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MXene/titanium dioxide nanotube composite material photocatalyst and preparation method thereof

A technology of titanium dioxide and composite materials, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of adverse effects on photocatalytic activity, small specific surface area, and impact on Schottky barriers, etc. Achieve the effect of good product appearance, high photocatalytic activity and mild conditions

Active Publication Date: 2020-11-13
HANGZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently about TiO 2 The titanium dioxide produced in the composite preparation of photocatalysts with MXene is basically granular. Compared with tubes and sheets, the specific surface area is small, which greatly affects the formation of Schottky barriers. adversely affect the photocatalytic activity of

Method used

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  • MXene/titanium dioxide nanotube composite material photocatalyst and preparation method thereof
  • MXene/titanium dioxide nanotube composite material photocatalyst and preparation method thereof
  • MXene/titanium dioxide nanotube composite material photocatalyst and preparation method thereof

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preparation example Construction

[0033] A kind of preparation method of MXene / titanium dioxide nanotube composite material photocatalyst, comprises the following steps:

[0034] a) Preparation of MXene materials:

[0035] Add LiF to 8-10mol / L hydrochloric acid solution and mix evenly, add Ti 3 AlC 2 Solid powder and mix evenly, each 30mL hydrochloric acid solution corresponds to 0.7-0.9g LiF powder and 0.9-1.2g Ti 3 AlC 2 Solid powder, 30~40℃ constant temperature reaction for 44~52 hours to get the reaction product, wash the reaction product until neutral, disperse the washed product in water, pass through N 2 / Ar and ultrasonic for 2 to 4 hours, centrifuge the product after ultrasonic treatment and take the supernatant, add 0.8 to 1.2 mol / L sodium hydroxide solution with a concentration equal to the volume of the supernatant to the supernatant, and let stand to obtain Precipitate, wash the precipitate to neutrality, and freeze-dry to obtain MXene material (monolayer MXene material);

[0036] b) Preparat...

Embodiment 1

[0039] a) Preparation of MXene:

[0040] 1) Prepare 30ml of HCl solution with a concentration of 9mol / L in a polytetrafluoroethylene beaker, weigh 0.8g of LiF powder into it, stir and mix evenly;

[0041] 2) Weigh 1g Ti 3 AlC 2 For solid powder, slowly add the above solution several times, stir and mix evenly, put it in an oil bath at 35°C and stir for 48 hours at a constant temperature;

[0042] 3) Use a high-speed centrifuge to wash the product after the reaction at a speed of 4000 rpm to remove the mucus, and then wash it repeatedly with distilled water until neutral;

[0043] 4) Disperse all the mucus washed to neutral in 100mL H 2 O, pass N 2 / Ar, ultrasonic for 2.5 hours at the same time, and then the sample solution was centrifuged at 4000rpm for 1 hour;

[0044] 5) After centrifugation, take the upper layer solution and add an equal volume of 1mol / L NaOH solution, flocculate, let it stand for 3 hours to obtain a precipitate, wash the precipitate with distilled water...

Embodiment 2

[0052] a) Preparation of MXene:

[0053] 1) Prepare 30ml of HCl solution with a concentration of 8mol / L in a polytetrafluoroethylene beaker, weigh 0.9g of LiF powder into it, stir and mix evenly;

[0054] 2) Weigh 1.2g Ti 3 AlC 2 For solid powder, slowly add the above solution several times, stir and mix evenly, put it in an oil bath at 30°C and stir for 44 hours at a constant temperature;

[0055] 3) Use a high-speed centrifuge to wash the product after the reaction at a speed of 4000 rpm to remove the mucus, and then wash it repeatedly with distilled water until neutral;

[0056] 4) Disperse all the mucus washed to neutral in 100mL H 2 O, pass N 2 / Ar, ultrasonic for 2 hours at the same time, and then the sample solution was centrifuged at 4000rpm for 1 hour;

[0057] 5) After centrifugation, take the upper layer solution and add an equal volume of 0.8mol / L NaOH solution, flocculate, let it stand for 3 hours to obtain a precipitate, wash the precipitate with distilled w...

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Abstract

The invention belongs to the technical field of catalysts, and discloses an MXene / titanium dioxide nanotube composite material photocatalyst, which is prepared by compounding an MXene material and a titanium dioxide nanotube. The invention also discloses a preparation method of the MXene / titanium dioxide nanotube composite material photocatalyst. The preparation method comprises two steps: preparation of an MXene material and preparation of an MXene / titanium dioxide nanotube composite material. Due to the a unique layered structure of MXene, the response range of titanium dioxide to light is expanded, and the electron-hole separation rate is increased, so that the photocatalyst generates higher photocatalytic activity under the action of visible light, and has a wide application prospect in the field of photocatalysis. The provided synthesis method has the characteristics of simple process, low energy consumption, mild conditions, good product morphology and the like, and is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an MXene / titanium dioxide nanotube composite material photocatalyst and a preparation method thereof. Background technique [0002] With the development of industrialization, the problem of energy shortage and environmental pollution is becoming more and more serious, which forces people to constantly look for clean and sustainable energy to improve environmental and energy issues. Hydrogen is generally recognized as a clean energy carrier. Photocatalytic hydrogen production technology is one of the important hydrogen production methods with good development prospects and application prospects. It can greatly realize the conversion of solar energy to chemical energy, and it is also environmentally friendly and stable. TiO 2 It is one of the most promising photocatalysts that has been widely concerned at present. Due to its high photocatalytic performance, high oxidation effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 高鹏池倩倩李笑宇陈钰慧王馨仪吴寅菊
Owner HANGZHOU NORMAL UNIVERSITY
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