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Method for preparing nitrogen doped titania visible light catalyzer

A technology of titanium dioxide and visible light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of catalyst particle aggregation, loss of specific surface area, and impact on visible light catalytic efficiency, and achieve heat treatment temperature reduction, The effect of improving doping efficiency and reducing requirements

Inactive Publication Date: 2005-01-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned preparation method, nitrogen is introduced into the titanium dioxide lattice, the breaking of Ti-O bonds and the formation of Ti-N bonds are carried out simultaneously, so the heat treatment temperature is not lower than 400 ° C, and such The heat treatment temperature will lead to the aggregation of catalyst particles and lose part of the specific surface area, thus affecting the visible light catalytic efficiency

Method used

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  • Method for preparing nitrogen doped titania visible light catalyzer
  • Method for preparing nitrogen doped titania visible light catalyzer
  • Method for preparing nitrogen doped titania visible light catalyzer

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Nitrogen-doped titania catalyst 1# was prepared by two-step synthesis of sol-gel method under ultraviolet light irradiation:

[0027] The ratio of raw materials (percentage by weight, total weight is 50 grams) of synthetic titanium sol:

[0028] Isopropyl titanate (analytical pure): 2%

[0029] Absolute ethanol (analytical pure): 95%

[0030] Concentrated hydrochloric acid (36.5%): 2%

[0031] Ammonium chloride (analytical pure): 1%

[0032] Light intensity: 20mV / cm 2

[0033] Lighting time: 15 hours

[0034] Put isopropyl titanate, absolute ethanol, and concentrated hydrochloric acid in the reaction bottle according to the above ratio, stir at a temperature of 15°C and react for 15 hours under the irradiation of a 500W high-pressure mercury lamp; then add aqueous ammonium chloride solution to the reaction solution , continue to react for 2 hours to obtain titanium sol. The solvent was evaporated to obtain a gel, and the gel was dried in an air atmosphere at 100°...

Embodiment 2

[0048] Preparation of nitrogen-doped titania catalyst 3# by sol-gel method under ultraviolet radiation:

[0049] The ratio of raw materials (percentage by weight, total weight is 50 grams) of synthetic titanium sol:

[0050] Isopropyl titanate (analytical pure): 2%

[0051] Absolute ethanol (analytical pure): 93%

[0052] Concentrated hydrochloric acid (36.5%): 1%

[0053] Ammonium chloride (analytical pure): 4%

[0054] Light intensity: 5mV / cm 2

[0055] Lighting time: 20 hours

[0056] Put isopropyl titanate, absolute ethanol, and concentrated hydrochloric acid in the reaction bottle according to the above ratio, and react at 25°C for 20 hours under the irradiation of a 300W medium-pressure mercury lamp; then add aqueous ammonium chloride solution to the reaction solution, The reaction was continued for 3 hours to obtain titanium sol. The solvent was evaporated to obtain a gel, and the gel was dried in an air atmosphere at 80° C. for 2 hours to obtain the target produ...

Embodiment 3

[0060] Research on visible light catalytic activity of nitrogen-doped titanium dioxide samples 1# and 3#:

[0061] A certain amount of 1#, 3# powder samples are placed in the acid pink aqueous solution of organic dye molecules, under the irradiation of 450nm visible monochromatic light, the acid pink aqueous solution gradually fades, and the organic dye molecules are degraded, see Figure 5 ; Similarly, in the degradation of other organic dye molecules with visible light, such as rhodamine B, eosin, phycoerythrin, eosin, etc., 1#, 3# samples all showed significant visible light catalytic activity, see Image 6 .

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Abstract

The invention discloses a method for preparing a nitrogen doped titanium dioxide visible light catalyst. The process includes the following steps (by weight) : (1) 1% to 15% titanate, 0.5% to 10% hydrolyst and 75% to 95% diluent agent are placed in reactor and react for 5 to 40 hours by irradiation of ultraviolet lamp at 15 to 30 degrees C.; 0.1 to 5% ammonium salt solution is added into reactor to give sol after reacting for 1 to 5 hours; solvent is volatilized and dried for 1 to 3 hours at 50 to 200 degrees C. after titanium sol is obtained. The catalyst has excellent visible light catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped titanium dioxide visible light catalyst. Background technique [0002] Today, with the increasing prosperity of the global economy and the rapid development of industrialization, the problem of environmental pollution has become a focus that directly threatens the survival of human beings and needs to be solved urgently. and harmful chemicals in water, but these methods require large investment and short timeliness. Semiconductor photocatalysis is used in environmental pollution control because it has high photochemical conversion efficiency, high stability and deep oxidation of various organic pollutants. High inclusiveness, especially its unique advantage of directly using solar energy for photochemical conversion, has been highly valued by scientists from the very beginning. At present, semiconductor photocatalysts have been successfully applied to eliminate various pollutants, such ...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/24
Inventor 姚建年刘海梅
Owner INST OF CHEM CHINESE ACAD OF SCI
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