Preparation method of two-dimensional titanium carbide/two-dimensional graphite phase carbon nitride nanosheet heterojunction and application of heterojunction in photocatalytic reduction of CO2

A technology of graphite phase carbon nitride and two-dimensional titanium carbide, which is applied in the direction of carbon monoxide, hydrocarbon production from carbon oxides, physical/chemical process catalysts, etc., can solve time-consuming and cumbersome, low yield of ultra-thin titanium carbide nanosheets, Waste of raw materials and other problems, to achieve the effect of short time consumption, alleviating energy crisis, and easy operation

Pending Publication Date: 2020-06-02
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method is time-consuming and cumbersome, and the yield of ultra-thin titanium carbide nanosheets is extremely low, which wastes raw materials.
So far, no one has reported the preparation of ultrathin two-dimensional TiC / CN heterojunctions by one-step calcination of bulk multilayer TiC and CN precursors.

Method used

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  • Preparation method of two-dimensional titanium carbide/two-dimensional graphite phase carbon nitride nanosheet heterojunction and application of heterojunction in photocatalytic reduction of CO2
  • Preparation method of two-dimensional titanium carbide/two-dimensional graphite phase carbon nitride nanosheet heterojunction and application of heterojunction in photocatalytic reduction of CO2
  • Preparation method of two-dimensional titanium carbide/two-dimensional graphite phase carbon nitride nanosheet heterojunction and application of heterojunction in photocatalytic reduction of CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A highly visible photocatalytic reduction of CO 2 Preparation method of active ultrathin two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet heterojunction:

[0031] Take 10mg of titanium carbide powder and disperse it into 20mL urea solution (500g L -1), ultrasonicated for 2 h in an ice-water bath to obtain a homogeneous mixture. Dry the mixed solution at 60°C to obtain a titanium carbide-urea precursor. TiC-urea precursor in N 2 Atmosphere, at 10℃·min -1 The heating rate was raised to 550°C and then heat-preserved and calcined for 2 hours to obtain an ultra-thin two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet heterojunction catalyst (the catalyst is marked as 10TC), and the yield should be 100%, because there is no separation loss in the process.

[0032] The specific surface area of ​​the composite catalyst 10TC sample is 45.9m 2 g -1 , whose photocatalytic reduction of CO 2 The con...

Embodiment 2

[0034] A preparation method of ultra-thin two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet heterojunction with high activity in visible light catalytic reduction of carbon dioxide:

[0035] In order to investigate the effect of the addition of TiC on the photocatalytic reduction of CO over ultrathin 2D TiC / 2D graphite phase carbon nitride nanosheet heterojunction catalysts 2 In terms of performance, except that the amount of titanium carbide added was changed to 5 mg, the preparation method of the catalyst was exactly the same as in Example 1, and the obtained sample was marked as 5TC.

[0036] The specific surface area of ​​the composite catalyst 5TC sample is 37.6m 2 g -1 , whose photocatalytic reduction of CO 2 The conversion rate is 1.75 μmol h -1 g -1 (CO and CH 4 The formation rates of are 1.72 and 0.030 μmol·h, respectively -1 g -1 ).

Embodiment 3

[0038] A preparation method of ultra-thin two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet heterojunction with high activity in visible light catalytic reduction of carbon dioxide:

[0039] In order to investigate the effect of the addition of TiC on the photocatalytic reduction of CO over ultrathin 2D TiC / 2D graphite phase carbon nitride nanosheet heterojunction catalysts 2 The impact on performance, except that the addition of titanium carbide was changed to 15 mg, the preparation method of the catalyst was exactly the same as in Example 1, and the obtained sample was marked as 15TC.

[0040] The specific surface area of ​​composite catalyst 15TC sample is 41.1m 2 g -1 , whose photocatalytic reduction of CO 2 The conversion rate is 3.98μmol·h -1 g -1 (CO and CH 4 The formation rates of are 3.95 and 0.034 μmol·h, respectively -1 g -1 ).

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Abstract

The invention belongs to the technical field of preparation of new materials, and concretely discloses a preparation method of an ultrathin two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet visible light heterojunction catalytic material. The preparation method comprises the following steps: (1) etching Ti3AlC2 with HF acid to remove an Al layer in order to obtain a Ti3C2 (titanium carbide) powder; (2) dispersing the obtained titanium carbide powder into a urea solution, carrying out ultrasonic treatment in an ice-water bath for 2 h to uniformly dispersethe titanium carbide powder, and then drying the obtained dispersion to obtain a titanium carbide-urea precursor; and (3) calcining the titanium carbide-urea precursor powder at 550 DEG C in a N2 atmosphere for 2 h to obtain the ultrathin two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet heterojunction. The method is simple in process and low in cost, and theobtained product is excellent in carbon dioxide reduction performance and has wide application prospects in the field of relieving energy crisis and greenhouse effect in China.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, in particular to a preparation method of a two-dimensional titanium carbide / two-dimensional graphite phase carbon nitride nanosheet heterojunction with high visible light catalytic activity, and its catalytic performance in visible light for CO 2 Converting apps. Background technique [0002] The rapid development of human society has increased the demand for non-renewable fossil fuels. Excessive consumption of fossil fuels releases large amounts of CO into the environment 2 , leading to the greenhouse effect and energy crisis. These problems have seriously hindered the sustainable development of human beings. In recent years, the CO 2 The conversion into high value-added chemical energy such as methane, methanol, carbon monoxide, etc. has attracted extensive attention of researchers. [0003] Currently, the CO 2 The methods of converting into chemical energy include ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C01B32/40C07C1/12C07C9/04
CPCB01J27/24B01J35/004B01J35/1014C07C1/12C01B32/40C07C9/04
Inventor 吕康乐杨超张苏舒黄仪李覃丁耀彬雷鸣王成俊孙杰叶恒朋
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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