CN111068672B - Method for loading nano platinum on activated carbon fiber - Google Patents
Method for loading nano platinum on activated carbon fiber Download PDFInfo
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- CN111068672B CN111068672B CN201911303319.0A CN201911303319A CN111068672B CN 111068672 B CN111068672 B CN 111068672B CN 201911303319 A CN201911303319 A CN 201911303319A CN 111068672 B CN111068672 B CN 111068672B
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 139
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 70
- 238000011068 loading method Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 47
- 239000004917 carbon fiber Substances 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000011148 porous material Substances 0.000 claims abstract description 30
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 7
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 21
- 229910052715 tantalum Inorganic materials 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 12
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 12
- 239000012279 sodium borohydride Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000007598 dipping method Methods 0.000 claims description 10
- 238000009210 therapy by ultrasound Methods 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 8
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- 239000007788 liquid Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
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- 229910044991 metal oxide Inorganic materials 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
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- 239000003054 catalyst Substances 0.000 description 2
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
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- 230000032683 aging Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- -1 platinum activated carbon fiber Chemical class 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
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- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/52—Gold
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/633—Pore volume less than 0.5 ml/g
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
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Abstract
The invention relates to a method for loading nano platinum on activated carbon fiber, which comprises the following steps: mixing and heating activated carbon fibers and magnesium powder for reaction, and washing after the reaction is finished to obtain the expanded activated carbon fibers; then loading nano platinum on the expanded active carbon fiber to obtain the active carbon fiber loaded with the nano platinum. According to the invention, firstly, the active carbon fiber is subjected to reaming treatment, so that the number of macropores is obviously increased, the pore volume is increased, and the loading capacity of the active carbon fiber to the nano platinum is increased. In addition, the pore-enlarging treatment method can realize fine control of the inner and outer pore structures of the activated carbon fiber, the pore channel surface of the activated carbon fiber after pore-enlarging treatment is slightly changed, the binding force between the activated carbon fiber and the nano platinum is increased, the nano platinum is more firmly loaded, the stability of the nano platinum is increased, the service life of the nano platinum is prolonged, and the pore-enlarging treatment method has a good application prospect.
Description
Technical Field
The invention relates to the field of catalyst preparation, in particular to a method for loading nano platinum on activated carbon fibers.
Background
The activated carbon fiber has the characteristics of large specific surface area and many pores, the nano platinum has excellent photocatalysis and other functional effects, and the combination of the nano platinum and the nano platinum has a strong adsorption and removal function on harmful gas, liquid, harmful ions, solid particles and the like, and has wide application in various fields of energy, environmental protection and the like.
The activated carbon fiber has excellent adsorption performance, and can load different metal and inorganic functional materials when the functional activated carbon fiber is prepared. For example, CN105817234B discloses a method for extracting nano-multi-metal oxide loaded activated carbon fiber, dissolving washed and screened vanadium-titanium steel slag with sulfuric acid, separating the residue, and then dissolving Fe (NO) in the residue 3 )·9H 2 O and Mn (NO) 3 ) 2 Mixing, adding ammonia water under vigorous stirring, precipitating to obtain nanoscale multi-metal oxide sol, adding activated carbon, stirring, ultrasonic treating, standing, aging, oven drying, grinding, oven drying at 120 deg.C, and calcining in nitrogen gas for a certain time to obtain the final product. CN108190885A discloses a method for preparing uniformly metal-doped activated carbon, which comprises the steps of firstly crushing cellulose by a crusher, drying the cellulose in an oven, then mixing sodium hydroxide, urea and water to prepare an alkali urea solution, adding a metal compound to be doped, dissolving, then precooling to a temperature below-10 ℃, putting cellulose powder into the solution, stirring, freezing the obtained cellulose mixed solution, then placing the obtained cellulose mixed solution into a muffle furnace, heating the mixed solution to 105-125 ℃ for drying for 120-300min, and then heating the mixed solution to 600-700 ℃ for activation for 30-90min to obtain the uniformly metal-doped activated carbon.
When the method loads metal or metal oxide on the activated carbon, the preparation process is complicated, the cost is high, and the method is not suitable for loading a large amount of activated carbon fibers. Meanwhile, the common activated carbon fiber has insufficient nano platinum loading capacity due to small pores and limited quantity, and has poor loading fastness and influenced effect.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a method for loading nano platinum on activated carbon fibers.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for loading nano platinum on activated carbon fiber, which comprises the following steps:
(1) Mixing activated carbon fiber and magnesium powder, heating the obtained mixture for reaction, and washing after the reaction is finished to obtain the expanded activated carbon fiber;
(2) And (2) loading nano platinum on the expanded-pore activated carbon fiber obtained in the step (1) to obtain the nano platinum-loaded activated carbon fiber.
The method comprises the steps of firstly mixing activated carbon fiber and magnesium powder, then reacting at high temperature, wherein magnesium and carbon form a compound in the reaction process, and removing the compound through washing after the reaction is finished to obtain the pore-enlarged activated carbon fiber. After the hole expanding treatment in the step (1), the number of macropores of the activated carbon fiber is obviously increased, and the pore volume is increased. And nano platinum is further loaded on the expanded activated carbon fiber, so that the nano platinum has more loading capacity.
In addition, the pore-expanding treatment can realize fine control of the inner and outer pore structures of the activated carbon fiber, the surface of the pore channel of the activated carbon fiber after the pore-expanding treatment is slightly changed, the binding force between the activated carbon fiber and the nano platinum is increased, compared with the prior treatment, the nano platinum is more firmly loaded, the stability of the nano platinum is increased, and the service life of the nano platinum is prolonged.
According to the invention, before the mixing in the step (1), the method further comprises a step of pretreating the activated carbon fiber, wherein the pretreatment comprises the following steps: and drying the activated carbon fiber. The active carbon fiber has strong hygroscopicity, and the pretreatment and drying are to remove water in the active carbon fiber and avoid the influence of the reaction of magnesium metal and water on the structure and performance of the active carbon fiber at high temperature.
The specific drying conditions are not particularly limited, as long as the purpose of drying the activated carbon fiber can be achieved.
According to the invention, the reaction of step (1) is carried out in a metal tantalum can. The invention selects the metal tantalum tank to carry out the reaction, because the material of the common reaction vessel is easy to react with the reactant (magnesium powder and/or activated carbon fiber) to generate impurities, and further the preparation result is adversely affected. Within the temperature range limited by the invention, the tantalum metal and the two reactants do not react, so the tantalum tank is selected as the reaction container, the condition can be effectively avoided, and the high-quality expanded active carbon fiber is finally prepared.
It is noted that, in addition to tantalum cans, other vessels that do not react with the magnesium powder and/or activated carbon fibers within the temperature ranges specified in the present invention and that are strong enough to support the reaction are suitable for use in the present invention. Such as tungsten cans, etc., but a large number of experiments have verified that tantalum cans react most effectively and therefore should be the most preferred for the present invention.
Further, for the present invention, the reaction vessel may be a pure tantalum tank, but the cost is relatively high. Besides, the reaction vessel with the outer layer of other metals or non-metals and the inner layer (inner container) of tantalum skin can be selected. In general, the thickness of the tantalum scale in the metal tantalum can is set to 0.05-0.1 mm.
For the purpose of avoiding the formation of impurities during the reaction, the reaction of step (1) of the present invention is carried out in a protective gas comprising nitrogen and/or an inert gas. The inert gas may be argon, helium, etc., and the present invention is not particularly limited thereto.
According to the invention, the mass ratio of the magnesium powder to the activated carbon fiber in the mixture in the step (1) is 1 (9-99), and can be, for example, 1.
The mixing proportion of the activated carbon fiber and the magnesium powder directly influences the proportion of macropores, mesopores and micropores and the pore volume of the finally obtained expanded activated carbon fiber, and the proportion is specifically limited according to actual requirements. The proportion of the magnesium powder and the aluminum powder must be kept within the range, and the reaction is insufficient due to too low proportion (too little magnesium powder) so that the hole expanding effect is not obvious; when the proportion is too high (magnesium powder is too much), magnesium reacts with the activated carbon fiber too violently, so that the pore structure in the fiber is destroyed, and the subsequent load of the nano platinum is influenced.
According to the invention, the temperature of the reaction in step (1) is 700-1200 ℃, for example 700 ℃, 800 ℃, 900 ℃, 1000 ℃, 1100 ℃ or 1200 ℃ and the like; the reaction time is 10min to 120min, for example, 10min, 30min, 60min, 90min or 120 min.
The reaction temperature and the reaction time are the key for finally obtaining the high-quality expanded active carbon fiber, the reaction temperature is too low, the vapor pressure formed by metal magnesium is low, and the metal magnesium is difficult to fully permeate into fiber pores, so that the reaction is insufficient; when the reaction temperature is too high, the concentration of metal magnesium is too high, the pressure is too high, and the pores are damaged during the reaction; correspondingly, the reaction time is too short, so that the magnesium and the carbon can not react fully, the hole expanding effect is not ideal, most of pore structures are damaged due to too long reaction time, most of pores are formed, and the adsorption and load capacity of the activated carbon fibers is reduced on the contrary.
According to the present invention, the washing of step (1) comprises: and ultrasonically cleaning a product obtained after the reaction is finished in deionized water, and then drying the obtained product. New impurities cannot be brought in by using deionized water as a washing solvent, and the impurities in the reactants can be effectively removed by using ultrasonic cleaning without damaging the internal structure of the expanded active carbon fiber.
Specifically, the power and time of the ultrasound in the ultrasound cleaning process can be specifically adjusted according to actual conditions, and the invention is not particularly limited.
According to the invention, the method for loading nano platinum in the step (2) comprises the following steps: and (2) dipping the hole-expanded activated carbon fiber obtained in the step (1) in a chloroplatinic acid solution for ultrasonic treatment, removing the liquid, dipping in a sodium borohydride solution, and heating to obtain the nano platinum-loaded activated carbon fiber.
The above method is only a specific example for describing the present invention in detail, and it is obvious to those skilled in the art that any method capable of loading nano platinum on the activated carbon fiber is applicable to the present invention, but not limited thereto.
According to the present invention, the mass percentage of the chloroplatinic acid solution is 0.1wt.% to 5wt.%, and may be, for example, 0.1wt.%, 0.5wt.%, 1wt.%, 2wt.%, 3wt.%, 4wt.%, or 5wt.%, and the like, which may be specifically adjusted according to the loading amount actually required.
According to the invention, the time of the ultrasonic treatment is 30min-120min, for example, 30min, 50min, 80min, 100min or 120min and the like. The power of the ultrasonic treatment can be specifically selected according to actual conditions, as long as the purpose of uniformly and stably loading platinum on the activated carbon fiber can be realized, and the invention is not specially limited.
According to the present invention, the mass percentage of the sodium borohydride solution is 1wt.% to 10wt.%, for example, 1wt.%, 3wt.%, 5wt.%, 8wt.%, or 10wt.%, which can be specifically adjusted according to actual conditions.
According to the invention, the heating in step (2) comprises: heating to boil and keeping for 1-10min.
As a preferred technical scheme, the method for loading the nano platinum on the activated carbon fiber comprises the following steps:
(1) Drying the activated carbon fiber, mixing the dried activated carbon fiber with magnesium powder, placing the mixture into a metal tantalum tank, heating the obtained mixture to react, placing a product obtained after the reaction in deionized water for ultrasonic cleaning, and drying the product after the cleaning is finished to obtain the expanded active carbon fiber;
(2) And (2) dipping the hole-expanded activated carbon fiber obtained in the step (1) in a chloroplatinic acid solution for ultrasonic treatment, removing the liquid, dipping in a sodium borohydride solution, and heating to obtain the nano platinum-loaded activated carbon fiber.
By adopting the preferable technical scheme, the nano platinum activated carbon fiber with more loading capacity and firmer combination can be obtained.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) According to the invention, firstly, the active carbon fiber is subjected to hole expansion treatment, so that the number of macropores is obviously increased, the proportion of the macropores reaches about 30%, the pore volume is increased to about 0.5mL/g, and the loading capacity of the active carbon fiber to the nano platinum is increased.
(2) The pore-enlarging treatment method provided by the invention can realize fine control of the inner and outer pore structures of the activated carbon fiber, the pore channel surface of the activated carbon fiber after pore-enlarging treatment is slightly changed, the binding force between the activated carbon fiber and the nano platinum is increased, the nano platinum is more firmly loaded, the stability of the nano platinum is increased, and the service life of the activated carbon fiber is prolonged.
Drawings
Fig. 1 is a microscopic morphology view of the nano platinum-loaded activated carbon fiber prepared in example 1 of the present invention.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a method for loading nano platinum on activated carbon fiber, which comprises the following steps:
(1) Selecting 2g of viscose-based activated carbon fiber, drying the viscose-based activated carbon fiber for 2 hours at 150 ℃, placing the dried activated carbon fiber in a crucible with a metal tantalum shell as an inner container, wherein the thickness of the tantalum shell is 0.05mm, then adding 0.03g of magnesium powder, wherein the weight ratio of the magnesium powder to the activated carbon fiber is 3; ultrasonically cleaning a product obtained after the reaction in deionized water for 1 hour, and then drying the product for 2 hours at the temperature of 120 ℃ to obtain the expanded active carbon fiber;
(2) Dipping the hole-expanding activated carbon fiber obtained in the step (1) in a chloroplatinic acid aqueous solution, wherein the mass percent of the chloroplatinic acid is 0.5 wt%, and carrying out ultrasonic treatment for 30 minutes; and removing the liquid of the impregnated expanded active carbon fiber, then impregnating the expanded active carbon fiber in an aqueous solution of sodium borohydride, wherein the mass percent of sodium borohydride is 2.5wt.%, heating the expanded active carbon fiber to boiling, and keeping the boiling temperature for 3 minutes to obtain the expanded active carbon fiber loaded with nano platinum.
SEM scanning the nano platinum loaded expanded activated carbon fiber prepared in this example, and the obtained photograph is shown in fig. 1; as can be seen from the figure, compared with the activated carbon fiber before pore expansion, the pore volume of the expanded activated carbon fiber is obviously increased, the ratio of micropores is reduced, the ratio of mesopores to macropores is obviously increased, and the loading capacity of the nano platinum is obviously increased.
The pore volume and pore diameter of the viscose-based activated carbon fiber selected in this example and the expanded active carbon fiber prepared in step (1) were measured by a specific surface area measurement (BET) method, and the obtained results are shown in table 1.
TABLE 1
The radius of the macropores is larger than 50nm, the radius of the mesopores is 2-50nm, and the radius of the micropores is smaller than 2nm.
As can be seen from the data in Table 1, after reaming, the pore volume of the viscose activated carbon fiber is enlarged by 0.92mL/g, the proportion of macropores is increased by 25.3%, and the proportion of mesopores is increased by 3.3%, which indicates that the method provided by the invention can effectively increase the pore volume and the proportion of macropores of the activated carbon fiber.
Example 2
The embodiment provides a method for loading nano platinum on activated carbon fiber, which comprises the following steps:
(1) 2g of polyacrylonitrile-based active carbon fiber is selected and dried for 2 hours at 150 ℃, the dried active carbon fiber is placed in a crucible with a metal tantalum shell as an inner container, the thickness of the tantalum shell is 0.08mm, then 0.05g of magnesium powder is added, the weight ratio of the magnesium powder to the active carbon fiber is 1; after the reaction is finished, ultrasonically cleaning the obtained product in deionized water for 1.5 hours, and then drying the product at 120 ℃ for 2 hours to obtain the expanded active carbon fiber;
(2) Soaking the hole-expanding activated carbon fiber obtained in the step (1) in a chloroplatinic acid aqueous solution, wherein the mass percent of the chloroplatinic acid is 1.5 wt%, and performing ultrasonic treatment for 60 minutes; and removing the liquid of the impregnated expanded active carbon fiber, then impregnating the expanded active carbon fiber in an aqueous solution of sodium borohydride, wherein the mass percent of sodium borohydride is 4 wt%, and heating the expanded active carbon fiber to boiling and keeping the boiling state for 5 minutes to obtain the expanded active carbon fiber loaded with nano platinum.
Example 3
The embodiment provides a method for loading nano platinum on activated carbon fiber, which comprises the following steps:
(1) 2g of asphalt-based activated carbon fiber is selected to be dried for 2 hours at 150 ℃, the dried activated carbon fiber is placed in a crucible of which the inner container is a metal tantalum skin, the thickness of the tantalum skin is 0.1mm, then 0.1g of magnesium powder is added, the weight ratio of the magnesium powder to the activated carbon fiber is 1; ultrasonically cleaning a product obtained by the reaction in deionized water for 2.5 hours, and then drying the product for 2 hours at 120 ℃ to obtain the expanded active carbon fiber;
(2) Dipping the hole-expanding activated carbon fiber obtained in the step (1) in a chloroplatinic acid aqueous solution, wherein the mass percent of the chloroplatinic acid is 5 wt%, and performing ultrasonic treatment for 150 minutes; and removing the liquid of the impregnated expanded active carbon fiber, then impregnating the expanded active carbon fiber in an aqueous solution of sodium borohydride, wherein the mass percent of sodium borohydride is 5wt.%, heating the expanded active carbon fiber to boiling, and keeping the boiling state for 8 minutes to obtain the expanded active carbon fiber loaded with nano platinum.
Comparative example 1
And (3) directly loading the nano platinum on the viscose activated carbon fiber, wherein the loading method and conditions are the same as those in the step (2) in the embodiment 1, so that the viscose-based activated carbon fiber loaded with the nano platinum is obtained.
Comparative example 2
The nano platinum is directly loaded on the polyacrylonitrile-based active carbon fiber, and the loading method and conditions are the same as those in the step (2) in the embodiment 2, so that the polyacrylonitrile-based active carbon fiber loaded with the nano platinum is obtained.
Comparative example 3
And (3) directly loading the nano platinum on the asphalt-based activated carbon fiber, wherein the loading method and conditions are the same as those in the step (2) in the example 3, so that the asphalt-based activated carbon fiber loaded with the nano platinum is obtained.
And (3) performance testing:
the amount of nano platinum loaded in the nano platinum loaded activated carbon fibers obtained in each example and comparative example was measured, and then used as catalysts in experiments for removing formaldehyde and benzene, respectively, according to the following method.
According to "method for measuring purification Effect of indoor air purification product" (QB/T2761)-2006), test chamber volume 1.5m 3 (two: one is a sample chamber and the other is a blank chamber), and the sample is suspended in the sample chamber (3 m) 2 ) The formaldehyde and the benzene are released uninterruptedly and naturally and slowly, the action time is 24 hours, and the removal effect is calculated according to the test standard.
The results obtained are shown in table 2:
TABLE 2
As can be seen from the data in table 2, compared with the method before pore expansion, the removal rate of formaldehyde and benzene is obviously improved after the activated carbon fiber subjected to pore expansion processing is loaded with nano platinum, and the service life is also greatly improved. The change of the pore structure makes the nano platinum more easily loaded into the pores of the activated carbon fiber on one hand, and on the other hand, the surface of the pore channel of the activated carbon fiber is slightly changed, so that the bonding force between the nano platinum and the nano platinum is enhanced, the nano platinum loading fastness is higher, and the use durability is obviously improved.
The applicant states that the present invention is described by the above embodiments to explain the detailed structural features of the present invention, but the present invention is not limited to the above detailed structural features, that is, it is not meant to imply that the present invention must be implemented by relying on the above detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention can be made, and the same should be considered as the disclosure of the present invention as long as the idea of the present invention is not violated.
Claims (5)
1. A method for loading nano platinum on activated carbon fibers is characterized by comprising the following steps:
(1) Mixing activated carbon fiber and magnesium powder, heating the obtained mixture for reaction, and washing after the reaction is finished to obtain the expanded active carbon fiber; before mixing, pretreating the activated carbon fiber, wherein the pretreatment comprises the following steps: drying the activated carbon fiber; the reaction is carried out in a protective gas comprising nitrogen and/or an inert gas; the mass ratio of the magnesium powder to the activated carbon fiber in the mixture is 1 (9-99); the reaction temperature is 700-1200 ℃; the reaction time is 10min-120min; the reaction is carried out in a metal tantalum tank, and the thickness of a tantalum skin in the metal tantalum tank is 0.05-0.1mm;
(2) And (2) loading nano platinum on the expanded-pore activated carbon fiber obtained in the step (1) to obtain the nano platinum-loaded activated carbon fiber.
2. The method for loading nano platinum on the activated carbon fiber according to claim 1, wherein the washing in the step (1) comprises: and ultrasonically cleaning a product obtained after the reaction is finished in deionized water, and then drying the obtained product.
3. The method for loading nano platinum on the activated carbon fiber according to claim 1, wherein the method for loading nano platinum in the step (2) comprises: and (2) dipping the hole-expanded activated carbon fiber obtained in the step (1) in a chloroplatinic acid solution for ultrasonic treatment, removing the liquid, dipping in a sodium borohydride solution, and heating to obtain the nano platinum-loaded activated carbon fiber.
4. The method for loading nano platinum on the activated carbon fiber according to claim 3, wherein the mass percent of the chloroplatinic acid solution is 0.1-5 wt.%, and the ultrasonic treatment time is 30-120 min;
the mass percent of the sodium borohydride solution is 1wt.% to 10wt.%;
the heating includes: heating to boil and keeping for 1-10min to obtain the nanometer platinum loaded activated carbon fiber.
5. The method for loading nano platinum on the activated carbon fiber according to any one of claims 1 to 4, wherein the method comprises the following steps:
(1) Drying activated carbon fibers, mixing the dried activated carbon fibers with magnesium powder, placing the mixture in a metal tantalum tank, heating the obtained mixture to react, placing a product obtained after the reaction in deionized water for ultrasonic cleaning, and drying the cleaned product to obtain the expanded activated carbon fibers;
(2) And (2) dipping the hole-expanded activated carbon fiber obtained in the step (1) in a chloroplatinic acid solution for ultrasonic treatment, removing the liquid, dipping in a sodium borohydride solution, and heating to obtain the nano platinum-loaded activated carbon fiber.
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