Activated carbon particles, and methods of making and using the same

Abstract

The application provides an activated carbon particle and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dispersing a low-melting-point metal in a solvent, performing ultrasonic treatment to obtain nano metal particles; (2) mixing a ligand and the nano metal particles in step (1) and stirring to obtain surface-modified phase-change nano metal; (3) dispersing activated carbon powder, a binder and the surface-modified phase-change nano metal in step (2) in water, and sequentially performing shaping and drying to obtain the activated carbon particle. The surface-modified phase-change nano metal is added in the shaping process of the activated carbon powder, the surface-modified micro-nano metal particles control the thermal effect of the system in the adsorption-desorption process through phase change, so that the adsorption-desorption performance of the whole material is improved, and the surface-modified phase-change nano metal has the characteristics of a stable surface and uniform dispersion in the internal structure of the activated carbon material.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of activated carbon adsorption technology, and particularly relates to an activated carbon particle and a preparation method and application thereof. BACKGROUND

[0002] Due to the high volatility of fuel oil, in order to prevent fuel waste and pollute the atmosphere and environment, currently, materials such as activated carbon are mainly used for adsorption treatment of fuel oil vapor, and the adsorbed fuel oil is desorbed into the system for combustion when the power system is working. In the adsorption-desorption process, the thermal effect is an important factor affecting the overall efficiency of the recovery system. When fuel oil vapor is adsorbed, heat is released, causing the temperature of the adsorption bed to rise, hindering the adsorption process; when desorbed, the fuel oil vapor absorbs heat, causing the temperature of the adsorption bed to drop, and the desorption capacity also decreases accordingly. Adding a phase change heat storage material to the adsorption system to offset the thermal effect in the adsorption-desorption process is an ideal scheme to improve the adsorption-desorption efficiency.

[0003] Low-melting-point metal alloys are applied to various heat storage and energy storage scenarios due to their unique physical properties. CN112604614A discloses a preparation method of a low-temperature mixed alkane phase change microcapsule modified by a nanomaterial, which uses low-temperature 18% C14 mixed alkane as a low-temperature phase change material to prepare a low-temperature phase change microcapsule with melamine formaldehyde as a wall material. At the same time, carbon nanotubes and nano-aluminum oxide are added for double reinforcement of the shell and core materials of the microcapsule, including the following steps: (1) preparation of phase change microcapsules by mixing hydrophilic emulsifier sodium dodecyl sulfate, lipophilic emulsifier, and Tween80 as a complex emulsifier; (2) preparation of nano-aluminum oxide modified phase change microcapsules; (3) preparation of carbon nanotube modified phase change microcapsules; (4) preparation of low-temperature phase change microcapsules modified by nano-aluminum oxide and carbon nanotubes.

[0004] Since low-melting-point metal alloys tend to aggregate into larger aggregates after melting, they often need to be made into microcapsule form for use. However, this technology has the disadvantages of a complicated synthesis process of alloy microcapsules, and the organic polymer shell is difficult to integrate with commonly used activated carbon adsorption materials, resulting in the deposition of the microcapsules at the bottom of the container under the influence of gravity.

[0005] Therefore, it is necessary to develop a phase change material based on low-melting-point metal alloys that is easy to combine with activated carbon, so as to regulate the thermal effect of the system during the adsorption-desorption process and improve the overall adsorption-desorption performance of the material. SUMMARY

[0006] The present application aims to provide an activated carbon particle and a preparation method and application thereof, wherein a surface-modified phase-change nano metal is added in the activated carbon powder forming process, the surface-modified micro-nano metal particles control the thermal effect of the system in the adsorption-desorption process through phase change, thereby improving the overall adsorption-desorption performance of the material, and the surface-modified phase-change nano metal has the characteristics of stable surface and uniform dispersion in the internal structure of the activated carbon material.

[0007] To achieve the object of the present application, the following technical solutions are adopted:

[0008] In a first aspect, the present application provides a preparation method of an activated carbon particle, which comprises the following steps:

[0009] (1) dispersing a low-melting-point metal in a solvent, and performing ultrasonic treatment to obtain nano metal particles;

[0010] (2) mixing a ligand and the nano metal particles of step (1), and performing stirring to obtain surface-modified phase-change nano metal;

[0011] (3) dispersing activated carbon powder, a binder and the surface-modified phase-change nano metal of step (2) in water, and sequentially performing forming and drying to obtain the activated carbon particle.

[0012] In the present application, a low-melting-point metal block is dispersed into micro-nano particles in a dispersion medium through ultrasonic treatment, and a special ligand is assembled on the surface layer to obtain surface-modified phase-change nano metal units, then the surface-modified phase-change nano metal is added in the activated carbon powder forming process, and the surface-modified micro-nano metal particles control the thermal effect of the system in the adsorption-desorption process through phase change, thereby improving the overall adsorption-desorption performance of the material.

[0013] The surface-modified phase-change nano metal of the present application has a stable surface and can be uniformly dispersed in the internal structure of the activated carbon powder material.

[0014] As a preferred technical solution of the present application, the low-melting-point metal of step (1) includes any one or a combination of at least two of gallium, gallium-indium alloy (75:25), gallium-indium-tin alloy (68.5:21.5:10), bismuth-indium-tin-lead alloy (49:21:12:18) or indium-tin-bismuth alloy (51:32.5:16.5), wherein the combination is typically but not limited to: a combination of gallium and gallium-indium alloy, a combination of gallium-indium-tin alloy and bismuth-indium-tin-lead alloy, or a combination of bismuth-indium-tin-lead alloy and indium-tin-bismuth alloy, etc.

[0015] In the present application, the melting point of gallium-indium-tin alloy is the lowest, about 10-15℃, due to the size effect of nanoparticles on the melting point, the actual phase transition temperature of indium-tin alloy after testing is about 20℃, the melting point of gallium metal is about 30℃, the melting point of gallium-indium alloy is about 25℃, the melting point of bismuth-indium-tin-lead alloy is 58℃, and the melting point of indium-tin-bismuth alloy is about 63℃.

[0016] Preferably, the solvent in step (1) includes any one or a combination of at least two of water, glycerol, PEG200 or PEG400, wherein the combination is typically but not limited to: a combination of water and glycerol, a combination of glycerol and PEG200, or a combination of PEG200 and PEG400, etc.

[0017] Preferably, the solid-liquid ratio of the low-melting-point metal and the solvent in step (1) is 1:(8-12) g / mL, for example, it can be 1:8.5 g / mL, 1:9 g / mL, 1:9.5 g / mL, 1:10 g / mL, 1:10.5 g / mL, 1:11 g / mL or 1:11.5 g / mL, etc., but not limited to the listed values, other values not listed within the value range are also applicable.

[0018] As a preferred technical solution of the present application, the frequency of the ultrasound in step (1) is 25-35 Hz, for example, it can be 26 Hz, 27 Hz, 28 Hz, 29 Hz, 30 Hz, 31 Hz, 32 Hz, 33 Hz or 34 Hz, etc., but not limited to the listed values, other values not listed within the value range are also applicable.

[0019] Preferably, the power of the ultrasound in step (1) is 110-130 W, for example, it can be 112 W, 115 W, 117 W, 120 W, 122 W, 125 W, 127 W or 129 W, etc., but not limited to the listed values, other values not listed within the value range are also applicable.

[0020] Preferably, the temperature of the ultrasound in step (1) is 30-70℃, for example, it can be 32℃, 35℃, 37℃, 40℃, 45℃, 50℃, 55℃, 60℃ or 65℃, etc., but not limited to the listed values, other values not listed within the value range are also applicable.

[0021] In the present application, when the low-melting-point metal in step (1) is gallium, gallium-indium alloy or gallium-indium-tin alloy, the temperature of the ultrasound is 30-40℃.

[0022] In the present application, when the low-melting-point metal in step (1) is bismuth-indium-tin-lead alloy or indium-tin-bismuth alloy, the temperature of the ultrasound is 60-70℃.

[0023] Preferably, the time of the ultrasonic in step (1) is 0.5-2h, for example, it can be 0.7h, 0.9h, 1h, 1.2h, 1.4h, 1.5h, 1.7h or 1.9h, etc., but not limited to the listed values, other values not listed in the range of values are also applicable, preferably 1-2h.

[0024] As a preferred technical solution of the present application, the particle size of the nano metal particles in step (1) is 100-300nm, for example, it can be 120nm, 150nm, 170nm, 200nm, 220nm, 250nm, 270nm or 290nm, etc., but not limited to the listed values, other values not listed in the range of values are also applicable.

[0025] As a preferred technical solution of the present application, the ligand in step (2) includes any one or a combination of at least two of γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane or bis-[γ-(triethoxysil)propyl]tetrasulfide.

[0026] The sulfur-containing functional group in the ligand in step (2) of the present application can fix the liquid metal nanoparticles, and at the same time form a sulfide layer on the metal surface to stabilize its chemical properties. The silicon-containing functional group in the ligand helps the ligand interact with the silicon-containing binder, thereby anchoring the metal to the binder. Other functional groups in the ligand anchor the active carbon particles or the binder without silicon, thereby fixing the metal nanoparticles well in the active carbon system.

[0027] It is worth noting that the ligand is easy to bind to the metal surface layer, passivate the surface layer, and prevent the metal nanoparticles from fusing into large balls. In addition, it has adhesion to most organic and inorganic materials, can fix the metal nanoparticles in the binder, and prevent them from depositing at the bottom due to their high density.

[0028] Preferably, the mass ratio of the ligand to the low-melting metal in step (2) is 1:(0.1-100), for example, it can be 1:1, 1:3, 1:5, 1:10, 1:20, 1:30, 1:50, 1:70 or 1:90, etc., but not limited to the listed values, other values not listed in the range of values are also applicable, preferably 1:(8-12).

[0029] Preferably, the mixing in step (2) further includes adding a magnetic material.

[0030] Preferably, the mass ratio of the ligand to the magnetic material is 1:(0.1-0.5), for example, it can be 1:0.15, 1:0.2, 1:0.25, 1:0.3, 1:0.35, 1:0.4 or 1:0.45, etc., but not limited to the listed values, other values not listed in the range of values are also applicable.

[0031] Preferably, the magnetic material comprises nano Fe3O4 and / or nano γ-Fe2O3 powder.

[0032] The present application makes the surface modified phase change nanometal magnetic by adding magnetic material, which is convenient for recycling. Since the cost of metal nanoparticles is relatively high, recycling is considered to balance the cost. The activated carbon loaded with alloy nanoparticles can be dispersed in water after crushing, and the surface magnetic phase change nanometal can be adsorbed on the surface of the magnet by using a strong magnet.

[0033] As a preferred technical solution of the present application, the temperature of the stirring in step (2) is 10-30℃, for example, it can be 12℃, 14℃, 15℃, 16℃, 18℃, 20℃, 22℃, 24℃, 25℃, 26℃ or 28℃, but not limited to the listed values, other values not listed in the value range are also applicable.

[0034] Preferably, the stirring time in step (2) is 8-15min, for example, it can be 9min, 10min, 11min, 12min, 13min or 14min, but not limited to the listed values, other values not listed in the value range are also applicable.

[0035] As a preferred technical solution of the present application, the mass ratio of the activated carbon powder and the binder to the total mass of the surface modified phase change nanometal in step (3) is 90:10-95:5, for example, it can be 91:9, 92:8, 93:7 or 94:6, but not limited to the listed values, other values not listed in the value range are also applicable.

[0036] Preferably, the mass ratio of the surface modified phase change nanometal and the binder in step (3) is 1:(1.5-4), for example, it can be 1:1.7, 1:2, 1:2.5, 1:3 or 1:3.5, but not limited to the listed values, other values not listed in the value range are also applicable.

[0037] Preferably, the binder comprises any one or a combination of at least two of water glass, clay, wood tar or phenolic resin.

[0038] As a preferred technical solution of the present application, the preparation method comprises the following steps:

[0039] (1) dispersing a low-melting-point metal in a solvent, and performing ultrasonic treatment at a frequency of 25-35Hz, a power of 110-130W and a temperature of 30-70℃ for 0.5-2h to obtain nanometal particles with a particle size of 100-300nm;

[0040] The low-melting-point metal includes any one of gallium, gallium-indium alloy, gallium-indium-tin alloy, bismuth-indium-tin-lead alloy, or indium-tin-bismuth alloy, or a combination of at least two of them; and the solvent includes any one of water, glycerol, PEG 200, or PEG 400, or a combination of at least two of them.

[0041] (2) mixing the ligand and the nano-metal particles in step (1) and stirring at a temperature of 10-30 DEG C for 8-15 min to obtain surface-modified phase-change nano-metal;

[0042] The ligand includes any one of gamma-mercaptopropyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, or bis-[gamma-(triethoxysil)propyl]tetrasulfide, or a combination of at least two of them; and the mass ratio of the ligand to the low-melting-point metal is 1:(0.1-100).

[0043] (3) dispersing the activated carbon powder, the binder, and the surface-modified phase-change nano-metal in step (2) in water, and sequentially performing molding and drying to obtain the activated carbon particles;

[0044] The mass ratio of the activated carbon powder to the total mass of the binder and the surface-modified phase-change nano-metal is 90:10-95:5; and the mass ratio of the surface-modified phase-change nano-metal to the binder is 1:(1.5-4).

[0045] In a second aspect, the present application provides an activated carbon particle prepared by the method in the first aspect.

[0046] In a third aspect, the present application provides an application of the activated carbon particle in the second aspect, and the activated carbon particle is used for fuel vapor adsorption.

[0047] The numerical range in the present application includes not only the point values listed above, but also any point values between the above numerical ranges that are not listed, and the present application does not list the specific point values included in the range for the sake of brevity and simplicity.

[0048] Compared with the prior art, the present application has the following beneficial effects:

[0049] (1) The preparation method in the present application disperses the low-melting-point metal block into micro-nano particles in a dispersion medium by ultrasonic, and assembles a special ligand on the surface layer to obtain a surface-modified phase-change nano-metal unit, and then the surface-modified phase-change nano-metal is added in the activated carbon powder molding process, and the surface-modified micro-nano metal particles control the thermal effect of the system in the adsorption-desorption process through phase change, thereby improving the overall adsorption-desorption performance of the material, and the present application can be applied to the field of fuel vapor recovery.

[0050] (2) The surface modified phase change nanometer metal surface is stable and can be uniformly dispersed in the structure of the activated carbon powder material, and by adding the phase change nanometer metal in the forming process of the activated carbon, the butane adsorption and desorption capacity is increased by more than 10%.

[0051] (3) The preparation method is simple, the performance of the adsorption material is obviously improved, and the application value is high. DETAILED DESCRIPTION

[0052] The technical solutions of the present application will be further described through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application, and should not be regarded as specific limitations on the present application.

[0053] Example 1

[0054] The present embodiment provides a preparation method of activated carbon particles, which comprises the following steps:

[0055] (1) 10g of gallium metal is dispersed in 100mL of distilled water, ultrasonic treatment is carried out at a frequency of 30Hz, a power of 120W and a temperature of 30℃ for 1h, and nanometer metal particles with a particle size of 100-300nm are obtained;

[0056] (2) 1g of γ-mercaptopropyltrimethoxysilane, 0.2g of nanometer γ-Fe2O3 powder and the nanometer metal particles in step (1) are mixed, stirring is carried out at a temperature of 10℃ for 10min, and after centrifugation, the surface modified phase change nanometer metal is obtained;

[0057] (3) 90g of activated carbon powder, 4g of the surface modified phase change nanometer metal in step (2) and 6g of water glass are dispersed and mixed in water, and then forming and drying are sequentially carried out, and the activated carbon particles are obtained.

[0058] Example 2

[0059] The present embodiment provides a preparation method of activated carbon particles, which comprises the following steps:

[0060] Example 3

[0061] The present embodiment provides a preparation method of activated carbon particles, which comprises the following steps:

[0062] Example 4

[0063] The embodiment provides a preparation method of activated carbon particles, and the preparation method comprises the following steps:

[0064] (1) dispersing 10 g of gallium indium alloy in 100 mL of distilled water, performing ultrasonic treatment at a frequency of 30 Hz, a power of 120 W and a temperature of 30 DEG C for 1 h to obtain nano metal particles with a particle size of 100-300 nm;

[0065] (2) mixing 1 g of bis-[gamma-(triethoxysilyl) propyl] tetrasulfide, 0.2 g of nano Fe3O4 and the nano metal particles in step (1), stirring at a temperature of 10 DEG C for 10 min, and centrifuging to obtain surface-modified phase-change nano metal;

[0066] (3) dispersing and mixing 90 g of activated carbon powder, 4 g of the surface-modified phase-change nano metal in step (2) and 6 g of water glass in water, and sequentially performing shaping and drying to obtain the activated carbon particles.

[0067] Example 5

[0068] The embodiment provides a preparation method of activated carbon particles, and the preparation method comprises the following steps:

[0069] (1) dispersing 10 g of gallium metal in 100 mL of distilled water, performing ultrasonic treatment at a frequency of 25 Hz, a power of 110 W and a temperature of 40 DEG C for 2 h to obtain nano metal particles with a particle size of 100-300 nm;

[0070] (2) mixing 1.2 g of gamma-mercaptopropyl trimethoxysilane, 0.2 g of nano gamma-Fe2O3 powder and the nano metal particles in step (1), stirring at a temperature of 30 DEG C for 10 min, and centrifuging to obtain surface-modified phase-change nano metal;

[0071] (3) dispersing and mixing 90 g of activated carbon powder, 3 g of the surface-modified phase-change nano metal in step (2) and 7 g of water glass in water, and sequentially performing shaping and drying to obtain the activated carbon particles.

[0072] Example 6

[0073] The embodiment provides a preparation method of activated carbon particles, and the preparation method comprises the following steps:

[0074] (1) dispersing 10 g of gallium metal in 100 mL of distilled water, performing ultrasonic treatment at a frequency of 35 Hz, a power of 130 W and a temperature of 35 DEG C for 1.5 h to obtain nano metal particles with a particle size of 100-300 nm;

[0075] (2) mixing 0.9 g of γ-mercaptopropyl triethoxysilane, 0.2 g of nano γ-Fe2O3 powder and the nano metal particles in step (1), stirring at a temperature of 15°C for 8 min, and obtaining the surface-modified phase-change nano metal after centrifugation;

[0076] (3) mixing 90 g of activated carbon powder, 2 g of the surface-modified phase-change nano metal in step (2) and 8 g of water glass in water, and sequentially performing molding and drying to obtain the activated carbon particles.

[0077] Example 7

[0078] The present example provides a preparation method of activated carbon particles, wherein the temperature of the ultrasonic treatment in step (1) is 20°C, and other conditions are the same as those in Example 2.

[0079] Example 8

[0080] The present example provides a preparation method of activated carbon particles, wherein the temperature of the ultrasonic treatment in step (1) is 80°C, and other conditions are the same as those in Example 1.

[0081] Example 9

[0082] The present example provides a preparation method of activated carbon particles, wherein the time of the ultrasonic treatment in step (1) is 10 min, and other conditions are the same as those in Example 1.

[0083] Example 10

[0084] The present example provides a preparation method of activated carbon particles, wherein the amount of γ-mercaptopropyl trimethoxysilane in step (2) is 0.1 g, and other conditions are the same as those in Example 1.

[0085] Example 11

[0086] The present example provides a preparation method of activated carbon particles, wherein the amount of γ-mercaptopropyl trimethoxysilane in step (2) is 100 g, and other conditions are the same as those in Example 1.

[0087] Example 12

[0088] The present example provides a preparation method of activated carbon particles, wherein the temperature of the stirring in step (2) is 50°C, and other conditions are the same as those in Example 1.

[0089] Example 13

[0090] The present example provides a preparation method of activated carbon particles, wherein the amount of the surface-modified phase-change nano metal and the water glass in step (3) is 5 g, and other conditions are the same as those in Example 1.

[0091] Example 14

[0092] This example provides a preparation method of activated carbon particles, wherein the amount of the surface-modified phase-change nanometal in step (3) is 1 g, the amount of water glass is 9 g, and other conditions are the same as those in Example 1.

[0093] Comparative Example 1

[0094] This comparative example provides a preparation method of activated carbon particles, wherein the "γ-mercaptopropyltrimethoxysilane" in step (1) is replaced by "γ-aminopropyltriethoxysilane", and other conditions are the same as those in Example 1.

[0095] Comparative Example 2

[0096] This comparative example provides a preparation method of activated carbon particles, which comprises the following steps:

[0097] (1) 10 g of gallium metal, 1 g of γ-mercaptopropyltrimethoxysilane, and 0.2 g of nanometer γ-Fe2O3 powder are dispersed in 100 mL of distilled water, and ultrasonic treatment is performed at a frequency of 30 Hz, a power of 120 W, and a temperature of 30°C for 1 h to obtain surface-modified phase-change nanometal with a particle size of 300 nm-1 μm;

[0098] (2) 90 g of activated carbon powder, 4 g of the surface-modified phase-change nanometal in step (1), and 6 g of water glass are dispersed and mixed in water, and then molding and drying are sequentially performed to obtain the activated carbon particles.

[0099] The activated carbon particles prepared in the above examples and comparative examples are used as an experimental group, and butane adsorption-desorption tests are performed to determine the actual butane working capacity (denoted as BWC1), and the activated carbon particles prepared in step (3) of the above examples and comparative examples without the addition of surface-modified phase-change nanometal are used as a control group, and butane adsorption-desorption tests are performed to determine the butane working capacity (denoted as BWC0). The initial temperature and test results are shown in Table 1.

[0100] The test process mainly refers to the national standard GB / T20449-2006, the Japanese standard TEST-1201 and the American standard ASTM-D5228, the adsorption and desorption time is limited according to the actual working condition and the constant temperature of 25 DEG C is not kept (the adsorption-desorption process does not carry out temperature control); the specific test steps are as follows: 30 mL activated carbon particles are loaded in a sample tube with a plug, the weight is weighed before and after loading, then the outlet is connected with a flowmeter, 10 min of pure butane gas is introduced, the flow is 250 mL / min. After stopping the introduction of butane, the sample tube is weighed together with the plug and activated carbon particles, then the flowmeter is connected to introduce dry air for 10 min, the flow is 300 mL / min, after the end, the mass of the sample tube with the plug and activated carbon is weighed again;

[0101] The butane working capacity is calculated according to formula (1):

[0102]

[0103] In formula (1), m1 is the total mass of the dry sample tube and plug;

[0104] m2 is the total mass of the activated carbon particles, dry sample tube and plug;

[0105] m3 is the total mass of the activated carbon particles, sample tube and plug after adsorbing butane;

[0106] m4 is the total mass of the activated carbon particles, dry sample tube and plug after air desorption. The butane adsorption-desorption capacity improvement rate is calculated according to formula (2):

[0107]

[0108] Table 1

[0109]

[0110]

[0111] From table 1, it can be known that:

[0112] (1) the activated carbon particles doped with surface modified phase change nano metal prepared by the preparation method provided in embodiments 1-6 have excellent regulation and control of the system thermal effect in the adsorption-desorption process, so as to improve the overall adsorption-desorption performance of the material, the butane adsorption-desorption capacity improvement rate is >10%;

[0113] (2)Comparing Example 1 with Examples 7-8, it can be seen that when the ultrasonic temperature is too low, the metal is in solid phase because the temperature is lower than the melting point, so that the nano metal cannot form particles; when the ultrasonic temperature is too high, the metal surface reacts with water to form hydroxide, which consumes part of the nano metal and reduces the loading; comparing Example 1 with Example 9, it can be seen that when the ultrasonic time is too short, the low-melting-point metal is not dispersed enough, so that the surface-modified phase-change nano metal has a large particle size and cannot be uniformly dispersed in the active carbon material structure;

[0114] (3)Comparing Example 1 with Examples 10-11, it can be seen that when the amount of ligand is too small, the interface functional group is insufficient, so that the surface-modified phase-change nano metal aggregates into large particles that cannot enter the carbon structure and cannot control the thermal effect of the system during the adsorption-desorption process; when the amount of ligand is too large, the sulfur content is too high, so that the nano metal particles are completely converted into sulfides, and the surface-modified phase-change nano metal loses the phase-change ability; comparing Example 1 with Comparative Example 1, it can be seen that when the ligand used does not contain a mercapto functional group, the metal nano particles cannot form a stable interface on the surface, so that the metal nano particles aggregate when mixed with the binder, forming large particles that cannot be dispersed into the carbon structure; comparing Example 1 with Example 12, it can be seen that when the stirring temperature in step (2) is too high, the nano metal particles are more active and are also prone to aggregation to form larger particles, thereby affecting their working performance;

[0115] (4)Comparing Example 1 with Examples 13-14, it can be seen that when the amount of binder is too small, the viscosity is not enough, so that the active carbon cannot be formed and its butane working capacity cannot be tested; when the amount of binder is too large, the number of surface-modified phase-change nano metal particles is insufficient, and the overall thermal effect is too low, so that the active carbon particles cannot obtain complete performance improvement;

[0116] (5)Comparing Example 1 with Comparative Example 2, it can be seen that when the surface-modified phase-change nano metal is prepared by one-step ultrasonic mixing, the sulfur ligand reacts with the metal particles and aggregates, so that the metal particles produced after ultrasonic mixing aggregate when mixed with the binder and carbon powder in the subsequent step, and cannot be anchored into the carbon structure.

[0117] The applicant declares that the above examples illustrate the detailed structural features of the present application, but the present application is not limited to the above detailed structural features, i.e. it does not mean that the present application must rely on the above detailed structural features to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of the components selected by the present application, addition of auxiliary components, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

[0118] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details of the above-described embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0119] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0120] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

Claims

1. A method for producing activated carbon particles, characterized by, The preparation method comprises the following steps: (1) dispersing a low-melting-point metal in a solvent, performing ultrasonic treatment to obtain nano metal particles; (2) mixing a ligand and the nano metal particles of step (1), stirring to obtain surface-modified phase-change nano metal; (3) dispersing activated carbon powder, a binder and the surface-modified phase-change nano metal of step (2) in water, sequentially performing molding and drying to obtain the activated carbon particles; The low-melting-point metal of step (1) comprises any one or a combination of at least two of gallium, gallium-indium alloy, gallium-indium-tin alloy, bismuth-indium-tin-lead alloy or indium-tin-bismuth alloy; The ligand of step (2) comprises any one or a combination of at least two of γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane or bis-[γ-(triethoxysil)propyl]tetrasulfide; The mass ratio of the ligand to the low-melting-point metal of step (2) is 1:(8-12).

2. The production method according to claim 1, characterized by, The solvent of step (1) comprises any one or a combination of at least two of water, glycerol, PEG200 or PEG400.

3. The preparation method according to claim 1, characterized in that, The solid-liquid ratio of the low-melting-point metal to the solvent of step (1) is 1:(8-12) g / mL.

4. The production method according to claim 1, characterized by, The frequency of the ultrasonic treatment of step (1) is 25-35 Hz.

5. The method of claim 1, wherein, The power of the ultrasonic treatment of step (1) is 110-130 W.

6. The method of claim 1, wherein, The temperature of the ultrasonic treatment of step (1) is 30-70℃.

7. The preparation method according to claim 1, characterized in that, The time of the ultrasonic treatment of step (1) is 0.5-2 h.

8. The method of claim 1, wherein, The time of the ultrasonic treatment of step (1) is 1-2 h.

9. The method of claim 1, wherein, The particle size of the nano metal particles of step (1) is 100-300 nm.

10. The method of claim 1, wherein, The mixing of step (2) further comprises adding a magnetic material.

11. The method of claim 10, wherein, The mass ratio of the ligand to the magnetic material is 1:(0.1-0.5).

12. The method of claim 10, wherein, The magnetic material comprises nano Fe3O4 and / or nano γ-Fe2O3 powder.

13. The method of claim 1, wherein, The temperature of the stirring of step (2) is 10-30℃.

14. The method of claim 1, wherein, The time of the stirring of step (2) is 8-15 min.

15. The method of claim 1, wherein, The mass ratio of the surface-modified phase-change nano metal to the binder of step (3) is 1:(1.5-4).

16. The method of claim 1, wherein, The binder of step (3) comprises any one or a combination of at least two of water glass, clay, wood tar or phenolic resin.

17. An activated carbon particle, characterized by, The activated carbon particles are prepared by the preparation method of any one of claims 1-16.

18. The use of activated carbon particles according to claim 17, characterized in that The activated carbon particles are used for fuel vapor adsorption.

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