rGO/silver silicate composite and preparation method and application thereof

A technology of composite materials and silicic acid sol, which is applied in the field of photocatalytic materials, can solve the problems of high recombination rate of photogenerated carriers, low utilization efficiency of visible light, and narrow light absorption range, so as to improve photocatalytic efficiency and avoid photocorrosion problems , the effect of uniform grain distribution

Inactive Publication Date: 2019-05-24
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • rGO/silver silicate composite and preparation method and application thereof
  • rGO/silver silicate composite and preparation method and application thereof
  • rGO/silver silicate composite and preparation method and application thereof

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preparation example Construction

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

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

[0032] (2) adding water dropwise to the mixed solution obtained in the step (1), and aging after stirring to obtain silicic acid sol;

[0033] (3) graphene hydrosol is mixed with silicic acid sol, obtains graphene-silicic acid sol;

[0034] (4) drip silver nitrate solution in the graphene-silicic acid sol that described step (3) obtains, carry out complexation reaction, dry after leaving standstill, obtain precursor;

[0035] (5) heat-treating the precursor obtained in step (4) to obtain GO / Ag 10 Si 4 o 13 Material;

[0036] (6) the GO / Ag obtained in the step (5) 10 Si 4 o 13 Material reduction treatment to obtain the rGO / Ag 10 Si 4 o 13 composite material.

[0037] The invention mixes citric acid, absolute ethanol and ethyl orthosili...

Embodiment 1

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

[0060] (2) Add 0.33mL of distilled water dropwise (dropping rate is 0.04mL / s) into the obtained mixed solution, stir for 1h, seal and store for 15 days to obtain silicic acid sol;

[0061] (3) Mix 4.394g of graphene sol (solid-to-liquid ratio is 0.003564) and 6.53mL of silicic acid sol, stir for 1h to make it evenly distributed, and then ultrasonicate for 6h to obtain graphene-silicate sol;

[0062] (4) 1.9g AgNO 3 Mix with 5mL of distilled water to obtain a silver nitrate solution; add the gained silver nitrate solution dropwise (a drop rate of 0.04mL / s) into the graphene-silicic acid sol, carry out complexation reaction for 2h under stirring conditions, and let it stand 12h, put it into a 100°C oven to dry and grind to obtain the precursor;

[0063] (5) The precursor was heat-t...

Embodiment 2

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

[0068] (2) Add 0.33mL of distilled water dropwise into the obtained mixed solution (the dropping rate is 0.04mL / s), stir for 1h, seal and age for 15 days to obtain silicic acid sol;

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

[0070] (4) 1.9g AgNO 3 Mix with 5mL of distilled water to obtain a silver nitrate solution; add the obtained silver nitrate solution dropwise (the drop rate is 0.04mL / s) to the obtained graphene-silicic acid sol, and carry out the complexation reaction for 2h under the condition of stirring, after standing for 12h , placed in a 100°C oven for drying and grinding to obtain the precursor; ...

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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 invention relates to the technical field of photocatalytic materials, in particular to an rGO / silver silicate composite material and its preparation method and application. Background technique [0002] With the development of science and technology, while enjoying modern material civilization, human beings are also suffering from 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. A large amount of organic wastewater discharged by people due to production and living causes eutrophication of the water body, causing the rapid reproduction of algae and other plankton, the decrease of dissolved oxygen in the water body, the deterioration of water quality, and the massive death of fish and other organisms. Among many sewage tre...

Claims

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Application Information

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Patent Type & Authority Applications(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
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