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Preparation method and use method of two-dimensional sheet layer material modified MXene/TiO2 composite material

A technology of composite materials and two-dimensional sheets, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve problems such as large band gap, difficulty in forming electron-hole pairs, and application limitations , to achieve the effects of simple preparation process, improved visible light response, and low cost

Inactive Publication Date: 2019-11-12
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to TiO 2 The band gap is large, and it is difficult to form electron-hole pairs. At the same time, the time required for the chemical action of the organic pollutants adsorbed on its surface is usually longer than the time required for the recombination of the excited electron-hole pairs, resulting in its catalytic The efficiency is low, and the application is greatly restricted

Method used

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  • Preparation method and use method of two-dimensional sheet layer material modified MXene/TiO2 composite material
  • Preparation method and use method of two-dimensional sheet layer material modified MXene/TiO2 composite material
  • Preparation method and use method of two-dimensional sheet layer material modified MXene/TiO2 composite material

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Experimental program
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Effect test

Embodiment 1

[0026] Measure 10 mL of 49% HF solution and place it in a polytetrafluoroethylene reactor, weigh 1 g of Ti 3 AlC 2 The powder was slowly added into the HF solution, and after being fully stirred, it was put into an oven, and the temperature was raised to 60°C, and the reaction was performed for 24 h. The obtained powder was washed with deionized water to a pH of about 7, and centrifuged with ethanol three times, and finally the powder was dried in a vacuum oven at 60 °C for 24 h to obtain MXene powder.

[0027] Take a certain amount of MXene and a certain amount of tetrabutyl titanate and place them in a polytetrafluoroethylene reactor, add 0.8mL of 49% HF, and then add 30mL of ethanol, sonicate for 40min, pour them into the reactor, and heat them at 80°C After 24 hours of reaction, MXene / TiO was prepared 2 The complex was washed repeatedly with acetone, deionized water and absolute ethanol, and finally dried in an oven at 60 °C.

[0028] Table 1 Sample formula table

[0...

Embodiment 2

[0033] Measure 10 mL of 49% HF solution and place it in a polytetrafluoroethylene reactor, weigh 1 g of Nb 2 AlC (MoTiAlC 3 、Ti 2 AlC, Nb 4 AlC 3 ) powder was slowly added into the HF solution, stirred thoroughly, put it into an oven, raised the temperature to 60°C, and reacted for 24 hours, then washed the obtained sample with deionized water until the pH was about 7, and centrifuged three times with ethanol, and finally The powder was dried in a vacuum oven at 60 °C for 24 h to obtain MXene powder.

[0034] Other steps remain unchanged, the MXene / TiO 2 composite photocatalyst.

Embodiment 3

[0036]Prepare 20 mg / L rhodamine B solution, take 50 mL each time as the reaction solution, add 20 mg powder sample, and keep stirring the reaction solution throughout the process. In order to achieve adsorption-desorption equilibrium, samples were taken after dark adsorption for 30 min in a dark room. Then put it under xenon lamp irradiation (visible light segment), measure 5 mL samples at regular intervals for UV-visible absorbance test, and obtain the concentration of rhodamine B after different reaction times.

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Abstract

The invention discloses a two-dimensional sheet layer material modified MXene / TiO2 preparation method, wherein MXene comprises Mo2TiC3, Ti3C2, Ti2C, Nb2C, Nb4C3 and the like, and the MXene / TiO2 composite material is prepared by using MXene as a substrate through an in-situ method. The process comprises: preparing a two-dimensional sheet layer material MXene with a good layered structure, adding tetrabutyl titanate to MXene, and adding hydrofluoric acid and absolute ethanol to obtain the MXene / TiO2 composite material with uniformly distributed TiO2. According to the present invention, the preparation process is simple; the TiO2 in the obtained MXene / TiO2 composite material is distributed on the surface and the periphery of the MXene sheet layers, the ratio is adjustable, the visible light absorption of the composite material is enhanced, and the forbidden band width of the composite material is significantly reduced compared with TiO2 so as to easily achieve the electron-hole pair separation; and the novel MXene / TiO2 composite material can be used as a catalyst material in the field of photoelectrocatalysis.

Description

technical field [0001] The invention relates to MXene / TiO modified by a two-dimensional sheet material 2 Methods of making and using composite materials. Background technique [0002] Environmental pollution and energy shortage are the main problems facing mankind today. Therefore, humans have been committed to finding simple and effective catalysts to degrade organic pollutants, reduce greenhouse gas carbon dioxide, and split water to produce hydrogen. Currently, two-dimensional materials such as graphene, MoS 2 Sheet, TiO 2 Sheets, MXene, etc. and their composite materials have been widely studied in improving and governing the environment. [0003] Among them, TiO 2 As a semiconductor material, due to its low price, simple preparation method, low toxicity and other characteristics, it has been deeply studied earlier and applied in the field of photocatalysis. But due to TiO 2 The band gap is large, and it is difficult to form electron-hole pairs. At the same time, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J35/02B01J35/00
CPCB01J27/22B01J37/0018B01J35/39B01J35/00B01J35/30
Inventor 叶晓云陈龙王昭鹏黄培金陈松林永南王乾廷陈文哲
Owner FUJIAN UNIV OF TECH
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