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Preparaton method of photo catalytic active nitrogen adulterated titanium dioxide nano material

A photocatalytic activity, titanium dioxide technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Simple preparation method

Inactive Publication Date: 2004-12-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the magnetron sputtering process and expensive equipment, the cost of preparing nitrogen-containing titanium dioxide photocatalytic films with it is very high and cannot be used on a large scale.

Method used

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  • Preparaton method of photo catalytic active nitrogen adulterated titanium dioxide nano material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 20ml of nitrogen solution (0.5M / L) was reacted with 20ml of tetrabutyl titanate (mass percentage>98.0%) until white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 4 hours, evaporated to remove water and part of the alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 400° C. for 1 hour to obtain a nitrogen-doped titanium dioxide nano-catalyst material with high catalytic activity under visible light. In the catalyst material activity test, the first order reaction kinetics apparent rate constant k=3.86×10 of this catalyst catalyzes the degradation of phenol -3 min -1 , is titanium dioxide powder (P25, Degussa) first-order reaction kinetics apparent rate constant k=1.04×10 -3 min -1 3.7 times, this is due to the nitrogen doping technology ...

Embodiment 2

[0029] Precipitate 20ml of ammonia solution (0.5M / L) and 20ml of titanium sulfate (mass percentage>40.0%) until white precipitate is completely formed. Rinse the resulting white precipitate with deionized water until the anion (sulfate ion) concentration is less than 0.5 mg / L. It was then filtered to collect the precipitated material washed with deionized water. The white precipitate was directly heated in an oven, treated at 120°C for 4 hours, evaporated to remove water and part of the alcohols produced in the reaction to obtain a solid dry product. Then grind the dry solid to make the particles uniform and reduce soft agglomeration. Then it is placed in a muffle furnace and calcined at 400° C. for 1 hour to obtain a nitrogen-doped titanium dioxide nano-catalyst material with high catalytic activity under visible light. In the catalytic activity test, the first-order reaction kinetics apparent rate constant k=3.41×10 of the catalyst material catalyzes the degradation of phe...

Embodiment 3

[0031] 20ml of ammonia water (0.5M / L) and 20ml of tetrabutyl titanate (mass percentage>98.0%) were subjected to a precipitation reaction until a white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 4 hours, evaporated to remove water and part of the alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 400° C. for 1 hour, 1.5 hours, and 2 hours respectively to obtain a nitrogen-doped titanium dioxide nano-catalyst material with high catalytic activity under visible light. In the catalytic activity test, the apparent rate constants of the first-order reaction kinetics of the catalyst material to catalyze the degradation of phenol are k=3.86.×10 -3 min -1 , 3.81×10 -3 min -1 , 3.76×10 -3 min -1 . It can be seen that after heat treatment for 1 ho...

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Abstract

A nitrogen doped nano-class TiO2material with photocatalytic activity is prepared by doping N into TiO2 crystal. It features that its energy gap can be triggered by visual light, realizing the full-frequency absorption to visual light for increasing its light quantum efficiency.

Description

technical field [0001] The invention relates to a preparation method of a nanometer material, in particular to a preparation method of a photocatalytically active nitrogen-doped titanium dioxide nanometer material, which belongs to the field of inorganic nanometer photocatalytic materials. Background technique [0002] Titanium dioxide (TiO 2 ) Semiconductor photocatalytic oxidation technology is a new type of modern technology; because it can widely use natural energy - solar energy, and has the outstanding characteristics of low energy consumption, mild reaction conditions, easy operation, and can reduce secondary pollution, it is increasingly popular It has broad application prospects. In recent years, semiconductor photocatalysis has become one of the research hotspots in the field of photochemistry and environmental protection, and its application in wastewater treatment has been reported in many literatures. A large number of studies have confirmed that dyes, surfact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/03
Inventor 蔡伟民王正鹏徐俊
Owner SHANGHAI JIAO TONG UNIV
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