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Silver phosphate/titanium dioxide composite material for photochemical catalysis and preparation method thereof

A technology of titanium dioxide and composite materials, applied in the field of photocatalysis, can solve problems such as silver phosphate corrosion and reduce structural stability, and achieve the effects of increasing active points, easy operation, and large specific surface area

Inactive Publication Date: 2013-02-27
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silver phosphate is slightly soluble in water, which reduces its structural stability
Moreover, the photocatalytic process is usually accompanied by the conversion of silver ions to elemental silver, resulting in the photocorrosion of silver phosphate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Preparation of titanium dioxide: Dissolve 5mL titanium tetraisopropoxide in 30mL isopropanol, adjust the pH value of the solution to 1 with concentrated hydrochloric acid; take another 0.5mL deionized water and dissolve it in 8mL isopropanol; Alternately filter on cellulose filter paper, then wash off unreacted titanium tetraisopropoxide with 50mL ethanol; finally place the cellulose filter paper with titanium dioxide gel attached at 450 o Under C air atmosphere, remove cellulose filter paper, obtain titanium dioxide;

[0022] 2) Dissolve 0.003mol of sodium dihydrogen phosphate in 20mL of deionized water, and then ultrasonically disperse 0.06g of titanium dioxide in the above solution;

[0023] 3) Dissolve 0.004mol of silver acetate in 20mL of deionized water, slowly add it dropwise to the solution obtained in step 2 under the condition of magnetic stirring, continue to react for 6 hours after the dropwise addition, filter, wash, 60 o C under vacuum drying to obtain...

Embodiment 2

[0025] 1) Same as Step 1 of Example 1;

[0026] 2) Dissolve 0.006mol of potassium dihydrogen phosphate in 20mL of deionized water, and then ultrasonically disperse 0.08g of titanium dioxide in the above solution;

[0027] 3) Dissolve 0.008mol of silver acetate in 20mL of deionized water, slowly add it dropwise to the solution obtained in step 2 under the condition of magnetic stirring, continue to react for 6 hours after the dropwise addition, filter, wash, 60 o C under vacuum drying to obtain silver phosphate / titanium dioxide composite material.

Embodiment 3

[0029] 1) Same as Step 1 of Example 1;

[0030] 2) Dissolve 0.003mol of sodium dihydrogen phosphate in 20mL of deionized water, and then ultrasonically disperse 0.06g of titanium dioxide in the above solution;

[0031] 3) Dissolve 0.004mol of silver nitrate in 20mL of deionized water, slowly add it dropwise to the solution obtained in step 2 under the condition of magnetic stirring, continue to react for 6 hours after the dropwise addition, filter, wash, 60 o C under vacuum drying to obtain silver phosphate / titanium dioxide composite material.

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Abstract

The invention relates to a silver phosphate / titanium dioxide composite material for photochemical catalysis and a preparation method thereof. The preparation method comprises the following steps of (1) preparing titanium dioxide; (2) dissolving a certain amount of dihydric phosphate into deionized water to prepare a solution with the concentration of 0.05-0.5mol / L and then dispersing 0.05-0.1g of titanium dioxide obtained in the step (1) in the solution; and (3) dissolving a certain amount of silver salt in the deionized water to prepare a solution with the concentration of 0.05-0.5mol / L and then adding the solution into the solution obtained in the step (2) under the magnetic stirring condition in a dropwide mode; continuing to perform reaction for 6 hours after dropwise addition and then performing filtering, washing and vacuum drying at 60 DEG C to obtain the silver phosphate / titanium dioxide composite material. The silver phosphate / titanium dioxide composite material for the photochemical catalysis has the remarkable advantages of effectively avoiding composition of photogenerated electrons and holes, promoting the photochemical catalysis process, increasing an active point of the photochemical catalysis and being simple in preparation method.

Description

technical field [0001] The invention relates to a high-efficiency photocatalyst silver phosphate / titanium dioxide composite material and a preparation method thereof, belonging to the field of photocatalysis. Background technique [0002] With the rapid development of social economy, environmental problems are becoming more and more serious. Using photocatalysis to eliminate and degrade organic pollutants in wastewater is an effective pollution control method, and it is also one of the research hotspots in the field of environmental protection. In recent years, people have researched and developed many semiconductor photocatalysts, among which silver phosphate, a highly efficient visible light catalyst, has received more and more attention. However, silver phosphate is slightly soluble in water, which reduces its structural stability. Moreover, the photocatalytic process is usually accompanied by the conversion of silver ions to elemental silver, resulting in the photocorr...

Claims

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Application Information

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IPC IPC(8): B01J27/18
Inventor 陈郁勃李亮刘玉兰郑华明喻湘华
Owner WUHAN INSTITUTE OF TECHNOLOGY
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