Method for producing interpose porus titanium dioxide photocatalyst by hydro-thermal method in weak acid condition

A mesoporous titanium dioxide and photocatalyst technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. To reduce the types and dosages, the reaction conditions are easy to control, and the hydrolysis speed is slow.

Inactive Publication Date: 2009-10-21
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The type and amount of organic reagents used in this synthesis method are large, so a lot of reagent waste is caused in the synthesis process, and it is necessary to remove various added organic substances in the mesoporous material to obtain activity through heating and crystallization afterwards. TiO 2
And the used strong acid in the synthetic experiment has bigger pollution and corrosion to environment and experimental equipment; And in HCl or HNO 3 In the inorganic acid medium, the formation of titanium gel is fast and difficult to control, forming the product TiO 2 The particle size is larger, which will lead to a decrease in photocatalytic activity

Method used

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  • Method for producing interpose porus titanium dioxide photocatalyst by hydro-thermal method in weak acid condition
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  • Method for producing interpose porus titanium dioxide photocatalyst by hydro-thermal method in weak acid condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Take 20 g of n-butyl titanate and add it dropwise into 120 mL of vigorously stirred acetic acid solution, the volume percentage of the acetic acid solution is 20%, and continue stirring for 4 hours to obtain an acetic acid solution of n-butyl titanate. Dissolve 1.5g of P123 in 10mL of absolute ethanol and stir until it is completely dissolved to obtain an ethanol solution of the non-ionic template agent. Then, the ethanol solution dissolved in P123 was added dropwise to the acetic acid solution of n-butyl titanate under vigorous stirring, and after the dropwise addition was completed, the stirring was continued for 24 hours to obtain a titanium sol.

[0020] (2) Transfer the stirred titanium sol to a polytetrafluoroethylene bottle, heat it with water at 120°C for 24 hours, and dry the product after hydroheating in an oven at 80°C to obtain a yellow gel-like solid, and then dry the dried solid Calcined at 300° C. for 4 hours in a muffle furnace to obtain a mesoporous...

Embodiment 2

[0022] (1) Take 20 g of n-butyl titanate and add it dropwise into 120 mL of vigorously stirred acetic acid solution, the volume percentage of the acetic acid solution is 20%, and continue stirring for 4 hours to obtain an acetic acid solution of n-butyl titanate. Dissolve 1.5g of P123 in 10mL of absolute ethanol and stir until it is completely dissolved to obtain an ethanol solution of the non-ionic template agent. Then, the ethanol solution dissolved in P123 was added dropwise to the acetic acid solution of n-butyl titanate under vigorous stirring, and after the dropwise addition was completed, the stirring was continued for 24 hours to obtain a titanium sol.

[0023] (2) Transfer the stirred titanium sol to a polytetrafluoroethylene bottle, heat it with water at 120°C for 24 hours, and dry the product after hydroheating in an oven at 80°C to obtain a yellow gel-like solid, and then dry the dried solid Calcined at 450° C. for 4 hours in a muffle furnace to obtain a mesoporous...

Embodiment 3

[0025] Preparation of mesoporous titania with P123 as template:

[0026] (1) Take 20 g of n-butyl titanate and add it dropwise into 120 mL of vigorously stirred acetic acid solution, the volume percentage of the acetic acid solution is 20%, and continue stirring for 4 hours to obtain an acetic acid solution of n-butyl titanate. Dissolve 1.5g of P123 in 10mL of absolute ethanol and stir until it is completely dissolved to obtain an ethanol solution of the non-ionic template agent. Then, the ethanol solution dissolved in P123 was added dropwise to the acetic acid solution of n-butyl titanate under vigorous stirring, and after the dropwise addition was completed, the stirring was continued for 24 hours to obtain a titanium sol.

[0027] (2) Transfer the stirred titanium sol to a polytetrafluoroethylene bottle, heat it with water at 120°C for 24 hours, and dry the product after hydroheating in an oven at 80°C to obtain a yellow gel-like solid, and then dry the dried solid Calcine...

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Abstract

The invention discloses a method for preparing a mesoporous titanium dioxide photocatalyst by a hydrothermal method under weak acid conditions. In the method, an acetic acid solution of n-butyl titanate and an ethanol solution of a non-ionic template agent are mixed and stirred to form a titanium sol; The titanium sol is heated at 80-200°C for 12-148 hours, and the product after hydroheating is dried to obtain a gel-like solid, and then the dried solid is calcined at 300-750°C for 2-10 hours to obtain mesoporous Titanium dioxide photocatalyst. The method has a simple preparation process and less damage to equipment and the environment, and the prepared mesoporous titanium dioxide photocatalyst has uniform pore diameter distribution, large specific surface area and large average pore diameter.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a method for preparing mesoporous titanium dioxide photocatalysts by hydrothermal method under weak acid conditions. Background technique [0002] Mesoporous materials are new multifunctional materials developed since the 1990s. They have many advantages such as well-formed pores, uniform pore size, adjustable pore size within a certain range, and large specific surface area. At the same time, titanium dioxide has excellent photoelectric performance and photocatalytic performance. Mesoporous titania photocatalysts have both the characteristics and advantages of mesoporous materials and titania, so the research on mesoporous titania has become a worldwide research hotspot. Among the many methods for preparing mesoporous titanium dioxide, whether it is the sol-gel reaction of the precursor or the self-assembly of the template is a process of reducing the entropy of the syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06
Inventor 安太成刘冀锴李桂英曾祥英傅家谟盛国英
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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