A kind of cadmium sulfide/cobalt-phosphate composite photocatalytic material and preparation method thereof

A composite photocatalysis and photocatalysis technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of rare and expensive precious metals, and solve the problems of low sunlight utilization efficiency and cost The effect of low and effective circulation

Active Publication Date: 2019-03-08
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, noble metals are very rare and expensive, and are not always ideal co-catalysts. There is an urgent need for an earth-abundant co-catalyst that can replace noble metals.

Method used

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  • A kind of cadmium sulfide/cobalt-phosphate composite photocatalytic material and preparation method thereof
  • A kind of cadmium sulfide/cobalt-phosphate composite photocatalytic material and preparation method thereof
  • A kind of cadmium sulfide/cobalt-phosphate composite photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Prepare 60mL of mixed solution of ethylenediamine and water (volume ratio: 2:1), disperse 12.5mmol of cadmium nitrate tetrahydrate in the above mixed solution under the action of ultrasound, then add 37.5mmol of thiourea, and place it under magnetic force at room temperature Stir vigorously under the action of a stirrer for 6 hours until the solution is uniformly mixed, then transfer the uniformly mixed solution to a 100 mL polytetrafluoroethylene-lined hydrothermal kettle, and then keep it at 160°C for 24 hours. The obtained precipitate was fully centrifuged with water and ethanol, washed, dried in vacuum for 10 hours, and ground into a powdery solid with an agate mortar to obtain cadmium sulfide nanorods.

[0030] 2) Prepare phosphate buffer solution: prepare 0.2 mol / L aqueous solution of disodium hydrogen phosphate dodecahydrate; prepare 0.2 mol / L aqueous solution of sodium dihydrogen phosphate dihydrate; take 61 mL of disodium hydrogen phosphate solution configure...

Embodiment 2

[0036] Pure cadmium sulfide nanorods were prepared by the method in Example 1.

[0037] 2mmol of the cadmium sulfide nanorods prepared above was added to the three-necked flask that was equipped with 50ml of neutral phosphate buffer solution with a concentration of 0.2mol / L prepared by sodium dihydrogen phosphate and disodium hydrogen phosphate, and the three-necked flask was After sealing, ultrasonically disperse for 15 minutes so that the cadmium sulfide nanorods are uniformly dispersed in the above buffer solution. Use a 1mL pipette to take 1mL of cobalt nitrate hexahydrate solution with a concentration of 0.02mol / L, and add it dropwise to the buffer solution in which the cadmium sulfide nanorods are dispersed. 15 minutes to make the cobalt ions evenly dispersed in the solution. The above prepared solution was placed at a distance of 20 cm from a 300W xenon lamp for 3 hours, and then the solution was left to stand until the yellow solid was completely precipitated, and the...

Embodiment 3

[0040] Pure cadmium sulfide nanorods were prepared by the method in Example 1.

[0041] Prepare 60mL of a mixed solution of ethylenediamine and water (volume ratio: 2:1), disperse 12.5mmol of cadmium nitrate tetrahydrate in the above mixed solution under the action of ultrasound, then add 37.5mmol of thiourea, and place in a magnetic stirrer at room temperature Stir vigorously under the action of the solution until the solution is uniformly mixed, then transfer the uniformly mixed solution to a 100mL polytetrafluoroethylene-lined hydrothermal kettle, and then keep it at 180°C for 22 hours. The obtained precipitate is fully centrifuged with water and ethanol, washed, vacuum-dried, and ground into a powdery solid with an agate mortar to obtain cadmium sulfide nanorods.

[0042] 2mmol of the cadmium sulfide nanorods prepared above was added to the three-necked flask that was equipped with 50ml of 0.1mol / L neutral phosphate buffer prepared by sodium dihydrogen phosphate and disodi...

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Abstract

The invention relates to a cadmium sulfide / cobalt-phosphate composite photocatalytic material and a preparation method thereof. The cadmium sulfide / cobalt-phosphate composite photocatalytic material is formed by cadmium sulfide nanorods and cobalt-phosphate amorphous particles deposited on their surface. The preparation method comprises the preparation steps: 1), dispersing the cadmium sulfide nanorods in a phosphate buffer solution under the ultrasonic action to obtain cadmium sulfide dispersion, adding cobalt nitrate hexahydrate solution precursor into the dispersion, with the cobalt nitrate hexahydrate being 1-20% by volume of cadmium sulfide by cobalt, and stirring well to obtain precursor solution; 2), irradiating the precursor solution obtained in step 1) with xenon lamp, standing the solution until yellow solid fully precipitates, washing obtained precipitate with water and ethanol solution, vacuum drying, and grinding to obtain powder. This composite material has great ability to photocatalytically decompose water to produce hydrogen under the irradiation of visible light and has sufficient visible light photocatalytic activity and stability.

Description

technical field [0001] The invention relates to the technical field of photocatalytic material synthesis, in particular to a cadmium sulfide / cobalt-phosphate composite photocatalytic material and a preparation method thereof. Background technique [0002] Due to the rapid consumption of fossil fuels and increasing environmental pollution, hydrogen energy has attracted extensive research interest as an environmentally friendly and high-combustion fuel. Although a large number of semiconductor materials have been widely used in photocatalytic water splitting, the utilization of sunlight is mostly limited to ultraviolet light (accounting for 4% of sunlight), in order to effectively utilize solar energy, it is urgent to design and develop A photocatalyst that absorbs visible light (50% of sunlight). Metal sulfides have attracted a lot of interest in recent years due to their very suitable bandgap width and their excellent catalytic performance. Among them, cadmium sulfide with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185C01B3/04
CPCB01J27/1853B01J35/004B01J37/344C01B3/042C01B2203/1052C01B2203/1082Y02E60/36
Inventor 余家国张军狄廷敏
Owner WUHAN UNIV OF TECH
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