citric acid with 5.2 mL of absolute ethanol and stir until completely dissolved; add 1 mL of ethyl orthosilicate to the above solution and stir to obtain a mixed solution;

[0060] (2) Add 0.33 mL of distilled water dropwise (with a dropping rate of 0.04 mL / s) to the resulting mixed solution, stir for 1 hour and then seal for 15 days to obtain a silicic acid sol;

[0061] (3) Mix 4.394 g of graphene sol (solid-liquid ratio of 0.003564) and 6.53 mL of silicic acid sol, stir for 1 hour to make the distribution uniform, and then sonicate for 6 hours to obtain graphene-silicic acid sol;

[0062] (4) Put 1.9g AgNO 3 Mix with 5 mL of distilled water to obtain a silver nitrate solution; add the obtained silver nitrate solution dropwise (with a dropping rate of 0.04 mL / s) to the graphene-silicic acid sol, carry out the complexation reaction under stirring conditions for 2 hours, and let stand still 12h, put it in a 100℃ oven for drying and grinding to obtain the prec...

Embodiment 2

[0067] (1) Mix 0.086 g of citric acid with 5.2 mL of absolute ethanol, and stir until completely dissolved; add 1 mL of ethyl orthosilicate to the above solution and stir to obtain a mixed solution;

[0068] (2) Add 0.33 mL of distilled water (with a dropping rate of 0.04 mL / s) to the resulting mixed solution, stir for 1 hour, seal the mouth and age for 15 days to obtain a silicic acid sol;

[0069] (3) Mix 4.394 g of graphene sol (solid-to-liquid ratio of 0.003564) with 6.53 mL of silicic acid sol, stir for 1 hour to make it evenly distributed, and then sonicate for 6 hours to obtain graphene-silicic acid sol;

[0070] (4) Put 1.9g AgNO 3 Mix with 5 mL of distilled water to obtain a silver nitrate solution; add the obtained silver nitrate solution dropwise (with a dropping rate of 0.04 mL / s) to the obtained graphene-silicic acid sol, carry out the complexation reaction under stirring conditions for 2 hours, and then stand for 12 hours , Put it into a 100℃ oven for drying and grindin...

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Abstract

The invention provides an rGO / silver silicate composite and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. By the combination of rGO andAg10Si4O13, a composite photocatalyst with smaller particle size (about 25 nm) and more uniform grain distribution is successfully prepared. At the same time, because of the excellent conductivity ofrGO, rGO can rapidly transfer photo-generated carriers produced by Ag10Si4O13 to the surface after being combined with Ag10Si4O13; the combination problem of the photo-generated carriers can be overcome, the photocatalytic efficiency is improved, the photo-corrosion problem caused by the enrichment of photo-generated electrons on the surface of Ag10Si4O13 can be avoided, and the stability of the Ag10Si4O13 material is improved. The material can be well applied to photocatalytic degradation of pollutants.

Description

Technical field [0001] The present invention relates to the technical field of photocatalytic materials, in particular to an rGO / silver silicate composite material and a preparation method and application thereof. Background technique [0002] With the development of science and technology, while enjoying modern material civilization, human beings are also savoring the bitter fruits of environmental pollution. Among them, water pollution is an important problem. The discharge of sewage causes serious pollution to rivers and lakes, which will not only affect our production and life, but also cause serious harm to the ecological environment. The large amount of organic wastewater discharged from production and life leads to eutrophication of water bodies, causing rapid growth of algae and other plankton, reduction of dissolved oxygen in water bodies, deterioration of water quality, and massive deaths of fish and other organisms. Among many sewage treatment technologies, photocatal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/10C02F1/30B82Y30/00B82Y40/00
Inventor 李翠霞王慧康康伟超卢学峰杨晓永
Owner LANZHOU UNIVERSITY OF TECHNOLOGY