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Preparation method of phosphotungstic acid and carbon nitride composite photocatalyst

A carbon nitride, phosphotungstic acid technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve the problems of difficult recovery and limited industrial application, etc. Achieve the effects of easy recovery, improved photocatalytic efficiency and high product purity

Active Publication Date: 2015-04-22
NANJING TIANSHI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of heteropoly acid being easily soluble in water and not easy to recycle, its industrial application is limited.

Method used

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  • Preparation method of phosphotungstic acid and carbon nitride composite photocatalyst
  • Preparation method of phosphotungstic acid and carbon nitride composite photocatalyst
  • Preparation method of phosphotungstic acid and carbon nitride composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take a certain amount of melamine and put it into a crucible, calcinate it at a temperature of 550°C for 4 hours, and grind the product finely in an agate mortar after cooling with the furnace to obtain yellow C 3 N 4 solid powder. Add 0.3g of phosphotungstic acid to the mixture of 25ml of water and 25ml of ethanol, stir for 1h, add 0.6g of carbon nitride, and continue stirring for 1h. The precipitate was separated by centrifugation and washed 3 times with deionized water and absolute ethanol. After drying in a drying oven at 100°C for 4 hours, a composite photocatalyst of phosphotungstic acid and carbon nitride can be obtained. The yield of the composite photocatalyst was 98%.

Embodiment 2

[0025] Take a certain amount of melamine and put it into a crucible, calcinate it at a temperature of 550°C for 4 hours, and grind the product finely in an agate mortar after cooling with the furnace to obtain yellow C 3 N 4 solid powder. Add 0.35g of phosphotungstic acid to the mixture of 25ml of water and 25ml of ethanol, stir for 1h, add 0.6g of carbon nitride, and continue stirring for 1h. The precipitate was separated by centrifugation and washed 3 times with deionized water and absolute ethanol. After drying in a drying oven at 100°C for 4 hours, a composite photocatalyst of phosphotungstic acid and carbon nitride can be obtained. The yield of the composite photocatalyst was 99%.

Embodiment 3

[0027] Take a certain amount of melamine and put it into a crucible, calcinate it at a temperature of 550°C for 4 hours, and grind the product finely in an agate mortar after cooling with the furnace to obtain yellow C 3 N 4 solid powder. Add 0.4g of phosphotungstic acid to the mixture of 25ml of water and 25ml of ethanol, stir for 1h, add 0.6g of carbon nitride, and continue stirring for 1h. The precipitate was separated by centrifugation and washed 3 times with deionized water and absolute ethanol. After drying in a drying oven at 100°C for 4 hours, a composite photocatalyst of phosphotungstic acid and carbon nitride can be obtained. The yield of the composite photocatalyst was 97%.

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Abstract

The invention belongs to the preparation field of photocatalysts and in particular relates to a preparation method of phosphotungstic acid and carbon nitride composite photocatalyst. The preparation method comprises the following steps: (1) calcining tripolycyanamide, carrying out furnace cooling, and porphyrizing to obtain yellow solid carbon nitride powder; and (2) adding phosphotungstic acid into a mixed solution of water and ethyl alcohol, stirring, adding with carbon nitride obtained in the step (1), stirring continuously, carrying out centrifugal separation on sediments, washing and drying to obtain the target product-phosphotungstic acid and carbon nitride composite photocatalyst. The process is simple, the cost is low, the recovery operation is easy, the product purity is high, the photocatalytic effect of the target product is remarkable and the method is suitable for volume production.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, in particular to a method for preparing a composite photocatalyst of phosphotungstic acid and carbon nitride. Background technique [0002] In today's society, energy crisis and environmental pollution have become the key issues hindering human progress [Qiu Mingyan, Zhang Tianyong, Li Bin, etc. Materials Herald A: Review, 2012,26(3):48-52.], how to solve these two The thorny problem has become the research focus of many scholars. Photocatalytic reaction is the use of ultraviolet or visible light energy conversion into the energy required for chemical reactions to generate catalytic action, so that the surrounding oxygen and water molecules are excited into free radicals with great oxidizing ability, which can decompose most of the organic pollutants and inorganic substances. Once a breakthrough is made in photocatalytic hydrogen production technology, the energy crisis can be effectivel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18
Inventor 赵荣祥李秀萍
Owner NANJING TIANSHI NEW MATERIAL TECH
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