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Preparation and application of graphene oxide-bonded silica gel composite

A technology of bonding silica gel and composite materials, which is applied in applications, tobacco, e-liquid filter elements, etc., and can solve problems such as the influence of cigarette flavor and taste

Active Publication Date: 2015-04-08
SHANGHAI TOBACCO GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods have a great impact on the flavor and mouthfeel of cigarettes while reducing harmful substances such as tar release or nicotine content.

Method used

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  • Preparation and application of graphene oxide-bonded silica gel composite
  • Preparation and application of graphene oxide-bonded silica gel composite
  • Preparation and application of graphene oxide-bonded silica gel composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] 1. Preparation of GO

[0093] 10g graphite powder, 5gNaNO 3 Add 230ml of concentrated sulfuric acid into a large beaker with a volume of 2L, and stir at 0°C for 30 minutes to carry out pre-oxidation treatment. After pre-oxidation treatment, 30g of KMnO 4 This was added slowly, and the mixture was stirred at room temperature until it became a brown slurry. After stirring for 120 minutes, 500ml of deionized water was slowly added to the brown slurry, and the reaction temperature rose sharply at this time, and the stirring was continued for 120 minutes. Then add 1L of warm water and 100ml of 30% H 2 o 2 , stir evenly, centrifuge and filter. The sample obtained after filtration was washed twice with dilute hydrochloric acid, then twice with deionized water, and dried in a vacuum oven at room temperature to finally obtain GO powder.

[0094] 2. Preparation of GO / silica gel composites

[0095] Take 200mg of GO powder and disperse it into 500ml of N,N dimethylformamide....

Embodiment 2

[0099] 1. Preparation of GO

[0100] 10g graphite powder, 4.5gNaNO 3 and 210ml of concentrated sulfuric acid were added into a large beaker with a volume of 2L, and stirred at 0°C for 20 minutes for pre-oxidation treatment. After pre-oxidation treatment, 28g of KMnO 4 This was added slowly, and the mixture was stirred at room temperature until it became a brown slurry. After stirring for 110 minutes, 480ml of deionized water was slowly added to the brown slurry, and the reaction temperature rose sharply at this time, and the stirring was continued for 110 minutes. Then add 950ml of warm water and 95ml of 30% H 2 o 2 , stir evenly, centrifuge and filter. The sample obtained after filtration was washed twice with dilute hydrochloric acid, then twice with deionized water, and dried in a vacuum oven at room temperature to finally obtain GO powder.

[0101] 2. Preparation of GO / silica gel composites

[0102] Disperse 200mg of GO powder into 480ml of N,N dimethylformamide. Af...

Embodiment 3

[0106] 1. Preparation of GO

[0107] 10g graphite powder, 5.5gNaNO 3 Add 250ml of concentrated sulfuric acid into a large beaker with a volume of 2L, and stir at 5°C for 40 minutes to carry out pre-oxidation treatment. After pre-oxidation treatment, 32g of KMnO 4 This was added slowly, and the mixture was stirred at room temperature until it became a brown slurry. After stirring for 130 minutes, 520ml of deionized water was slowly added to the brown slurry, and the reaction temperature rose sharply at this time, and stirring was continued for 130 minutes. Then add 1L of warm water and 105ml of 30% H 2 o 2 , stir evenly, centrifuge and filter. The sample obtained after filtration was washed twice with dilute hydrochloric acid, then twice with deionized water, and dried in a vacuum oven at room temperature to finally obtain GO powder.

[0108] 2. Preparation of GO / silica gel composites

[0109] Take 200mg of GO powder and disperse it into 520ml of N,N dimethylformamide. A...

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Abstract

The invention provides a reparation method for a graphene oxide-bonded silica gel composite, which includes the following steps: (1) sodium nitrate and concentrated sulfuric acid are added into graphite powder for pre-oxidation treatment, potassium permanganate is added into the mixture and agitated, water is added for dilution, agitation is then continued, warm water and hydrogen peroxide are added into the mixture, uniformly agitated, centrifuged and filtered, and finally, after cleaning and drying, graphene oxide powder is produced; (2) the graphene oxide powder is added into N, N dimethylformamide and ultrasonically dispersed, amino silica gel and dicyclohexylcarbodiimide are added into the mixture and heated for reflux, and after centrifugation, filtration, cleaning and drying, the graphene oxide-bonded silica gel composite is produced. The invention also further provides a cigarette filter into which the graphene oxide-bonded silica gel composite is added. The graphene oxide-bonded silica gel composite provided by the invention can effectively reduce the content of TSNAs in the mainstream smoke of cigarettes, and has an excellent effect.

Description

technical field [0001] The invention belongs to the technical field of cigarette materials, and relates to the preparation and application of functional materials in the field of cigarettes, in particular to the preparation of a graphene oxide bonded silica gel composite material and its addition to cigarette filter rods to reduce cigarette mainstream smoke Application of nitrosamines. Background technique [0002] During the burning process of cigarettes, cancer-promoting and carcinogenic substances will be produced, such as fused-ring aromatic hydrocarbons, phenols, tobacco-specific nitrosamines (TSNAs) and free radicals. Among them, tobacco-specific nitrosamines (TSNAs) have been reported, and 8 species have been identified so far. However, there are four main types in cigarettes: N-nitrosonornicotine (NNN), 4-(methylnitrosamine)-1-(3-pyridyl)-1-butanone (NNK), N - Nitrosoanatabine (NAT), N-nitrosoanabatin (NAB). Among them, NNN and NNK have been proved to be carcinoge...

Claims

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Application Information

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IPC IPC(8): A24D3/04
CPCA24D3/14
Inventor 石睿徐同广严莉红张杰王巍巍刘冬烨周骏
Owner SHANGHAI TOBACCO GRP CO LTD
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