CN108079951A - The preparation method of the carbon nanotubes of metal ion/LDHs composite materials in a kind of absorption ultra-pure ammonia - Google Patents
The preparation method of the carbon nanotubes of metal ion/LDHs composite materials in a kind of absorption ultra-pure ammonia Download PDFInfo
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Abstract
The present invention relates to a kind of preparation methods for adsorbing carbon nanotubes/LDHs composite materials of metal ion in ultra-pure ammonia, by the way that carbon nanotubes and anion surfactant or anionic polyelectrolyte are carried out reaction modification under hydrothermal condition, so that carbon nano tube surface carries negative electrical charge, so as to be combined with each other to form composite material with LDHs using the principle of the replaceable insertion of LDHs interlayer anions, the beneficial effects of the invention are as follows：By negatively charged carbon nanotubes intercalation after anion modified into LDHs interlayers, both the suction-operated of carbon nano tube surface functional group had been make use of, solve the problems, such as that carbon nanotubes cannot be separately as metal ion adsorbent in ultra-pure ammonia again, carbon nanotubes and the electrostatic interaction of LDHs laminates greatly strengthen suction-operated of the carbon nanotubes to metal ion in itself again simultaneously, play the role of being used alone considerably beyond carbon nanotubes and LDHs.
Description
Technical field
The application is for Application No. 201610195223.7, and the applying date is on March 31st, 2016, entitled " a kind of
The division Shen of the application for a patent for invention of the preparation method of carbon nanotubes/LDHs composite materials of metal ion in absorption ultra-pure ammonia "
Please.
The present invention relates to a kind of preparation method of composite material more particularly to a kind of carbon nanotubes and LDHs composite materials
Preparation method belongs to technical field of composite materials.
Background technology
In recent years, the LED technology in China and related industry are grown rapidly, with the hair of the photoelectronic industries such as LED
Exhibition, market proposes requirements at the higher level to the purity of electronic gas, so greatly having promoted upstream key supplementary material ultra-pure ammonia
Purification research.
7N electronic grade ultrapure ammonias are the weights that a kind of very important photoelectron material and MOCVD technologies prepare GaN
Basic material is wanted, the gallium nitride used in LED productions is semi-conducting material, so in process of production, it is necessary to in raw material
Metal ion is strictly controlled, and still, mainly utilizes ammonia to the purifying process of metal ion in ultra-pure ammonia both at home and abroad at present
The physicochemical property of gas is purified step by step using multistep, including vaporizing, condensing, adsorbing, rectifying, terminal purifying, the technologies purification such as freezing
Ammonia, the purifying process of these ammonia is usually to moisture and H2、O2、N2、CH4, the light components impurity such as CO have preferable effect, it is and right
The effect of metal ion removal is undesirable.
Carbon nanotubes has unique structure and unusual property, from carbon nanotubes by since finding for the first time, performance and
Using all widely being studied, carbon nanotubes is hollow and two end seals crimped by the hexagonal mesh of similar graphite
The multilayer tubular object closed, carbon nanotube diameter is between several nanometers to several tens of nanometers, and length is up to a few micrometers, synusia spacing one
As for 0.34nm, due to its electronic structure with great specific surface area and chemical stability and uniqueness, vestibule structure and
Absorption property, excellent electronic conductivity, special vestibule space multistory selectivity cause it to be produced for reaction species and reaction
Object has special absorption property, and carbon nanotubes can pass through electrostatic attraction, adsorption precipitation and metal ion and carbon nanotubes
The chemical action of surface functional group carry out adsorbing metal ions, but carbon nanotubes cannot be placed directly in ultra-pure ammonia, so
Although metal ion can be removed, carbon nanotubes cannot can cause ultra-pure ammonia new with ultrapure ammonia separation after removal
Pollution, works so carbon nanotubes will be attached on other materials.
Layered double hydroxide (LDHs) is a kind of anion lamellar compound, also known as hydrotalcite, and LDHs is by layer
Between anion and the accumulation of positively charged laminate form, there is the structure that can be embedded in anion, the structure such as sandwich of LDHs
Shape, both sides are made of the metal ion positive charge piece of divalent and trivalent, and centre is anion and hydrone, the main layer board of LDHs
With the particularity of the Nomenclature Composition and Structure of Complexes of interlayer object, the numerous special performances of LDHs are imparted, the anion of LDHs interlayers can be with
Anion with various specific functions swaps, so as to synthesize the intercalation configuration material with different performance.
The content of the invention
The present invention is provided for deficiency existing for adsorption of metal ions technology in existing ultra-pure ammonia in a kind of absorption ultra-pure ammonia
The preparation method of the carbon nanotubes of metal ion/LDHs composite materials.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
The preparation method of the carbon nanotubes of metal ion/LDHs composite materials in a kind of absorption ultra-pure ammonia, which is characterized in that
Include the following steps：
1) preparation of LDHs：It soluble magnesium salts and aluminium salt is placed in dissolving in deionized water is configured to total concentration and be
The solution A of 0.5mol/L, Mg:Al=1:2, aqueous slkali B is added dropwise in solution A under constant agitation, in this process
It is middle holding solution ph 9~10, aqueous slkali B continue after being added dropwise stirring ageing 3~5 it is small when, filtering, wash repeatedly into
Property, products obtained therefrom is placed in when 6~10 is small in 80~100 DEG C of baking oven, colloidal sol is made；
2) acidifying of carbon nanotubes：The aqueous solution of oxidizing acid is added in into carbon nanotubes, 110~130 DEG C of conditions are next time
When stream 2~5 is small, centrifuges, washed with clear water to neutrality, the carbon nanotubes being acidified；
3) negatively charged carbon nanotubes is prepared：The carbon nanotubes of the acidifying of gained in step 2) is added to anion to gather
In the aqueous solution of electrolyte or anion surfactant, when ultrasonication 1~3 is small, stirred after in 50~70 DEG C of water-baths
When reaction 4~10 is small under the conditions of mixing, the concentration of aqueous solution of the anionic polyelectrolyte or anion surfactant for 1~
10g/L, the carbon nanotubes are 1 with the weight ratio of anionic polyelectrolyte or anion surfactant：(0.01~0.1),
It is centrifuged after having reacted and removes unreacted anionic polyelectrolyte or anion surfactant, obtain surface with negative electricity
The carbon nanotubes of lotus；
4) carbon nanotubes/LDHs compounds are prepared：The carbon nanotubes of gained in step 3) is added to obtained by step 1)
In colloidal sol, the weight ratio of carbon nanotubes and colloidal sol is 1：(20~30), after the mixture of the two is placed in 50~70 DEG C of water-baths
Ion-exchange reactions is carried out under stirring condition, when the reaction time 6~8 is small, filtering and washing, dry after completion of the reaction, obtains carbon and receives
Mitron/LDHs compounds.
Further, aluminium salt described in step 1) and magnesium salts are aluminum nitrate and magnesium nitrate, and the aqueous slkali is molten for sodium hydroxide
Liquid.
Further, oxidizing acid described in step 2) refers to one or more of nitric acid, sulfuric acid, permanganic acid, hypochlorous acid
Mixture.
Further, the anionic polyelectrolyte described in step 3) is kayexalate, in sodium lignin sulfonate
One or more, the anion surfactant are neopelex.
Further, the carbon nanotubes is one kind in single-walled carbon nanotube, multi-walled carbon nanotube.
The beneficial effects of the invention are as follows：
1) negatively charged carbon nanotubes intercalation after anion modified carbon nanotubes table had both been make use of into LDHs interlayers
The suction-operated of face functional group, but solve the problems, such as carbon nanotubes cannot separately as metal ion adsorbent in ultra-pure ammonia,
Carbon nanotubes and the electrostatic interaction of LDHs laminates greatly strengthen suction-operated of the carbon nanotubes to metal ion in itself again simultaneously,
Play the role of being used alone considerably beyond carbon nanotubes and LDHs；
2) whole preparation process reaction condition is mild, easy to operate, it is easy to accomplish.
The compound of gained of the invention can be filled in the drier in ultra-pure ammonia prepurification stage, instead of original common water removal
The molecular sieve of deoxygenation can be also placed in as adsorbent in the transfer pipeline of ultra-pure ammonia.
Specific embodiment
The principle of the present invention and feature are described below in conjunction with example, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
Embodiment 1：
The preparation method of the carbon nanotubes of metal ion/LDHs composite materials in a kind of absorption ultra-pure ammonia, including walking as follows
Suddenly：
1) 150gAl (NO are weighed3)3·9H2O and 51.3gMg (NO3)2·6H2O is dissolved in 1200mL deionized waters, is prepared
It is 0.5molL into total concentration-1Mixing salt solution, weigh 80gNaOH and be dissolved in 400ml deionized waters and be configured to 5molL-1NaOH solution, NaOH solution is added dropwise in mixing salt solution under agitation, be added dropwise during keep system
PH value 9~10, NaOH solution continue after being added dropwise stirring ageing 3 it is small when, products therefrom is filtered, it is anti-using deionized water
After backwashing 3 times is placed in the hydrotalcite colloidal sol for being made that solid content is 2wt% when 6 is small in 100 DEG C of thermostatic drying chambers；
2) 20~40nm of diameter of 100g Shenzhen nanometer port Co., Ltd purchase, the multi-wall carbon nano-tube that 1~2 μm of length are weighed
Pipe adds in the nitric acid 500ml of 3mol/L thereto, be heated at 120 DEG C reflux 3 it is small when, be cooled to room temperature, centrifuge, clearly
Water washing is to neutrality, the carbon nanotubes being acidified；
3) the carbon nanotubes 50g for weighing the acidifying of gained in step 2) is added to the polystyrene that 500ml concentration is 6g/L
In sodium sulfonate (abbreviation PSS) aqueous solution, be initially positioned in 20Hz ultrasonic devices ultrasound 2 it is small when, be placed on 60 DEG C of stirred in water bath items
It when reaction 5 is small under part, is centrifuged after having reacted and removes unreacted PSS, obtain the carbon nanotubes that surface carries negative electrical charge；
4) the carbon nanotubes 20g of gained in step 3) is taken to be placed in 400g steps 1) in the colloidal sol of gained, by the mixed of the two
Close object and be placed under the conditions of 50 DEG C of stirred in water bath and carry out ion-exchange reactions, when reaction 6 is small after filtering and washing, it is dry, obtain carbon and receive
Mitron/LDHs compounds.
Embodiment 2：
The preparation method of the carbon nanotubes of metal ion/LDHs composite materials in a kind of absorption ultra-pure ammonia, including walking as follows
Suddenly：
1) 150gAl (NO are weighed3)3·9H2O and 51.3gMg (NO3)2·6H2O is dissolved in 1200mL deionized waters, is prepared
It is 0.5molL into total concentration-1Mixing salt solution, weigh 80gNaOH and be dissolved in 400ml deionized waters and be configured to 5molL-1NaOH solution, NaOH solution is added dropwise in mixing salt solution under agitation, be added dropwise during keep system
PH value 9~10, NaOH solution continue after being added dropwise stirring ageing 3 it is small when, products therefrom is filtered, it is anti-using deionized water
After backwashing 3 times is placed in the hydrotalcite colloidal sol for being made that solid content is 2wt% when 6 is small in 100 DEG C of thermostatic drying chambers；
2) 20~40nm of diameter of 100g Shenzhen nanometer port Co., Ltd purchase, the multi-wall carbon nano-tube that 1~2 μm of length are weighed
Pipe adds in the sulfuric acid 500ml of 5mol/L thereto, be heated at 130 DEG C reflux 2 it is small when, be cooled to room temperature, centrifuge, clearly
Water washing is to neutrality, the carbon nanotubes being acidified；
3) the carbon nanotubes 50g for weighing the acidifying of gained in step 2) is added to the dodecyl that 500ml concentration is 1g/L
In benzene sulfonate aqueous solution, be initially positioned in 20HZ ultrasonic devices ultrasound 1 it is small when, be placed under the conditions of 70 DEG C of stirred in water bath and react
4 it is small when, centrifuged after having reacted and remove unreacted neopelex, obtain the carbon nanometer that surface carries negative electrical charge
Pipe；
4) the carbon nanotubes 30g of gained in step 3) is taken to be placed in 750g steps 1) in the colloidal sol of gained, by the mixed of the two
Close object and be placed under the conditions of 60 DEG C of stirred in water bath and carry out ion-exchange reactions, when reaction 8 is small after filtering and washing, it is dry, obtain carbon and receive
Mitron/LDHs compounds.
Embodiment 3：
The preparation method of the carbon nanotubes of metal ion/LDHs composite materials in a kind of absorption ultra-pure ammonia, including walking as follows
Suddenly：
1) 150gAl (NO are weighed3)3·9H2O and 51.3gMg (NO3)2·6H2O is dissolved in 1200mL deionized waters, is prepared
It is 0.5molL into total concentration-1Mixing salt solution, weigh 80gNaOH and be dissolved in 400ml deionized waters and be configured to 5molL-1NaOH solution, NaOH solution is added dropwise in mixing salt solution under agitation, be added dropwise during keep system
PH value 9~10, NaOH solution continue after being added dropwise stirring ageing 3 it is small when, products therefrom is filtered, it is anti-using deionized water
After backwashing 3 times is placed in the hydrotalcite colloidal sol for being made that solid content is 5wt% when 6 is small in 100 DEG C of thermostatic drying chambers；
2) 20~40nm of diameter of 100g Shenzhen nanometer port Co., Ltd purchase, the single that 1~2 μm of length are weighed
Pipe adds in the permanganic acid 500ml of 3mol/L thereto, be heated at 110 DEG C reflux 5 it is small when, be cooled to room temperature, centrifuge,
Clear water is washed to neutrality, the carbon nanotubes being acidified；
3) the carbon nanotubes 50g for weighing the acidifying of gained in step 2) is added to the sulfomethylated lignin that 500ml concentration is 10g/L
In acid sodium aqueous solution, be initially positioned in 20HZ ultrasonic devices ultrasound 1 it is small when, reaction 10 is small under the conditions of being placed on 50 DEG C of stirred in water bath
When, it is centrifuged after having reacted and removes unreacted sodium lignin sulfonate, obtain the carbon nanotubes that surface carries negative electrical charge；
4) the carbon nanotubes 20g of gained in step 3) is taken to be placed in 600g steps 1) in the colloidal sol of gained, by the mixed of the two
Close object and be placed under the conditions of 70 DEG C of stirred in water bath and carry out ion-exchange reactions, when reaction 8 is small after filtering and washing, it is dry, obtain carbon and receive
Mitron/LDHs compounds.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (6)
- A kind of 1. preparation method for adsorbing carbon nanotubes/LDHs composite materials of metal ion in ultra-pure ammonia, which is characterized in that bag Include following steps：1) preparation of LDHs：Soluble magnesium salts and aluminium salt are placed in dissolving in deionized water and are configured to total concentration as 0.5mol/L Solution A, Mg:Al=1:2, aqueous slkali B is added dropwise in solution A under constant agitation, keeps molten in the process Liquid pH value 9~10, aqueous slkali B continue after being added dropwise stirring ageing 3~5 it is small when, filtering, washed repeatedly to neutrality, by gained Product is placed in when 6~10 is small in 80~100 DEG C of baking oven and colloidal sol is made；2) acidifying of carbon nanotubes：The aqueous solution of oxidizing acid is added in into carbon nanotubes, reflux 2 under the conditions of 110~120 DEG C~ 3 it is small when, centrifuge, washed with clear water to neutrality, the carbon nanotubes being acidified；3) negatively charged carbon nanotubes is prepared：The carbon nanotubes of the acidifying of gained in step 2) is added to anionic polyelectrolyte In the aqueous solution of matter or anion surfactant, when ultrasonication 1 is small, under the conditions of 50~60 DEG C of stirred in water bath When reaction 4~10 is small, the concentration of aqueous solution of the anionic polyelectrolyte or anion surfactant is 6~10g/L, described Carbon nanotubes is 1 with the weight ratio of anionic polyelectrolyte or anion surfactant：(0.01~0.06), it is described it is cloudy from Sub- polyelectrolyte is kayexalate, the one or more in sodium lignin sulfonate, the anion surfactant For neopelex, centrifuged after having reacted and remove unreacted anionic polyelectrolyte or anion surface active Agent obtains the carbon nanotubes that surface carries negative electrical charge；4) carbon nanotubes/LDHs compounds are prepared：The carbon nanotubes of gained in step 3) is added to the colloidal sol obtained by step 1) In, the weight ratio of carbon nanotubes and colloidal sol is 1：(25~30), after the mixture of the two is placed in 50~60 DEG C of stirred in water bath Under the conditions of carry out ion-exchange reactions, when the reaction time 6~8 is small, filtering and washing after completion of the reaction is dry, obtain carbon nanotubes/ LDHs compounds.
- 2. the preparation side of carbon nanotubes/LDHs composite materials of metal ion in absorption ultra-pure ammonia according to claim 1 Method, which is characterized in that aluminium salt described in step 1) and magnesium salts are aluminum nitrate and magnesium nitrate, and the aqueous slkali is molten for sodium hydroxide Liquid.
- 3. the preparation side of carbon nanotubes/LDHs composite materials of metal ion in absorption ultra-pure ammonia according to claim 1 Method, which is characterized in that oxidizing acid described in step 2) refers to one or more of nitric acid, sulfuric acid, permanganic acid, hypochlorous acid Mixture.
- 4. the preparation side of carbon nanotubes/LDHs composite materials of metal ion in absorption ultra-pure ammonia according to claim 1 Method, which is characterized in that the carbon nanotubes is single-walled carbon nanotube, one kind in multi-walled carbon nanotube.
- 5. carbon nanotubes/LDHs of metal ion is compound in a kind of absorption ultra-pure ammonia as any one of claim 1-4 The preparation method of material prepares carbon nanotubes/LDHs composite materials of gained.
- 6. a kind of carbon nanotubes as claimed in claim 5/LDHs composite materials metal ion field in ultra-pure ammonia is adsorbed Using.
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| CN111559742A (en) * | 2019-12-25 | 2020-08-21 | 江西悦安新材料股份有限公司 | Method for improving stability of carbon nano tube |
| CN112090378A (en) * | 2020-07-29 | 2020-12-18 | 淮阴工学院 | Preparation method of photo-thermal conversion enhanced microcapsule phase change material |
| CN112683871B (en) * | 2021-01-05 | 2021-09-21 | 江苏雨松环境修复研究中心有限公司 | Soil chromium ion content detection method |
| CN113104872B (en) * | 2021-05-24 | 2022-10-21 | 北京化工大学 | Method for preparing organic molecule intercalation hydrotalcite array by one-step method |
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