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Method without templet of preparing leveled macroporous / mesoporous titanium dioxide catalyze material

A technology of mesoporous titanium dioxide and photocatalytic materials, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as expensive, wasteful environment, pollution, etc.

Inactive Publication Date: 2007-09-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These additional processing steps can be expensive, create waste and pollute the environment

Method used

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  • Method without templet of preparing leveled macroporous / mesoporous titanium dioxide catalyze material
  • Method without templet of preparing leveled macroporous / mesoporous titanium dioxide catalyze material
  • Method without templet of preparing leveled macroporous / mesoporous titanium dioxide catalyze material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Graded macroporous / mesoporous titanium dioxide was prepared by adding butyl titanate dropwise to pure water at room temperature, allowing it to be hydrolyzed, aged, then filtered and dried, and finally calcined at different temperatures. The specific experimental process is as follows: 20 ml of butyl titanate was added dropwise to 200 ml of distilled water under static conditions. The molar concentration of butyl titanate is about 0.3M, and the pH value of the reaction solution is 6-7. After aging for 24 hours, the precipitate is separated and washed repeatedly with distilled water, and then dried at normal temperature and pressure for 24 hours. Finally, the prepared white massive spherical particles were calcined at 300, 400, 500, 600, 700 and 800° C. for 1 hour respectively to obtain graded macroporous / mesoporous titanium dioxide. The freshly prepared titania samples were in the amorphous state. Figure 2 shows the TiO 2 From the XRD patterns of the samples calcined a...

Embodiment 2

[0035] In order to examine the effect of the concentration of butyl titanate on the morphology and photocatalytic activity of graded macroporous / mesoporous titanium dioxide, in addition to the different concentrations of butyl titanate, other reaction conditions such as: the pH value of the reaction solution, the hydrolysis temperature of the solution , the reaction time of the solution etc. are all identical with embodiment 1. The results show that when the concentration of butyl titanate is in the range of 0.005-2M, the prepared titanium dioxide samples all present a hierarchical macroporous / mesoporous structure and have good photocatalytic activity. It is found in the experiment that the optimum concentration range of butyl titanate is 0.1-0.8M.

Embodiment 3

[0037] In order to examine the effect of the pH value of the reaction solution on the morphology and photocatalytic activity of the graded macroporous / mesoporous titanium dioxide, in addition to the different pH values ​​of the reaction solution, other reaction conditions such as: the concentration of the reaction solution, the reaction temperature of the solution, the temperature of the solution Reaction time etc. are all identical with embodiment 1. The results show that when the pH value of the reaction solution is higher than 7 (adjusted with ammonia water) and 9, the prepared titanium dioxide samples all present a hierarchical macroporous / mesoporous structure and have good photocatalytic activity. However, when the pH of the reaction solution was lower than 7 (adjusted with hydrochloric acid), the as-prepared titania samples partially exhibited a hierarchical macroporous / mesoporous structure, and the photocatalytic activity of the samples decreased significantly. The opti...

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Abstract

The no-template process of preparing gradated macroporous / mesoporous titania photocatalyst includes dropping butyl titanate into distilled water without stirring, ageing for 24 hr, separating out the precipitate, repeated washing with distilled water, drying at normal temperature and normal pressure for 24 hr, and final high temperature calcining to obtain gradated macroporous / mesoporous titania photocatalyst. Thus prepared macroporous / mesoporous titania photocatalyst is superior to that obtained through a traditional template process, and has high heat stability and high photocatalytic activity. The process features simple operation, low temperature, no template and additive, solvent of water, environment friendship, etc.

Description

technical field [0001] The invention relates to a template-free method for preparing graded macroporous / mesoporous titania photocatalytic materials, and the invention also relates to a non-template method for graded macroporous / mesoporous structure materials such as transition metal oxides such as zirconia, niobium oxide, and vanadium oxide. Template preparation technology field. technical background [0002] In recent years, the preparation of hierarchically ordered macroporous / mesoporous materials with multiple scales has attracted a lot of attention and interest for both fundamental research and practical applications. Mesoporous transition metal oxide materials with macroporous structures used as catalysts and adsorbents have become a research hotspot, partly because the mesoporous structure and macroporous structure with interconnected channels can effectively transport guest species to the framework junctions. Some typical templates with specific sizes and structures,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/10
Inventor 余家国苏耀荣程蓓
Owner WUHAN UNIV OF TECH
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