CN110975815A - Preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal - Google Patents
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Abstract
The invention discloses a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal, belonging to the technical field of active carbon processing, and the preparation method comprises the following steps: s1, preparing bamboo charcoal: drying the bamboo material at 50-150 ℃ for 10-60h, and carbonizing at 400-1000 ℃ under the condition of introducing nitrogen to obtain a bamboo material carbide; s2, crushing: crushing the bamboo material carbide, and sieving to obtain bamboo material powder; s3, dipping and washing: soaking the bamboo powder in nitric acid, stirring at 30-80 ℃ for 10-80h, then respectively adding distilled water and absolute ethyl alcohol, repeatedly washing to neutrality, and drying to obtain a powder product; s4, high-temperature calcination: calcining the powder product for 2-8h in the atmosphere of 600-1100 ℃ nitrogen to obtain the activated bamboo charcoal, and solving the problems of small specific surface area and uneven pore size distribution of the conventional activated carbon.
Description
Technical Field
The invention relates to the technical field of active carbon processing, in particular to a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal.
Background
With the wider application field and more diversified application directions of the activated carbon, the modified technology of the activated carbon is more diversified in order to meet different environments and special purposes. The modification of the activated carbon mainly changes the pore structure and the surface acidity and alkalinity of the activated carbon through physical and chemical treatment, or introduces or removes certain functional groups on the surface of the activated carbon so that the activated carbon has special adsorption performance and catalytic property. The specific surface area and the pore size distribution of the activated carbon prepared by different modification methods or different activators can be greatly different, and the property of the activated carbon can be influenced by the influence of temperature.
The surface functional groups of the activated carbon are oxidized and modified by an oxidant under proper conditions, so that the content of oxygen-containing functional groups is increased, and the adsorption capacity of the activated carbon can be enhanced. The oxidizing agent is different, the type and the number of the functional groups contained in the modified surface are different, and generally, the more the number of the oxygen-containing functional groups is, the stronger the adsorption performance of the activated carbon is. Because the cost required by the oxidation modified activated carbon is lower, the activated carbon with various specifications can be prepared according to the concentration or the dosage of the oxidant, and therefore, the method has wider application.
In the technical field of modified activated carbon, the specific surface area is closely related to the adsorption performance of the activated carbon. The optimal adsorption performance can be achieved only by continuously increasing the specific surface area, and meanwhile, the pore size distribution condition of the activated carbon is also an important parameter for analyzing the performance of the activated carbon. When the active bamboo charcoal is prepared by a traditional modification method, bamboo blocks are generally directly put into an activating agent for impregnation, and after washing, drying and high-temperature calcination, the obtained active bamboo charcoal has small specific surface area and uneven pore size distribution, thereby affecting the adsorption performance of the active bamboo charcoal.
In order to obtain activated bamboo charcoal with higher specific surface area and more uniform pore size distribution, people constantly change the preparation method of activated carbon. Usually, the food-grade activated carbon is mainly coconut shell activated carbon, which is favored by people by virtue of good adsorption performance, but because of the constraints of production cost and preparation conditions, the coconut shell activated carbon is not beneficial to large-scale production and cannot meet the market demand; the activated bamboo charcoal has the advantages of low production cost, simple preparation process, mass production and the like, but the specific surface area of the prepared activated bamboo charcoal cannot meet the requirements of people, the action time is limited, and the activated bamboo charcoal is mainly used for low-end products such as refrigerator deodorant and the like. Therefore, the bamboo resources abundant in China need to be utilized, the activated bamboo charcoal with large specific surface area, strong adsorption performance and long action time is developed, and the market blank of the food-grade activated carbon is filled.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal, which solves the problems of small specific surface area and uneven pore size distribution of the existing active carbon.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps:
s1, preparing bamboo charcoal: drying the bamboo material at 50-150 ℃ for 10-60h, and carbonizing at 400-1000 ℃ under the condition of introducing nitrogen to obtain a bamboo material carbide;
s2, crushing: crushing the bamboo material carbide, and sieving to obtain bamboo material powder;
s3, dipping and washing: soaking bamboo powder in nitric acid, stirring at 30-80 deg.C for 10-80h, adding distilled water and anhydrous ethanol, washing repeatedly to neutral, and drying to obtain powder product;
s4, high-temperature calcination: calcining the powder product for 2-8h in the atmosphere of 600-1100 ℃ nitrogen to obtain the activated bamboo charcoal.
More preferably: in step S3, in the repeated washing process of distilled water and absolute ethyl alcohol, the bamboo powder is washed by the distilled water and absolute ethyl alcohol which have been washed last time for 1-3 times, and then washed to be neutral by the distilled water and absolute ethyl alcohol.
Through the technical scheme, the distilled water and the absolute ethyl alcohol which are used last time are washed again, so that the method is convenient to recycle, the use amount of the distilled water and the absolute ethyl alcohol is reduced, the cost is reduced, and the nitric acid is convenient to recover from the washing mixed liquid.
More preferably: and (4) carrying out vacuum filtration on the bamboo material powder repeatedly washed to be neutral, and then drying.
Through above-mentioned technical scheme, realize solid-liquid separation, reduce the washing liquid residue in the bamboo material powder, shorten drying time.
More preferably: the bamboo material is one or more of bamboo branch, bamboo rod, bamboo root and bamboo bits.
More preferably: in step S2, the bamboo charcoal is crushed and then sieved through a 100 mesh sieve.
More preferably: in step S4, the calcination temperature of the powder product is 800-1000 ℃.
More preferably: in step S3, the nitric acid is 1mol/L HNO3 solution.
More preferably: in step S3, after the bamboo powder is soaked in nitric acid, the bamboo powder is stirred for 10-80h by a heat-collecting constant-temperature heating magnetic stirrer.
More preferably: in step S3, the bamboo powder is washed repeatedly to neutral, and dried at 50-150 deg.C for 3-12 h.
More preferably: in step S1, the bamboo is dried for 10-60h by an electric heating constant temperature air drying oven.
In conclusion, the invention has the following beneficial effects: the surface functional groups of the activated carbon comprise carboxyl, carbonyl, phenols, lactone groups, quinones and the like, and the modified activated carbon can increase the number of the surface functional groups of the activated carbon and effectively improve the adsorption capacity and the catalytic effect of the activated carbon. Oxidative modification is one of chemical modifications, and is the most commonly used method for increasing oxygen-containing functional groups on the surface of activated carbon. The bamboo charcoal activated carbon has the characteristics of high mechanical strength, developed pore structure, high adsorption speed, high adsorption capacity, easiness in regeneration, durability and the like, the nitric acid modified bamboo charcoal activated carbon is strong in nitric acid oxidizability, and HNO3 solution can remarkably increase oxygen-containing functional groups on the surfaces of carboxyl, carbonyl, phenolic hydroxyl, lactone and the like and increase the acidity of the surface of the activated carbon. In the process of modifying the nitric acid, new pores are continuously generated while the pore structure of the activated carbon is damaged. The preparation method provided by the invention comprises the steps of carbonizing the bamboo blocks, carrying out oxidation modification by using nitric acid with certain concentration, washing, drying, and then calcining at high temperature to finally obtain the active bamboo charcoal with high specific surface area. Compared with the traditional preparation method of the activated bamboo charcoal, the preparation method of the activated bamboo charcoal has the advantages of simple process, easily obtained raw materials, larger specific surface area, uniform pore size distribution and capability of enhancing the adsorption capacity of the activated bamboo charcoal to a greater extent. Meanwhile, the concentration of the oxidant has controllability, the pore size of the product can be regulated, the pore channel is not easy to collapse, and the pore channel is not easy to block in the adsorption process, so that the action time is longer.
Drawings
FIG. 1 is a graph of isothermal physical adsorption-desorption curve of the oxidation modified activated bamboo charcoal N2 in the examples.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L HNO3 solution for soaking, placing the bamboo powder in a 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 24 hours, washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, carrying out vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 1000 ℃ for 4h in a nitrogen atmosphere to obtain the activated bamboo charcoal A1. The activated bamboo charcoal A1 is tested to obtain the characteristic parameters of the activated bamboo charcoal A1, and the specific surface area and the average pore diameter of the activated bamboo charcoal A1 are shown in Table 1.
Example 2: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L HNO3 solution for soaking, placing the bamboo powder in a 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 24 hours, washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, carrying out vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 800 ℃ in nitrogen atmosphere for 4h to obtain the activated bamboo charcoal A2. The activated bamboo charcoal A2 is tested to obtain the characteristic parameters of the activated bamboo charcoal A2, and the specific surface area and the average pore diameter of the activated bamboo charcoal A2 are shown in Table 1.
Example 3: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L HNO3 solution for soaking, placing the bamboo powder in a 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 24 hours, washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, carrying out vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 600 ℃ for 4h in a nitrogen atmosphere to obtain the activated bamboo charcoal A3. The activated bamboo charcoal A3 is tested to obtain the characteristic parameters of the activated bamboo charcoal A3, and the specific surface area and the average pore diameter of the activated bamboo charcoal A3 are shown in Table 1.
Example 4: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Soaking 5g of bamboo powder in 1mol/L NaOH solution, placing the bamboo powder in a 60 ℃ heat collection type constant-temperature heating magnetic stirrer for stirring for 24 hours, washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, performing vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 800 ℃ in nitrogen atmosphere for 4h to obtain the activated bamboo charcoal A4. The activated bamboo charcoal A4 is tested to obtain the characteristic parameters of the activated bamboo charcoal A4, and the specific surface area and the average pore diameter of the activated bamboo charcoal A4 are shown in Table 1.
Example 5: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 65% of HNO3 solution for soaking, placing the bamboo powder in a 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 24 hours, then washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, carrying out vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 800 ℃ in nitrogen atmosphere for 4h to obtain the activated bamboo charcoal A5. The activated bamboo charcoal A5 is tested to obtain the characteristic parameters of the activated bamboo charcoal A5, and the specific surface area and the average pore diameter of the activated bamboo charcoal A5 are shown in Table 1.
Example 6: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L of HNO3 solution for dipping, placing the bamboo powder in a 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 12 hours, firstly washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder by using new distilled water and the absolute ethyl alcohol until the bamboo powder is neutral, then adding 1mol/L of NaOH solution for dipping, placing the bamboo powder in the 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 12 hours, respectively adding new distilled water and the absolute ethyl alcohol for repeatedly washing until the bamboo powder is neutral, carrying out vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 800 ℃ in nitrogen atmosphere for 4h to obtain the activated bamboo charcoal A6. The activated bamboo charcoal A6 is tested to obtain the characteristic parameters of the activated bamboo charcoal A6, and the specific surface area and the average pore diameter of the activated bamboo charcoal A6 are shown in Table 1.
Example 7: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 120 ℃ electric heating constant temperature blast drying oven for 48h, and carbonizing at 800 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L HNO3 solution for soaking, placing the bamboo powder in a 60 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 12 hours, washing the bamboo powder for 2 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, carrying out vacuum filtration, and drying the bamboo powder for 6 hours at 60 ℃ to obtain a powder product. Calcining the powder product at 800 ℃ in a nitrogen atmosphere for 4h, taking out, adding 1mol/L NaOH solution for soaking, placing in a 60 ℃ heat collection type constant-temperature heating magnetic stirrer for stirring for 12h, and then respectively adding new distilled water and absolute ethyl alcohol for repeatedly washing to neutrality to obtain the activated bamboo charcoal A7. The activated bamboo charcoal A7 is tested to obtain the characteristic parameters of the activated bamboo charcoal A7, and the specific surface area and the average pore diameter of the activated bamboo charcoal A7 are shown in Table 1.
Example 8: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying the bamboo branches in a 50 ℃ electric heating constant temperature blast drying oven for 10h, and carbonizing at 400 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L HNO3 solution for soaking, placing the bamboo powder in a 30 ℃ heat collection type constant temperature heating magnetic stirrer for stirring for 10 hours, washing the bamboo powder with the distilled water and the absolute ethyl alcohol which are washed for the last time for 1 time, repeatedly washing the bamboo powder with new distilled water and absolute ethyl alcohol until the bamboo powder is neutral, carrying out vacuum filtration, and drying the bamboo powder for 3 hours at 50 ℃ to obtain a powder product. Calcining the powder product at 600 ℃ for 2h in a nitrogen atmosphere to obtain the activated bamboo charcoal A8. The activated bamboo charcoal A8 is tested to obtain the characteristic parameters of the activated bamboo charcoal A8, and the specific surface area and the average pore diameter of the activated bamboo charcoal A8 are shown in Table 1.
Example 9: a preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal comprises the following steps: drying bamboo branches in a 150 ℃ electric heating constant temperature blast drying oven for 60h, and carbonizing at 1000 ℃ under the condition of introducing nitrogen to obtain the bamboo material carbide. And (3) crushing the bamboo material carbide, and sieving by a 100-mesh sieve to obtain the bamboo material powder. Adding 5g of bamboo powder into 1mol/L HNO3 solution for soaking, placing the bamboo powder in a heat collection type constant temperature heating magnetic stirrer at 80 ℃ for stirring for 80h, washing the bamboo powder for 3 times by using the distilled water and the absolute ethyl alcohol which are washed last time, repeatedly washing the bamboo powder to be neutral by using new distilled water and absolute ethyl alcohol, carrying out vacuum filtration, and drying the bamboo powder for 12h at 150 ℃ to obtain a powder product. Calcining the powder product at 1100 ℃ for 8h in a nitrogen atmosphere to obtain the activated bamboo charcoal A9. The activated bamboo charcoal A9 is tested to obtain the characteristic parameters of the activated bamboo charcoal A9, and the specific surface area and the average pore diameter of the activated bamboo charcoal A9 are shown in Table 1.
The specific surface areas and average pore diameters of the activated bamboo charcoal obtained in examples 1-9, a1, a2, A3, a4, a5, a6, a7, A8, and a9, are shown in table 1:
TABLE 1 characteristic parameters of activated bamboo charcoal
As can be seen from table 1, the specific surface area of the activated bamboo charcoal is sequentially activated bamboo charcoal a1, activated bamboo charcoal a5, activated bamboo charcoal a7, activated bamboo charcoal a4, activated bamboo charcoal a2, activated bamboo charcoal A3, activated bamboo charcoal a6, activated bamboo charcoal A8 and activated bamboo charcoal a 9; the average pore diameter of the activated bamboo charcoal is sequentially activated bamboo charcoal A1, activated bamboo charcoal A4, activated bamboo charcoal A6, activated bamboo charcoal A3, activated bamboo charcoal A5, activated bamboo charcoal A7, activated bamboo charcoal A2, activated bamboo charcoal A8 and activated bamboo charcoal A9. Comparing the activated bamboo charcoal A1, the activated bamboo charcoal A2 and the activated bamboo charcoal A3, the lower the high-temperature calcination temperature is, the smaller the specific surface area of the activated bamboo charcoal is.
As shown in fig. 1, the N2 physical adsorption-desorption isotherm graph of the oxidation-modified activated bamboo charcoal a1 shows that the adsorption capacity is gradually increased in the low-pressure section, and the adsorption capacity is suddenly increased around 0.9-1.0 at P/P0, the position of the section reflects the size of the pore diameter of the sample, and the width of the change can be used as a basis for measuring the uniformity of mesopores.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several improvements and modifications without departing from the principle of the present invention will occur to those skilled in the art, and such improvements and modifications should also be construed as within the scope of the present invention.
Claims (10)
1. A preparation method of nitric acid oxidation modified high-temperature carbonized active bamboo charcoal is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing bamboo charcoal: drying the bamboo material at 50-150 ℃ for 10-60h, and carbonizing at 400-1000 ℃ under the condition of introducing nitrogen to obtain a bamboo material carbide;
s2, crushing: crushing the bamboo material carbide, and sieving to obtain bamboo material powder;
s3, dipping and washing: soaking the bamboo powder in nitric acid, stirring at 30-80 ℃ for 10-80h, then respectively adding distilled water and absolute ethyl alcohol, repeatedly washing to neutrality, and drying to obtain a powder product;
s4, high-temperature calcination: calcining the powder product for 2-8h at 600-1100 ℃ in a nitrogen atmosphere to obtain the activated bamboo charcoal.
2. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: in step S3, in the repeated washing process of distilled water and absolute ethyl alcohol, the bamboo powder is washed by the distilled water and absolute ethyl alcohol which have been washed last time for 1-3 times, and then washed to be neutral by the distilled water and absolute ethyl alcohol.
3. The preparation method of nitric acid oxidation modified high-temperature charring activated bamboo charcoal as claimed in claim 2, is characterized in that: and (4) carrying out vacuum filtration on the bamboo material powder repeatedly washed to be neutral, and then drying.
4. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: the bamboo material comprises one or more of bamboo branch, bamboo rod, bamboo root and bamboo scrap.
5. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: in step S2, the bamboo charcoal is pulverized and then sieved through a 100 mesh sieve.
6. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: in step S4, the calcination temperature of the powder product is 800-1000 ℃.
7. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: in step S3, the nitric acid is 1mol/L HNO3 solution.
8. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: in step S3, after the bamboo powder is soaked in nitric acid, the bamboo powder is stirred for 10-80 hours by a heat collection type constant temperature heating magnetic stirrer.
9. The preparation method of nitric acid oxidation modified high-temperature charring activated bamboo charcoal as claimed in claim 7, is characterized in that: in step S3, the bamboo powder is repeatedly washed to neutrality and then dried at 50-150 ℃ for 3-12 h.
10. The method for preparing nitric acid oxidation modified high-temperature charring active bamboo charcoal according to claim 1, is characterized in that: in step S1, the bamboo is dried for 10-60h by an electric heating constant temperature air drying oven.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111874985A (en) * | 2020-07-30 | 2020-11-03 | 中国科学院山西煤炭化学研究所 | Method for treating industrial organic wastewater by using metal-loaded modified kerogen |
| CN112079353A (en) * | 2020-09-04 | 2020-12-15 | 仲恺农业工程学院 | Preparation technology of active biochar for modifying traditional Chinese medicine residues |
| CN114436468A (en) * | 2021-12-27 | 2022-05-06 | 中国能源建设集团广东省电力设计研究院有限公司 | Ecological chinampa device |
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