Process for producing N doping TiO2

A photocatalyst and acid catalysis technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as low utilization of solar energy and achieve good photocatalytic activity.

Inactive Publication Date: 2008-08-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 It has its own limitations: wide band gap (E g =3.0~3.2eV), its light absorption is only limited to the ultraviolet region, and the ultraviolet content in sunlight is less than 5%, so the utilization rate of solar energy is very low

Method used

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Experimental program
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Embodiment Construction

[0009] Implementation column 1

[0010] Pipette 0.25ml of HCl with a concentration of 37.5%, quickly add it to the tetrabutyl titanate and isopropanol solution mixed uniformly in a certain proportion under vigorous stirring, stir vigorously at a constant temperature at 25°C for 10min, and then add the deionized aqueous solution Slowly drop it into the above solution, and control the molar ratio of each component to be tetrabutyl titanate:isopropanol:deionized water=1:20:4. After standing for 5 minutes, a milky white translucent gel was formed. The obtained wet gel was airtightly aged for 5 days, and the aged wet gel was vacuum-dried at 65°C for 5 hours to obtain a loose yellow-brown xerogel powder, which was then baked in a muffle furnace for 2 hours. N-doped TiO 2 sample. When urea is not included in deionized water, that is, pure TiO 2 The photocatalytic activity under tungsten lamp is 1.

[0011] Implementation column 2

[0012] Pipette 0.3ml of HCl with a concentrati...

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Abstract

The invention discloses a preparation method of N-doped TiO2 photocatalyst, comprising a plurality of steps as followings: firstly, weighing 0.2 to 2 milliliter HCl solution with a concentration of 37.5%, quickly adding the HCl solution into a mixed solution of tetrabutyl titanate and isopropanol while strenuously agitating the HCl solution, then strenuously agitating for 10 to 20 minutes at a constant temperature of 25 DEG C, then slowly dropping a deionized water solution dissolved with 10% to 60% urea to obtain a yellow transparent sol, standing for 5 to 30 minutes to form a milkiness translucent gel; secondly, hermetically aging the prepared gel for 5 days, drying the wet aged gel for 5 hours at a vacuum condition and a temprature of 65 DEG C to obtain loose tawny dry xerogel powder, then putting the powder into a muffle furnace and calcining for 2 hours to obtain the N-doped TiO2 photocatalyst. The invention is characterized in that urea is used as a nitrogen source to prepare nitrogen-doped TiO2 photocatalyst with an acid catalysis sol-gel method. The N-doped TiO2 photocatalyst prepared by the method has the advantages of good photocatalysis activity when excited by a visible light.

Description

technical field [0001] The invention relates to an N-doped TiO 2 Preparation method of photocatalyst. Background technique [0002] Nano-TiO 2 It has good performance as a photocatalyst. In recent years, nano-TiO 2 The research on semiconductor photocatalytic degradation of pollutants in water has become a hot spot in the field of environmental science, and is considered to be one of the most promising and effective treatment methods. But TiO 2 It has its own limitations: wide band gap (E g =3.0~3.2eV), its light absorption is only limited to the ultraviolet region, and the ultraviolet content in sunlight is less than 5%, so the utilization rate of solar energy is very low. Study shows that non-metallic doping is the extension of TiO 2 The spectral response range of photocatalysts and effective means to improve their catalytic efficiency, N-doped modified TiO 2 , is currently non-metal element doped modified TiO 2 One of the most studied elements. Currently, for Ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/24
Inventor 刘国光蔡河山吕文英
Owner GUANGDONG UNIV OF TECH
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