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Method for preparing carbon-nitrogen-chlorine co-doped nano titanium dioxide photocatalysts

A nano-titanium dioxide and photocatalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high preparation cost, high equipment requirements, complex process, etc. The effect of low equipment requirements and simple operation

Inactive Publication Date: 2012-12-12
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when the titanium dioxide photocatalyst is prepared by the multi-element non-metal element doping process, it often needs to be carried out under high pressure, which requires extremely high equipment (such as CN101757936A, CN1562461A, CN101332436A), or the process is complicated and difficult to control (such as CN1775359A), or A higher temperature post-calcination treatment process (such as CN1562461A) is required, so the preparation cost is higher

Method used

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  • Method for preparing carbon-nitrogen-chlorine co-doped nano titanium dioxide photocatalysts
  • Method for preparing carbon-nitrogen-chlorine co-doped nano titanium dioxide photocatalysts
  • Method for preparing carbon-nitrogen-chlorine co-doped nano titanium dioxide photocatalysts

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Embodiment 1

[0023] Embodiment 1 Preparation of carbon-nitrogen-chlorine co-doped nano-titanium dioxide photocatalyst

[0024] Step 1: adding titanium tetrachloride to ice water to form a transparent titanium tetrachloride solution, wherein the volume ratio of titanium tetrachloride and water is 1:20.

[0025] Step 2: After adding ammonia water in step 1, a white precipitate is produced. The molar ratio of the amount of ammonia added to titanium tetrachloride is 4:1.

[0026] Step 3: Filter the white precipitate obtained in step 2, wash with deionized water for 3 to 5 times, and bake at 80°C for 12 hours to obtain amorphous TiO 2 Powder.

[0027] Step 4: Mix the powder obtained in step 3 with glucose in a mass ratio of 1:0.25, then calcinate at 250°C for 3 hours, cool and grind to obtain carbon-nitrogen-chlorine co-doped nano-titanium dioxide with a particle size of less than 20nm Powder.

Embodiment 2

[0028] Embodiment 2 Preparation of carbon-nitrogen-chlorine co-doped nano-titanium dioxide photocatalyst

[0029] Step 1: adding titanium tetrachloride to ice water to form a transparent titanium tetrachloride solution, wherein the volume ratio of titanium tetrachloride and water is 1:20.

[0030] Step 2: After adding ammonia water in step 1, a white precipitate is produced. The molar ratio of the amount of ammonia added to titanium tetrachloride is 4:1.

[0031] Step 3: Filter the white precipitate obtained in step 2, wash with deionized water for 3 to 5 times, and bake at 80°C for 12 hours to obtain amorphous TiO 2 Powder.

[0032] Step 4: Mix the powder obtained in step 3 with glucose evenly at a mass ratio of 1:0.25, then calcinate at 300°C for 3 hours, cool and grind to obtain carbon-nitrogen-chlorine co-doped nano-titanium dioxide with a particle size of less than 20nm Powder.

[0033] The carbon-nitrogen-chlorine co-doped nano-titanium dioxide powder prepared in Examp...

Embodiment 3

[0034] The preparation of the nano titanium dioxide photocatalyst of embodiment 3 carbon-nitrogen-chlorine co-doping

[0035] Step 1: adding titanium tetrachloride to ice water to form a transparent titanium tetrachloride solution, wherein the volume ratio of titanium tetrachloride and water is 1:20.

[0036] Step 2: After adding ammonia water in step 1, a white precipitate is produced. The molar ratio of the amount of ammonia added to titanium tetrachloride is 4:1.

[0037] Step 3: Filter the white precipitate obtained in step 2, wash with deionized water for 3 to 5 times, and bake at 80°C for 12 hours to obtain amorphous TiO 2 Powder.

[0038] Step 4: Mix the powder obtained in step 3 with ammonium chloride and glucose in a mass ratio of 1:0.1:0.25, then calcinate at 300°C for 3 hours, cool and grind to obtain carbon-nitrogen-chlorine with a particle size of less than 20nm Co-doped nano titanium dioxide powder.

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Abstract

The invention relates to a method for preparing carbon-nitrogen-chlorine co-doped nano titanium dioxide visible light photocatalysts. Titanium tetrachloride, ammonia compounds and carbohydrates are used as reactants in the method; the photocatalysts are prepared by hydrolysis, deposition and roasting; and the carbon-nitrogen-chlorine co-doped titanium dioxide nano photocatalysts with different doping amounts are obtained by hydrolysis, filtration, washing, drying and roasting. The specific surface area of the carbon-nitrogen-chlorine co-doped nano titanium dioxide visible light photocatalystssynthesized by the preparation method reaches 235m<2> / g, the size of the grains is about 5 nanometers, and the photocatalysts have very high photocatalysis activity under the irradiation of visible light; and the synthetic route is simple, the raw materials are easily obtained, the cost is low, and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a visible light photocatalyst carbon-nitrogen-chlorine co-doped nano titanium dioxide photocatalyst, belonging to the field of nano photocatalytic materials. Background technique [0002] Photocatalytic oxidation technology is an advanced pollutant removal technology. Titanium dioxide is widely used in air purification, degradation of water pollutants, antibacterial, deodorization and self-cleaning due to its stable properties, non-toxicity, low cost, and high activity in ultraviolet light. However, due to the wide band gap of titanium dioxide (Eg=3.2eV), only ultraviolet light with a wavelength of less than 387nm can be used, and in the solar spectrum, this part of ultraviolet light only accounts for 3 to 5% of the total energy, so the utilization of solar energy low efficiency. Visible light accounts for 43% of the total energy in sunlight, so how to expand the absorption of visible light by titanium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/02
Inventor 聂龙辉甘玉梅徐洪涛
Owner HUBEI UNIV OF TECH
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