CN200948409Y - Air purifier based on titanium dioxide/activated carbon fiber photocatalyst - Google Patents

Abstract

The utility model discloses an air purifier based on TiO2/activated carbon fiber photocatalyst, comprising a housing with a wind grid, an air purification room and a fan. The wind grid (namely an air inlet) is arranged at the front of the air purification room; a photocatalyst layer and an ultraviolet light are arranged in the air purification room; the photocatalyst layer is made of TiO2/ACF; the fan is arranged at the rear of the air purification room. The purifier can simultaneously perform both absorption function and photocatalytic degradation function to the harmful organic pollutants, improving the photocatalytic efficiency. Moreover, the utility model has the advantages of long service life and low cost.

Description

Air purifier based on titanium dioxide/activated carbon fiber photocatalyst

Technical field

The utility model belongs to the technical field of air purification, in particular to an air purifier capable of absorbing, enriching and photocatalytically degrading volatile organic compounds in the air at the same time.

Background technique

The U.S. Environmental Protection Agency (USEPA) studies the exposure of the human body to air pollutants and shows that the pollution level of most organic pollutants in the indoor environment is 2 to 5 times that of the outdoors, and sometimes even as high as 100 times; On average, 80-90% of the time is spent indoors, and people have higher exposure concentration levels indoors. Therefore, indoor air quality is more closely related to human health and is more concerned by people. The main trace pollutants in indoor air include volatile organic compounds such as benzene series, formaldehyde, and halogenated hydrocarbons. Most of the pollutants mentioned above have great chemical toxicity and "three effects", causing potential harm to human health. Therefore, the removal of volatile organic compounds in indoor air is of great significance.

At present, the purification technologies of VOCs (volatile organic compounds) in indoor air mainly include ventilation method, filtration method, and adsorption method. None of the above methods has the functions of organic pollutant degradation and detoxification, and has certain limitations. Bring secondary pollution. However, photocatalytic degradation technology has outstanding advantages in this respect. However, when the indoor VOCs concentration is low, the adsorption performance of _TiO2 photocatalyst is relatively poor, and the concentration of organic pollutants in the air is often relatively low, so it is difficult to effectively enrich the surface of _TiO2 , which greatly affects the effect of TiO2 photocatalyst on the surface of _TiO2 . The photocatalytic efficiency of low-concentration volatile organic compounds indoors and outdoors leads to low photocatalytic degradation efficiency, and cannot effectively achieve the degradation and detoxification of low-concentration volatile organic compounds.

Activated carbon fiber (ACF) is a high-quality carbon adsorption material. Its specific surface area is several times that of granular activated carbon. It can adsorb and treat low-concentration organic waste gas, thereby effectively adsorbing low-concentration or even trace organic pollution. thing. However, as an adsorbent, activated carbon fiber has the problem that it must be regenerated with other activated carbon materials to restore its adsorption capacity after reaching saturated adsorption. Moreover, the regeneration technology of activated carbon materials has the disadvantages of complex regeneration equipment, high operating costs, and secondary pollution.

TiO ₂ /ACF (titanium dioxide/activated carbon fiber) photocatalyst can oxidize harmful gases into carbon dioxide and water, and has antibacterial and sterilizing effects. It is non-toxic to the human body, does not need to be replaced and regenerated, and has broad development prospects in air purification. But also do not see the report of relevant air purifier at present.

Contents of the invention

In order to solve the deficiencies in the above-mentioned prior art, the purpose of this utility model is to provide an air purifier based on titanium dioxide/activated carbon fiber photocatalyst. The air purifier can effectively absorb and enrich, and simultaneously in-situ photocatalytically degrade and detoxify the volatile organic compounds in the air, and has high treatment efficiency and low photocatalyst regeneration cost.

The purpose of this utility model is achieved through the following technical solutions: the air purifier includes a housing with an air grid, an air cleaning room, and a fan, and it is characterized in that the front of the air cleaning room is provided with an air grid. The air port is provided with a photocatalyst layer and an ultraviolet lamp in the inside of the air cleaning chamber; the photocatalyst layer is TiO ₂ /ACF (titanium dioxide/activated carbon fiber) photocatalyst layer (that is, adopts TiO ₂ loaded on ACF to make), A fan is installed at the rear of the air cleaning room.

In order to better realize the utility model, an air purification filter screen is installed on the inner wall of the air grid, which is used to filter larger particles and fibers in the air entering the clean room; in order to meet the air requirements of different pollution levels, Inside the clean room, 1 to 6 photocatalyst layers can be arranged. The photocatalyst layer and the ultraviolet lamp are arranged in parallel, and an ultraviolet lamp is arranged between every two photocatalyst layers, and the ultraviolet lamp is arranged at half the height of the photocatalyst layer, and the distance between the ultraviolet lamp and the photocatalyst layer is 2 to 5 cm , the photocatalyst layer is supported by a metal mesh. Such an ingenious design allows the volatile organic pollutants in the air to be continuously adsorbed on the TiO ₂ /ACF photocatalyst layer with a large specific surface area during the cyclic reaction process, effectively increasing the actual separation between volatile organic compounds and the photocatalyst layer. The contact increases the adsorption amount of volatile organic pollutants on the catalyst surface and increases the concentration of volatile organic pollutants on TiO ₂ , which can effectively improve the efficiency of photocatalytic degradation of low-concentration volatile organic pollutants.

The principle of the utility model is as follows: the air purifier adopts ACF (activated carbon fiber, activated carbon fiber including activated carbon fiber cloth or activated carbon fiber felt) as a carrier to load TiO ₂ (titanium dioxide) The organic pollutants are quickly adsorbed to achieve the enrichment of volatile organic pollutants on the carrier ACF, and then the in-situ photocatalytic reaction is carried out on the surface of the TiO ₂ catalyst loaded on the ACF, so that the low concentration of volatile organic pollutants The effective photocatalytic reaction, until it is completely converted into harmless carbon dioxide, water, and simple inorganic substances, enables the continuous in-situ regeneration of ACF, which is highly efficient and has no secondary pollution.

Compared with the prior art, the utility model has the following advantages and beneficial effects: the purifier has the function of adsorption and removal and photocatalytic degradation of poisonous organic pollutants at the same time, and the photocatalytic efficiency of _TiO2 will be greatly increased after super-acidification treatment , more importantly, the TiO ₂ catalyst loaded on the ACF enables the low-concentration organic pollutants enriched on the ACF to undergo an effective photocatalytic reaction, so that the saturated ACF can be regenerated in situ, and a cyclic adsorption occurs, thus The surface concentration of the catalyst is enriched, thereby effectively improving the photocatalytic efficiency. Therefore, the TiO ₂ /ACF photocatalyst has a strong in-situ regeneration ability, and the service life is prolonged and the cost is reduced.

Description of drawings

Fig. 1 is the air purifier of the present utility model;

Fig. 2 is a kinetic diagram of photocatalytic degradation of benzene by TiO ₂ /ACF (activated carbon fiber cloth).

Detailed ways

The utility model will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation of the utility model is not limited thereto.

Example 1

As shown in Figure 1, the air purifier of the present utility model comprises the casing 1 that has air grille, air cleaning room, blower fan 6. The air grille 2 is set in front of the clean room as the air inlet, and an air purification filter 3 is installed on the inner wall of the air grill to filter larger particles and fibers in the air entering the clean room. Photocatalyst layer 4 and ultraviolet lamp 5, photocatalyst layer 4 and ultraviolet lamp 5 are arranged in parallel, and photocatalyst layer is TiO ₂ /ACF (titanium dioxide/activated carbon fiber) photocatalyst layer (promptly adopts _TiO Loaded on ACF to make), the The photocatalyst layer is supported by a metal mesh, a fan 6 is installed at the rear of the clean room, and the air grill 7 on the casing 1 is an air outlet.

In the air purification room, 1 to 6 layers of photocatalyst layers can be arranged; an ultraviolet lamp is arranged between every two layers of photocatalyst layers, and the ultraviolet lamp is arranged at half the height of the photocatalyst layer. The distance between layers is 2-5cm.

Example 2

As shown in Figure 1, the technological process in the air purifier of the present invention is as follows: the fan at the rear of the air purification chamber sucks the air into the purification chamber through the air grid (air inlet), and the larger particles in the air are installed on the inner wall of the air grid. The air purification filter is filtered and removed, and three layers of highly adsorbable TiO ₂ /ACF (activated carbon fiber cloth) photocatalyst layers are set inside the clean room, and volatile organic pollutants in the air are adsorbed on the TiO ₂ /ACF photocatalyst layer , the TiO ₂ /ACF photocatalyst layer is supported by a metal mesh, and an ultraviolet lamp is set in the middle of every two TiO ₂ /ACF photocatalyst layers. Under the irradiation of ultraviolet light, the pollutants adsorbed on the TiO ₂ /ACF photocatalyst layer Perform photocatalytic degradation into non-toxic substances (carbon dioxide, water and simple inorganic substances), and the purified air is directly discharged through the air outlet.

Figure 2 presents the kinetic curves of the photocatalytic degradation of benzene using an air purifier based on titanium dioxide/activated carbon fiber photocatalyst. It can be seen from Figure 2 that the TiO ₂ /ACF photocatalyst has a high photocatalytic removal efficiency for benzene. In the early stage of the reaction, the concentration of benzene decreased relatively quickly, and gradually became more peaceful in the late stage of the reaction. This may be due to the photocatalytic degradation of benzene pre-adsorbed on ACF by _TiO2 at the beginning, so that the adsorption capacity of ACF can be regenerated, and the regenerated ACF continues to adsorb new benzene. At this time, adsorption and photocatalysis are carried out simultaneously. The rate of adsorption on ACF and photocatalytic degradation on the TiO ₂ surface reached a balance, and the degradation rate also reached the maximum value, and the adsorption and photocatalytic reaction were continuously cycled, and the degradation curve became relatively flat at this time. With the increase of reaction time, the removal rate of benzene increased obviously, and when the reaction time reached 120 minutes, the degradation rate reached 88.9%. It can be seen that the photocatalyst has very good removal efficiency for volatile organic compounds represented by benzene. This shows that ACF is used as a carrier to load _TiO2 catalyst, and the low-concentration organic pollutants in indoor air can be quickly adsorbed by using the adsorption performance of ACF, while the pollutants adsorbed on the surface of ACF are transferred to the surface of _TiO2 photocatalyst through surface migration and other ways. The photocatalytic degradation reaction makes the ACF regenerate in situ, that is, the TiO ₂ on the TiO ₂ /ACF photocatalyst has the ability to regenerate the ACF in situ.

Claims (8)

1, a kind of air purifier based on titanium dioxide/active carbon fiber photocatalyst, described air purifier comprises shell, air purifying room, the blower fan that has air grid, it is characterized in that, the front of described air purifying room is provided with air grid and is air inlet, is provided with photocatalyst layer and uviol lamp in the inside of air purifying room; Described photocatalyst layer is TiO ₂/ ACF photocatalyst layer, blower fan is equipped with at the air purifying room rear portion.

2, air purifier according to claim 1 is characterized in that, the air cleaning filter screen is installed on the inwall of described air grid.

3, air purifier according to claim 1 is characterized in that, the inside of described clean room is provided with 1～6 layer of photocatalyst layer.

4, air purifier according to claim 3 is characterized in that, between described photocatalyst layer is whenever two-layer a uviol lamp is set.

5, air purifier according to claim 1 is characterized in that, described photocatalyst layer and uviol lamp be arranged in parallel.

6, air purifier according to claim 1 is characterized in that, described uviol lamp is arranged on half high distance of photocatalyst layer.

7, air purifier according to claim 1 is characterized in that, described uviol lamp and photochemical catalyst interlamellar spacing are from being 2～5cm.

8, air purifier according to claim 1 is characterized in that, described photocatalyst layer supports with wire netting.

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