TWM584709U - Filtering material - Google Patents

Abstract

A filter material includes a substrate and a plurality of adsorption particles. A plurality of adsorption particles are distributed on the substrate, and the adsorption particles are made of calcined egg shell powder, and the adsorption particles have a multi-layered microporous crystal structure. With the adsorption particles made of eggshell, the biological calcium filter material provided by this creation can effectively filter out pathogenic sources (such as bacteria, mold and viruses), and further kill these pathogenic sources or inhibit the pathogenic sources. Grow. The adsorbed particles in the biological calcium filter material created by this creation can decompose the organic pollutants in the indoor air, thereby reducing the harm caused by the organic pollutants to the human body.

Description

Filter

This creation is related to the biological calcium filter material; in particular, it refers to a biological calcium filter material made of eggshell.

According to research, modern people spend an average of 80% to 90% of their time in indoor environments (including in homes, offices, or other buildings) every day. Therefore, the air quality of indoor environments will directly affect people's health. Among them, the air pollutants that affect indoor air quality can be roughly divided into granular pollutants, biological pollutants, volatile organic compounds and other gas pollutants.

In order to avoid the above-mentioned air pollutants from negatively affecting the human body for a long time, people use air purification equipment to filter air pollutants to improve indoor air quality. Generally, air cleaning equipment removes air pollutants by passing air through an air filter material (such as a HEPA filter). However, this type of traditional air filter material can filter out mold spores and larger pathogens at the same time, but cannot kill these molds and bacteria or inhibit the growth of molds and pathogens. As a result, these molds and diseases can breed on traditional air filters Cause secondary biological air pollution.

To sum up, the traditional air filter material is not perfect, and there is still room for improvement.

In view of this, the purpose of this creation is to provide a biological calcium filter material and a manufacturing method thereof, which can be used to filter out pathogenic sources (such as bacteria, mold and viruses), and further kill these pathogenic sources or inhibit the pathogenic sources. Grow. On the other hand, the bio-calcium filter material provided in this creation can decompose organic pollutants in indoor air, thereby reducing the harm caused by organic pollutants to the human body.

In order to achieve the above object, a biological calcium filter material provided in the present invention includes a filter body. The filter body includes a substrate and a plurality of adsorbed particles distributed on the substrate. The adsorbed particles are made of calcined eggshell powder, and the adsorbed particles have a multi-layered microporous crystal structure. .

In addition, this creation provides a method for manufacturing a biological calcium filter material, which at least includes the following steps: providing a plurality of eggshell powders; calcining the eggshell powders to obtain a plurality of adsorbed particles, and each of the adsorbed particles is a multilayered microparticle. A porous crystalline structure; and providing a substrate, and disposing the adsorbed particles on the substrate to form a biological calcium filter material.

The effect of this creation is that with the adsorption particles made of eggshell, the biological calcium filter material provided by this creation can effectively filter out pathogenic sources (such as bacteria, mold and viruses), and further kill these pathogenic sources Or inhibit the growth of pathogenic sources. On the other hand, the filter material in the biological calcium filter material provided in this creation can decompose the organic pollutants in the indoor air, thereby reducing the harm caused by the organic pollutants to the human body.

1a‧‧‧Biological calcium filter

10‧‧‧ Substrate

101‧‧‧ the first side

102‧‧‧ second side

20‧‧‧Filter material

201, 202‧‧‧ steps

D1‧‧‧ direction

FIG. 1A is a schematic structural diagram of a biological calcium filter material according to a preferred embodiment of the invention; FIG. 1B is a schematic structural diagram of a biological calcium filter material according to another preferred embodiment of the invention; FIG. 2 is a biological calcium filter material according to a preferred embodiment of the invention Flow chart of manufacturing method of filter material; Fig. 3 is a graph showing the change in the calcination recovery rate of the adsorbed microparticles in each of the creative examples; Fig. 4 is a scanning electron microscope (SEM) photograph of the adsorbed microparticles in each of the creative examples; Scanning spectrum of a powder diffraction device (XRD) for adsorbing particles in Example F; FIG. 5B is a scanning spectrum of a powder diffraction device (XRD) for adsorbing particles in Example G to Example K; FIG. 6 is each implementation of the creation FIG. 7 is a graph showing the change in the calcium content of the adsorbed particles according to the example; FIG. 7 is a graph showing the change in the pH value of the adsorbed particles according to each embodiment of the creative; FIG. 8 is an oxidation-reduction potential (ORP) value of the adsorbed particles according to each of the creative embodiments FIG. 9 is a line chart showing the change in the number of colonies of adsorbed microparticles in each of the creative examples.

In order to explain the creation more clearly, a preferred embodiment, embodiment A to embodiment K are described in detail below with reference to the drawings.

Referring to FIG. 1A, a biological calcium filter 1 a includes a substrate 10 and a plurality of adsorption particles 20. The adsorption particles 20 are distributed on the substrate 10, and the adsorption particles 20 are made of calcined egg shell powder, and the adsorption particles 20 have a multi-layered microporous crystal structure. In the present creative embodiment, the substrate has a first side 101 and a second side 102. A fluid can flow in from the first side 101 of the substrate 10 and then flow out from the second side 102; the adsorbed particles 20 It is distributed at least on the portion of the substrate 10 between the first side surface 101 and the second side surface 102 and through which the fluid can pass. In FIG. 1A, a fluid such as air (Or water) can enter the substrate 10 from the first side 101 of the substrate 10 according to the direction D1, and then flow out from the second side 102, and filter out the pollutants in the fluid through the adsorption particles 20.

Referring to FIG. 1B, the substrate 10 has a surface, and a fluid can pass away from the substrate 10 after passing through the surface; the adsorption particles 20 are distributed in a layered manner on the surface of the substrate 10. In FIG. 1B, the fluid includes air or water, and can pass through the surface of the substrate 10 away from the substrate 10 and filter out pollutants in the fluid through the adsorption particles 20.

In the present creative embodiment, the filter material 20 includes adsorbed particles made of an eggshell. In this creative embodiment, the adsorption particles are alkaline. In this creative embodiment, the pH of the adsorbed particles is greater than 12.

In this creative embodiment, the adsorbed particles include more than 94% of calcium oxide (CaO). In this creative example, the calcium content in the adsorbed particles is 650-750 mg / kg. In this creative embodiment, the adsorbed particles are calcined egg shell powder. In this creative embodiment, the calcined egg shell powder has a multi-layered microporous crystalline structure.

Please refer to FIG. 1 and FIG. 2 together. FIG. 2 is a flowchart of a method for manufacturing a biological calcium filter material 1a, 1b according to a preferred embodiment of the present invention, which includes the following steps: Step 201, providing egg shell powder; In step 202, the egg shell powder is calcined to obtain adsorption particles 20, and each of the adsorption particles 20 has a multi-layered microporous crystalline structure; and in step 203, a substrate 10 is provided, and the adsorption particles 20 are distributed on the substrate 10, To form biological calcium filter materials 1a, 1b.

In this creative embodiment, the adsorption particles are filled with nitrogen in a high temperature furnace and calcined the eggshell powders at a temperature of 800 degrees or more, and the amount of nitrogen gas is greater than 100 milliliters per minute. In another embodiment of the present invention, the adsorbed particles pass the eggshell through a temperature of 900 degrees or more. Calcined. In this creative embodiment, the calcination time of the egg shell is at least 1 hour. In another embodiment of the present invention, the calcining time of the egg shell is at least 2 hours.

The following experiments will be performed based on the calcination temperature and calcination duration, and the results will be analyzed: Experiment 1. Observe the changes before and after the calcined appearance and calculate the recovery rate; Experiment 2. Observe the calcined Microporous structure; Experiment three: Scanning and analyzing by crystal of powder diffraction device (XRD); Experiment four: Detection of calcium content; Experiment five: Detection of pH (pH); Experiment six: Redox potential (ORP); Experiment Seventh, sterilization experiment; and eighth, formaldehyde removal experiment.

Based on the experimental results of Experiments 1 to 6, the calcination temperature and calcination duration of the most economical and the best adsorption efficiency for producing the adsorbed particles of this creative embodiment can be summarized and analyzed. In addition, through the sterilization experiment of Experiment 7, it is possible to further verify the prevention and control effect of the adsorbed particles provided in the creative embodiment on biological pollution in indoor air pollution. It can be known from the results of the physical and chemical properties of the adsorbed particles produced by calcining the eggshell in this creative embodiment that the adsorbed particles provided in this creative embodiment can be used to improve indoor air quality and can be further applied to the development of green building materials.

Eggshell is a kind of highly bound biological calcium. Its structure is a substrate composed of protein fibers and an inorganic crystal on the protein. In detail, the composition of the eggshell is a porous substance mainly composed of inorganic substances. The total number of pores is about 6000 to 8000. Among the inorganic substances, there are about 94% to 98% calcium carbonate, 0.8% magnesium carbonate, and 0.7% calcium phosphate. And has a small amount of sulfur With iron. In addition to inorganic substances, eggshells also contain glycoproteins and polysaccharides, and the rest are water.

Before the eggshell is not calcined, the main component is calcium carbonate CaCO3 (about 94% w / w). The calcination reaction starts at 600 ° C ~ 700 ° C, and the calcination is completed when the temperature reaches 800 ° C ~ 900 ° C. At this time, the main component in the eggshell is calcium oxide CaO (about 95.91% w / w), and the secondary component is magnesium oxide MgO ( About 1.5% w / w) and carbon C (about 2.5% w / w). The eggshell structure before calcination is generally irregular shale flaky crystalline structure with extremely fine pores. The structure after calcination produces smaller pores due to the escape of carbon dioxide and CO2. After the egg shell is calcined, small grains are sintered to form large grains, and the large grains aggregate into an interconnected skeleton structure, which results in the generation of multiple pores.

In this creative embodiment, the raw eggshell powder is calcined in a JH-2 high-temperature furnace manufactured by GAU JIE. The high-temperature furnace is composed of high-temperature resistant gypsum board, and the temperature difference within the furnace is within ± 0.5 ° C. In the above experiment, the calcination temperature of the eggshell was divided into 5 temperature variables such as 700, 800, 900, 1000, and 1100 ° C, and the calcination duration was 2 variables such as 1 hour and 2 hours. After the allergenic pairing, 10 examples of the calcined egg shell powder, such as Example B to Example K, can be obtained, and an uncalcined egg shell powder is used as Example A.

The calcining process is to take 30g eggshell powder and weigh it, then put it into the crucible. When the high-temperature furnace reaches the design temperature, it will start to count and then keep the temperature. After the set temperature is reached, remove the eggshell to be calcined. After the powder is cooled to room temperature, the weight is recorded and the recovery rate is calculated accordingly. Then the shell powder is placed in a sealed bag, and the air in the bag is exhausted and sealed for subsequent testing.

In Experiment 1, 30g of eggshell powder was placed in a high-temperature furnace and dried at 105 ° C for 24hrs before calcination. After weighing out, 27.6g was obtained after deducting the weight of the crucible. The water content was calculated as 0.8% by mass water content; Then take 30g of eggshell powder samples before calcination, and calcinate them at different times and temperatures. After calcining, take out the weighing and deduct the weight of the crucible. The obtained value is then based on After the mass recovery formula is calculated, the recovery percentages of Examples A to K can be obtained (Table 1), and the recovery percentages of Examples A to K are plotted and the recovery rate change curve is drawn (Figure 3).

Mass water content formula

Recovery formula

U is the mass water content (%)

m _wet is the quality of eggshell powder before drying

m _dry is the quality of eggshell powder after drying

P is the mass recovery rate (%)

m _dry is the quality of eggshell powder after drying

m _final is the quality of calcined eggshell powder

It was found that when calcined for 1 hour and at a temperature of 1000 ° C. or more and for 2 hours and at a temperature of 900 ° C. or more, the recovery rates of Examples G to K fell between 50% and 60%. It can be seen that under this calcination time and calcination temperature conditions, calcium carbonate (CaCO3) in the egg shell has been completely converted into calcium oxide (CaO), which is also called complete calcination, but the high temperature furnace is heated from 900 ° C to 1000 ° C. Energy consumption, therefore, the conditions of Example G, which was calcined for 2 hours and at a temperature of 900 ° C., are a better choice.

The second experiment compared the effect of calcination temperature and time on the surface microstructure of eggshell powder. An electron microscope (SEM) was used to analyze the microstructure of the calcined egg shell powder, and the surface microstructures of Examples A to K were magnified by an electron microscope at 3000 times, as shown in FIG. 4.

The photo A in FIG. 4 shows the microstructure of the eggshell powder before calcination showing a shale flake structure, and the state of Example A.

When the calcination temperature was 700 ° C. for 1 hour, the microstructure shale flake structure of the eggshell powder of Example B began to change, as shown in Photo B in FIG. 4.

When the eggshell powder was calcined at a temperature of 700 ° C to 800 ° C for 2 hours, the fine structure of the eggshell powder of Examples C, D, and E changed from a flat surface to a microporous floc. The temperature in this range should be calcium carbonate ( The critical temperature at which CaCO3) is converted into calcium oxide (CaO), as shown in photos C, D, and E in Figure 4. Therefore, the main component of calcium carbonate (CaCO3) at the eggshell is broken at this temperature and decomposed to produce carbon dioxide (CO2). ) And calcium oxide (CaO), carbon dioxide escapes to form a pore structure.

When the temperature was 900 ° C. for 1 hour, the planar structure disappeared, and Example F formed a porous floc structure, as shown in Photo F in FIG. 4.

When the calcination temperature is 900 ° C for more than 2 hours, almost all of the calcium carbonate in the eggshell powder is converted into crystals of calcium oxide. At this time, the crystal structure of the calcium oxide is arranged neatly, and the uniform distribution shows a multilayered microporous crystal structure, such as Photo G is shown in FIG. 4.

As the calcination time increases and the temperature increases, the content of calcium carbonate converted to calcium oxide increases, and flocculent structures increase and pores shrink. This is caused by the combination of calcium oxide with each other, as shown in the photo in Figure 4. G to K are shown.

It can be known from Experiment 2 that with the increase of the calcining time and temperature, the pore density between the microporous structures on the surface also increased significantly. Under the calcination conditions of Example G, the surface area of the eggshell powder also increased from a substantial increase to balance. At this time, the physical adsorption capacity of eggshell powder as an adsorbent should be the most economical and the best adsorption efficiency. This observation should increase the scope of its application.

The third experiment is the analysis of powder diffraction (XRD). In Experiment Three, Examples A to K were scanned and analyzed by a powder diffraction apparatus (XRD), and the spectra were compared with the data of the mineral crystal configuration to determine the eggshell powder after calcination temperature and time treatment. The changes in the crystal configuration and chemical composition of Examples A to K are shown in Figs. 5A and 5B.

In the uncalcined eggshell powder of Example A, significant peaks appeared at XRD 2θ scanning angles of 23.1 °, 29.5 °, 36.1 °, 39.5 °, 43.3 °, 47.6 °, and 48.6 °, as shown in Figure A in Figure A. As shown, the peak intensity at 29.5 ° is the largest. The XRD patterns of egg shell powder were further compared with different calcination temperature and time, and it was found that the intensity of the above 7 peaks decreased significantly as the calcination temperature or the period of time increased.

In Example D and Example E, new peaks appeared on the spectrum at the 2θ scanning angles of 32.3 °, 37.5 °, 54.0 °, 64.3 °, 67.5 °, and 79.8 °, as shown by the spectra D and E in FIG. 5A. It is shown that, under the processing condition of 800 ° C, the main component of calcium carbonate in the eggshell began to be converted into calcium oxide, and the molecular structure thereof began to change, and at the same time, the crystalline form was changed.

In Example F, among the previously appeared new peaks, the peaks of 32.3 °, 37.5 °, and 54.0 ° also have an increasing trend with the increase of the calcination temperature, as shown in the graph F in FIG. 5A.

Under the calcination conditions of Example G and Example H, the waveform of the map no longer changes significantly. At this time, the shale platelet structure of the original calcium carbonate is completely transformed into the lime multilayer microporous crystalline structure of calcium oxide. As shown in the graphs G to K in FIG. 5A. It can be seen that when the calcination exceeds 900 ° C for 2 hours, the reaction of calcium carbonate (CaCO3) to calcium oxide (CaO) also tends to be completed, and the change of the crystal form also tends to be stable at this time.

The fourth experiment was to analyze and analyze the calcium content in eggshell powder. It was previously known that the eggshell is composed of 95.1% inorganic matter and a small proportion of organic matter and other ingredients. After being calcined at high temperature, the organic matter and other ingredients will be burned and the inorganic matter will be volatilized with air, and the inorganic substance will be calcium carbonate (CaCO3). 94% is the highest. After calcination at high temperature, calcium carbonate (CaCO3) will be converted into calcium oxide (CaO) and carbon dioxide (CO2), and carbon dioxide (CO2) will volatilize with air and only calcium oxide (CaO) will be left. Increasing the calcination time and temperature will increase the unit weight of calcium oxide (CaO).

When the calcination is completed, calcium carbonate (CaCO3) has been completely converted into calcium oxide (CaO), so by measuring the content of calcium (Ca), you can obtain the time and temperature at which the calcination can be completed, and you can also calculate the oxygen activity in the future. The content is obtained based on the calcined products at different holding time and temperature, and the calcium (Ca) content is detected by an instrument, as shown in Table 2, and the calcium measured in Examples A to K can be obtained. (Ca) content value draws a change curve, as shown in Figure 6.

Through observation, it can be found that as the holding time and temperature of the calcination increase, the calcium (Ca) content of the calcined product also increases. Under the calcination conditions of Example G and Example H, the calcium content curve will It will be level and the value will fall between 650 ~ 700 (mg / kg). It can be seen that under the calcination conditions after Example G, calcium carbonate (CaCO3) in the egg shell has been completely converted into calcium oxide (CaO). As can be seen from Table 2 and FIG. 6, the calcination conditions of Example G can obtain the highest calcium content (693 mg / kg).

Experiment 5 is the effect of calcination temperature and time on the pH value of eggshell powder. After calcining the eggshell powder, it can transform calcium carbonate (CaCO3) into calcium oxide (CaO) and dissolve it in water to form an alkaline solution. After testing, if the pH value is greater than 8, it will have certain adsorption and antibacterial effect on microorganisms. . The eggshell powders of Examples A to K were detected by an instrument to have a pH value as listed in Table 3, and the pH values of the eggshell powders of Examples A to K were plotted as shown in FIG. 7.

Through observation, it can be found that whether calcined at 1 hour or 2 hours, the pH connection curves obtained at different calcination temperatures almost overlap, and the eggshell powder was calcined at 700 ° C in Examples B and C, and the pH value was changed from 5.29 turns into around 12.7.

It can be known from this that, at 700 ° C, calcium carbonate (CaCO3) has begun to transform into calcium oxide (CaO), and the pH values measured at different temperatures are not much different from each other. On the other hand, the content of calcium oxide (CaO) generated at 700 ° C is sufficient to make the pH value of its aqueous solution reach a critical mass of about 12.75, and it will not change due to changes in calcination time and temperature, and this pH value It is not conducive to the growth conditions of microorganisms, and helps the ability of surface ions to adsorb and exchange after calcination.

Experiment 6 is the effect of calcination temperature and time on the change of redox potential (ORP) of eggshell powder. The level of the oxidation-reduction potential (ORP) coefficient directly affects the adsorption capacity of the solution. When more negative electrons (e-) are attached to the water, the negative mV reading becomes lower, which represents the reducing power of water. The stronger it is, the higher the adsorption capacity to remove oxygen free radicals. The eggshell powders of Examples A to K were detected by the instrument as shown in Table 4, and the measured ORP values were plotted as shown in FIG. 8.

It can be seen from Table 4 that the redox potential difference of each example decreases from the relative potential of 172mV before calcination (Example A) with the increase of the calcination temperature, and decreases when the holding temperature increases. Degree increased. However, the magnitude of the potential drop begins to shrink when it exceeds 800 ° C (as in Examples F to K). In FIG. 8, the values of the oxidation-reduction potentials of Example F and Example G overlap, and the measured ORP values of -21 ~ -29 tend to be constant regardless of the increase in the calcination temperature thereafter. It can be seen that when the eggshell powder is completely calcined, the redox potential generated by the eggshell powder is about -196 mV, and the positive potential conditions required for the aerobic microorganisms to survive are no longer helpful for the adsorption of target substances. Redox decomposition. In addition, based on considerations of economic and energy saving conditions, Example F can obtain a relatively better redox potential value.

Experiment 7 is a sterilization experiment. Escherichia coli was selected as the verification object in the seventh line of the experiment. In many environmental and even sanitary environments, coliforms are most commonly used to detect and identify indicators of contamination. In addition to being easy to obtain and inexpensive, the rate of division and reproduction is fast. And the temperature and humidity conditions required for its growth are less limited, which is helpful for experiments under normal temperature and humidity.

It can be known from the results of the previous experimental test data that the eggshell powder of Example G is economical and the detection values tend to be constant or constant. Therefore, the eggshell powder of Example D to Example I and the E. coli solution were selected for sterilization in Experiment 7. experiment.

Experimental steps and processes:

(1) Make a dilution of E. coli and perform a ten-fold serial dilution to achieve a colony growth number of 25 to 250 CFU on the medium.

(2) Take 50 μl of the diluted E. coli solution and smear it on the culture medium. This is the control group.

(3) Take 1g of the eggshell powder of Example D to Example I and add them to 1L of E.coli diluted solution, and make 3 parts of the mixed solution. After leaving for 10, 20, and 30 minutes, apply 50 μl to smear Leave on the medium and let stand for 3 ~ 5 minutes.

(4) Place the culture medium which has been allowed to stand in a 37 ° C constant temperature incubator for 24 hours to invert.

(5) Calculate the number of colonies after the culture is completed.

Table 5 is calculated by calculating the number of colonies in Examples D to I, and the number of colonies is plotted as a change line graph shown in FIG. 9.

It can be observed that after calcining the eggshell under different conditions, it has the ability to reduce the number of colonies at a concentration of 1g / 1L, and its efficiency decreases with the higher the calcination time and temperature, and the same calcination time and temperature Under the conditions, the longer the action time, the lower the number of colonies.

It is known from the previous literature and pH detection that the higher the pH value, the better the antibacterial effect. In Experiment 7, the pH value of the eggshell powders of Examples D to I was about 12.7, which proves that the calcined eggshells of Examples D to I have sterilizing effects in addition to the antibacterial effect.

It was found that the number of colonies in the condition of standing for 10 minutes, from 124 in Example D to 84 in Example F, decreased by an equal difference of about 25. However, in Example F 84 and Example G 36, there were With a large gap, from 36 in Example G to 33 in Example I, there is only a small single-digit gap. This phenomenon can also be found in the parts of standing for 20 minutes and 30 minutes. In addition, the number of colonies was still detected in Examples D to F after 30 minutes of standing. On the other hand, the number of colonies in Examples G to I was 0, and the change of the substance detected in the previous experiment was calcium oxide (CaO). It can be confirmed that the germicidal effect is calcium oxide (CaO), and because the higher the calcination time and temperature, the more calcium oxide (CaO) is produced, the stronger the sterilization effect. After calcining at a temperature of 900 ° C for 2 hours (Example G), the calcination tends to be constant, and the sterilization reaches the highest efficiency. After that, calcium oxide (CaO) no longer changes with the increase in calcination temperature and time. At this time, if you want to increase the sterilization efficiency, you need to increase The added concentration of calcium oxide (CaO), and the sterilization efficiency also sterilizes as the sterilization time is longer, and the sterilization efficiency is 100% in a sterilization time of 30 minutes at a concentration of 1g / 1L.

Experiment eight is a formaldehyde removal experiment. In the formaldehyde removal test box, a honeycomb-shaped substrate is placed, and the egg shell powder after the original creation is distributed on the honeycomb-shaped substrate. After passing in formaldehyde gas, the initial analytical concentration of formaldehyde was 10.0 ppm; after one hour, the analytical concentration of formaldehyde in the test box dropped to 0.10 ppm, and the conversion rate of formaldehyde was 99.0%. It can be seen that the calcined eggshell powder provided in this creative embodiment has excellent formaldehyde adsorption effect, and can decompose organic pollutants in indoor air, thereby reducing the harm caused by organic pollutants to the human body.

In addition to directly placing the eggshell powder in a high-temperature furnace for calcination, according to another embodiment of the present invention, the eggshell powder can also be calcined under the condition of filling with nitrogen. The method of calcining eggshell powder under nitrogen filling conditions is described as follows: (1) Connect the outside of the high-temperature furnace with an alloy tube and the inside with a high-temperature resistant gypsum tube. In order not to affect the uniformity of the temperature in the furnace during the ventilation process Extend the gypsum nozzle in the high-temperature furnace to the center of the furnace so that the nitrogen flowing in is evenly distributed in the furnace; (2) Put the dried eggshell powder into the high-temperature furnace for calcination. When the temperature in the furnace reaches the set temperature, open the solenoid valve switch of the ventilation pipe and pass in nitrogen gas. The nitrogen flow rate is controlled to 100 ~ 500ml / min, and monitor the temperature change in the furnace to confirm that the nitrogen gas is passed in. The stability of the calcination temperature during the process. After the calcined eggshell powder is cooled to room temperature, the eggshell powder is sealed and packaged for analysis.

During the calcination process, the nitrogen gas inlet system uses a hollow gypsum tube and an alloy joint to connect the high-pressure nitrogen gas inlet tube. After the assembled inlet tube is installed in the ashing furnace, the ashing temperature is adjusted to a conversion temperature of 800 ℃, and injecting gas at a nitrogen flow rate of 100 mL / min, the calcination temperature can still be maintained at 800 ℃, showing that the nitrogen gas inlet system can operate in a stable state.

The eggshell powder was calcined at a calcium carbonate conversion temperature of 700 ° C and 800 ° C, and nitrogen was introduced during the process. From the X-ray spectrum of the calcined eggshell powder, it is known that the crystal structure of the shell powder at 700 ° C before and after calcination There are obvious differences. Further compare the calcium oxide conversion rate of calcined eggshell powder with different calcining temperatures (700 ° C and 800 ° C) and with or without nitrogen flow. The calcination temperatures are 700 ° C and 800 ° C. The conversion rates of calcium oxide were 29.0% and 87.5%, respectively. The calcination temperatures were 700 ° C and 800 ° C, and the conversion rates of calcium oxide under the conditions of introducing nitrogen were 38.5% and 95.6%, respectively. From this, it can be seen that the introduction of nitrogen can increase the calcium oxide conversion rate. The effect of increasing the amount of nitrogen on the conversion rate of calcium oxide was further explored. The amounts of nitrogen that were not passed in and 500 mL / min were compared at 800 ° C. The results showed that the conversion rates of calcium oxide were 89.0% and 97.8%, respectively. The effect of the amount on the conversion of calcium oxide was not significant.

In summary, with the adsorption particles made of eggshell, the biological calcium filter material provided by this creation can effectively filter out pathogenic sources (such as bacteria, mold and viruses), and further kill these pathogenic sources or Inhibit the growth of pathogenic sources. On the other hand, the filter material in the biological calcium filter material provided in this creation can decompose the organic pollutants in the indoor air, thereby reducing the harm caused by the organic pollutants to the human body.

The adsorption capacity of the biological calcium filter material provided by this creation has both physical and chemical adsorption. In addition to stacking and improving the effect of the adsorption capacity, its adsorption effect is more available. Adsorb indoor air pollutants and improve indoor air quality. The bio-calcium filter material provided in this creation can also be widely used to study more environmental restoration, and the bio-calcium filter material provided in this creation can be applied to green building materials, which will help increase the specific value of building materials. In the application as an adsorbent for air pollutants, its biological material properties can be used to replace other chemically synthesized substances, thereby adding strength to the sustainable and healthy environment of the planet.

The above descriptions are only the preferred and feasible embodiments of this creation. For example, the equivalent changes in the application of the new specification and patent application scope of this creation should be included in the scope of the patent of this creation.

Claims (6)

A filter material includes: a substrate; and a plurality of adsorbed particles distributed on the substrate. The adsorbed particles are made of calcined egg shell powder, and the adsorbed particles have multiple layers of microporosity. Crystalline structure; wherein the substrate has a first side and a second side, a fluid can flow in from the first side of the substrate, and then flow out from the second side; the adsorption particles are at least distributed on the substrate Between the first side surface and the second side surface and allowing the fluid to pass through. A filter material includes: a substrate; and a plurality of adsorbed particles distributed on the substrate. The adsorbed particles are made of calcined egg shell powder, and the adsorbed particles have multiple layers of microporosity. A crystalline structure; wherein the substrate has a surface, and a fluid can pass through the surface away from the substrate; the adsorption particles are layered and arranged on the surface of the substrate. The filter medium according to claim 1 or 2, wherein the adsorption particles are alkaline. The filter medium according to claim 3, wherein the pH of the adsorbed particles is greater than 12. The filter medium according to claim 1 or 2, wherein the adsorbed particles include more than 94% of calcium oxide (CaO). The filter medium according to claim 1 or 2, wherein the calcium content in the adsorbed particles is 650-750 mg / kg.