Preparation method of cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC

Abstract

The invention discloses a preparation method of a cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC (Total Volatile Organic Compounds), which comprises the following steps: cooking cyclobalanopsis glauca branches and leaves in boiling water, soaking the cooked cyclobalanopsis glauca branches and leaves in a 0.2 g / L neutral protease solution for 30-60 minutes, soaking in a 0.3 g / L cellulase solution for 30-60 minutes, and finally carrying out enzyme deactivation treatment. And washing the cyclobalanopsis glauca branches and leaves after enzyme deactivation with clear water to be neutral, drying with a drying oven, crushing, and sieving with a 30-50-mesh sieve to obtain the cyclobalanopsis glauca leaf tea. The prepared cyclobalanopsis glauca leaf adsorbent is simple in preparation process, low in cost and free of secondary pollution to the environment, most importantly, the adsorbent is prepared from waste, the green and low-carbon environmental protection concept is met, and the cyclobalanopsis glauca leaf adsorbent is worthy of development and popularization. The cyclobalanopsis glauca branch and leaf adsorbent is relatively good in TVOC adsorption performance and can be used for purifying TVOC in indoor air, and analysis and regeneration experiments on the used adsorbent find that the cyclobalanopsis glauca branch and leaf adsorbent is good in recyclability, can be repeatedly used and conforms to the environmental protection concept.

Description

Technical Field

[0001] The invention belongs to the technical field of adsorbents, and in particular relates to a method for preparing a Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC. Background Art

[0002] Cyclobalanopsis glauca is an evergreen tree of the genus Quercus in the Fagaceae family, with glabrous twigs. Its leaves are leathery, with acuminate or short-tailed apex, rounded or broadly cuneate base, sparse serrations on the leaf margin above the middle, distinct lateral veins on the back of the leaf, and glabrous leaf surface. Cyclobalanopsis glauca leaves are generally obovate-elliptical or oblong, with a length of 6-13 cm and a width of 2-5.5 cm. Cyclobalanopsis glauca leaves are acuminate or short-tailed apex, with a rounded or broadly cuneate base. The edges of Cyclobalanopsis glauca leaves are sparsely serrated above the middle, with 9-13 lateral veins on each side, distinct lateral veins on the back of the leaf, and neatly flat white single hairs, but these hairs will gradually fall off over time, and there are often white scales. The petiole length of Cyclobalanopsis glauca leaves is generally between 1-3 cm. The Linzhi area in southeastern Tibet is rich in forest resources, with a forest area of ​​2.46 million hectares and a forest coverage rate of 46.09%. In 2011, the annual logging volume in the area reached 450,000 m 3 Due to the backward production technology of the forest farm, the amount of forest waste is astonishing. According to statistics, the forest waste that has not been effectively treated in the area for a long time accounts for about 40% of the total logging volume. The total amount of forest waste is no less than 360,000 m3 per year. 3 .

[0003] The full name of TVOC is total volatile organic compounds. People who study indoor air quality usually call the indoor organic gaseous substances that are sampled and analyzed as VOC, and VOC can be collectively referred to as TVOC. TVOC refers to organic compounds with a saturated vapor pressure of more than 133.32 Pa at room temperature and a boiling point of 50°C to 250°C, which can exist in the air in the form of evaporation at room temperature. Due to its toxicity, irritation, carcinogenicity and special odor, it will affect the skin and mucous membranes and cause acute damage to the human body. It is one of the pollutants that affect indoor air quality. The source of TVOC is very wide. Indoor TVOC mainly comes from various coatings, adhesives, artificial boards, furniture, wallpaper and other materials used in the decoration and furniture manufacturing process. In addition, coal burning, natural gas, heating, cooking and other processes in family life will also release TVOC. Outdoor TVOC mainly comes from waste gas generated by transportation, waste gas generated by industrial production and fuel combustion, etc. TVOC may cause many harms to the human body. First of all, it has a pungent smell and may cause sensory discomfort to the human body, causing headaches and eye pain. TVOC can also affect the human immune system. It can cause immune disorders, reduce human resistance, and increase the risk of disease. Generally, when the TVOC concentration is 3.0~25mg / m3 When the TVOC concentration is greater than 25 mg / m 3 When it is too high, it may lead to more serious consequences, such as headaches and other neurotoxic effects. Therefore, in order to maintain human health, it is very important to keep the concentration of TVOC in the air within a safe range.

[0004] If we can make full use of the abandoned branches and leaves of the Chinese glauca in the Tibet area and use them to remove TVOC, we can make full use of resources, solve the problem of low utilization rate of abandoned wood, and prepare an adsorbent that is highly efficient in absorbing TVOC. Summary of the invention

[0005] In view of the above shortcomings, the present invention provides a method for preparing a Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC, which is achieved by the following technical means:

[0006] The present invention first discloses a method for preparing a Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC, comprising:

[0007] (1) Wash and dry the discarded Cyclobalanopsis glauca branches and leaves for later use;

[0008] (2) Take the dried Cyclobalanopsis glauca branches and leaves, place them in boiling water and cook them, then remove them and set them aside;

[0009] (3) Soak the steamed Cyclobalanopsis glauca branches and leaves in a 0.2 g / L neutral protease solution for 30-60 min, and remove them for later use;

[0010] (4) Soak the Cyclobalanopsis glauca branches and leaves soaked in neutral protease in 0.3 g / L cellulase solution for 30-60 min, and remove them for later use;

[0011] (5) taking out the branches and leaves of Cyclobalanopsis glauca after the cellulose soaking treatment and performing enzyme inactivation treatment;

[0012] (6) After the enzyme is inactivated, the leaves and branches of Cyclobalanopsis glauca are rinsed with clean water until they are neutral, dried in an oven, and crushed through a 30-50 mesh sieve to obtain the obtained product.

[0013] Furthermore, the cooking time in step (2) is 10-30 minutes.

[0014] Furthermore, the immersion treatment in step (3) also includes being completed in a constant temperature water bath at 40°C.

[0015] Furthermore, the immersion treatment in step (4) also includes being completed in a constant temperature water bath at 45°C.

[0016] Furthermore, in step (5), the enzyme inactivation temperature is 75° C. and the enzyme inactivation time is 10 min.

[0017] Furthermore, in step (6), the oven temperature is 60-100° C., and the drying time is 24 hours.

[0018] The invention also discloses a Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC, which is prepared according to any one of the above preparation methods.

[0019] The invention also discloses an application of the Cyclobalanopsis glauca branch and leaf adsorbent in removing TVOC.

[0020] Furthermore, the application includes:

[0021] Take 2g of 30-50 mesh cyclopentane leaf adsorbent and place it in a 200 μl column to a concentration of 1.86mg / m 3 The adsorption was carried out in TVOC for 150 min at a temperature of 25 °C.

[0022] Furthermore, the application also includes:

[0023] The Cyclobalanopsis glauca branches and leaves adsorbent was desorbed after adsorbing TVOC.

[0024] Furthermore, the application also includes:

[0025] The desorption process comprises:

[0026] The Cyclobalanopsis glauca branches and leaves adsorbent used for TVOC adsorption is exposed to the sun for several times to complete the desorption.

[0027] Furthermore, the several times is 7 times.

[0028] The beneficial effects of the present invention are:

[0029] The present invention uses cycad glauca leaves for processing to prepare cycad glauca leaf adsorbent, which has relatively good TVOC adsorption performance and can be used to purify TVOC in indoor air. Elemental analysis and infrared spectrum analysis of the adsorbent show that its adsorption performance mainly comes from the hydroxyl groups on the adsorbent, verifying that the adsorption process is mainly chemical adsorption. At the same time, analytical regeneration experiments show that the cycad glauca leaf adsorbent has good recyclability and can be reused many times, which is in line with the concept of environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a comparison chart of the adsorption rate of TVOC by different materials;

[0031] Figure 2 The infrared spectra of different Cyclobalanopsis glauca branches and leaves were obtained by FTIR (Fourier transform infrared spectrometer), wherein: A is the Cyclobalanopsis glauca leaf adsorbent after adsorption, B is the original Cyclobalanopsis glauca branches and leaves, and C is the Cyclobalanopsis glauca leaf adsorbent prepared in Example 1;

[0032] Figure 3The electron microscope scanning images of different Cyclobalanopsis glauca branches and leaves, wherein: A is the original Cyclobalanopsis glauca branches and leaves; B is the Cyclobalanopsis glauca leaf adsorbent prepared in Example 1; and C is the Cyclobalanopsis glauca leaf adsorbent after adsorption.

[0033] Figure 4 This is a diagram showing the desorption and regeneration effect of the Cyclobalanopsis glauca leaf adsorbent prepared in the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0036] Example 1

[0037] A method for preparing a Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC, comprising:

[0038] (1) Wash and dry the discarded Cyclobalanopsis glauca branches and leaves for later use;

[0039] (2) Place the dried Cyclobalanopsis glauca branches and leaves in boiling water and cook for 10-30 min, then remove and set aside;

[0040] (3) Soak the steamed Cyclobalanopsis glauca branches and leaves in a 0.2 g / L neutral protease solution for 30-60 min. The entire soaking process is completed in a constant temperature water bath at 40° C., and then fished out for later use;

[0041] (4) Soaking the Cyclobalanopsis glauca branches and leaves soaked in a 0.3 g / L cellulase solution for 30-60 min. The entire soaking process is completed in a constant temperature water bath at 45° C., and then the leaves are removed for later use.

[0042] (5) After the cellulose soaking treatment, remove the Cyclobalanopsis glauca branches and leaves and inactivate the enzyme at 75°C for 10 min;

[0043] (6) After the enzyme is inactivated, the branches and leaves of the Cyclobalanopsis glauca are rinsed with clean water until they are neutral, dried in an oven at 60-100°C for 24 hours, and crushed through a 30-50 mesh sieve to obtain the product.

[0044] Example 2

[0045] Application of a Cyclobalanopsis glauca branch and leaf adsorbent in removing TVOC

[0046] Take 2g of 30-50 mesh cyclopentane leaf adsorbent and place it in a 200 μl column to a concentration of 1.86mg / m 3 The adsorption time was 150 min in TVOC, and the adsorption temperature was 25℃;

[0047] After the adsorption was completed, the Cyclobalanopsis glauca branches and leaves adsorbent that had adsorbed TVOC was exposed to the sun for 7 times to complete the desorption.

[0048] Test Example 1

[0049] Horizontal comparison experiment

[0050] In the same environment, common adsorption materials such as activated carbon, bamboo charcoal, diatomaceous earth, resin, etc. on the market were used for adsorption test with the original untreated Cyclobalanopsis glauca leaves, and the adsorption effect was compared and analyzed with the Cyclobalanopsis glauca leaf adsorbent in Example 1 under the same adsorption conditions. Figure 1 : Figure 1 From left to right, the adsorption rates of TVOC by various adsorbents at 30, 60, 90, 120 and 150 min are shown respectively. It is observed that the Cyclobalanopsis glauca leaf adsorbent is the best, followed by diatomaceous earth, followed by activated carbon, bamboo charcoal and resin. The original modified material has the best adsorption effect on TVOC (F=457.711P<0.01). Therefore, the modified Cyclobalanopsis glauca leaf is significantly superior to other materials.

[0051] Test Example 2

[0052] Characterization and observation of adsorbent

[0053] The elemental composition of the surface of Cyclobalanopsis glauca leaves was analyzed by element analyzer. The specific results are shown in Table 1.

[0054] Table 1 Element analysis table

[0055]

[0056] According to the results in Table 1, elemental analysis was performed on the original Cyclobalanopsis glauca leaves, the modified Cyclobalanopsis glauca leaves (i.e., Example 1), and the optimized Cyclobalanopsis glauca leaves after adsorption using an elemental analyzer. It was observed that the contents of N, C, H, and other elements were significantly increased after modification, while the contents of these elements decreased after adsorption, indicating that the modification method increased the surface groups of the Cyclobalanopsis glauca leaves, such as hydroxyl groups, carboxyl groups, etc., and these groups participated in the process of adsorbing TVOC.

[0057] FTIR analysis results

[0058] FTIR (Fourier Transform Infrared Spectrometer) can produce infrared spectra of samples, help infer the molecular structure, and analyze the adsorption mechanism of TVOC by Cyclobalanopsis glauca leaves adsorbent. For detailed results, see Figure 2 .according to Figure 2 The results show that A is the Cyclobalanopsis glauca leaves after adsorption, B is the original Cyclobalanopsis glauca branches and leaves, and C is the Cyclobalanopsis glauca leaves adsorbent prepared in Example 1. The following information can be obtained:

[0059] (1) At wave numbers of 3446.21 cm -1 ,3444.43cm -1 ,3426.53cm -1 The existence of obvious absorption peaks indicates that there are a large number of -OH groups in the Cyclobalanopsis glauca leaves, which play a role in the adsorption process. This indicates that the treatment method increases the hydroxyl groups in the Cyclobalanopsis glauca leaves and improves the adsorption effect.

[0060] (2) At wave number 1047.89 cm -1 , 1053.72cm -1 , 1066.67cm -1 The absorption peak is that of carboxyl group, which proves that it is also involved in the adsorption process.

[0061] (3) Wave number is 1242.80 cm -1 The -COC- group exists at the site and participates in the adsorption process.

[0062] In summary, different groups play different roles and effects in the adsorption process, and the hydroxyl group plays a decisive role.

[0063] Scanning electron microscope to observe its surface structure

[0064] The scan results are as follows Figure 3 As shown, observation of the electron microscope image shows that the modification method transforms the plant surface tissue into a dense fibrous network structure, presenting a loose and porous morphology, which greatly enhances its adsorption capacity.

[0065] Test Example 3

[0066] Desorption and regeneration effect of the Cyclobalanopsis glauca leaf adsorbent prepared by the present invention

[0067] Desorption regeneration means that after the adsorbent is saturated with adsorption, in order to make it recyclable, some chemical methods or drying in the sun can be used to treat the adsorbent to restore its adsorption capacity. Desorption regeneration can not only maximize the utilization efficiency of Cyclobalanopsis glauca leaves, but also conform to the country's sustainable development strategy. This experiment uses the method of drying in the sun to carry out the desorption regeneration experiment. The specific results are as follows Figure 4As shown: With the increase of the number of desorption and regeneration experiments, the adsorption rate of the Cyclobalanopsis glauca leaf adsorbent gradually decreased, but the decrease was not large and it still had good adsorption performance (F=4675.183, P<0.01). Therefore, it can be recycled during use to meet the green and low-carbon environmental protection concept.

[0068] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0069] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for preparing a Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC, comprising: (1) Wash and dry the discarded Cyclobalanopsis glauca branches and leaves for later use; (2) Take the dried Cyclobalanopsis glauca branches and leaves, place them in boiling water and cook them, then remove them and set them aside; (3) Soak the steamed Cyclobalanopsis glauca branches and leaves in a 0.2 g / L neutral protease solution for 30-60 min, and remove them for later use; (4) Soak the Cyclobalanopsis glauca branches and leaves soaked in neutral protease in 0.3 g / L cellulase solution for 30-60 min, and remove them for later use; (5) taking out the branches and leaves of Cyclobalanopsis glauca after the cellulose soaking treatment and performing enzyme inactivation treatment; (6) After the enzyme is inactivated, the leaves and branches of Cyclobalanopsis glauca are rinsed with clean water until they are neutral, dried in an oven, and crushed through a 30-50 mesh sieve to obtain the obtained product.

2. The preparation method according to claim 1, wherein: The cooking time in step (2) is 10-30 minutes.

3. The preparation method according to claim 1, wherein: The immersion treatment in step (3) also includes being completed in a constant temperature water bath at 40°C.

4. The preparation method according to claim 1, wherein: The immersion treatment in step (4) also includes being completed in a constant temperature water bath at 45°C.

5. The preparation method according to claim 1, wherein: The enzyme inactivation temperature in step (5) is 75° C. and the enzyme inactivation time is 10 min.

6. The preparation method according to claim 1, wherein: The oven temperature in step (6) is 60-100° C. and the drying time is 24 hours.

7. A Cyclobalanopsis glauca branch and leaf adsorbent for removing TVOC prepared according to the preparation method according to any one of claims 1 to 6.

8. Use of the Cyclobalanopsis glauca branches and leaves adsorbent according to claim 7 in removing TVOC.

9. The use according to claim 8, comprising: Take 2g of 30-50 mesh cyclopentane leaf adsorbent and place it in a 200 μl column to a concentration of 1.86mg / m 3 The adsorption time was 150 min in TVOC, and the adsorption temperature was 25℃; After the adsorption is completed, the Cyclobalanopsis glauca branches and leaves adsorbent that has adsorbed TVOC is desorbed.

10. The use according to claim 9, wherein: The desorption process is: The Cyclobalanopsis glauca branches and leaves adsorbent used for TVOC adsorption was exposed to the sun for 7 times to complete the desorption.

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