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Method for preparing photocatalyst doping with mesopore nanometer titanium oxide

A nano-titanium oxide and photocatalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as differences in photocatalyst performance, and achieve increased practicability, effective doping, high The effect of catalytic activity

Inactive Publication Date: 2008-06-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a method for preparing doped mesoporous nano-titanium oxide photocatalyst, which solves the problem that nano-titanium oxide has non-metal element doping and mesoporous structure at the same time, and solves the problem that the performance difference of photocatalyst is relatively large. major issues

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  • Method for preparing photocatalyst doping with mesopore nanometer titanium oxide
  • Method for preparing photocatalyst doping with mesopore nanometer titanium oxide
  • Method for preparing photocatalyst doping with mesopore nanometer titanium oxide

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Embodiment 1

[0029] Dissolve 10ml of tetrabutyl titanate in 35ml of tetrabutanol, stir for 2 hours to form a uniformly dispersed solution; then add dropwise to 100ml of deionized water acidified with nitric acid (pH=3) for hydrolysis, and form a uniformly dispersed solution after stirring for 5 hours Emulsion, the resulting emulsion was transferred to a 250ml reactor for hydrothermal treatment at 100°C for 8h. Then 1g of hexamethylenetetramine was dissolved into the emulsion after hydrothermal treatment, and the solution was added dropwise to 50ml of aqueous solution in which 5g of P123 surfactant was dissolved. The whole dropping process was stirred and dropped in a water bath at 50°C, stirred for 2h (uniformly), then moved back into the reactor, and then hydrothermally treated at 130°C for 36h. Finally, the obtained emulsion was dried at 90°C and sintered at 500°C for 3 h (the heating rate was 3°C min -1 , with a cooling rate of 4°C min -1 ), to obtain nitrogen-doped mesoporous nanocry...

Embodiment 2

[0034]Dissolve 16ml of isopropyl titanate in 40ml of isopropanol, stir for 3 hours to form a uniformly dispersed solution; then add dropwise to 80ml of nitric acid acidified deionized water (pH=1) dissolved in 1g of iodic acid and 0.1g of iodine After hydrolysis and stirring for 3 hours, a uniformly dispersed emulsion was formed, and the resulting emulsion was transferred to a 250ml reactor for hydrothermal treatment at 70°C for 6 hours. Then 1g of iodic acid and 0.1g of iodine were dissolved into the emulsion after the hydrothermal treatment, and the solution was added dropwise to 70ml of an aqueous solution in which 6g of P123 surfactant was dissolved. The whole dropping process was stirred and dropped in a water bath at 50°C, stirred for 2h (uniformly), and then moved back into the reaction kettle for hydrothermal treatment at 150°C for 48h. Finally, the obtained emulsion was dried at 90°C and sintered at 400°C for 3 h (the heating rate was 3°C min -1 , with a cooling rate...

Embodiment 3

[0036] Dissolve 8ml of titanium tetrachloride in 20ml of ethylene glycol, stir for 3 hours to form a uniformly dispersed solution; then add dropwise to 80ml of deionized water acidified with hydrochloric acid (pH=5) for hydrolysis, and form a uniformly dispersed emulsion after stirring for 5 hours The resulting emulsion was transferred to a 250ml reactor for hydrothermal treatment at 120°C for 12h. Then 0.5g of thiourea and 0.8g of hexamethylenetetramine were dissolved into the hydrothermally treated emulsion, and the solution was added dropwise to 120ml of aqueous solution in which 5g of F123 surfactant was dissolved. The entire dropping process was stirred and dropped in a water bath at 60°C, stirred for 2h (uniformly), and then moved back into the reactor for hydrothermal treatment at 170°C for 36h. Finally, the obtained emulsion was dried at 90°C and sintered at 700°C for 5 h (the heating rate was 5°C min -1 , with a cooling rate of 4°C min -1 ), to obtain nitrogen-doped...

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Abstract

The invention relates to a preparation technique of a doped photocatalyst of mesoporous nanocrystalline titanium oxide, in particular to a method of preparing non-metallic ion-doped photocatalyst of mesoporous nanocrystalline titanium oxide by two hydrothermal processes. By adopting the invention, mesoporous structured nanocrystalline titanium oxide doped with non-metallic elements can be acquired; a preparation method of doping (nitrogen-doping and iodine-doping) and effectively combing the non-metallic elements with mesoporous structure is adopted, which is characterized in that proper dopant is selected and two hydrothermal processes are carried out: seed crystal of titanium oxide is acquired in the first hydrothermal process and added with the dopant; seed crystal acquired in the first hydrothermal process is utilized. The mesoporous structure can be obtained through self assembly, and then the mesoporous structured nanocrystalline titanium oxide doped with non-metallic elements is acquired. The photocatalyst thus prepared has the advantages of a big-ratio superficial area, small grain size, and high visible absorption, etc., and as the mesoporous structure constructed by nanocrystalline particles has good auto-deposition effect, the invention can hopefully be applied in water processing.

Description

technical field [0001] The invention relates to a preparation technology of doped mesoporous nanometer titanium oxide photocatalyst, specifically a method for preparing a nonmetal ion-doped mesoporous nanometer titanium oxide photocatalyst by using a two-step hydrothermal process, which is expected to be used in an efficient water treatment process. Background technique [0002] Oxidation-reduction reactions occur in the photocatalytic reaction process, which can effectively remove pollutants. Therefore, in the field of air purification and water purification, it has incomparable advantages over traditional treatment methods, such as high efficiency, economy, strong operability, and good circulation. advantage. [0003] Due to the many advantages of nano-TiO (such as high efficiency, environmental friendliness, non-toxicity and low cost, etc.), it is considered to be the most promising photocatalyst for air and water purification so far. Due to the large band gap (3.2eV) of...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/10
Inventor 成会明刘岗李峰赵燕宁刘敏逯高清
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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