3D morphology CeO2/TiO2 catalyst preparation method

A catalyst and morphology technology, applied in the field of cerium oxide and titanium dioxide heterojunction photocatalysts, can solve the problems of low utilization rate of sunlight and achieve the effects of wide adjustable range of parameters, strong repeatability, and simple process and process

Inactive Publication Date: 2018-01-19
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide also has two major problems as a photocatalyst: First, the large band gap results in extremely low utilization of sunlight by titanium di...

Method used

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  • 3D morphology CeO2/TiO2 catalyst preparation method
  • 3D morphology CeO2/TiO2 catalyst preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A 3D shape of CeO 2 / TiO 2 Catalyst preparation method, comprises the steps:

[0028] (1) Add urea, cetyltrimethylammonium bromide (CTAB), and cerium nitrate to ethylene glycol, stir to dissolve, add tetrabutyl titanate, and stir to form a homogeneous solution. Then add deionized water dropwise while stirring in the above system until a transparent gel is formed;

[0029] (2) Put the above gel into a polytetrafluoroethylene-lined stainless steel autoclave, and conduct a hydrothermal reaction at 150°C for 24 hours. After the reaction, wash the precipitated product with deionized water until the pH of the washing solution is neutral, and then Dry at 80° C. for more than 10 hours to obtain the target cerium oxide / titanium dioxide composite nanomaterial.

[0030] (3) The above-mentioned dried sample was calcined at 400 °C for 2 h to remove residual organic matter to obtain 3D CeO 2 / TiO 2 composite nanomaterials.

[0031] Wherein, the molar ratio of titanate and CTAB ...

Embodiment 2

[0034] A 3D shape of CeO 2 / TiO 2 Catalyst preparation method, comprises the steps:

[0035] (1) Add urea, cetyltrimethylammonium bromide (CTAB), and cerium nitrate to ethylene glycol, stir to dissolve, add liquid phase titanium source (isopropyl titanate), and stir to form a homogeneous solution. Then, deionized water was added dropwise to the above system while stirring until a transparent gel was formed.

[0036](2) Put the above gel into a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 200 °C for 8 h. After the reaction, the precipitated product was washed with deionized water until the pH of the washing solution was neutral, and then dried at 80° C. for more than 10 h. Drying treatment is carried out to obtain the target cerium oxide / titania composite nanomaterial.

[0037] (3) The above-mentioned dried sample was calcined at 400 °C for 2 h to remove residual organic matter to obtain 3D CeO 2 / TiO 2 composite nanomaterials, see ...

Embodiment 3

[0041] A 3D shape of CeO 2 / TiO 2 Catalyst preparation method, comprises the steps:

[0042] (1) Add urea, cetyltrimethylammonium bromide (CTAB), and cerium nitrate to ethylene glycol, stir to dissolve, add liquid phase titanium source (tetraethyl titanate), and stir to form a homogeneous solution. Then, deionized water was added dropwise to the above system while stirring until a transparent gel was formed.

[0043] (2) Put the above gel into a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 180 °C for 12 h. After the reaction, the precipitated product was washed with deionized water until the pH of the washing solution was neutral, and then dried at 80° C. for more than 10 h. Drying treatment is carried out to obtain the target cerium oxide / titania composite nanomaterial.

[0044] (3) The above-mentioned dried sample was calcined at 400 °C for 2 h to remove residual organic matter to obtain 3D CeO 2 / TiO 2 composite nanomaterials. ...

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Abstract

The present invention relates to a 3D morphology CeO2/TiO2 catalyst preparation method, which comprises: adding urea, CTAB and cerium nitrate to ethylene glycol, dissolving, adding a liquid phase titanium source to the obtained solution to form a homogeneous solution, adding deionized water in a dropwise manner, and stirring to form a transparent gel; carrying out hydrothermal treatment on the transparent gel, washing, filtering, and drying; and roasting to obtain the 3D morphology CeO2/TiO2 catalyst. The invention further relates to the product obtained by the method and applications thereof. According to the present invention, the pH value of the reaction system is self-regulated by slowly decomposing urea during the hydrothermal process, such that the doping of the rare earth element cerium oxide in the titanium dioxide is achieved; and the preparation method has advantages of simple process, convenient procedure, wide parameter adjustment range, strong repeatability and low cost,and the prepared titanium dioxide photocatalyst has strong response under visible light conditions.

Description

technical field [0001] The invention relates to a heterojunction photocatalyst of cerium oxide and titanium dioxide, in particular to a 3D morphology CeO 2 / TiO 2 Catalyst method. To broaden the visible light response range of titanium dioxide photocatalysts. Background technique [0002] Titanium dioxide stands out among many semiconductor oxides due to its stable chemical properties, high thermal stability, high catalytic activity, light corrosion resistance, non-toxicity, and easy availability of raw materials. It is widely used in the degradation of atmospheric and water environmental pollutants, antibacterial, Fields such as deodorization and self-cleaning. However, there are two major problems with titanium dioxide as a photocatalyst: First, the large forbidden band width leads to extremely low utilization rate of sunlight by titanium dioxide. At room temperature and pH=1, the band gap of anatase titanium dioxide is about 3.2eV. According to Einstein's equation, it...

Claims

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Application Information

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IPC IPC(8): B01J23/10
Inventor 何丹农林琳徐少洪王艳丽金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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