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Preparation method of carbon-nitrogen co-doped nano-titanium dioxide

A nano-titanium dioxide, titanium dioxide technology, applied in the field of titanium dioxide, can solve the problems of unfavorable large-scale production, lengthy process, complicated method, etc., and achieve the effect of being suitable for large-scale production, simple process and low environmental pollution

Inactive Publication Date: 2016-07-13
SHENZHEN XIANGFENGHUA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current method of preparing carbon-nitrogen co-doped titanium dioxide, the process is lengthy and complicated, the yield is low, and the cost is high, which is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of carbon-nitrogen co-doped nano-titanium dioxide, comprising the steps of:

[0021] 1) Mix titanium dioxide, carbon nitrogen source and solvent according to a certain mass ratio of 1:0.01:50, and obtain mixture A after ultrasonication for 0.5h; the carbon nitrogen source is polypyrrole, the titanium dioxide crystal form is anatase, and the particle size is D50 =5nm, 100% purity.

[0022] 2) Microwave heating:

[0023] Move mixture A to a high-pressure reactor with a pressure of 5mPa, then place the reactor in a microwave oven with a power of 1000w, and heat for 30s to obtain mixture B;

[0024] 3) Filter and dry:

[0025] The mixture B was filtered through a 0.2um PTFE membrane filter, and the resulting filter cake was dried at 80° C. for 10 minutes to obtain carbon-nitrogen co-doped nano-titanium dioxide.

Embodiment 2

[0027] A preparation method of carbon-nitrogen co-doped nano-titanium dioxide, comprising the steps of:

[0028] 1) Mix titanium dioxide, carbon nitrogen source and solvent according to a certain mass ratio of 1:0.5:100, and obtain mixture A after ultrasonication for 2 hours; the carbon nitrogen source is ethylenediamine, the titanium dioxide crystal form is anatase, and the particle size is D50 =50 nm, purity 100%.

[0029] 2) Microwave heating:

[0030] Move mixture A to a high-pressure reactor with a pressure of 30mPa, then place the reactor in a microwave oven with a power of 200w, and heat for 150s to obtain mixture B;

[0031] 3) Filter and dry:

[0032] The mixture B was filtered through a 0.2um PTFE membrane filter, and the obtained filter cake was dried at 150° C. for 10 minutes to obtain carbon-nitrogen co-doped nano-titanium dioxide.

Embodiment 3

[0034] A preparation method of carbon-nitrogen co-doped nano-titanium dioxide, comprising the steps of:

[0035] 1) Mix titanium dioxide, carbon and nitrogen sources and solvents at a certain mass ratio of 1:0.1:60, and obtain mixture A after ultrasonication for 1 hour; the carbon and nitrogen sources include polyaniline:polydopamine:pyridine=1:1 by mass ratio :1 mixed, the titanium dioxide crystal form is anatase, the particle size D50=20nm, and the purity is 100%.

[0036] 2) Microwave heating:

[0037] Move mixture A to a high-pressure reactor with a pressure of 20mPa, then place the reactor in a microwave oven with a power of 600w, and heat for 50s to obtain mixture B;

[0038] 3) Filter and dry:

[0039] The mixture B was filtered through a 0.2um PTFE membrane filter, and the obtained filter cake was dried at 100° C. for 20 minutes to obtain carbon-nitrogen co-doped nano-titanium dioxide.

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Abstract

The invention discloses a preparation method of carbon-nitrogen co-doped nano-titanium dioxide. The method comprises the steps of: 1) ultrasonic treatment: mixing titanium dioxide, a carbon-nitrogen source and a solvent in a mass ratio of 1:0.01-0.5:50-100, and performing ultrasonic treatment for 0.5-2h to obtain a mixture A; 2) microwave heating: transferring the mixture A into a high pressure reaction kettle with a pressure of 5-30mPa, then placing the high pressure reaction kettle in a microwave oven with power of 200-1000W, and conducting heating for 30-150s to obtain a mixture B; 3) filtering and drying: filtering the mixture B in a filter equipped with a 0.2micrometer PTFE membrane, and drying the obtained filter cake at 80-150DEG C for 10-30min so as to obtain the carbon-nitrogen co-doped nano-titanium dioxide. The carbon-nitrogen co-doped nano-titanium dioxide prepared by the method provided by the invention shows high photocatalytic degradation activity to organic pollutants under visible light irradiation, and the degradation rate is more than 90%.

Description

technical field [0001] The invention relates to the technology in the field of titanium dioxide, and in particular provides a method for preparing carbon-nitrogen co-doped nanometer titanium dioxide. Background technique [0002] TiO 2 Because of its stable chemical properties, non-toxicity and ability to effectively remove pollutants in the atmosphere and water, it has become an ideal material for solving energy and environmental problems, and has aroused extensive interest of researchers from various countries. TiO 2 It has a wide range of uses and can photocatalytically degrade a variety of organic pollutants into non-toxic small molecular compounds, such as water, CO 2 , inorganic acids, etc., to remove heavy metal ions in the solution, and restore them to non-toxic metals, and photolyze water into H 2 and O 2: To obtain hydrogen energy, it is applied to solar cells to effectively convert solar energy into chemical energy. But TiO 2 It is a semiconductor compound w...

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 宋宏芳赵东辉戴涛周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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