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Preparation method of CeO2/AgBr composite microsphere visible-light-driven photocatalysts

A technology of composite microspheres and visible light, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of microsphere preparation and photocatalytic performance that have not been reported.

Inactive Publication Date: 2013-12-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CeO 2 The preparation and photocatalytic performance of AgBr microspheres have not been reported

Method used

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  • Preparation method of CeO2/AgBr composite microsphere visible-light-driven photocatalysts
  • Preparation method of CeO2/AgBr composite microsphere visible-light-driven photocatalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Take 70 mL of diethylene glycol in a round bottom flask, add 0.01 mol of cerium acetate, slowly raise the temperature to 90°C, keep it warm for 8 hours, then add 0.00025 mol of silver nitrate, and continue the reaction for 0.5 hours. It is then washed, filtered, and vacuum dried. Then the dried powder was added to 3mL saturated bromine water, reacted for 1h, and finally filtered, washed, and dried to obtain CeO 2 / AgBr composite microsphere material. The X-ray powder diffraction experiment was carried out on the obtained sample, and its morphology and structure were observed under a transmission electron microscope.

[0018] According to the CeO that the process parameter of embodiment 1 makes 2 / AgBr composite microspheres visible photocatalyst XRD patterns such as figure 1 shown. There is obvious CeO in the map 2 , The characteristic diffraction peak of AgBr.

[0019] CeO 2 / AgBr composite microsphere visible photocatalyst sample TEM such as figure...

Embodiment 2

[0020] Example 2: Take 50mL of ethylene glycol in a round bottom flask, add 0.01mol of cerium acetate, slowly raise the temperature to 100°C, keep it warm for 5h, then add 0.0001mol of silver nitrate, and continue the reaction for 0.5h. It is then washed, filtered, and vacuum dried. Add the dried powder to 1 mL of saturated bromine water, react for 1 h, filter, wash, and dry to obtain CeO 2 / AgBr composite microsphere material. Subsequent detection was as in Example 1.

Embodiment 3

[0021] Example 3: Take 90 mL of ethylene glycol in a round-bottomed flask, add 0.01 mol of cerium acetate, slowly raise the temperature to 100° C., keep it warm for 8 hours, then add 0.0003 mol of silver nitrate, and continue the reaction for 1 hour. It is then washed, filtered, and vacuum dried. Then the dried powder was added to 5mL saturated bromine water, reacted for 1h, and finally filtered, washed, and dried to obtain CeO 2 / AgBr composite microsphere material. Subsequent detection was as in Example 1.

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Abstract

The invention relates to a method for compounding CeO2 / AgBr composite microsphere visible-light-driven photocatalysts in two steps under a mild condition. The method is characterized by using alcohols as a reaction solvent, using cerium acetate hydrate, silver nitrate and saturated bromine water as raw materials, assembling CeO2 into microspheres under a hot-alcohol condition, simultaneously using the alcohol to carry out reduction on Ag+ and enabling the Ag+ to be immobilized on the microspheres, and then using the bromine water to carry out oxidation to obtain the CeO2 / AgBr composite microsphere visible-light-driven photocatalysts. Due to unique effects of CeO2 and AgBr, the compounding probability of photo-generated electron hole pairs can be effectively reduced, and meanwhile the stability and the photocatalytic activity of the AgBr are enhanced. The CeO2 / AgBr composite microsphere visible-light-driven photocatalysts prepared through the method can be widely applied to the fields of environmental pollution improvement, preparation of photocatalysis function materials and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic nanocomposites and functional materials, especially CeO 2 The preparation method of / AgBr composite microsphere visible light catalyst. Background technique [0002] CeO 2 It is an important compound in the rare earth family, which can be used in catalytic materials for automobile exhaust purification, high-temperature oxygen-sensitive materials, solid oxide fuel cell (SOFC) electrode materials, chemical mechanical polishing (CMP) abrasive materials, etc. In addition, CeO 2 As an n-type semiconductor, its light absorption threshold is about 420nm, which is higher than TiO, the most commonly used semiconductor material at present. 2 388nm. At the same time, its lattice O 2- Ions are easily missing, resulting in C e o 2 The high electron concentration in the crystal makes it have a faster interfacial electron transfer reaction when it is excited by light, and its excellent oxygen adsorption ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J35/08
Inventor 胡宗林赵晓兵李霞章陆晓旺刘英杰钱程李志娜刘高鹏汪亚运李丽丽
Owner CHANGZHOU UNIV
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