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2D porous TiO2 nanosheet rich in surface defects and preparation method of 2D porous TiO2 nanosheet

A nanosheet and defect technology, which is applied in the field of 2D porous TiO2 nanosheets with rich surface oxygen vacancies and their preparation, can solve the problems of low photocatalytic efficiency and the like, and achieve the effects of increasing defect concentration, improving performance and low cost

Pending Publication Date: 2020-09-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at TiO 2 low photocatalytic efficiency, providing a simple solution for 2D porous TiO rich in surface defects 2 Preparation method of nanosheet material

Method used

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  • 2D porous TiO2 nanosheet rich in surface defects and preparation method of 2D porous TiO2 nanosheet
  • 2D porous TiO2 nanosheet rich in surface defects and preparation method of 2D porous TiO2 nanosheet
  • 2D porous TiO2 nanosheet rich in surface defects and preparation method of 2D porous TiO2 nanosheet

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Experimental program
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Embodiment 1

[0031] (1) Prepare graphene oxide GO powder for subsequent use:

[0032] Add 1.5g of graphite powder into a 500mL beaker, then add 180mL of 98% H 2 SO 4 and 20 mL of 85% H 3 PO 4 Mix and slowly drop into the above beaker with gentle stirring. The solution was transferred to an oil bath and heated at 50°C. Subsequently, 9g KMnO 4 Disperse in the mixed solution in batches and keep the reaction system at 50±1°C. After stirring vigorously for 12 h under sealed conditions, slowly inject 30% H from the bottom of the beaker 2 o 2 And keep the reaction solution at 50±1°C. The solution was observed to change in color from black to purple to bright yellow until no more bubbles were produced. The obtained sample was rinsed with distilled water and centrifuged until the pH value was 5-6, and the obtained solid was freeze-dried and stored in a dry box. .

[0033] (2) Preparation of GO@Ti(OH) 4 Composite, spare:

[0034] 90 mg of GO was dispersed in 180 mL of absolute ethanol a...

Embodiment 2

[0040] Step (1) and step (2) and step (3) of the present embodiment are identical with embodiment 1;

[0041] (4) Preparation of 2D porous TiO rich in surface defects 2 Nanosheet material:

[0042] The 2D porous TiO prepared in step (3) 2 The nanosheets were calcined at 500 °C under a reducing atmosphere (90 vol.% argon and 10 vol.% hydrogen) for 4 h to obtain 2D porous TiO rich in surface defects 2 Nanosheets. The heating rate is 2°C / min

Embodiment 3

[0044] Step (1) and step (2) and step (3) of the present embodiment are identical with embodiment 1;

[0045] (4) Preparation of 2D porous TiO rich in surface defects 2 Nanosheet material:

[0046] The 2D porous TiO prepared in step (3) 2 The nanosheets were calcined at 500 °C under a reducing atmosphere (90 vol.% argon and 10 vol.% hydrogen) for 6 h to obtain 2D porous TiO rich in surface defects 2 Nanosheets. The heating rate is 2°C / min

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Abstract

The invention belongs to the field of nano materials, the invention discloses a preparation method of a 2D porous TiO2 nanosheet photocatalyst rich in surface defects. The preparation method comprisesthe following steps: preparing graphene oxide by a Hummers method, preparing GO@Ti (OH) 4 by an oil bath method, preparing a 2D porous TiO2 nanosheet by calcining, and further preparing the 2D porousTiO2 nanosheet rich in surface defects by hydrogen reduction. Through cooperation of the 2D porous TiO2 nanosheet and defect engineering, active sites and edge sites of the nano photocatalyst are fully exposed, the recombination rate of photo-induced electron holes is reduced, the sunlight utilization rate is increased, and then the photocatalytic performance of the nano photocatalyst is improved. The material can be used for photocatalytic decomposition of water to produce hydrogen, which is of great significance to the development of clean energy.

Description

technical field [0001] The invention belongs to the field of nanomaterials and relates to a 2D porous TiO rich in surface defects 2 The preparation method of nanosheets, specifically a 2D porous TiO2 surface rich in oxygen vacancies prepared by using graphene as a sacrificial template 2 Nanosheet and its preparation method and use. Background technique [0002] Titanium dioxide (Titanium dioxide, TiO 2 ), as one of the most widely studied semiconductor materials, has attracted widespread attention due to its low price, stable performance, abundant reserves, and non-toxic properties. However, in practical applications, due to the large bandgap (3.0-3.2eV), there are fewer exposed active sites, resulting in a severely low solar energy utilization rate, resulting in low photocatalytic performance. [0003] In recent years, titania prepared by hydrogen reduction at high temperature has been considered as an effective way to enhance photocatalytic performance due to its narrow...

Claims

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Application Information

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IPC IPC(8): C01G23/047B01J35/10B01J35/00B01J21/06
CPCC01G23/047B01J21/063C01P2004/20C01P2002/72C01P2004/03C01P2004/04B01J35/60B01J35/39
Inventor 姜德立张乾晓李娣
Owner JIANGSU UNIV
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