阅读说明：本技术 一种空气净化材料及其制备方法 (Air purification material and preparation method thereof ) 是由 高琴 于 2020-11-13 设计创作，主要内容包括：本发明公开了一种空气净化材料及其制备方法,其包括如下步骤：将细菌纤维素的水凝胶浸泡于去离子水中,随后压实去掉其中的水分；将聚丙烯腈加热溶解,静电纺丝制备得到聚丙烯腈纳米纤维,随后,将其分散于溶剂中；将氧化石墨烯超声分散于去离子水中,随后,加入细菌纤维素、聚丙烯腈纳米纤维置于水热搅拌釜中,水热反应一段时间,冷冻干燥,得到石墨烯-聚丙烯腈-细菌纤维素的气凝胶；将石墨烯-聚丙烯腈-细菌纤维素气凝胶加入去离子水中,随后加入Cr源,搅拌,加入钛酸四丁酯,混合后继续加入MnCl-2和高锰酸钾溶液,滴加一定的氨水溶液,加热到140-160℃下反应5-10h,得到石墨烯-聚丙烯腈-细菌纤维素气凝胶-Cr掺杂TiO-2-MnO-2的复合材料。(The invention discloses an air purification materialThe preparation method comprises the following steps: soaking hydrogel of bacterial cellulose in deionized water, and then compacting to remove water; heating and dissolving polyacrylonitrile, preparing polyacrylonitrile nano fiber by electrostatic spinning, and then dispersing the polyacrylonitrile nano fiber in a solvent; ultrasonically dispersing graphene oxide in deionized water, then adding bacterial cellulose and polyacrylonitrile nano-fiber, placing the mixture into a hydrothermal stirring kettle, carrying out hydrothermal reaction for a period of time, and carrying out freeze drying to obtain the graphene-polyacrylonitrile-bacterial cellulose aerogel; adding graphene-polyacrylonitrile-bacterial cellulose aerogel into deionized water, then adding a Cr source, stirring, adding tetrabutyl titanate, mixing, and continuously adding MnCl 2 And potassium permanganate solution are added dropwise, a certain amount of ammonia water solution is heated to 140- 2 ‑MnO 2 The composite material of (1).)

1. A preparation method of an air purification material comprises the following steps:

(1) soaking hydrogel of bacterial cellulose in deionized water, and then compacting to remove water;

(2) heating and dissolving polyacrylonitrile, preparing polyacrylonitrile nano fiber by electrostatic spinning, and then dispersing the polyacrylonitrile nano fiber in a solvent;

(3) ultrasonically dispersing graphene oxide in deionized water, then adding bacterial cellulose and polyacrylonitrile nano-fiber, stirring, transferring into a hydrothermal stirring kettle, carrying out hydrothermal reaction for a period of time, and then carrying out freeze drying to obtain the graphene-polyacrylonitrile-bacterial cellulose aerogel;

(4) adding graphene-polyacrylonitrile-bacterial cellulose aerogel into deionized water, then adding a Cr source, stirring, continuously adding tetrabutyl titanate, mixing, and continuously adding MnCl₂And potassium permanganate solution are added dropwise, a certain amount of ammonia water solution is heated to 140-₂-MnO₂The composite material of (1).

2. The method for preparing an air purification material according to claim 1, wherein the soaking time in the step (1) is 24-50 h; the compacting time is 12-24 h.

3. The method for preparing an air purifying material as claimed in claim 1, wherein the hydrothermal temperature in the step (1) is 180-220 ℃.

4. The method for preparing an air purification material as claimed in claim 1, wherein the ratio of the graphene-polyacrylonitrile-bacteria cellulose aerogel to the graphene-polyacrylonitrile-bacteria cellulose aerogel is 1 (1-5) to (1-5).

5. An air cleaning material, characterized in that it is prepared by the method of claims 1-5.

Technical Field

The invention relates to the technical field of environmental protection, in particular to an air purification material and a preparation method thereof.

Background

In recent years, with the rapid development of domestic urban industrialization, negative influence caused by ecological destruction is caused, air pollution is increasingly serious, air quality is continuously deteriorated, normal life of people is harmed, physical and mental health of people is harmed, and the requirement of people on air purification is higher and higher. Particularly, with the widespread use of interior finishing materials for buildings, various materials emit a large amount of harmful substances, such as: formaldehyde, toluene, benzene and other volatile organic pollutants seriously affect the indoor air quality; in addition, the air also contains heavy metal ion dust, toxic chemical substances, some infectious microbial viruses and the like, so people living in the environment for a long time can have symptoms such as headache, respiratory tract infection, fatigue, lethargy, fever, nausea and the like, and even can generate mutation, teratogenesis and carcinogenicity, seriously harm the health of the human body, reduce the life quality, influence the work efficiency and reduce the immunity of the human body. Therefore, in recent decades, the impact of indoor air quality on human health has become an increasing concern worldwide. Currently, there is a certain progress in the purification treatment of fine particulate pollutants and chemical pollution of gases in the air, and the current method can effectively remove the larger solid particles in the air, but has a weak effect on removing toxic and harmful gas pollutants, such as formaldehyde, and fine particulate matters in the air. Therefore, the development of a novel, efficient and low-cost air purification treatment material has high scientific value and practical value.

Disclosure of Invention

The invention aims to provide an efficient air purification material and a preparation method thereof, which have higher adsorptivity and higher speed for harmful gases and can effectively remove various harmful substances such as formaldehyde, benzene series, heavy metal particle dust and the like in the air.

A preparation method of an air purification material comprises the following steps:

(1) soaking hydrogel of bacterial cellulose in deionized water, and then compacting to remove water;

(2) heating and dissolving polyacrylonitrile, preparing polyacrylonitrile nano fiber by electrostatic spinning, and then dispersing the polyacrylonitrile nano fiber in a solvent;

(3) ultrasonically dispersing graphene oxide in deionized water, adding bacterial cellulose and polyacrylonitrile nano-fiber, uniformly stirring, placing in a hydrothermal stirring kettle, carrying out hydrothermal reaction for a period of time, and then carrying out freeze drying to obtain the graphene-polyacrylonitrile-bacterial cellulose aerogel;

(4) adding graphene-polyacrylonitrile-bacterial cellulose aerogel into deionized water, then adding a Cr source, stirring, adding tetrabutyl titanate, mixing, and continuously adding MnCl₂And potassium permanganate solution are added dropwise, a certain amount of ammonia water solution is heated to 140-₂-MnO₂The composite material of (1).

Preferably, the soaking time in the step 1 is 24-50 h; the compacting time is 12-24 h;

preferably, the hydrothermal temperature in the step 1 is 180-220 ℃;

preferably, the ratio of the graphene-polyacrylonitrile-bacterial cellulose aerogel to the graphene-polyacrylonitrile-bacterial cellulose aerogel is 1 (1-5) to (1-5);

the technical effects are as follows:

according to the invention, the gel is formed by compounding graphene, polyacrylonitrile and bacterial cellulose, so that the problem that the traditional graphene aerogel is unstable in structure and easy to collapse is solved, and the structural stability of the gel is improved; the compact three-dimensional micro-mesoporous framework structure formed by the synergistic cooperation of the three components has higher specific surface area and more pore structures, and greatly improves the adsorption effect on harmful substances in the air; by loading Cr-doped TiO on the surface of aerogel₂-MnO₂The heterojunction structure effectively promotes the reactivity, very big improvement catalytic efficiency.

Detailed Description

Example 1:

a preparation method of an air purification material comprises the following steps:

(1) soaking the hydrogel of the bacterial cellulose in deionized water for 20h, and then compacting for 20h to remove water;

(2) heating and dissolving polyacrylonitrile, preparing polyacrylonitrile nano fiber by electrostatic spinning, and then dispersing the polyacrylonitrile nano fiber in a solvent;

(3) ultrasonically dispersing graphene oxide in deionized water, then adding bacterial cellulose and polyacrylonitrile nano-fiber, stirring, putting the mixed solution into a hydrothermal stirring kettle at a ratio of 1:5:5, carrying out hydrothermal reaction for 10 hours at 180 ℃, and then freeze-drying to obtain the graphene-polyacrylonitrile-bacterial cellulose aerogel;

(4) adding graphene-polyacrylonitrile-bacterial cellulose aerogel to deionized water, followed by addition of Cr (NO)₃)₃Stirring, adding tetrabutyl titanate, mixing, and continuously adding MnCl₂Adding a certain amount of ammonia water solution dropwise into potassium permanganate solution, heating to 150 ℃ and reacting for 10 hours to obtain graphene-polyacrylonitrile-bacterial cellulose aerogel-Cr-doped TiO₂-MnO₂。

Example 2

A preparation method of an air purification material comprises the following steps:

(1) soaking hydrogel of bacterial cellulose in deionized water for 26h, and then compacting for 20h to remove water;

(2) heating and dissolving polyacrylonitrile, preparing polyacrylonitrile nano fiber by electrostatic spinning, and then dispersing the polyacrylonitrile nano fiber in a solvent;

(3) ultrasonically dispersing graphene oxide in deionized water, then adding bacterial cellulose and polyacrylonitrile nano-fiber, stirring, wherein the ratio of the graphene to the polyacrylonitrile to the bacterial cellulose aerogel is 1:3:3, placing the mixed solution in a hydrothermal stirring kettle, carrying out hydrothermal reaction at 180 ℃ for 10 hours, and then carrying out freeze drying to obtain the graphene to polyacrylonitrile to bacterial cellulose aerogel;

(4) adding graphene-polyacrylonitrile-bacterial cellulose aerogel for deionizationIn water, then adding Cr (NO)₃)₃Stirring, adding tetrabutyl titanate, mixing, and continuously adding MnCl₂Adding a certain amount of ammonia water solution dropwise into potassium permanganate solution, heating to 180 ℃ and reacting for 10 hours to obtain graphene-polyacrylonitrile-bacterial cellulose aerogel-Cr-doped TiO₂-MnO₂。

Example 3

A preparation method of an air purification material comprises the following steps:

(1) soaking the hydrogel of the bacterial cellulose in deionized water for 30h, and then compacting for 20h to remove water;

(2) heating and dissolving polyacrylonitrile, preparing polyacrylonitrile nano fiber by electrostatic spinning, and then dispersing the polyacrylonitrile nano fiber in a solvent;

(3) ultrasonically dispersing graphene oxide in deionized water, then adding bacterial cellulose and polyacrylonitrile nano-fiber, stirring, wherein the ratio of the graphene to the polyacrylonitrile to the bacterial cellulose aerogel is 1:2:2, placing the mixed solution in a hydrothermal stirring kettle, carrying out hydrothermal reaction at 180 ℃ for 18h, and then carrying out freeze drying to obtain the graphene to polyacrylonitrile to bacterial cellulose aerogel;

(4) adding graphene-polyacrylonitrile-bacterial cellulose aerogel to deionized water, followed by addition of Cr (NO)₃)₃Stirring, adding tetrabutyl titanate, mixing, and continuously adding MnCl₂Adding a certain amount of ammonia water solution dropwise into potassium permanganate solution, heating to 180 ℃ and reacting for 10 hours to obtain graphene-polyacrylonitrile-bacterial cellulose aerogel-Cr-doped TiO₂-MnO₂。

Test for degradation Properties

Initial concentrations of formaldehyde, toluene and nitrogen dioxide are all 100mg/l, the degradation performance of the composite materials of examples 1-3 on organic pollutants is tested under the condition of ultraviolet illumination, the residual concentrations of the pollutants are tested after 1h, and the degradation rates (calculated according to the percentage ratio) of the examples on different pollutants are calculated.

Examples	Toluene	Formaldehyde (I)	Benzene and its derivatives
				1	90.8	92.3	91.5
2	92.1	92.5	91.8
				3	91.3	90.6	90.7

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.