Method for preparing metal nanoparticle active carbon with high specific surface area by utilizing biological heavy oil
By heating and heating the bio-heavy oil with metal chloride and nano-magnesium oxide multiple times, combined with impregnation and drying treatment, the problem of low specific surface area of activated carbon for bio-heavy oil preparation is solved, and metal nanoparticle activated carbon with high specific surface area and porous structure is prepared, which improves its application performance.
Patent Information
- Application Number
- CN202510080022.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-19
- Publication Date
- 2025-04-29
AI Technical Summary
The prior art When preparing activated carbon using bioheavy oil, the specific surface area of activated carbon is low, which limits its application effect in the fields of electrode materials and catalysts.
The first heating treatment is performed by mixing the bio-heavy oil with metal chloride, then mixing it with nanomagnesium oxide and performing a second heating treatment, followed by heating treatment, impregnation treatment and drying treatment, and finally forming metal nanoparticle activated carbon.
The prepared metal nanoparticle activated carbon has a porous structure and a high specific surface area (up to 1609m2/g), which improves its performance in the fields of catalysis and electrochemistry.
Smart Images
Figure CN119898769A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of biomass resource utilization and activated carbon technology, and in particular to a method for preparing high specific surface area metal nanoparticle activated carbon by utilizing biological heavy oil. Background Art
[0002] Bio-heavy oil is a low-cost, abundant biomass oil with high oxygen content, low sulfur content and high calorific value. It has attracted more and more attention in the context of increasing energy shortage. Bio-heavy oil is generally treated by direct combustion, which will produce a large amount of pollutants such as SO2, CO, CO2, etc., which seriously pollutes the atmospheric environment and is one of the sources of pollution in the current haze problem. Activated carbon is widely used in electrode materials, water pollution treatment, catalysts or catalyst carriers for various chemical reactions due to its high specific surface area and pore structure. Therefore, the use of bio-heavy oil to prepare activated carbon can not only save energy, but also reduce environmental pollution and realize green carbon cycle, which has become an important direction of current research.
[0003] At present, the existing technology usually uses pyrolysis to pyrolyze heavy bio-oil to prepare activated carbon. However, due to the poor morphological characteristics of heavy bio-oil itself, the activated carbon directly obtained by pyrolysis has a low specific surface area, which limits the application of activated carbon prepared from heavy bio-oil in the fields of electrode materials, catalysts for various chemical reactions, or catalyst carriers.
[0004] Therefore, how to use bio-heavy oil to prepare high specific surface area activated carbon is a technical problem that needs to be solved urgently in this field. Summary of the invention
[0005] The present invention provides a method for preparing high specific surface area metal nanoparticle activated carbon by using biological heavy oil, through which metal nanoparticle activated carbon with a porous structure and high specific surface area can be prepared. The preparation method is simple in process and can be widely promoted and applied.
[0006] The present invention also provides a metal nanoparticle activated carbon, which is prepared by the above method, so the metal nanoparticle activated carbon has a porous structure and a high specific surface area.
[0007] The first aspect of the present invention provides a method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil, comprising:
[0008] Performing a first heating treatment on a first mixture of the bio-heavy oil and the metal chloride to obtain a first product;
[0009] performing a second heating treatment on a second mixture obtained by mixing the first product with nano-magnesium oxide to obtain a second product;
[0010] performing a first heating treatment on the second product to obtain a metal nanoparticle carbon material;
[0011] After impregnating the metal nanoparticle carbon material with a potassium source solution, the metal nanoparticle activated carbon precursor is obtained by drying.
[0012] Performing a second temperature raising treatment on the metal nanoparticle activated carbon precursor to form the metal nanoparticle activated carbon;
[0013] The temperature during the second heat treatment is higher than the temperature during the first heat treatment.
[0014] In the method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, the metal chloride is any one of nickel chloride, magnesium chloride and copper chloride.
[0015] As described above, in the method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil, the mass ratio of the bio-heavy oil, the metal chloride and the nano-magnesium oxide in the metal nanoparticle activated carbon is 1:(1-2):(1-2).
[0016] The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, wherein a first mixture of bio-heavy oil and metal chloride is subjected to a first heating treatment, comprises:
[0017] The temperature of the first mixture of the bio-heavy oil and the metal chloride is heated from 20°C to 30°C to 125°C to 135°C.
[0018] The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, wherein the second mixture obtained by mixing the first product with nano-magnesium oxide is subjected to a second heating treatment, comprises:
[0019] The temperature of the second mixture obtained by mixing the first product with nano-magnesium oxide is heated from 125° C. to 135° C. to 140° C. to 155° C. and kept warm for 0.5 h to 2 h.
[0020] The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, wherein the second product is subjected to a first temperature increase treatment, comprising:
[0021] The temperature of the second product is increased from 20°C to 30°C to 850°C to 950°C at a heating rate of 1°C / min to 5°C / min, and the temperature is maintained for 0.5h to 2h.
[0022] In the method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, the potassium source is potassium hydroxide, and the mass ratio of the potassium hydroxide to the metal nanoparticle carbon material is (0.8-1.2):1.
[0023] In the method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, the temperature of the drying treatment is 70°C to 85°C.
[0024] The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described above, wherein the metal nanoparticle activated carbon precursor is subjected to a second temperature increase treatment, comprising:
[0025] The temperature of the metal nanoparticle activated carbon precursor is increased from 20°C to 30°C to 850°C to 950°C at a heating rate of 5°C / min to 10°C / min, and the temperature is maintained for 0.5h to 2h.
[0026] The second aspect of the present invention provides a metal nanoparticle activated carbon, which is prepared by the method for preparing metal nanoparticle activated carbon with high specific surface area by using biological heavy oil.
[0027] Compared with the prior art, the present invention has at least the following beneficial effects:
[0028] The present invention provides a method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil. The method firstly mixes the bio-heavy oil with metal chloride and then performs a first heating treatment to obtain a first product. Then, the first product is mixed with nano-magnesium oxide and then sequentially subjected to a second heating treatment, a first heating treatment, an impregnation treatment, a drying treatment and a second heating treatment to form metal nanoparticle activated carbon. The metal nanoparticle activated carbon has a porous structure and a high specific surface area (up to 1609m 2 / g). In addition, the raw materials used in this method have the advantages of low cost and wide sources of raw materials. This method has reference significance for the preparation of high specific surface area activated carbon.
[0029] The present invention uses bio-heavy oil as a carbon source, effectively utilizes biomass waste, and realizes a green carbon cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0031] Figure 1is a scanning electron microscope image of the metal nanoparticle activated carbon in Example 1 of the present invention;
[0032] Figure 2 This is a scanning electron microscope image of the metal nanoparticle activated carbon in Example 2 of the present invention;
[0033] Figure 3 This is a scanning electron microscope image of the metal nanoparticle activated carbon in Example 3 of the present invention;
[0034] Figure 4 This is a scanning electron microscope image of the metal nanoparticle activated carbon in the comparative example of the present invention. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0036] Unless otherwise specified, the raw materials and reagents used in the following examples can be obtained from commercial sources; the processes used, unless otherwise specified, are conventional processes in the art.
[0037] It should be noted that the descriptions involving “first”, “second”, “first time”, “second time”, etc. in the present invention are only for descriptive purposes and therefore cannot be understood as limiting the present invention.
[0038] The first aspect of the present invention provides a method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil, characterized by comprising:
[0039] Performing a first heating treatment on a first mixture of the bio-heavy oil and the metal chloride to obtain a first product;
[0040] performing a second heating treatment on a second mixture obtained by mixing the first product with nano-magnesium oxide to obtain a second product;
[0041] performing a first heating treatment on the second product to obtain a metal nanoparticle carbon material;
[0042] After impregnating the metal nanoparticle carbon material with a potassium source solution, the metal nanoparticle activated carbon precursor is obtained through drying.
[0043] performing a second temperature raising treatment on the metal nanoparticle activated carbon precursor to form the metal nanoparticle activated carbon;
[0044] The temperature during the second heat treatment is higher than the temperature during the first heat treatment.
[0045] Specifically, the present invention first mixes bio-heavy oil with metal chloride to obtain a first mixture, performs a first heating treatment on the first mixture to obtain a first product, and the first heating treatment allows the bio-heavy oil and the metal chloride to fully react to form a uniform mixture, and reduces the viscosity of the bio-heavy oil; then the first product is mixed with nano-magnesium oxide to obtain a second mixture, and the second mixture is subjected to a second heating treatment to obtain a second product, and the second heating treatment allows uniformly distributed pores to be formed in the second product, thereby increasing the specific surface area and pore volume of the second product, facilitating the reduction and dispersion of metal ions, forming uniform metal nanoparticles, and facilitating the enhancement of its catalytic activity and electrochemical performance, and the temperature during the second heating treatment is greater than the temperature during the first heating treatment, in order to promote the formation of the second product, and to facilitate the subsequent formation of metal nanoparticle activated carbon; then the second product is subjected to a first heating treatment to obtain a metal nanoparticle carbon material, and the second product is subjected to a second ... The first temperature treatment further carbonizes the organic components in the second product to form a stable metal nanoparticle carbon material with a carbon-based structure; the metal nanoparticle carbon material is then impregnated with a potassium source solution to obtain a metal nanoparticle activated carbon precursor, and the metal nanoparticle activated carbon precursor is then dried, and potassium hydroxide (KOH) is used as an alkaline activator to further etch the metal nanoparticle carbon material through the impregnation treatment to increase its pore structure and specific surface area to form a richer pore structure, and the water or other solvents introduced during the impregnation treatment are removed through the drying treatment to prevent them from affecting the structure of the final prepared material during the subsequent second temperature treatment; the metal nanoparticle activated carbon precursor is subjected to a second temperature treatment to form metal nanoparticle activated carbon, and the pore structure of the material is further enhanced through the second temperature treatment to increase the specific surface area, which is conducive to obtaining metal nanoparticle activated carbon with a porous structure and a high specific surface area.
[0046] The present invention does not particularly limit the specific sources or specific preparation methods of the raw materials for preparing the metal nanoparticle activated carbon. The raw materials can be purchased through commercial channels or prepared by methods well known in the art.
[0047] The present invention does not particularly limit the specific equipment used for the first heating treatment, the second heating treatment, the first temperature rise treatment, and the second temperature rise treatment, and can be selected according to actual needs. For example, an oil bath can be used for the first heating treatment, an oil bath can be used for the second heating treatment, a graphite boat can be used for the first temperature rise treatment, and a graphite boat can be used for the second temperature rise treatment.
[0048] The present invention uses biomass heavy oil, which is a cheap and abundant source of biomass material, as a raw material, and uses the above method to prepare the above metal nanoparticle activated carbon, which has a porous structure and a high specific surface area. The method is simple in process and suitable for wide promotion and application.
[0049] In a specific embodiment, the metal chloride is any one of nickel chloride, magnesium chloride and copper chloride, preferably nickel chloride.
[0050] When the above-mentioned substance is a metal chloride, it is beneficial to prepare metal nanoparticle activated carbon with a porous structure and a high specific surface area.
[0051] In a specific embodiment, in the above-mentioned metal nanoparticle activated carbon, the mass ratio of bio-heavy oil, metal chloride and nano-magnesium oxide is 1:(1-2):(1-2), and the mass ratio of bio-heavy oil, metal chloride and nano-magnesium oxide may preferably be 1:2:2.
[0052] When the mass ratio of bio-heavy oil, metal chloride and nano-magnesium oxide in the metal nanoparticle activated carbon is within the above range, it is beneficial to prepare metal nanoparticle activated carbon with a porous structure and a high specific surface area.
[0053] In a specific embodiment, the first heating treatment of the first mixture after the bio-heavy oil and the metal chloride are mixed includes: heating the temperature of the first mixture after the bio-heavy oil and the metal chloride are mixed from 20° C. to 30° C. to 125° C. to 135° C. Specifically, after the bio-heavy oil and the metal chloride are mixed to obtain the first mixture, the temperature of the first mixture before the first heating treatment is generally room temperature, that is, 20° C. to 30° C., and after the first heating treatment, the temperature of the first mixture is 125° C. to 135° C.
[0054] In a specific embodiment, the second heating treatment of the second mixture after the first product and the nano-magnesium oxide are mixed includes: heating the temperature of the second mixture after the first product and the nano-magnesium oxide are mixed from 125°C to 135°C to 140°C to 155°C and keeping it warm for 0.5h to 2h. Specifically, after the first product and the nano-magnesium oxide are mixed to obtain the second mixture, the second mixture is further heated to 140°C to 155°C on the basis of the first heating treatment, and kept warm at a temperature of 140°C to 155°C for 0.5h to 2h.
[0055] In a specific embodiment, the first heating treatment of the second product comprises:
[0056] The temperature of the second product is raised from 20°C to 30°C to 850°C to 950°C at a heating rate of 1°C / min to 5°C / min, and the temperature is maintained for 0.5h to 2h. Specifically, before the first heating treatment, the temperature of the second product is generally at room temperature, i.e., 20°C to 30°C, and then the temperature of the second product is raised from 20°C to 30°C to 850°C to 950°C at a heating rate of 1°C / min to 5°C / min, and maintained at 850°C to 950°C for 0.5h to 2h.
[0057] In a specific embodiment, the potassium source is potassium hydroxide, and the mass ratio of potassium hydroxide to the metal nanoparticle carbon material is (0.8-1.2):1. The mass ratio of potassium hydroxide to the metal nanoparticle carbon material may preferably be 1:1.
[0058] When the parameters of the mass ratio of potassium hydroxide to metal nanoparticle carbon material are within the above range, it is beneficial to further etch the metal nanoparticle carbon material through impregnation treatment, increase its pore structure and specific surface area, and form a richer pore structure, which is beneficial to the subsequent preparation of metal nanoparticle activated carbon with a porous structure and a high specific surface area.
[0059] Illustratively, the mass ratio of potassium hydroxide to the metal nanoparticle carbon material may be any one of 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, or any two of them.
[0060] In a specific embodiment, the temperature of the drying process is 70°C to 85°C.
[0061] When the parameters of the temperature and time of the drying treatment are respectively within the above ranges, the water or other solvents introduced during the impregnation treatment can be fully removed, which is beneficial to the subsequent preparation of metal nanoparticle activated carbon with a porous structure and a high specific surface area.
[0062] In a specific embodiment, the second heating treatment of the metal nanoparticle activated carbon precursor comprises:
[0063] The temperature of the metal nanoparticle activated carbon precursor is raised from 20°C to 30°C to 850°C to 950°C at a heating rate of 5°C / min to 10°C / min, and the temperature is maintained for 0.5 to 2 hours. Specifically, before the second heating treatment, the temperature of the metal nanoparticle activated carbon precursor is generally at room temperature, i.e., 20°C to 30°C, and then the temperature of the metal nanoparticle activated carbon precursor is raised from 20°C to 30°C to 850°C to 950°C at a heating rate of 5°C / min to 10°C / min, and the temperature is maintained for 0.5h to 2h.
[0064] The second aspect of the present invention provides a metal nanoparticle activated carbon, which is prepared by the above-mentioned method for preparing metal nanoparticle activated carbon with high specific surface area using biological heavy oil. Therefore, the metal nanoparticle activated carbon has a porous structure and a high specific surface area.
[0065] The present invention is further described below through specific embodiments.
[0066] Example 1
[0067] This embodiment provides a method for preparing metal nanoparticle activated carbon, comprising:
[0068] Using an oil bath, heating a first mixture of 1 g of bio-heavy oil and 1 g of nickel chloride from 25° C. to 130° C. to perform a first heating treatment to obtain a first product;
[0069] The temperature of the second mixture obtained by mixing the first product with 2g of nano-magnesium oxide is further heated from 130°C to 150°C and kept at 150°C for 1h for a second heating treatment, and then naturally cooled to room temperature (25°C) to obtain a second product;
[0070] The second product was moved into a graphite boat, and the temperature of the second product was increased from 25°C to 900°C at a heating rate of 2°C / min under a nitrogen atmosphere, and the temperature was maintained at 900°C for 1 hour for the first heating treatment, and the metal nanoparticle carbon material was obtained after naturally cooling to room temperature (25°C);
[0071] The metal nanoparticle carbon material is impregnated with a potassium hydroxide solution, dried at 80°C, and naturally cooled to room temperature (25°C) to obtain a metal nanoparticle activated carbon precursor; the mass ratio of potassium hydroxide to the metal nanoparticle carbon material in the potassium hydroxide solution is 1:1;
[0072] The metal nanoparticle activated carbon precursor was moved into a graphite boat. Under a nitrogen atmosphere, the temperature of the metal nanoparticle activated carbon precursor was increased from 25°C to 900°C at a heating rate of 5°C / min, and the temperature was maintained at 900°C for 1 hour for a second heating treatment. After naturally cooling to room temperature, metal nanoparticle activated carbon was obtained.
[0073] Example 2
[0074] The preparation method of the metal nanoparticle activated carbon provided in this embodiment is basically the same as that in embodiment 1, except that:
[0075] Replace 1g of nickel chloride with 2g of nickel chloride, and replace 2g of nano-magnesium oxide with 1g of nano-magnesium oxide.
[0076] Example 3
[0077] The preparation method of the metal nanoparticle activated carbon provided in this embodiment is basically the same as that in embodiment 1, except that:
[0078] Replace 1g of nickel chloride with 2g of nickel chloride.
[0079] Example 4
[0080] The preparation method of the metal nanoparticle activated carbon provided in this embodiment is basically the same as that in embodiment 1, except that:
[0081] Replace 1g of nickel chloride with 1g of magnesium chloride.
[0082] Example 5
[0083] The preparation method of the metal nanoparticle activated carbon provided in this embodiment is basically the same as that in embodiment 1, except that:
[0084] Replace 1g of nickel chloride with 1g of copper chloride.
[0085] Comparative Example (without adding nano magnesium oxide)
[0086] This comparative example provides a method for preparing metal nanoparticle activated carbon, comprising:
[0087] Using an oil bath, heating a first mixture of 1 g of bio-heavy oil and 1 g of nickel chloride from 25° C. to 130° C. to perform a first heating treatment to obtain a first product;
[0088] The temperature of the first product is further heated from 130° C. to 150° C. and kept at 150° C. for 1 hour for a second heating treatment, and then naturally cooled to room temperature (25° C.) to obtain a second product;
[0089] The second product was moved into a graphite boat, and the temperature of the second product was increased from 25°C to 900°C at a heating rate of 2°C / min under a nitrogen atmosphere, and the temperature was maintained at 900°C for 1 hour for the first heating treatment, and the metal nanoparticle carbon material was obtained after naturally cooling to room temperature (25°C);
[0090] The metal nanoparticle carbon material is impregnated with a potassium hydroxide solution, dried at 80°C, and naturally cooled to room temperature (25°C) to obtain a metal nanoparticle activated carbon precursor; the mass ratio of potassium hydroxide to the metal nanoparticle carbon material in the potassium hydroxide solution is 1:1;
[0091] The metal nanoparticle activated carbon precursor was moved into a graphite boat. Under a nitrogen atmosphere, the temperature of the metal nanoparticle activated carbon precursor was increased from 25°C to 900°C at a heating rate of 5°C / min, and the temperature was maintained at 900°C for 1 hour for a second heating treatment. After naturally cooling to room temperature, metal nanoparticle activated carbon was obtained.
[0092] Performance Testing
[0093] 1. Morphology test
[0094] The metal nanoparticle activated carbon in Examples 1 to 3 and the comparative example was tested by scanning electron microscope (SEM). Figure 1 is a scanning electron microscope image of the metal nanoparticle activated carbon in Example 1 of the present invention; Figure 2 This is a scanning electron microscope image of the metal nanoparticle activated carbon in Example 2 of the present invention; Figure 3 This is a scanning electron microscope image of the metal nanoparticle activated carbon in Example 3 of the present invention; Figure 4 This is a scanning electron microscope image of the metal nanoparticle activated carbon in the comparative example of the present invention.
[0095] Depend on Figure 1 It can be seen that the metal nanoparticle activated carbon in Example 1 of the present invention has fine particles, and its surface shows a finer porous structure. This finer porous structure helps to increase the specific surface area of the metal nanoparticle activated carbon.
[0096] Depend on Figure 2 It can be seen that the metal nanoparticle activated carbon in Example 2 of the present invention has an unconventional flaky or layered structure, there are large and numerous pore structures between the layered structures, and the surface is rough and uneven, which helps to increase the specific surface area of the metal nanoparticle activated carbon.
[0097] Depend on Figure 3 It can be seen that the metal nanoparticle activated carbon in Example 3 of the present invention has a complex porous structure, the surface has a porous structure, the size and distribution of the pore structure are uneven, and the diversity of these pore structures helps the metal nanoparticle activated carbon to have a high specific surface area and high pore volume.
[0098] Depend on Figure 4 It can be seen that the surface of the metal nanoparticle activated carbon in the comparative example of the present invention has obvious cracks and irregular structures, the surface is relatively rough, and the pore structure is less.
[0099] In summary, the metal nanoparticle activated carbon provided in the embodiments of the present invention has a porous structure, which helps to increase the specific surface area of the metal nanoparticle activated carbon.
[0100] 2. Specific surface area test
[0101] The following tests were performed on the metal nanoparticle activated carbon in Examples 1 to 5 and the comparative example, and the test results are shown in Table 1;
[0102] (1) Total specific surface area (m 2 / g): First, the metal nanoparticle activated carbon (sample) was subjected to vacuum degassing and dehydration treatment at 40°C for 12 hours to ensure that the moisture and organic impurities in the sample were fully removed; after the vacuum degassing and dehydration treatment, a liquid nitrogen automatic adsorption instrument was used to perform nitrogen adsorption measurement at 77K. The specific operations included: the sample after vacuum degassing and dehydration treatment was evenly loaded into the adsorption tube to ensure that there was no accumulation or pore blockage; then, high-purity nitrogen was slowly introduced at different relative pressures, the adsorption amount data at each pressure point was recorded to obtain the nitrogen adsorption isotherm data, and the nitrogen adsorption isotherm was drawn; finally, the BET equation was used to perform linear fitting to calculate the total specific surface area of the sample.
[0103] (2) Internal specific surface area (m 2 / g): t-Plot analysis is performed using the above-mentioned nitrogen adsorption isotherm data to distinguish between the internal specific surface area and the external specific surface area; based on the obtained nitrogen adsorption isotherm data, a t-Plot diagram is plotted, wherein the adsorption amount (W) divided by the monolayer adsorption amount (W0) is used as the ordinate, and t (defined as t = (P / P0) / [1-(P / P0)], wherein P represents the actual pressure and P0 represents the saturated vapor pressure of nitrogen) is used as the abscissa; in the low relative pressure region, the t-Plot diagram presents a linear relationship, and the internal specific surface area can be determined by linearly fitting the data in the linear relationship region.
[0104] (3) External specific surface area (m 2 / g): Use the formula "external specific surface area = total specific surface area - internal specific surface area".
[0105] Table 1 Test results
[0106] project <![CDATA[Total specific surface area (m 2 / g)]]> <![CDATA[Internal specific surface area (m 2 / g)]]> <![CDATA[External specific surface area (m 2 / g)]]> Example 1 956.40 677.20 279.20 Example 2 770.90 516.30 254.60 Example 3 1609.50 1296.30 313.20 Example 4 923.90 659.30 264.60 Example 5 911.20 655.90 255.30 Comparative Example 20.50 13.0 7.5
[0107] As shown in Table 1, the metal nanoparticle activated carbon prepared in Examples 1 to 5 of the present invention has the advantage of high specific surface area, and the total specific surface area can reach up to 1609.50 m 2 / g. By comparing Example 1 with Example 3, it can be seen that when the mass ratio of bio-heavy oil, nickel chloride and nano-magnesium oxide is 1:2:2, the total specific surface area of the metal nanoparticle activated carbon is significantly improved. By comparing Example 1 with the comparative example, it can be seen that when nano-magnesium oxide is not added, the total specific surface area of the metal nanoparticle activated carbon is significantly reduced.
[0108] In summary, the metal nanoparticle activated carbon prepared in the embodiment of the present invention has the advantages of a porous structure and a high total specific surface area, which shows that the method of the present invention can be used to prepare metal nanoparticle activated carbon with a porous structure and a high specific surface area.
[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil, characterized in that: include: Performing a first heating treatment on a first mixture of bio-heavy oil and metal chloride to obtain a first product; performing a second heating treatment on a second mixture obtained by mixing the first product with nano-magnesium oxide to obtain a second product; performing a first heating treatment on the second product to obtain a metal nanoparticle carbon material; After impregnating the metal nanoparticle carbon material with a potassium source solution, the metal nanoparticle activated carbon precursor is obtained by drying. Performing a second temperature raising treatment on the metal nanoparticle activated carbon precursor to form the metal nanoparticle activated carbon; The temperature during the second heat treatment is higher than the temperature during the first heat treatment.
2. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The metal chloride is any one of nickel chloride, magnesium chloride and copper chloride.
3. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: In the metal nanoparticle activated carbon, the mass ratio of the bio-heavy oil, the metal chloride and the nano-magnesium oxide is 1:(1-2):(1-2).
4. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The first mixture of the bio-heavy oil and the metal chloride is subjected to a first heating treatment, comprising: The temperature of the first mixture of the bio-heavy oil and the metal chloride is heated from 20°C to 30°C to 125°C to 135°C.
5. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The second mixture formed by mixing the first product with nano-magnesium oxide is subjected to a second heating treatment, comprising: The temperature of the second mixture obtained by mixing the first product with nano-magnesium oxide is heated from 125° C. to 135° C. to 140° C. to 155° C. and kept warm for 0.5 h to 2 h.
6. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The second product is subjected to a first temperature raising treatment, comprising: The temperature of the second product is increased from 20°C to 30°C to 850°C to 950°C at a heating rate of 1°C / min to 5°C / min, and the temperature is maintained for 0.5h to 2h.
7. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The potassium source is potassium hydroxide, and the mass ratio of the potassium hydroxide to the metal nanoparticle carbon material is (0.8-1.2):
1.
8. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The temperature of the drying process is 70°C to 85°C.
9. The method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil according to claim 1, characterized in that: The metal nanoparticle activated carbon precursor is subjected to a second temperature raising treatment, comprising: The temperature of the metal nanoparticle activated carbon precursor is increased from 20°C to 30°C to 850°C to 950°C at a heating rate of 5°C / min to 10°C / min, and the temperature is maintained for 0.5h to 2h.
10. A metal nanoparticle activated carbon, characterized in that: The carbon is prepared by the method for preparing high specific surface area metal nanoparticle activated carbon using bio-heavy oil as described in any one of claims 1 to 9.