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Oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst and preparation method thereof

A titanium dioxide and photocatalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as photogenerated electrons, incomplete separation of holes, weakened redox ability, and inability to obtain activity, etc. , to achieve the effect of inhibiting the recombination of electrons and holes and enhancing the photocatalytic performance

Pending Publication Date: 2021-11-02
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of catalyst usually does not achieve good activity
This is mainly because Ti 3 C 2 T x It cannot be excited by light to generate electrons and holes, but can only accept electrons, resulting in weakened redox ability and incomplete separation of photogenerated electrons and holes
At the same time, due to the lack of monolayer Ti 3 C 2 T x In the systematic research in the field of photocatalytic hydrogen production, the relationship between its morphology, surface functional groups and other characteristics and photocatalytic hydrogen production activity is not clear enough
This greatly hinders Ti 3 C 2 T x Research exploration in the field of photocatalysis and efficient design of MXenes-based photocatalytic materials

Method used

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  • Oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst and preparation method thereof
  • Oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst and preparation method thereof
  • Oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst and preparation method thereof

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preparation example Construction

[0029] The invention provides a simple and effective preparation method for preparing oxygen-terminated single-layer titanium carbide composite titanium dioxide novel photocatalyst, in order to improve Ti 3 C 2 T x The photocatalytic performance of materials provides a reference method.

[0030] The oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst of the present invention is composed of an oxygen-terminated single-layer Ti 3 C 2 T x TiO with exposed (001) faces 2 Composition, by in situ hydrothermal oxidation method on monolayer Ti 3 C 2 T x Edge-growth (001) surface exposed TiO 2 , when using muffle furnace annealing to increase Ti 3 C 2 T x content of surface oxygen groups. Improvement of single Ti by triple controllable modification of surface functional groups, exposing highly active faces and controlling structure size 3 C 2 T x photocatalytic ability.

[0031] The steps of the preparation method are:

[0032] (1) T...

Embodiment 1

[0040] Measure 25mL of 9mol / L concentrated hydrochloric acid into a 100mL PTFE container, then weigh 1g of LiF powder and dissolve it in the container, and continue magnetic stirring for 30 minutes. After that, 1g Ti 3 AlC 2 Slowly added to the above solution. Because the addition process will release a lot of heat, in order to prevent Ti 3 AlC 2 was oxidized, and the entire addition process lasted 5 minutes. Ti 3 AlC 2 After adding everything, seal with parafilm. Stirring was continued at 35°C for 36 hours to completely etch away the Al layer. After the etching is completed, centrifuge and wash with ultrapure water for 6-8 times until the supernatant is neutral.

[0041] After the last washing, the product was re-dissolved in 50 mL of ultrapure water, and the ice water was sonicated for 1.5 hours under the protection of argon to separate the layers. After sonication, centrifuge at 3500rpm for 1 hour, collect the dark green suspension in the upper layer, freeze-dry ov...

Embodiment 2

[0045] Measure 50mL of 9mol / L concentrated hydrochloric acid into a 100mL PTFE container, then weigh 2g of LiF powder and dissolve it in the container, and continue magnetic stirring for 30 minutes. After that, add 2g Ti 3 AlC 2 Slowly added to the above solution. Because the addition process will release a lot of heat, in order to prevent Ti 3 AlC 2 was oxidized, and the entire addition process lasted 5 minutes. Ti 3 AlC 2 After adding everything, seal with parafilm. Stirring was continued at 30° C. for 48 hours to completely etch away the Al layer. After the etching is completed, centrifuge and wash with ultrapure water for 6-8 times until the supernatant is neutral.

[0046] After the last washing, the product was re-dissolved in 50 mL of ultrapure water, and the ice water was sonicated for 1.5 hours under the protection of argon to separate the layers. After sonication, centrifuge at 3500rpm for 1 hour, collect the dark green suspension in the upper layer, freeze-...

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Abstract

The invention discloses an oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst and a preparation method thereof, and belongs to the technical field of nano composite materials and photocatalysts. The preparation method comprises the following steps: firstly, growing TiO2 with an exposed (001) surface on the edge of single-layer Ti3C2Tx through an in-situ hydrothermal oxidation method; then, through annealing treatment, increasing the content of oxygen groups on the surface of the Ti3C2Tx; obtaining Ti3C2O / (001) TiO2 which is the oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst. According to the prepared oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst, the photocatalytic performance of an existing Ti3C2Tx material is improved.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and photocatalysts, and relates to an oxygen-terminated single-layer titanium carbide composite titanium dioxide photocatalyst and a preparation method thereof. Background technique [0002] With the increasingly serious energy consumption and environmental problems, the global demand for green energy to replace the burning of fossil fuels is growing rapidly. As a fuel, hydrogen has the advantages of high combustion calorific value and no pollution. Accelerating the development of hydrogen energy has become a new focus of my country's energy transformation. Utilizing photocatalyst technology can convert solar energy into sustainable hydrogen energy in an environmentally friendly and efficient manner. [0003] However, the low efficiency of solar energy utilization and the ultrafast recombination of photogenerated electrons and holes largely hinder the application prospects of trad...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/22B01J35/00B01J37/10B01J37/12C01B3/04
CPCB01J27/22B01J21/063B01J37/10B01J37/12C01B3/042B01J35/39Y02E60/36
Inventor 强涛涛陈露
Owner SHAANXI UNIV OF SCI & TECH
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