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Two-dimensional transition metal carbide (nitride) aerogel as well as preparation method and application thereof

A transition metal, aerogel technology, applied in the direction of alkali metal compounds, nitrogen and non-metallic compounds, alkali metal oxides/hydroxides, etc. High specific surface area and other problems, to achieve good adsorption effect, good application prospects, and the effect of large specific surface area

Active Publication Date: 2019-03-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the application of MXene in the field of adsorption, such as the small specific surface area of ​​multilayer MXene, which limits its adsorption capacity; the large specific surface area of ​​monolayer MXene makes it easy to disperse in water and contact with adsorbates, but it is difficult to recover. It is easy to cause secondary pollution, etc.
MXene airgel is a three-dimensional porous structure formed by overlapping MXene nanosheets. As an adsorption material, it not only has the advantages of high specific surface area and high porosity, but also is easy to recycle, which can avoid secondary pollution to the environment. It has great application potential in the field of adsorption, but there is still little research on the preparation and application of MXene airgel
Li et al. successfully prepared MXene aerogels using ethylenediamine as a cross-linking agent, but the three-dimensional pore structure of the prepared aerogels is not developed, which is not conducive to full contact with the adsorbed substances.
[LiL, Zhang M, Zhang X, et al. New Ti 3C 2, aerogel as promising negative electrodematerials for asymmetric supercapacitors [J]. Journal of Power Sources, 2017, 364: 234-241.] Liu et al. combined polyacrylic acid and MXene Mix well, prepare MXene / polyacrylic acid airgel by freeze-drying, and then anneal at 300 °C for 2 h in an argon atmosphere to convert it into MXene / polyimide airgel. The airgel has good mechanical properties, but its The process is complicated, high temperature treatment is required, the cost is high, and polyimide will wrap MXene nanosheets, which is not conducive to making full use of the excellent adsorption performance of MXene

Method used

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  • Two-dimensional transition metal carbide (nitride) aerogel as well as preparation method and application thereof
  • Two-dimensional transition metal carbide (nitride) aerogel as well as preparation method and application thereof
  • Two-dimensional transition metal carbide (nitride) aerogel as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 1g of lithium fluoride and add it to 20mL of 9M hydrochloric acid solution, stir for 20min to form a uniform solution, then slowly add 1g of ternary layered carbide Ti which has passed through a 200 mesh sieve3 AlC 2 Powder, heated in a water bath at 35°C, and stirred magnetically at 400r.p.m for 24h. Then use absolute ethanol and deionized water to alternately centrifuge and wash 6 times (rotating speed is 4000r.p.m, centrifuge 10min each time), until the supernatant pH=6.2, obtain multilayer Ti 3 C 2 T x . The resulting multilayer Ti 3 C 2 T x Disperse in 50mL deionized water, vortex for 20min, and centrifuge at 1500r.p.m for 1h to remove uncorroded Ti 3 AlC 2 and multilayer Ti 3 C 2 T x , take the above suspension and centrifuge at 4500r.p.m for 1h to obtain single or few layers of Ti 3 C 2 T x Nanosheet precipitation.

[0026] (2) Ti obtained in the above steps 3 C 2 T x The nanosheet precipitate was redispersed in water, and its concentra...

Embodiment 2

[0030] (1) Weigh 0.5g lithium fluoride and add it into 10mL 9M hydrochloric acid solution, stir for 20min to form a uniform solution, then put 0.5g of Ti 3 AlC 2 The powder was slowly added into the lithium fluoride hydrochloride solution, heated in a water bath at 40°C, and stirred by magnetic force at 400r.p.m for 20h. Then use absolute ethanol and deionized water to alternately centrifuge and wash 6 times (rotating speed is 4000r.p.m, centrifuge 10min each time), until the supernatant pH=6.5, obtain multilayer Ti 3 C 2 T x . The resulting multilayer Ti 3 C 2 T x Disperse in 25mL deionized water, vortex for 10min, and centrifuge at 1500r.p.m for 2h to remove uncorroded Ti 3 AlC 2 and multilayer Ti 3 C 2 T x , take the above suspension and centrifuge at 3500r.p.m for 2h to obtain single or few layers of Ti 3 C 2 T x Nanosheet precipitation.

[0031] (2) Ti obtained in the above steps 3 C 2 T x The nanosheet precipitate was redispersed in water, and its conce...

Embodiment 3

[0035] (1) Weigh 1g of lithium fluoride and add it to 20mL of 9M hydrochloric acid solution, stir for 20min to form a uniform solution, then slowly add 1g of ternary layered carbide Ti which has passed through a 200 mesh sieve 3 AlC 2 Powder, heated in a water bath at 30°C, and stirred with magnetic force at 300r.p.m for 48h. Then use absolute ethanol and deionized water to alternately centrifuge and wash 6 times (rotating speed is 5000r.p.m, centrifuge 5min each time), until the supernatant pH=6.4, obtain multilayer Ti 3 C 2 T x . Disperse the obtained multilayer in 100mL deionized water, shake it by hand for 60min, and centrifuge at 1500r.p.m for 1h to remove uncorroded Ti 3 AlC 2 and multilayer Ti 3 C 2 T x , take the above suspension and centrifuge it at 3500r.p.m for 1h to obtain monolayer or few layers of Ti 3 C 2 T x Nanosheet precipitation.

[0036] (2) Ti obtained in the above steps 3 C 2 T x The nanosheet precipitate was redispersed in water, and its c...

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Abstract

The invention discloses a two-dimensional transition metal carbide (nitride) aerogel as well as a preparation method thereof and application thereof. A HCl (Hydrochloric acid)+LiF (LithiumFluoride) solution is adopted to corrode a ternary layered carbide (nitride) MAX powder, and stable colloidal-state suspension liquid of two-dimensional transition metal carbide (nitride) nano sheets is obtainedby washing and stripping. A hydrochloric acid solution is added to break electrostatic equilibrium between the two-dimensional transitionp metal carbide (nitride) nano sheets, and the two-dimensionaltransition metal carbide (nitride) nano sheets are guided to be self-assembled to form hydrogel, and finally, vacuum freeze-drying is performed to obtain the two-dimensional transition metal carbide (nitride) aerogel. The prepared aerogel has a high specific surface area and developed holes, has adsorption capacity of 246 mg / g to lead ions, has adsorption capacity of 17 g / g to methylbenzene, and is an ideal adsorption material. The preparation method disclosed by the invention is simple and safe, is easy to control, and is suitable for large-scale industrial production; and the prepared two-dimensional transition metal carbide (nitride) aerogel has a good application prospect in the field of adsorption.

Description

technical field [0001] The invention belongs to the field of nanometer materials and adsorption, and in particular relates to a two-dimensional transition metal carbon (nitride) compound airgel and its preparation method and application. Background technique [0002] In recent years, with the rapid development of industry, we are facing increasingly serious environmental problems, especially heavy metal ions and organic pollution of water resources caused by industries such as metallurgy, electroplating, and textiles, which have had a great impact on the natural environment and human health. harm. Therefore, controlling the pollution of water resources has become an urgent need. Adsorption is a commonly used method for water treatment. It uses the high specific surface area, porous structure and abundant active sites of the adsorbent to absorb heavy metal ions or organic substances in water into its pore structure through physical and chemical actions. Simple and safe, wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/921C01B32/907C01B32/914C01B32/949C01B21/082B01J20/02B01J20/28B01J20/30C02F1/28B82Y40/00C02F101/20C02F101/30
CPCB01J20/0259B82Y40/00C01B21/0828C01B32/907C01B32/914C01B32/921C01B32/949C02F1/281B01J20/28047B01J20/28054C02F2101/30C02F2101/20
Inventor 潘丽梅王贺贺李文龙任斌张祥刘超杨建丘泰
Owner NANJING UNIV OF TECH
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