Preparation method of crystal phase controllable three dimensional hierarchical structure photocatalytic material

A photocatalytic material and three-dimensional network technology, applied in the field of new materials, can solve the problems of not reaching the ideal size, difficult industrial promotion, difficult particle classification and morphology, etc., and achieve the effect of improving people's life quality, simple and environmentally friendly process, and low cost

Inactive Publication Date: 2007-08-01
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

For example, the title of Chinese patent 02104344.2 is: "Method for controlling the crystal form of nano-titanium dioxide and the nano-titanium dioxide obtained therefrom" and the title of patent 200610012458.4 is "A method for preparing nano-scale titanium dioxide by controlling the crystal form", and the process is difficult to avoid long preparatio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select fresh poultry eggs, remove the liquid content, rinse the eggshell with clean water, put it into 1M hydrochloric acid solution for about 10 minutes to peel off the egg film, rinse it fully with clean water and deionized water three times, remove it and blow it at room temperature. Dry in the air; weigh 50 mg of the above-mentioned clean and dry biological material egg film, dip it in 500 ml of 0.05M titanium tetrachloride solution system with pH=1 for 14 hours, take it out and dry it, put it in an induction cooker at 25°C Heat up to 550°C at a heating rate per minute and keep the temperature constant for 1.5 hours, then stop heating, and take it out after the furnace temperature naturally drops to room temperature. The obtained white flakes are composed of titanium dioxide (rutile and anatase phase weight percentages are 80% and 20% respectively), and when used as a photocatalytic material, the decomposition rate of rhodamine B after ultraviolet light irradiation f...

Embodiment 2

[0020] Select fresh poultry eggs, remove the liquid content, rinse the eggshell with clean water, put it into 1M hydrochloric acid solution for about 10 minutes to peel off the egg film, rinse it fully with clean water and deionized water three times, remove it and blow it at room temperature. Dry in the air; weigh 50 mg of the above-mentioned clean and dry biological material egg film, immerse it in the prepared 500ml pH=2 0.05M titanium tetrachloride solution system for 14 hours, take it out and dry it, put it in an induction cooker at 25°C Heat up to 550°C at a heating rate per minute and keep the temperature constant for 1.5 hours, then stop heating, and take it out after the furnace temperature naturally drops to room temperature. The obtained white flakes are composed of titanium dioxide (rutile and anatase phase weight percentages are 35% and 65% respectively), and when used as a photocatalyst material, the decomposition rate of rhodamine B after ultraviolet light irradi...

Embodiment 3

[0022] Select fresh poultry eggs, remove the liquid content, rinse the eggshell with clean water, put it into 1M hydrochloric acid solution for about 10 minutes to peel off the egg film, rinse it fully with clean water and deionized water three times, remove it and blow it at room temperature. Dry in the air; weigh 50 mg of the above-mentioned clean and dry biological material egg film, immerse it in the prepared 500ml pH=3 0.05M titanium tetrachloride solution system for 14 hours, take it out and dry it, put it in an induction cooker at 25°C Heat up to 550°C at a heating rate per minute and keep the temperature constant for 1.5 hours, then stop heating, and take it out after the furnace temperature naturally drops to room temperature. The obtained white flakes are composed of titanium dioxide (rutile and anatase phase weight percentages are 0 and 100% respectively), and when used as a photocatalyst material, the decomposition rate of rhodamine B can reach more than 50% after b...

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Abstract

The invention involves preparation method of three-dimensional network hierarchy photocatalysis materials which crystal phase can be controlled. The method bases on biological template synthesis technology, uses bird eggshell membrane as biological template material, dips the eggshell membrane into titanates prodromal liquid to handling the dip optimization after separating, washing and pretreating the eggshell membrane, then oxygenizes and incandesces it to forming titania nanometer crystal under the action of biological template in original position, then prepares nanometer titania with excellent performance and three-dimensional network hierarchy as photocatalysis material. The prepared photocatalysis material consists of mixing-phase titania crystal grain which grain size is below 20nm, the component percentage of anatase phase and rutile phase can be controlled by adjusting the pH of steeping liquor. The process of the invention is simple, cost is low and the performance of prepared photocatalysis material is stable; it can be used for gas sensor, pressure-active element, nonlinear optical material, solar battery and environmental purification material, it also has good prospect in the electrical, electronic, industrial and civil fields.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional network hierarchical structure photocatalytic material with controllable crystal phase, and prepares a titanium dioxide nanometer photocatalytic semiconductor material with a special braided three-dimensional network hierarchical nanostructure, high specific surface area and controllable crystal phase composition , belonging to the field of new material technology. Background technique [0002] In recent years, with the gradual maturity of nano-synthesis technology, the development and utilization of new nano-semiconductor materials have attracted widespread attention. Among them, titanium dioxide (TiO 2 ) has become one of the photoelectric semiconductor materials with the most potential application value due to its good photoelectric performance, chemical stability, wear resistance and corrosion resistance, and non-toxicity. Currently, nano-TiO 2 It has been widely used in many te...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J32/00
Inventor 苏慧兰董群张荻
Owner SHANGHAI JIAO TONG UNIV
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