Preparation method and application of modified material based on titanium dioxide

A technology of titanium dioxide and modified materials, applied in the field of materials, can solve the problems of limited light absorption range and slow charge transfer kinetics, and achieve the effects of broadening the light absorption range, improving efficiency and improving efficiency.

Pending Publication Date: 2020-07-14
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has the disadvantages of slow charge transfer kinetics and limited light absorption range

Method used

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  • Preparation method and application of modified material based on titanium dioxide
  • Preparation method and application of modified material based on titanium dioxide
  • Preparation method and application of modified material based on titanium dioxide

Examples

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preparation example Construction

[0025] The invention provides a preparation method based on titanium dioxide modified material, specifically comprising the following steps:

[0026] Step 1, dissolving a certain amount of boric acid and rhodium chloride trihydrate in a mixed solution of alcohol and water containing a certain amount of nitric acid, and mixing evenly to obtain liquid A. Wherein, the molar ratio of boric acid to rhodium chloride trihydrate is 50:1~5:1, the molar ratio of nitric acid, alcohol and water is 0.1:1:1~0.1:4:1, and the alcohol can be methanol or ethanol. In the embodiment of the present invention, ethanol is used, and in practical application, using methanol can achieve the same technical effect as ethanol.

[0027] Step 2, in a dry environment, under the condition of 0°C to 4°C, add isopropyl titanate dropwise into the ethanol solution to obtain liquid B. Wherein, the molar ratio of boric acid to isopropyl titanate is 5:1-20:1, and the reaction temperature is controlled at 0-4°C. I...

Embodiment 1

[0033] This example prepares a modified material based on titanium dioxide, the molar ratio of isopropyl titanate, boric acid and rhodium chloride trihydrate is selected as 500:50:1, and the specific operation is as follows:

[0034] Step 1: Dissolve boric acid and rhodium chloride trihydrate in a mixed solution of ethanol and water containing a certain amount of nitric acid (the molar ratio of nitric acid, ethanol and water is 0.1:1:1), and mix evenly to obtain liquid A.

[0035] Step 2, in a dry environment, under the condition of 0°C to 4°C, add isopropyl titanate dropwise into the ethanol solution to obtain liquid B. Control the reaction temperature to maintain it at 0-4°C. In this step, the isopropyl titanate is partially hydrolyzed, that is, the system is slightly turbid during the dropping process, but no obvious white precipitate appears, and the finally obtained liquid B is a translucent suspension.

[0036] Step 3, slowly drop the liquid A into the liquid B, continu...

Embodiment 2

[0040]This example prepares a modified material based on titanium dioxide, the molar ratio of isopropyl titanate, boric acid and rhodium chloride trihydrate is selected as 500:50:5, and the specific operation is as follows:

[0041] Step 1: Dissolve boric acid and rhodium chloride trihydrate in a mixed solution of ethanol and water containing a certain amount of nitric acid (the molar ratio of nitric acid, ethanol and water is 0.1:2:1), and mix evenly to obtain liquid A.

[0042] Step 2, in a dry environment, under the condition of 0°C to 4°C, add isopropyl titanate dropwise into the ethanol solution to obtain liquid B. Control the reaction temperature to maintain it at 0-4°C. In this step, the isopropyl titanate is partially hydrolyzed, that is, the system is slightly turbid during the dropping process, but no obvious white precipitate appears, and the finally obtained liquid B is a translucent suspension.

[0043] Step 3, slowly drop the liquid A into the liquid B, continuo...

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Abstract

The invention belongs to the technical field of materials, and provides a preparation method and application of a modified material based on titanium dioxide, which comprises the following steps: dissolving a certain amount of boric acid and rhodium chloride trihydrate in water containing nitric acid and alcohol to obtain a solution A; dropwise adding isopropyl titanate into the ethanol solution at the temperature of 0-4 DEG C to obtain a solution B; slowly dropwise adding the solution A into the solution B to obtain titanium dioxide sol; aging the titanium dioxide sol at room temperature, andperforming drying to obtain xerogel; and finally, grinding the dry gel into powder, and calcining the powder in air for 4 hours to obtain the boron-rhodium co-doped titanium dioxide, namely the titanium dioxide-based modified material. The material is used for photocatalytic hydrogen production, and the catalytic hydrogen production efficiency is effectively improved. The boron-rhodium co-doped titanium dioxide is prepared by adopting a one-pot sol-gel method, the absorption bandwidth of the titanium dioxide can be regulated and controlled by adjusting the rhodium doping proportion, and the light absorption and carrier separation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method and application of a titanium dioxide-based modified material. Background technique [0002] Over the past few decades, the global energy crisis has become more and more serious, and non-renewable fossil fuel energy has caused irreversible pollution to the environment. Therefore, the development of new clean energy has been put on the agenda. As a new type of clean energy, solar energy is becoming more and more important due to its low cost and renewable characteristics. Converting solar energy into clean chemical fuels has become a recent research hotspot. The hydrogen production performance of traditional photocatalytic water splitting is limited by the following three factors: 1) solar absorption band; 2) carrier separation efficiency and diffusion rate; 3) interfacial reaction and mass transfer rate. It is highly desirable to fundamentall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C01B3/04
CPCB01J23/464B01J35/004C01B3/042C01B2203/0277C01B2203/1064Y02E60/36
Inventor 时鹏辉严瑾许吉宏王鹏飞陆可人杨玲霞范金辰闵宇霖徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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