CN105771971A - Method for loading high-dispersion precious metals and alloy nanoparticles on surface of carbon nanotube - Google Patents
Method for loading high-dispersion precious metals and alloy nanoparticles on surface of carbon nanotube Download PDFInfo
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- CN105771971A CN105771971A CN201410813603.3A CN201410813603A CN105771971A CN 105771971 A CN105771971 A CN 105771971A CN 201410813603 A CN201410813603 A CN 201410813603A CN 105771971 A CN105771971 A CN 105771971A
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Abstract
The invention discloses a method for loading high-dispersion precious metals (including Pt, Ru, Pd, Au and Ag) and alloy nanoparticles thereof on the surface of a carbon nanotube. The method comprises the following steps: (1) modifying the surface of the carbon nanotube with an imidazole ionic liquid polymer membrane through free radical polymerization; (2) uniformly mixing precious metal precursor salts with the carbon nanotube modified by the imidazole ionic liquid polymer membrane in an aqueous solution through ultrasonic treatment or stirring; and (3) reducing the precious metal precursors uniformly adsorbed on the surface of the carbon nanotube into precious metal nanoparticles by using a reducing agent. The invention has the advantages that precious metal nanoparticles with the advantages of high dispersion, small particle sizes and narrow particle size distribution are loaded on the surface of the carbon nanotube so as to improve the catalytic activity of the precious metal nanoparticles and the utilization rate of precious metals. The carbon nanotube material loaded with high-dispersion precious metal nanoparticles is extensively applied to the fields of electrochemical energy transfer and catalysis.
Description
Technical field
The present invention relates to material science, be specifically related to a kind of at carbon nano tube surface load high dispersive noble metal and alloy nanoparticle submethod.
Background technology
CNT includes multi-walled carbon nano-tubes and SWCN is all very important material with carbon element.Since within 1991, being found by Japanese Scientists Iijima [IijimaS,Nature354,56 (1991)], scientific circles' interest widely such as whole world physics, chemistry and material are caused.Due to the specific surface area that CNT tool is bigger, high electric conductivity, excellent chemistry and electrochemical stability, the advantages such as regulatable nanotube cavity configuration, big draw ratio, therefore CNT is widely used in hydrogen storage material, field emission material, battery material, reinforced composite, sensor material, catalyst carrier material etc..
CNT has perfect graphite-structure, and the CNT that surface atom valence link is saturated is being chemically sufficiently stable, it is believed that be the precious metal catalyst agent carrier of function admirable.But also just because of this perfect graphite-structure of CNT, CNT is made to have very strong hydrophobicity, can not by the surface tension liquid-soaked more than 100～200mN/m, most of noble metal nano particles cannot support the surface of CNT, when sonic oscillation, stirring or heating, noble metal nano particles is easy to come off and reunion is grown up.So generally first its surface will be carried out the oxidation processes of appropriateness before using CNT, introduce the functional groups such as hydroxyl, carboxyl, aldehyde radical at CNT tube wall.These functional groups can increase the hydrophilic of CNT and become the active sites of noble metal nano particles deposition, make noble metal nano particles can be adsorbed on carbon nano tube surface.The method of this strong acid oxidation processes can only introduce functional group in the defective bit of carbon nano tube surface, so the surface functional group limited amount introduced, it is distributed also uneven, make the noble metal nano particles carbon nano tube surface bad dispersibility in this strong acid oxidation processes of deposition, especially substantial amounts of noble metal nano particles aggregation is there will be when high capacity amount, thus affecting activity [HsinYL, the et.al of noble metal catalystJ.Am.Chem.Soc.129,9999,(2007)].Additionally, the method for strong acid oxidation processes destroys the surface texture of CNT, reduce further the corrosion resistance of CNT, noble metal nano particles can come off from surface because of CNT corrosion in use, reduces the service life of catalyst.
Summary of the invention
It is an object of the invention to there is bad dispersibility for carbon nanotube loaded noble metal catalyst, the shortcoming that noble metal utilisation is low, it is provided that a kind of at carbon nano tube surface load high dispersive noble metal and alloy nanoparticle submethod.Described method is characterized in that modifying one layer of imidazole type ion liquid polymeric film by Raolical polymerizable in carbon nano tube surface can create, in carbon nano tube surface, the active sites that equally distributed imidazole functionalities deposits as noble metal nano particles, avoids carbon nano tube structure simultaneously and destroys.Noble metal nano particles is achieved at the dispersed of carbon nano tube surface and low particle size, thus improve thus improving catalysis activity and the noble metal utilisation of noble metal nano particles by the coordination between imidazole functionalities and noble metal nano particles.The inventive method process is simple, it is easy to control.The present invention is achieved by the following scheme:
A kind of at carbon nano tube surface load high dispersive noble metal and alloy nanoparticle submethod, it is characterised in that to comprise the following steps:
(1) CNT is added in a certain amount of organic solvent；
(2) in step (1) gained solution, a certain amount of imidazole type ion liquid monomer and azodiisobutyronitrile are added；
(3) cool down after step (2) gained solution is heated under inert atmosphere and uniform temperature certain time.
(4) step (3) gained solution centrifugal is separated, use a certain amount of organic solvent washing final vacuum for several times to dry.
In described method, the organic solvent added with CNT is also carried out ultrasonic and stirring by step (1), and ultrasonic time is 1-300min, and mixing time is 0.5-6h, and described organic solvent is methanol or ethanol.
In described method, step (2) is also to added with CNT, and the organic solvent of imidazole type ion liquid monomer and azodiisobutyronitrile is stirred, and mixing time is 0.5-6h;Imidazole type ion liquid monomer can be 1-vinyl-3-ethyl imidazol(e) bromine salt, 1-vinyl-3-ethyl imidazol(e) tetrafluoroborate or 1-pi-allyl-3-ethyl imidazol(e) tetrafluoroborate, and its quality can be the 5-800% of carbon nanotube mass；The quality of azodiisobutyronitrile is the 1-100% of ionic liquid monomer quality.
In described method, the inert atmosphere that step (3) uses can be nitrogen or argon；Heating-up temperature is 50-140 DEG C；Heat time heating time is 2-48h.
In described method, it is characterised in that the organic solvent used by step (4) washing can be methanol, ethanol or oxolane.
It is an advantage of the current invention that imidazole type ion liquid polymerization can at carbon nano tube surface homogeneous film formation, thickness is controlled.Imidazole functionalities can produce strong Chemical bonding with many noble metals (such as gold, platinum, ruthenium etc.), thus noble metal nano particles can by imidazole functionalities equably, be firmly anchored to carbon nano tube surface, thus well solving noble metal nano particles at carbon nano tube surface bad dispersibility, the technical barrier that catalysis activity is low.Be capable of a large amount of preparations of catalyst also with technical scheme, this carbon nanotube loaded high dispersive precious metal nano-particle catalyst is changed to have with catalytic field at electrochemical energy and is used widely.
Accompanying drawing explanation
Fig. 1 is the transmission electron microscope picture of the CNT platinum catalyst of the present invention.
Detailed description of the invention
Below in conjunction with some detailed description of the invention, the invention will be further described.
Embodiment 1:
1g carbon nanotube powder joins in 25ml methanol, sonic oscillation 25min, stirs 30min, is subsequently adding 1g1-vinyl-3-ethyl imidazol(e) bromine salt and 50mg azodiisobutyronitrile, stirs 20min.Gained solution is at 65C, N2Heating 24h under atmosphere, centrifugation after cooling, with absolute ethanol washing 3 times.Finally the CNT handled well is put into vacuum drying oven to dry.
Embodiment 2:
1g carbon nanotube powder joins in 25ml methanol, sonic oscillation 60min, stirs 1h, is subsequently adding 500mg1-vinyl-3-ethyl imidazol(e) tetrafluoroborate and 50mg azodiisobutyronitrile, sonic oscillation 1h.Gained solution is at 60C, N2Heat 12h, centrifugation after cooling under atmosphere, wash 3 times with absolute methanol.Finally the CNT handled well is put into vacuum drying oven to dry.
Embodiment 3:
1g carbon nanotube powder joins in 50ml ethanol, sonic oscillation 30min, stirs 1h, is subsequently adding 2g1-pi-allyl-3-ethyl imidazol(e) tetrafluoroborate and 400mg azodiisobutyronitrile, sonic oscillation 1.5h.Gained solution heats 48h under 75C, Ar atmosphere, centrifugation after cooling, with absolute ethanol washing 3 times.Finally the CNT handled well is put into vacuum drying oven to dry.
Embodiment 4:
1g carbon nanotube powder joins in 30ml methanol, sonic oscillation 10min, stirs 1.5h, is subsequently adding 100mg1-pi-allyl-3-ethyl imidazol(e) tetrafluoroborate and 8mg azodiisobutyronitrile, stirs 3h.Gained solution heats 32h under 65C, Ar atmosphere, and centrifugation after cooling, with absolute ethanol washing 3.Finally the CNT handled well is put into vacuum drying oven and dries secondary.
Loaded catalyst of the present invention, adopts the preparations such as microwave radiation heat reduction method, sodium borohydride reduction, formaldehyde reducing process, ethylene glycol circumfluence method.
Embodiment 5:
Take the 200mg CNT processed by embodiment 1 as, in the reactor of 100ml, adding 50ml ethylene glycol, ultrasonic agitation 30min, instill the H of 38.6mM/L2PtCl6Solution 6.65ml, subsequently sonic oscillation 30min, be placed in microwave oven by above-mentioned reactor, microwave heating 10 minutes under output 800W.Removal reactor, is cooled to room temperature.Centrifugation, respectively washs 3 times with acetone and distilled water, finally the CNT handled well is put into vacuum drying oven and dry.The sample thus obtained is the supported catalyst containing Pt20%, and the granule of platinum is about 2.0nm.Fig. 1 is shown that the transmission electron microscope photo of this sample, can see that from photo, and nano platinum particle distributes very evenly in carbon nano tube surface, and average-size is 2nm.
Embodiment 6:
Take the 400mg CNT processed by embodiment 1 as, in the reactor of 100ml, adding 50ml ethylene glycol, ultrasonic agitation 30min, instill the H of 38.6mM/L2PtCl6The RuCl of solution 23.34ml and 48.2mM/L3Solution 18.69ml, subsequently sonic oscillation 30min, be placed in oil bath by above-mentioned reactor, 140 DEG C of heating 2h.Removal reactor, is cooled to room temperature.Centrifugation, respectively washs 3 times with acetone and distilled water, finally the CNT handled well is put into vacuum drying oven and dry.The sample thus obtained is the supported catalyst containing PtRu40%, and the nano-particle of platinum ruthenium is about 1.5nm.
Embodiment 7:
Take the 200mg CNT processed by embodiment 2 as, in the reactor of 250ml, adding 100ml distilled water, stir 1h, instill the HAuCl of 50mM/L4Solution 13.54ml, subsequently sonic oscillation 2h, stir, while being slowly added dropwise the NaBH that brand-new concentration is 0.1M/L in ice-water bath4Solution 80ml, is stirred for 2h.Centrifugation, respectively washs 3 times with acetone and distilled water, finally the CNT handled well is put into vacuum drying oven and dry.The sample thus obtained is the supported catalyst containing Au20%, and the size of golden nanometer particle is about 3.8nm.
Embodiment 8:
Take the 200mg CNT processed by embodiment 3 as, in the reactor of 250ml, adding 100ml distilled water, ultrasonic agitation 30min, instill the PdCl of 50mM/L2Solution 9.4ml, subsequently sonic oscillation 2h, stirring in ice-water bath, while being slowly added dropwise the HCHO solution 100ml that brand-new concentration is 500mM/L, being stirred for 2h.Centrifugation, respectively washs 3 times with acetone and distilled water, finally the CNT handled well is put into vacuum drying oven and dry.The sample thus obtained is the supported catalyst containing Pd20%, and the size of Pd nano particle is about 4.0nm.
Embodiment 9:
Take the 200mg CNT processed by embodiment 4 as, in the reactor of 250ml, adding 100ml distilled water, ultrasonic agitation 30min, instill the AgNO of 200mM/L3Solution 2.5ml, subsequently sonic oscillation 2h, stir in ice-water bath, and fast drop brand-new concentration is the NaBH of 0.1M/L on one side4Solution 20ml, is stirred for 2h.Centrifugation, respectively washs 3 times with acetone and distilled water, finally the CNT handled well is put into vacuum drying oven and dry.The sample thus obtained is the supported catalyst containing Ag20%, and the size of Nano silver grain is about 6.0nm.
Claims (6)
1. the method for a carbon nanotube loaded high dispersive noble metal and alloy nano particle thereof, it is characterised in that comprise the following steps:
CNT is added in a certain amount of organic solvent；
A certain amount of imidazole type ion liquid monomer and azodiisobutyronitrile is added in step (1) gained liquid；
Cool down after step (2) gained solution is heated under inert atmosphere and uniform temperature certain time.
2. step (3) gained solution centrifugal is separated, use a certain amount of organic solvent washing final vacuum for several times to dry.
3. method according to claim 1, it is characterised in that the organic solvent added with CNT is also carried out ultrasonic and stirring by step (1), and ultrasonic time is 1-300min, and mixing time is 0.5-6h, and described organic solvent is methanol or ethanol.
4. method according to claim 1, it is characterised in that step (2) is also to added with CNT, and the organic solvent of imidazole type ion liquid monomer and azodiisobutyronitrile is stirred, and mixing time is 0.5-6h;Imidazole type ion liquid monomer can be 1-vinyl-3-ethyl imidazol(e) bromine salt, 1-vinyl-3-ethyl imidazol(e) tetrafluoroborate or 1-pi-allyl-3-ethyl imidazol(e) tetrafluoroborate, and its quality can be the 5-800% of carbon nanotube mass；The quality of azodiisobutyronitrile is the 1-100% of ionic liquid monomer quality.
5. method according to claim 1, it is characterised in that the inert atmosphere that step (3) uses can be nitrogen or argon；Heating-up temperature is 50-140 DEG C；Heat time heating time is 2-48h.
6. method according to claim 1, it is characterised in that the organic solvent used by step (4) washing can be methanol, ethanol or oxolane.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108677211A (en) * | 2018-05-18 | 2018-10-19 | 辽宁大学 | Carbon nano-tube/poly closes ionic liquid/copper complex complex light anode catalyst system and catalyzing and its application |
| CN109179379A (en) * | 2018-11-01 | 2019-01-11 | 中山大学 | A kind of Specific surface area carbon material and its preparation method and application with carbon nanotube core@amorphous carbon shell unit |
| CN109876859A (en) * | 2019-03-26 | 2019-06-14 | 西南大学 | A kind of composite material and preparation method of ion liquid functionalization carbon nanotube |
| CN110038567A (en) * | 2019-04-26 | 2019-07-23 | 江苏扬农化工集团有限公司 | A kind of method of copper/carbon nano-tube catalyst prepared and its recycling design of HPPO is purified |
| CN110484745A (en) * | 2019-08-27 | 2019-11-22 | 浙江工业大学 | A kind of method of noble metal in noble metal leaching agent and recycling dead catalyst |
| CN111500001A (en) * | 2020-06-12 | 2020-08-07 | 南京工业大学 | Preparation method and application of carbon nanotube nano composite material |
| CN112946000A (en) * | 2021-02-01 | 2021-06-11 | 江南大学 | Carbon-loaded metal nanoparticle material based on metal ionic liquid, preparation method thereof and pesticide residue detection method |
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2014
- 2014-12-24 CN CN201410813603.3A patent/CN105771971A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108677211A (en) * | 2018-05-18 | 2018-10-19 | 辽宁大学 | Carbon nano-tube/poly closes ionic liquid/copper complex complex light anode catalyst system and catalyzing and its application |
| CN108677211B (en) * | 2018-05-18 | 2019-11-29 | 辽宁大学 | Carbon nano-tube/poly closes ionic liquid/copper complex complex light anode catalyst system and its application |
| CN109179379A (en) * | 2018-11-01 | 2019-01-11 | 中山大学 | A kind of Specific surface area carbon material and its preparation method and application with carbon nanotube core@amorphous carbon shell unit |
| CN109179379B (en) * | 2018-11-01 | 2021-11-30 | 中山大学 | Carbon material with nano-network structure and carbon nanotube core @ functional amorphous carbon shell unit, and preparation method and application thereof |
| CN109876859A (en) * | 2019-03-26 | 2019-06-14 | 西南大学 | A kind of composite material and preparation method of ion liquid functionalization carbon nanotube |
| CN109876859B (en) * | 2019-03-26 | 2021-08-06 | 西南大学 | Composite material of ionic liquid functionalized carbon nanotube and preparation method thereof |
| CN110038567A (en) * | 2019-04-26 | 2019-07-23 | 江苏扬农化工集团有限公司 | A kind of method of copper/carbon nano-tube catalyst prepared and its recycling design of HPPO is purified |
| CN110484745A (en) * | 2019-08-27 | 2019-11-22 | 浙江工业大学 | A kind of method of noble metal in noble metal leaching agent and recycling dead catalyst |
| CN111500001A (en) * | 2020-06-12 | 2020-08-07 | 南京工业大学 | Preparation method and application of carbon nanotube nano composite material |
| CN111500001B (en) * | 2020-06-12 | 2022-04-12 | 南京工业大学 | Preparation method and application of carbon nanotube nano composite material |
| CN112946000A (en) * | 2021-02-01 | 2021-06-11 | 江南大学 | Carbon-loaded metal nanoparticle material based on metal ionic liquid, preparation method thereof and pesticide residue detection method |
| CN112946000B (en) * | 2021-02-01 | 2022-08-30 | 江南大学 | Carbon-loaded metal nanoparticle material based on metal ionic liquid, preparation method thereof and pesticide residue detection method |
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Application publication date: 20160720 |