Preparation and application of composite CoP/g-C3N4 photocatalyst

A technology of g-c3n4 and complexes, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of expensiveness, wide application limitation, and rare price of precious metals, and achieve the effects of avoiding pollution, economical and easy-to-obtain raw materials, and simple and convenient experimental procedures

Inactive Publication Date: 2017-09-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its wide application is limited due to the scarcity and high price of precious metals.

Method used

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  • Preparation and application of composite CoP/g-C3N4 photocatalyst
  • Preparation and application of composite CoP/g-C3N4 photocatalyst
  • Preparation and application of composite CoP/g-C3N4 photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] g-C 3 N 4 preparation of

[0033] 5 g of melamine and 5 g of ammonium chloride were ground and mixed uniformly in a mortar, then the uniformly mixed powder was placed in a crucible with a cover, and placed in a muffle furnace at a rate of 5 °C / min. to 300°C, then raised to 520°C at a rate of 2°C / min, and then kept at this temperature for 4 hours. After the temperature dropped to room temperature, it was taken out to obtain light yellow g-C 3 N 4 , ground into powder for later use.

[0034] The following cases are CoP and CoP / g-C 3 N 4 The preparation steps:

Embodiment 2

[0036] Weigh 200 mg of cobalt nitrate hexahydrate and 200 mg of hexamethylenetetramine into 50 ml of water in sequence, stir magnetically for 10 min, and sonicate for 10 min, then place the solution in an oil bath at 90°C for 6 hours, the solution was cooled to room temperature, washed by centrifugation, washed three times with water, washed three times with alcohol, and then dried in a vacuum oven at 60°C to obtain Co(OH) 2 . Then take out 50 mg of this compound and place it on one end of the porcelain ark, then place 500 mg of sodium hypophosphite on the other end, place the porcelain ark in a tube furnace, and place the end with sodium hypophosphite near the air inlet At 1°C / min, the temperature was raised to 300°C and kept for 2 hours. The black solid collected after cooling to room temperature is the CoP.

Embodiment 3

[0038] Weigh 0.2 g of g-C 3 N 4 Place it in 50 ml of water and ultrasonically disperse it for 2 hours, which is called solution A. Another 30 mg of cobalt nitrate hexahydrate and an equivalent amount of hexamethylenetetramine were dissolved in 10 ml of deionized water in turn, and magnetically stirred to form a homogeneous solution, called solution B. Then solution B was slowly added dropwise to solution A under magnetic stirring (one drop per second), then magnetic stirring for 10 min, and ultrasonication for 10 min. Place the above solution in an oil bath at 90°C to react for 6 hours. After cooling, wash by centrifugation, wash three times with water, and wash three times with alcohol. Then dry the solid in a vacuum oven to obtain Co(OH) 2 / g -C 3 N 4 Complex. Take out 50 mg Co(OH) 2 / g -C 3 N 4 Compound, then weigh 500 mg of sodium hypophosphite, place the two parts of the drug on the two ends of the porcelain ark, place the porcelain ark in a tube furnace, and plac...

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Abstract

The invention provides a method for in-situ growth of CoP nanoparticles on a g-C3N4 surface and application. The method is mainly characterized in that in-situ growth of Co(OH)2 on carbon nitride is performed according to an in-situ loading method, and then sodium hypophosphite is decomposed under the protection of an inert atmosphere to release PH3 gas to generate CoP. By adoption of the method, the CoP nanoparticles can be uniformly loaded on carbon nitride, and a composite CoP / g-C3N4 photocatalyst is obtained finally. Easiness in raw material acquisition and simplicity in operation are realized, and the composite photocatalyst is innovatively applied to photocatalysis production of hydrogen peroxide; as an auxiliary catalyst, CoP is capable of enhancing visible light absorbability, and owing to the metalloid property of CoP, quick separation of electrons and holes can be realized, and absorbed light can be used more efficiently, and finally catalysis activity of carbon nitride being a main catalyst in photocatalysis production of hydrogen peroxide is effectively improved.

Description

technical field [0001] The invention relates to the field of nanometer material and photocatalysis. Background technique [0002] As an environmentally friendly oxidant, hydrogen peroxide is widely used in wastewater treatment, pulp bleaching, and sterilization processes. And in recent years, due to its wide application in selective oxidation, the demand for it is increasing. However, the traditional production method consumes a lot of energy and pollutes the environment seriously, thus greatly increasing the pressure on energy and the environment. Therefore, there is an urgent need to develop a new method and utilize clean energy to produce hydrogen peroxide. Among them, the use of photocatalysts, driven by solar energy, and the photocatalytic production of hydrogen peroxide in an oxygen atmosphere have great research value and application prospects. [0003] In recent years, some scholars have reported the method of producing hydrogen peroxide based on the semiconductor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B15/026
CPCB01J27/24B01J35/004C01B15/026
Inventor 张金龙雷菊英彭玉兰
Owner EAST CHINA UNIV OF SCI & TECH
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