CN105688660A - Air purification material based on titanium dioxide photocatalyst and preparation method thereof - Google Patents

Abstract

The invention discloses an air purification material taking titanium dioxide photocatalyst as a base material and a preparation method thereof, wherein the air purification material comprises the following raw materials in percentage by mass: 30-40% of nano titanium dioxide, 20-35% of nano diatomite, 2-5% of vitamin C, 15-20% of tourmaline, 5-10% of tea crystal, 1-5% of binder and 0.5-1.5% of dispersant. When in preparation, all the components are uniformly mixed according to the proportion; putting the uniformly mixed materials into a heating kettle with a stirring device for mixing reaction; injecting into a forming die for granulation and shaping; sieving; the resulting granules were dried. The purifying material of the invention can play a role in purifying air under the irradiation of a light source by adding the nano material without a specific light source; meanwhile, the specific surface area is large and uniform, harmful substances in the air can be effectively adsorbed and decomposed, the sterilization, deodorization and odor inhibition effects are achieved, and the air purifier can be widely applied to indoor and in-vehicle closed environments and the like.

Description

Air purification material based on titanium dioxide photocatalyst and preparation method thereof

technical field

The invention relates to an air purification material, in particular to an air purification material with a titanium dioxide photocatalyst as a base material and a preparation method thereof, belonging to the fields of material science and environmental science.

Background technique

With the development of society and economic progress, people are paying more and more attention to environmental pollution, especially air pollution. However, for most people, regardless of work, study or life, most of their time is spent indoors or in closed environments such as cars. Although the harm of environmental pollution to human health has long been recognized by people, people's attention has gradually shifted to the harm of indoor air pollution to human health until the middle of the 20th century. There are many types of indoor air pollution, a wide range of pollution sources, and complex influencing factors. The harm to human health is often more serious than outdoor air pollution. Indoor air quality research has become a new focus in the field of material science and environmental science.

At present, the treatment methods for air pollution mainly include adsorption technology, photocatalysis technology, low temperature plasma technology and catalytic oxidation technology.

Adsorption technology is currently the most widely used air purification technology. Adsorption technology mainly uses high specific surface materials such as activated carbon and molecular sieves to adsorb VOC components such as formaldehyde, benzene and toluene. However, the existing adsorption materials have limited adsorption capacity, short duration, cannot be reused, and are prone to secondary pollution to the environment.

Photocatalytic technology mainly uses nano-titanium dioxide as a photocatalyst. Through the action of active hydroxyl radicals and superoxide radicals, formaldehyde can be decomposed at room temperature. Under ultraviolet light, titanium dioxide can catalyze a wide variety of harmful substances in the room. Oxidation, but it has the same problems of catalyst deactivation and the need for a specific light source, and the reaction rate needs to be improved.

Low temperature plasma technology is to contain electrons, ions, oxygen active species and excited state molecules and other species with extremely high chemical activity in the low temperature plasma generated by air discharge under normal pressure, so that many chemical reactions with high activation energy can occur. So as to achieve the purpose of dealing with organic pollutants in the indoor air. However, this technology is prone to produce secondary pollutants such as nitrogen oxides and ozone during the discharge process to the air.

Thermal catalytic oxidation technology uses a catalyst to decompose formaldehyde into harmless water and carbon dioxide at a relatively low temperature. It is also a promising method for purifying formaldehyde. However, the operating temperature of the catalyst used to catalyze the oxidation of formaldehyde is usually much higher than room temperature, and it is difficult to meet the requirements of normal temperature and pressure and low energy consumption required for indoor air purification.

Contents of the invention

The purpose of the present invention is to provide an air purification material with mild reaction conditions, low energy consumption, high efficiency, no secondary pollution and easy processing and a preparation method thereof for the deficiencies of the prior art.

The invention develops a material capable of completely oxidizing formaldehyde into water and carbon dioxide at room temperature and normal pressure, and realizes the practical application of catalytic oxidation technology in indoor air formaldehyde purification.

To achieve the above object, the technical solution provided by the present invention is:

The air purification material based on titanium dioxide photocatalyst is characterized in that, in terms of mass percentage, its raw material consists of:

Nano Titanium Dioxide 30‐40%

Nano Diatomaceous Earth 20‐35%

Vitamin C2‐5%

Tourmaline 15‐20%

Citrine 5‐10%

Binder 1‐5%

Dispersant 0.5‐1.5%;

The dispersant is at least one of aliphatic amides and stearic acid.

To further realize the purpose of the present invention, preferably, the vitamin C is common edible vitamin C.

Preferably, the tourmaline is industrial first-grade tourmaline.

Preferably, the adhesive is plexiglass glue.

A kind of preparation method that is the air purification material of base material with titanium dioxide photocatalyst, comprises the following steps:

(1) mix each component according to the proportion;

(2) Put the uniformly mixed material into a heating kettle with a stirring device and mix it at a temperature of 200-300°C;

(3) Pelletizing and finalizing in injection molding mould;

(4) sieving;

(5) The obtained granules are dried.

Preferably, the mixing reaction time of step (2) is 1-2 hours.

Preferably, the sieving is through a 50-100 mesh sieve.

Preferably, the drying is hot air drying, in terms of mass percentage, until the moisture content of the product is <0.5%.

Invention principle of the present invention: the raw materials of the present invention cooperate to realize air purification. Among them, nano-titanium dioxide, as a photocatalyst, can decompose formaldehyde under the condition of light source through the action of active hydroxyl radicals and superoxide radicals; the main component of nano-scale diatomite is silicic acid, and there are countless pores on the surface. It can absorb, expand, and decompose pollutants in the air, and has the functions of humidity control and deodorization; vitamin C is a small molecular weight hydroxyl compound, which is easy to generate free radicals under the irradiation of light sources. Hydroxyl free radicals in nano-titanium dioxide decompose and purify harmful gases such as formaldehyde and hydrogen sulfide; tea crystal is a natural plant essence, which is taken from natural tea leaves and has no toxic side effects. Citrine contains a large amount of phenolic hydroxyl (OH) compounds (polyphenolic compounds), which can use the H in the hydroxyl group to have a reduction and decomposition effect, and exchange additional complexes such as NH ₃ and SH in the odor components with H. cooperation. When formaldehyde, benzene, bacteria, etc. in the air are captured by tea crystals, the natural plant essence contained in tea crystals can catalyze and decompose them in a very short time to prevent secondary pollution. Among them, the polyphenolic compounds in tea crystals can promote the reduction of hydroxyl radicals in nano-titanium dioxide, and they also have the ability to reduce, so they can more efficiently decompose harmful gases in the air, such as: formaldehyde and hydrogen sulfide; at the same time, polyphenols Such compounds can promote the silicate minerals of tourmaline to emit far-infrared rays by their own reduction, produce negative ions, and regulate human body functions.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1) The products prepared by the present invention can well purify the harmful substances formaldehyde, benzene, toluene and TVOC in the air. After 1 hour of application, the volume concentration of formaldehyde in the air is lower than 0.023PPM, which is far lower than that of activated carbon purification. 1.32PPM of materials and 0.21PPM of commercially available nano-photocatalytic materials; the volume concentration of TVOC in the air is lower than 0.81PPM, far lower than 12.16PPM of activated carbon purification materials and 3.35PPM of commercially available nano-photocatalytic materials; The volume concentration of benzene in the medium is lower than 0.09PPM, which is lower than 1.67PPM of activated carbon purification materials and 0.13PPM of commercially available nano photocatalytic materials; the volume concentration of toluene in the air is lower than 0.07PPM, which is lower than 1.85PPM of activated carbon purification materials. PPM and 0.15PPM of commercially available nano-photocatalytic materials; generally speaking, the air purification and purification effect of the product of the present invention is obviously better than that of the same type of products on the market, and the purification effect is excellent.

2) The nano-titanium dioxide of the present invention is a photocatalyst-type catalyst, which can undergo a catalytic reaction under natural light irradiation without a specific light source; it has the characteristics of mild reaction conditions and low energy consumption.

3) Tourmaline is a silicate mineral with a ring structure of aluminum, sodium, iron, magnesium, and lithium, which is characterized by boron. It emits far-infrared rays to produce photosynthesis, and can generate negative ions in the air to regulate human body functions; vitamin C is Commercially available edible vitamin C; tea crystals are commercially available products; nano-titanium dioxide, nano-scale diatomaceous earth, binders and dispersants are all general-purpose products, with a wide range of raw material sources and economic benefits.

Description of drawings

Fig. 1 is a diagram of TVOC purification according to an embodiment of the present invention.

Fig. 2 is a diagram of the purification of formaldehyde in the embodiment of the present invention.

Figure 3 is a diagram of the purification of benzene in the embodiment of the present invention.

Fig. 4 is a diagram of toluene purification in an embodiment of the present invention.

detailed description

In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.

Example 1

An air purification material based on titanium dioxide photocatalyst, which is composed of the following raw materials in mass percentage: nano titanium dioxide 38%, nano diatomite 30%, vitamin C 4%, tourmaline 18%, tea crystal 5%, bonding Agent 4%, dispersant 1%.

The nano-titanium dioxide is selected from the nano-titanium dioxide (EFUT-N01-W) produced by Shanghai Eve Industrial Co., Ltd.;

The source of nano-diatomite raw material is the second-grade soil in Changbai County, Jilin Province; the nano-diatomite has a small particle size and a large specific surface area, which is easy to absorb impurities and odors.

Vitamin C is commercially available edible vitamin C, is the vitamin C of Yunnan Baiyao Group Co., Ltd.;

Tourmaline is nano-scale tourmaline powder from Baifei Mineral Products Processing Factory in Lingshou County;

Citrine is a commercially available product;

The adhesive is plexiglass glue 260# from Dongguan Jiabao Glue Products Factory;

The dispersant was erucamide ER‐211 from Croda Co., Ltd., UK.

A kind of preparation method that is the air purification material of base material with titanium dioxide photocatalyst, comprises the following steps:

1) Mix the components evenly according to the formula;

2) Put the homogeneously mixed materials into a heating kettle with a stirring device for further mixing and reaction; the temperature is 250° C., and the time is 1 hour.

3) Pelletizing and finalizing in injection molding mould;

4) Pass through a 50-mesh sieve;

5) The prepared granules are dried with hot air, and the moisture content is <0.5%. Get non-toxic, granular air cleaning materials.

The material obtained in this example is granular and can be placed anywhere in the room. It can be installed in a box and placed in an indoor environment, or it can be placed in a filter plate and installed in a purifier for air purification.

Example 2

An air purification material based on titanium dioxide photocatalyst, which is composed of the following raw materials in mass percentage: nano titanium dioxide 36%, nano diatomite 32%, vitamin C 4%, tourmaline 16%, tea crystal 7%, bonding Agent 4%, dispersant 1%.

Nano titanium dioxide is the photocatalyst titanium dioxide dispersion liquid of Shanghai Jianghu Industrial Co., Ltd.

The source of nano-diatomite raw material is the second-grade soil in Changbai County, Jilin Province; the nano-diatomite has a small particle size and a large specific surface area, which is easy to absorb impurities and odors.

Vitamin C is commercially available edible vitamin C;

Tourmaline is nano-scale tourmaline powder from Baifei Mineral Products Processing Factory in Lingshou County;

Citrine is a commercially available product;

The binder is plexiglass glue; the dispersant is stearic acid.

The preparation method of air purification material, it comprises the following steps:

A kind of preparation method that is the air purification material of base material with titanium dioxide photocatalyst, comprises the following steps:

1) Mix the components evenly according to the formula;

2) Put the homogeneously mixed materials into a heating kettle with a stirring device for further mixing and reaction; the temperature is 220° C., and the time is 2 hours.

3) Pelletizing and finalizing in injection molding mould;

4) Pass through a 100-mesh sieve;

5) The prepared granules are dried with hot air, and the moisture content is <0.5%. Get non-toxic, granular air cleaning materials.

Example 3

An air purification material based on titanium dioxide photocatalyst, which is composed of the following raw materials in mass percentage: nano titanium dioxide 33%, nano diatomite 32%, vitamin C 3%, tourmaline 18%, tea crystal 10%, bonding Agent 3%, dispersant 1%.

Nano-titanium dioxide is the photocatalyst nano-titanium dioxide produced by Chongqing Meigui Environmental Protection Technology Co., Ltd.

The source of nano-diatomite raw material is the second-grade soil in Changbai County, Jilin Province; the nano-diatomite has a small particle size and a large specific surface area, which is easy to absorb impurities and odors.

Vitamin C is commercially available edible vitamin C;

Tourmaline is nano-scale tourmaline powder from Baifei Mineral Products Processing Factory in Lingshou County;

Citrine is a commercially available product;

The binder is plexiglass glue; the dispersant is vinyl bis stearamide.

A kind of preparation method that is the air purification material of base material with titanium dioxide photocatalyst, comprises the following steps:

1) Mix the components evenly according to the formula;

2) Put the homogeneously mixed materials into a heating kettle with a stirring device for further mixing and reaction; the temperature is 280° C., and the time is 1 hour.

3) Pelletizing and finalizing in injection molding mould;

4) Pass through a 60-mesh sieve;

5) The prepared granules are dried with hot air, and the moisture content is <0.5%. Get non-toxic, granular air cleaning materials.

The product of the present invention that embodiment ^1-3 is made is placed in the closed space of 20m and is tested, and obtained result is as follows table 1:

Table 1

In Table 1, market air purification material 1 (activated carbon) is the activated carbon purification material of Guangdong Guangsen Carbon Technology Co., Ltd. Market air purification material 2 (nano-photocatalytic materials) is the activated carbon purification material of Guangzhou Keli Environmental Protection Technology Co., Ltd.

In Figure 1-4 and Table 1, formaldehyde, TVOC, benzene and toluene are the relevant data obtained by detecting formaldehyde electron detector, TVOC electron detector, benzene and toluene electron detector every 10 minutes. As can be seen from Figures 1-4 and Table 1, the products made by Examples 1-3 of the present invention can well purify the harmful substances formaldehyde, benzene, toluene and TVOC in the air. After 1 hour of application, the formaldehyde in the air The volume concentration is lower than 0.023PPM, far lower than 1.32PPM of activated carbon purification materials and 0.21PPM of commercially available nano photocatalytic materials; TVOC (Total Volatile Organic Compounds) refers to the saturated vapor pressure at room temperature exceeds 133.32pa Organic matter, whose boiling point is between 50°C and 250°C, exists in the air in the form of evaporation at room temperature. Its toxicity, irritation, carcinogenicity and special odor will affect the skin and mucous membranes and cause acute damage to the human body. The World Health Organization (WHO), the National Academy of Sciences/National Research Council (NAS/NRC) and other institutions have always emphasized that TVOC is an important class of air pollutants. After testing, the volume concentration of TVOC in the air of the present invention is lower than 0.81PPM, far lower than 12.16PPM of activated carbon purification materials and 3.35PPM of commercially available nano photocatalytic materials. After 1 hour of application, the volume concentration of benzene in the air is lower than 0.09PPM, which is lower than 1.67PPM of activated carbon purification materials and 0.13PPM of commercially available nano photocatalytic materials; after 1 hour of application, the volume concentration of toluene in the air is lower than 0.07PPM, which is lower than 1.85PPM of activated carbon purification materials and 0.15PPM of commercially available nano-photocatalytic materials; generally speaking, the air purification effect of the product of the present invention is obviously better than that of the same type of products on the market, and the purification effect excellent.

Claims (8)

1. The air purification material based on titanium dioxide photocatalyst is characterized in that, in terms of mass percentage, its raw material consists of: Nano Titanium Dioxide 30‐40% Nano Diatomaceous Earth 20‐35% Vitamin C2‐5% Tourmaline 15‐20% Citrine 5‐10% Binder 1‐5% Dispersant 0.5‐1.5%; The dispersant is at least one of aliphatic amides and stearic acid. 2. The air purification material based on titanium dioxide photocatalyst according to claim 1, characterized in that: said vitamin C is common edible vitamin C. 3. The air purification material based on titanium dioxide photocatalyst according to claim 1, characterized in that: said tourmaline is an industrial first-grade tourmaline. 4. The air purification material based on titanium dioxide photocatalyst according to claim 1, characterized in that: the binder is plexiglass glue. 5. a kind of preparation method of the air purification material of base material with titanium dioxide photocatalyst described in any one in claim 1～4, it is characterized in that comprising the following steps: (1) mix each component according to the proportion; (2) Put the uniformly mixed material into a heating kettle with a stirring device and mix it at a temperature of 200-300°C; (3) Pelletizing and finalizing in injection molding mould; (4) sieving; (5) The obtained granules are dried. 6. the preparation method of the air purification material taking titanium dioxide photocatalyst as the base material according to claim 5, is characterized in that: the time of step (2) mixed reaction is 1-2 hours. 7. The method for preparing an air purification material based on titanium dioxide photocatalyst according to claim 5, characterized in that: the sieving is a 50-100 mesh sieve. 8 . The method for preparing an air purification material based on titanium dioxide photocatalyst according to claim 5 , characterized in that: the drying is hot air drying, and the product is dried until the moisture content of the product is <0.5% in mass percentage.