Preparation method of nitrogen-doped silicon-aluminum immobilized TiO2 porous ceramic

A technology of porous ceramics and nitrogen doping, applied in the field of photocatalytic materials, can solve the problems of high energy consumption, high cost, complex gas phase method equipment, etc., and achieve the effect of increasing porous structure, effective doping, and increasing photocatalytic activity

Inactive Publication Date: 2013-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complex equipment required by the gas phase method, high energy consumption and high cost, the liquid phase method is widely used in laboratories at present.

Method used

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  • Preparation method of nitrogen-doped silicon-aluminum immobilized TiO2 porous ceramic
  • Preparation method of nitrogen-doped silicon-aluminum immobilized TiO2 porous ceramic
  • Preparation method of nitrogen-doped silicon-aluminum immobilized TiO2 porous ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh a certain amount of Na according to the molar ratio of Si / Ti / Al / CTAB of 1:2:0.1:0.25 2 SiO 3 , Ti(SO 4 ) 2 、Al 2 (SO 4 ) 3 and CTAB reagent, ground into fine powder and prepared saturated solution with deionized water respectively;

[0033] (2) The prepared Ti 2 (SO 4 ) 2 and Al 2 (SO 4 ) 3 The solutions were mixed to form solution A; then the mixed solution A was added dropwise to Na 2 SiO 3 A colloidal solution B is formed in the solution; after stirring for ten minutes, the template solution is added to the B solution, and the stirring is continued to form a white milky suspension C;

[0034] (3) Add a certain amount of urea solution with a concentration of 5mol / L to liquid C according to the ratio of N / Ti molar ratio of 4, adjust the pH value to 4 with NaOH solution while stirring, and continue stirring for half an hour to form a suspension D ;

[0035] (4) Transfer the prepared suspension D into a hydrothermal kettle for hydrothermal reacti...

Embodiment 2

[0040] (1) Weigh a certain amount of Na according to the molar ratio of Si / Ti / Al / CTAB of 1:2:0.1:0.25 2 SiO 3 , Ti(SO 4 ) 2 、Al 2 (SO 4 ) 3 and CTAB reagent, ground into fine powder and prepared saturated solution with deionized water respectively;

[0041] (2) The prepared Ti 2 (SO 4 ) 2 and Al 2 (SO 4 ) 3 The solutions were mixed to form solution A; then the mixed solution A was added dropwise to Na 2 SiO 3 A colloidal solution B is formed in the solution; after stirring for ten minutes, the template solution is added to the B solution, and the stirring is continued to form a white milky suspension C;

[0042] (3) Add a certain amount of urea solution with a concentration of 5 mol / L to liquid C according to the ratio of N / Ti molar ratio of 6, and adjust the pH value to 4.5 with NaOH solution while stirring, and continue stirring for half an hour to form suspension D;

[0043] (4) Transfer the prepared suspension D into a hydrothermal kettle for hydrothermal rea...

Embodiment 3

[0048] (1) Weigh a certain amount of Na according to the molar ratio of Si / Ti / Al / CTAB of 1:2:0.1:0.25 2 SiO 3 , Ti(SO 4 ) 2 、Al 2 (SO 4 ) 3 and CTAB reagent, ground into fine powder and prepared saturated solution with deionized water respectively;

[0049] (2) The prepared Ti 2 (SO 4 ) 2 and Al 2 (SO 4 ) 3 The solutions were mixed to form solution A; then the mixed solution A was added dropwise to Na 2 SiO 3 A colloidal solution B is formed in the solution; after stirring for ten minutes, the template solution is added to the B solution, and the stirring is continued to form a white milky suspension C;

[0050] (3) Add a certain amount of urea solution with a concentration of 5 mol / L to the suspension C according to the ratio of N / Ti molar ratio of 2, adjust the pH value to 3.5 with NaOH solution while stirring, and continue stirring for half an hour to form a suspension D ;

[0051] (4) Transfer the prepared suspension D into a hydrothermal kettle for hydrothe...

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Abstract

The invention provides a preparation method of nitrogen-doped silicon-aluminum immobilized TiO2 porous ceramic. The preparation method comprises the steps of: carrying out reaction with water-soluble inorganic silicon salt as a silicon source, water-soluble inorganic titanium salt as a titanium source, water-soluble inorganic aluminum salt as an aluminum source, urea as a nitrogen source and cetyl trimethyl ammonium bromide as a template agent to obtain a suspension D, transferring the suspension to a hydrothermal kettle, carrying out hydrothermal reaction, after hydrothermal reaction is finished, washing, carrying out suction filtering to obtain filter mud, granulating and shaping the filter mud, then drying to obtain nitrogen-doped silicon-aluminum immobilized TiO2 precursor, and sintering the nitrogen-doped silicon-aluminum immobilized TiO2 precursor to obtain the nitrogen-doped silicon-aluminum immobilized TiO2 porous ceramic. According to the invention, urea is used as the nitrogen source, under hydrothermal high-temperature and high-pressure conditions, N-H bond in urea can replace oxygen in Ti-O to firmly bond in a chemical bond form, thus effective doping is achieved; and in addition, lattice distortion generated due to nitrogen entering TiO2 lattice can broaden photoresponse range of TiO2 and increase photocatalysis activity under visible light.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a nitrogen-doped silicon-aluminum immobilized TiO 2 Porous ceramics (N / TiO 2 -SiAl) preparation method. Background technique [0002] TiO 2 As a cheap, non-toxic, energy-saving and high-efficiency photocatalytic material, it can not only effectively degrade organic pollutants in the air and water, but also not cause secondary pollution to the human body and the environment. catalyst. At the same time, TiO 2 It also has a killing effect on germs in the air, and can also be widely used in air purification treatment in hospitals, vehicles and ships, and farms. But due to TiO 2 It is a wide-bandgap semiconductor with low utilization rate of light energy. It can only absorb and utilize ultraviolet light that accounts for 3% to 4% of the sunlight on the earth's surface, and accounts for the vast majority of visible light in the sunlight spectrum (about 45% of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 张超武刘昌涛肖玲徐彬王芬赵艺孙宗泉焦杨
Owner SHAANXI UNIV OF SCI & TECH
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