Graphene-based haze-resisting mask filtering material and preparation method thereof

A graphene-based, graphene-based technology, applied in separation methods, chemical instruments and methods, dispersed particle filtration, etc., can solve the problems of ineffective air filtration of adsorption materials, ineffective control of pore size, etc., to achieve good mechanical properties and processability, reduced energy consumption, and the effects of ultra-high specific surface area

CN104525107AInactive Publication Date: 2015-04-22杜茂龙
4 Cites 28 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-04-22
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a graphene-based haze-resisting mask filtering material and a preparation method thereof. The material has a three-dimensional graphene sponge structure assembled from graphene oxide. The method and an application comprises the following points: (1) cross-linking agents such as ascorbic acid are added into a graphene oxide water solution; with a hydrothermal reaction, graphene slices are subjected to self assembly, such that porous spongy three-dimensional graphene is obtained; (2) the porous spongy graphene has good mechanical strength, and can be cut into different shapes; (3) the structure of the graphene sponge can be regulated through changing the size of graphene oxide and the addition amount of the cross-linking agents; (4) the porous spongy graphene has high specific surface area and relatively high quantity of surface functional groups; and the porous spongy graphene has high absorption effect and certain bacteria resistance. The preparation process of the graphene absorption material has simple process and low cost. With the method, graphene sponge pore size can be regulated. The graphene sponge can be used as a mask filtering sheet which can effectively filter air pollutants such as PM2.5 particles, and can be used in the fields such as dye and oil dirt absorption.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of adsorption materials, in particular to a graphene adsorption material and its preparation method and application, which can be used as a mask filter to effectively filter air pollutants such as PM2.5, and has certain antibacterial properties. Background technique

[0002] In recent years, many large and medium-sized cities in China frequently produce smog weather, which seriously threatens people's health and lives. The mechanism of haze weather is very complicated, and its chemical composition is also very complicated, which may cause many diseases. At the same time, viruses, germs, etc. may attach to atmospheric particles and spread diseases. PM2.5 is the most harmful particulate matter among air pollutants. The diameter of this particulate matter is equal to or less than 2.5 microns, and it is medically regarded as inhalable particulate matter. Ordinary masks cannot filter PM2.5, and the various anti-smog mask...

Examples

Embodiment 1

[0028] The embodiment of the present invention prepares the technological process of three-dimensional graphene, comprises the following steps:

[0029] The first step is to prepare graphene oxide: the average particle size of graphite powder in this example is 10000 mesh. Graphene oxide (GO) was synthesized by the Hummers method. 2g graphite powder, 1g NaNO 3 Mix well with 230ml concentrated sulfuric acid in an ice-water bath, slowly add 6g KMnO 4 . Then the temperature was raised to 35°C, and after stirring for 30 minutes, 92ml of deionized water was added, and the temperature was raised to 98°C for 15 minutes to react. After that, add 280ml of water to it to dilute, and wash with 5ml of 30% H 2 o 2 Neutralize excess KMnO 4 . The color of the mixed solution was brownish yellow, filtered while hot, washed repeatedly with deionized water until neutral, and dispersed by ultrasonic to obtain GO.

[0030] The second step, hydrothermal synthesis of three-dimensional graphe...

Embodiment 2

[0035] The embodiment of the present invention prepares the technological process of three-dimensional graphene, comprises the following steps:

[0036] The first step is to prepare graphene oxide: the average particle size of graphite powder in this example is 15000 mesh. The synthesis steps are the same as in Example 1.

[0037] The second step, hydrothermal synthesis of three-dimensional graphene: take 200ml of graphene oxide solution with a mass fraction of 5mg / ml and pour it into a disc-shaped reaction vessel with a diameter of 25cm and a height of 2cm, add 0.5g of ascorbic acid (VC) and stir to make it fully Mix, then seal the reaction vessel tightly. Put the airtight reaction dish at 160°C for hydrothermal reaction for 6 hours, and the graphene oxide in the reaction dish spontaneously shrinks and cross-links to form a three-dimensional sponge structure. The graphene sponge was then freeze-dried to obtain a flexible three-dimensional graphene structure.

[0038] In summ...

Embodiment 3

[0041] The embodiment of the present invention prepares the technological process of three-dimensional graphene, comprises the following steps:

[0042] The first step is to prepare graphene oxide: the average particle size of graphite powder in this example is 10000 mesh. The synthesis steps are the same as in Example 1.

[0043] The second step, hydrothermal synthesis of three-dimensional graphene: take 200ml of graphene oxide solution with a mass fraction of 5mg / ml and pour it into a disc-shaped reaction vessel with a diameter of 25cm and a height of 2cm, add 0.2g of dopamine (DA) and stir to make it fully Mix, then seal the reaction vessel tightly. Put the airtight reaction dish at 120°C for hydrothermal reaction for 12 hours, and the graphene oxide in the reaction dish spontaneously shrinks and cross-links to form a three-dimensional sponge structure. Then freeze the graphene sponge and soak it in an ethanol solution, pour off the solution and let it dry naturally to ob...