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TiO2 composite material and preparation method thereof

A composite material and quantum dot technology, which is applied in the field of photocatalytic composite material preparation, can solve the problems of low quantum efficiency, low carrier separation efficiency, and affecting the photocatalytic performance of titanium dioxide materials, and achieve good light absorption and photocatalytic activity. Photocatalytic activity, photocatalytic activity improvement effect

Pending Publication Date: 2021-11-26
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the current modification of titanium dioxide has low quantum efficiency and low carrier separation efficiency, which affects the photocatalytic performance of titanium dioxide materials.

Method used

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  • TiO2 composite material and preparation method thereof
  • TiO2 composite material and preparation method thereof
  • TiO2 composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 0.1g NCQDs / TiO described in this embodiment 2 @Ti 3 C 2 The preparation method of composite material specifically comprises the following steps:

[0063] (1) Preparation of Ti 3 C 2 T x :

[0064] Add 100mL of HF solution with a mass concentration of 49% in a 250mL polytetrafluoroethylene double-necked flat-bottomed flask, and then add 10g of Ti 3 AlC 2 The powder was slowly added to the flask in batches; the resulting mixture was stirred and reacted at 60°C for 12 hours; after the reaction was completed, the suspension was washed five times with deionized water to make the pH value above 6.5, and then rinsed with ethanol three times or above; finally, put the separated precipitate in a vacuum oven at 60°C to dry overnight and grind to obtain Ti 3 C 2 T x ;

[0065] (2) Preparation of NCQDs:

[0066] Add 3g of citric acid into the beaker, add 0.10g of urea, then add 15mL of deionized water, stir to dissolve the drug completely, pour the mixed solution into a...

Embodiment 2

[0077] NCQDs / TiO described in this example 2 @Ti 3 C 2 The only difference between the preparation method of the composite material and Example 1 is: in step (2), the addition of urea is 0.02g, and the NCDs / TiO 2 @Ti 3 C 2 Composite material, calculated as 0.02g NCQDs / TiO 2 @Ti 3 C 2 .

Embodiment 3

[0079] NCQDs / TiO described in this example 2 @Ti 3 C 2 The only difference between the preparation method of the composite material and Example 1 is: in step (2), the addition of urea is 0.25g, and the NCDs / TiO 2 @Ti 3 C 2 Composite material, calculated as 0.25g NCQDs / TiO 2 @Ti 3 C 2 .

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Abstract

The invention discloses a TiO2 composite material and a preparation method thereof, which belong to the technical field of photocatalyst preparation. The TiO2 composite material is a TiO2 composite material co-modified by MXene and quantum dots; the quantum dots are nitrogen-doped carbon quantum dots or carbon quantum dots; and the MXene is Ti3C2. According to the preparation method, Ti3C2 is taken as a titanium source, TiO2 grows on Ti3C2 in situ, and quantum dots are loaded, so that an NCQDs / TiO2@Ti3C2 composite material or a CQDs / TiO2@Ti3C2 composite material is prepared; according to the composite material, the separation efficiency of photo-generated carriers of TiO2 is remarkably improved, photo-generated electron-hole pairs migrate on a TiO2 / / Ti3C2 heterojunction interface, and the nano quantum dots serve as a photosensitizer to collect sunlight, so that the quantum efficiency of the composite material is improved, and the photocatalytic activity of the composite material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic composite materials, in particular to a TiO 2 Composite materials and methods for their preparation. Background technique [0002] MXene is a general term for graphene-like two-dimensional transition metal carbides (nitrides). At present, ternary ceramic material MAX phase is generally used as a precursor and prepared by liquid phase etching. Due to the rich variety of precursor MAX phases, more than 20 kinds of MXenes have been reported to be synthesized, including "21" type (Ti 2 CT x , Nb 2 CT x , V 2 CT x ), "32" type (such as Ti 3 C 2 T x , Zr 3 C 2 T x ) and "43" type (such as Ti 4 N 3 T x , Nb 4 C 3 T x ), etc., wherein T represents a surface adsorption group. [0003] Ti 3 C 2 T x It is a kind of titanium-based MXene, which has become the focus of attention in the international material chemistry community due to its excellent electrical conducti...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/22B01J35/00
CPCB01J27/24B01J27/22B01J35/39
Inventor 彭超周桃魏萍王梓容陈一鸣廖雯敏
Owner WUYI UNIV
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