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Preparation method for nitrogen-doped anatase titanium dioxide

An anatase type, titanium dioxide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of complex experimental process, low doping efficiency, cumbersome operation, etc., and achieve slowdown rate , increase the content of nitrogen, prevent the effect of recombination

Inactive Publication Date: 2016-04-20
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus experimentally there exists NH 3 Disadvantages such as toxicity, low doping efficiency, complicated experimental process, cumbersome operation, etc.

Method used

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  • Preparation method for nitrogen-doped anatase titanium dioxide
  • Preparation method for nitrogen-doped anatase titanium dioxide
  • Preparation method for nitrogen-doped anatase titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1). Weigh 7 parts of titanium nitride with an average particle diameter of 20nm, place them in a muffle furnace, and calcinate at a constant temperature of 380°C for 30 minutes, and then lower to room temperature to obtain sample 1 and test sample 1. by figure 1 It is known that the anatase-type titanium dioxide peak held at a temperature of 380°C for 30 minutes and retains part of titanium nitride, which still has a high absorption of visible light.

[0037] (2). Place the above sample 1 in a muffle furnace, calcinate at a constant temperature of 350°C for 1 hour, then cool to room temperature, take the sample out of the muffle furnace, and obtain sample 2, which is a nitrogen-doped anatase type Titanium dioxide material, made of image 3 It is known that the test sample 2 has not formed a 400nm visible light absorption platform after the second oxidation and calcination for 1 hour. by Figure 4 It is known that sample 2 still contains titanium nitride after being kept a...

Embodiment 2

[0039] (1). Weigh 8 parts of titanium nitride with an average particle diameter of 50nm, place them in a muffle furnace, and calcinate at a constant temperature of 420°C for 30 minutes, and then lower to room temperature to obtain sample 1 and test sample 1.

[0040] (2). Put the above sample 1 in a muffle furnace, calcined at a constant temperature of 350℃ for 2h, then lower to room temperature, take the sample out of the muffle furnace, and obtain sample 3, which is a nitrogen-doped anatase type Titanium dioxide material, made of image 3 It is known that the test sample 3 has not formed a 500nm visible light absorption platform after the second oxidation and calcination for 2 hours. by Figure 4 It is known that sample 3 has almost no titanium nitride after being kept at a temperature of 350°C for 2 hours.

Embodiment 3

[0042] (1). Weigh 8.5 parts of titanium nitride with an average particle size of 40nm, place it in a muffle furnace, reduce to room temperature, and calcine at a constant temperature of 395°C for 30 minutes to obtain sample 1 and test sample 1.

[0043] (2). Place the above sample 1 in a muffle furnace and calcinate at a constant temperature of 350°C for 4 hours. Take the sample out of the muffle furnace and cool to room temperature to obtain sample 4, which is nitrogen-doped anatase titanium dioxide. Material by image 3 It is known that the test sample 4 has formed a 450nm visible light absorption platform after the second oxidation and calcination for 4 hours. by Figure 4 It is known that there is no titanium nitride peak in sample 4 after a constant temperature of 350°C for 4 hours.

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Abstract

The invention discloses a preparation method for nitrogen-doped anatase titanium dioxide. The preparation method is characterized by comprising the following steps that 7-10 parts of titanium nitride with the average particle size of 20-50 nm is placed into a muffle furnace, constant-temperature calcination is performed for 15-90 min at the temperature of 395 DEG C-405 DEG C, the temperature is decreased to the room temperature, and a first sample is obtained; the first sample is placed in the muffle furnace, constant-temperature calcinations is performed for 1-8 h at the temperature of 345 DEG C-355 DEG C, then the temperature is decreased to the room temperature, and a second sample, that is, the nitrogen-doped anatase titanium dioxide is obtained, and the second sample forms a 400-500-nm visible light absorption platform through second-time oxidizing calcination. The nitrogen-doped anatase titanium dioxide is applied to the fields of organic pollutant degradation, dye degradation, water photodecomposition and hydrogen production environment restoration.

Description

Technical field [0001] The invention relates to a preparation method of nitrogen-doped anatase titanium dioxide, which belongs to the field of preparation of titanium dioxide photocatalytic materials. Background technique [0002] Photocatalytic materials are very important for environmental remediation and have been used in many fields, such as purifying air and water, deodorizing, decomposing water and converting solar energy into electricity. Until now, there have been many kinds of photocatalysts, among which titanium dioxide can effectively remove a variety of toxic organic compounds and harmful materials due to its strong oxidizing power of photo-generated holes, and is considered to be the most promising photocatalytic material. Titanium dioxide has a wide band gap and absorption in the ultraviolet region (anatase electromagnetic band gap = 3.2 eV). However, only about 4% of solar photons are in the ultraviolet range, which limits their practical use. Improving visible l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 郭欣谭华侨蹇源周志军孙再成李梅石洪飞郭继军
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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