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Preparation method of titanium dioxide photocatalyst of plant graded structure

A hierarchical structure, titanium dioxide technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low concentration and difficult industrialization, and achieve the effect of simple process

Inactive Publication Date: 2009-07-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching the literature of the prior art, it is found that there are also some patent reports on the preparation of titanium dioxide photocatalysts with hierarchical structures, such as Chinese patent 200710036799.X, titled "Preparation method of photocatalytic materials with three-dimensional network hierarchical structure with controllable crystal phase" , the patent uses the eggshell as a template to achieve the replication of the three-dimensional network structure of the eggshell by impregnating the method. Due to the low concentration of the process, the problem of the reaction time of several days cannot be solved, and it is difficult to industrialize

Method used

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  • Preparation method of titanium dioxide photocatalyst of plant graded structure

Examples

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Embodiment 1

[0026] In the first step, the Chinese fir wood block is put into 5wt% HCl solution for 3 hours to dissolve minerals that are not easy to be removed by sintering, then rinse with distilled water and dry. Then add 10wt% H 2 o 2 / NaOH solution at 60°C for 3 hours to dissolve most of the lignin. After taking out the wooden block, rinse it with distilled water and dry it for later use.

[0027] The second step is the preparation of the precursor solution. TiCl 4 Solution preparation scheme: under the condition of ice-water bath, water: concentrated hydrochloric acid: TiCl 4 Mix and stir at a volume ratio of 15:5:1 for 10 minutes to prepare a precursor solution with a concentration of 7.5% by weight.

[0028] In the third step, put the processed fir wood block into the prepared precursor solution for ultrasonic treatment, the ultrasonic power is 100W, and the ultrasonic time is 10 hours.

[0029] In the fourth step, after the ultrasonic wave is over, the sample is taken out, r...

Embodiment 2

[0033] In the first step, the Chinese fir wood block is put into 5wt% HCl solution for 3 hours to dissolve minerals that are not easy to be removed by sintering, then rinse with distilled water and dry. Then add 10wt% H 2 o 2 / NaOH solution at 60°C for 3 hours to dissolve most of the lignin. After taking out the wooden block, rinse it with distilled water and dry it for later use.

[0034] The second step is the preparation of the precursor solution. TiCl 4 Solution preparation scheme: under the condition of ice-water bath, water: concentrated hydrochloric acid: TiCl 4 Mix and stir at a volume ratio of 15:5:1.3 for 10 minutes to prepare a precursor solution with a concentration of 9.6% by weight.

[0035]In the third step, put the treated fir wood block into the prepared precursor solution for ultrasonic treatment, the ultrasonic power is 300W, and the ultrasonic time is 8 hours.

[0036] In the fourth step, after the ultrasonic wave is over, the sample is taken out, rin...

Embodiment 3

[0038] In the first step, the Chinese fir wood block is put into 5wt% HCl solution for 3 hours to dissolve minerals that are not easy to be removed by sintering, then rinse with distilled water and dry. Then add 10wt% H 2 o 2 / NaOH solution at 60°C for 3 hours to dissolve most of the lignin. After taking out the wooden block, rinse it with distilled water and dry it for later use.

[0039] The second step is the preparation of the precursor solution. TiCl 4 Solution preparation scheme: under the condition of ice-water bath, water: concentrated hydrochloric acid: TiCl 4 Mix and stir at a volume ratio of 15:5:2.04 for 10 minutes to prepare a precursor solution with a concentration of 14.3% by weight.

[0040] In the third step, put the treated fir wood block into the prepared precursor solution for ultrasonic treatment, the ultrasonic power is 400W, and the ultrasonic time is 5 hours.

[0041] In the fourth step, after the ultrasound is finished, the sample is taken out, r...

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Abstract

The invention relates to a method for preparing a titanium dioxide photocatalyst with a plant hierarchical structure in the technical field of photocatalysis. The method comprises the following steps: selecting a plant with a hierarchical structure as a template, and pre-treating the surface of the plant; preparing titanium tetrachloride solution or titanium alcoholic solution as a precursor solution; putting the treated plant into the prepared precursor solution to carry out ultrasonic treatment; and after the ultrasonic treatment is finished, taking out the plant, cleaning the plant by distilled water, drying the cleaned plant, and roasting the plant to remove the biological template to obtain a titanium dioxide material keeping the plant hierarchical structure. The titanium dioxide with the plant hierarchical structure prepared by the method has larger specific surface area and three-dimensional communicated pore canal structure, has higher photocatalysis property, and has wide application prospect on environmental governance such as organic pollutant degradation, and the like, self-cleaning, and the like.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst in the technical field of photocatalysis, in particular to a method for preparing a titanium dioxide photocatalyst with a plant hierarchical structure. Background technique [0002] Multi-scale and multi-level structure materials, due to the porous structure and three-dimensional interconnected pores of the material itself, provide channels for gas transmission and liquid flow, and the coupling of structure and materials is expected to greatly improve the performance of materials. Titanium dioxide photocatalyst has the characteristics of high activity, good stability, and wide band gap. It is an important photocatalyst. It has broad application prospects in the fields of photodecomposition of organic pollutants, assembly of solar cells, photolysis of water to produce hydrogen and oxygen, etc. . The photocatalytic efficiency of titanium dioxide is mainly determined by three factors: crysta...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/02B01J37/34
Inventor 朱申敏张荻周钢蒋海波李进龙
Owner SHANGHAI JIAO TONG UNIV
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