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Method for immobilizing MXene by covalent bonding of ionic liquid and product thereof

An ionic liquid and covalent bonding technology, applied in the direction of nitrogen compounds, carbon compounds, chemical instruments and methods, etc., can solve the problems of easy redeposition of MXene materials, high energy consumption of modification methods, and few active sites, etc., to achieve Achieve large-scale industrial production, long reaction time, and low loss of ionic liquid

Active Publication Date: 2020-10-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is to provide a method of covalently bonding and immobilizing MXene with ionic liquid and its product, which solves the technical problems that MXene materials are easy to re-stack and have few active sites, and overcomes the current The modification method has the disadvantages of high energy consumption and complicated operation

Method used

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  • Method for immobilizing MXene by covalent bonding of ionic liquid and product thereof
  • Method for immobilizing MXene by covalent bonding of ionic liquid and product thereof
  • Method for immobilizing MXene by covalent bonding of ionic liquid and product thereof

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preparation example Construction

[0028] The present invention provides a preparation method of MXene covalently bonded and immobilized by ionic liquid, which includes the following steps:

[0029] Step 1: Preparation of MXene nanosheets: adding MAX phase material into a fluorine-containing solution for etching and ultrasound to obtain a dispersion of MXene nanosheets.

[0030] Step 2: Take a certain concentration of MXene nanosheet dispersion, ultrasonically disperse uniformly, pass in inert gas, seal, and add an ionic liquid monomer containing unsaturated double bonds to cause radiation grafting reaction with MXene.

[0031] In step three, the product obtained in step two is centrifuged and washed to obtain an ionic liquid covalently bonded and immobilized MXene material.

[0032] The general formula of MXene mentioned in step one is M n+1 X n T x (n=1-3), where M is an early transition metal (Sc, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, etc.), X is carbon and / or nitrogen, and Tx is a surface terminating group ( Such as OH, O...

Embodiment 1

[0045] The preparation method of ionic liquid covalently immobilized MXene includes the following steps:

[0046] Step 1. Preparation of MXene nanosheets: add 1g LiF to a 50mL PTFE container, add 20mL 9MHCl, and stir for 30min at room temperature to obtain a colorless and transparent solution. Weigh 1g Ti3AlC2 and slowly add it to the above solution in batches. Stir at °C for 48 hours, centrifuge the obtained reaction solution (3500 rpm, 5 min) and wash until the pH of the supernatant decanted after centrifugation is above 5, preferably the pH is 5-7, and the precipitate is taken. Add 80mL H2O for ice bath ultrasound (600W, 20min) to collect the upper layer of black rice dumpling liquid, which is a small layer of Ti3C2 Tx dispersion. In order to obtain more small layer of Ti3C2Tx, repeatedly add water to the multilayer Ti3C2Tx and shake the upper layer. Black rice dumpling liquid, preferably, repeat 3 to 5 times to combine the collected black rice dumpling liquid. Obtain single-...

Embodiment 2

[0051] An improvement is made on the basis of the method provided in Example 1, except that the concentration of the ionic liquid is 20 wt%.

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Abstract

The invention belongs to the field of nano functional materials, and discloses a method for immobilizing MXene by covalent bonding of ionic liquid and a product thereof. The preparation method comprises the following steps: adding an MXene material containing -OH, -F and -O end groups into an ionic liquid monomer solution containing unsaturated double bonds, covalently bonding and immobilizing theionic liquid to the surface of the MXene material through an ionizing radiation technology, and performing washing and centrifuging to obtain a series of ionic liquid covalently bonded and immobilized MXene materials containing different structures. The preparation method disclosed by the invention can react at normal temperature, does not need a catalyst, and is quick in reaction, easy to control and low in energy consumption. By the method, the problem of stacking of the MXene nanosheets is solved, and the types of active sites of the MXene nanosheets are enriched or the chemically effective active area of the MXene nanosheets is increased. The synthesized MXene composite material maintains the nano structure of the MXene material, has the advantages of MXene and ionic liquid, and has favorable application prospects in the aspects of energy storage, catalysis, sensing and adsorption.

Description

Technical field [0001] The invention belongs to the field of nano-functional materials, and more specifically, relates to a method for covalently bonding and immobilizing MXene with an ionic liquid and a product thereof. Background technique [0002] Two-dimensional transition metal carbides and nitrides (MXene) are obtained by selectively etching the A atomic layer of the MAX phase in a specific chemical environment. The surface has terminal functional groups such as -OH, -O, -H, and -F. Similar to graphene, it has a large specific surface area, excellent chemical properties, good electrical conductivity, Lewis-acidity, and is widely used in energy storage / conversion, photo / electrocatalysis, chemical sensing, electrostatic shielding and adsorption. However, the MXene sheet structure is prone to re-stacking, resulting in a large loss of active surface area, affecting the diffusion of ions between the layers, thus limiting its application. [0003] Recently, Chinese Patent CN 10944...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/24C01B32/921C01B32/914C01B21/082B82Y30/00B82Y40/00
CPCH01G11/86H01G11/30H01G11/24C01B32/921C01B32/914C01B21/0828B82Y30/00B82Y40/00
Inventor 赵龙文迪谢康俊
Owner HUAZHONG UNIV OF SCI & TECH
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