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A kind of carbon dots/carbon nitride/titanium dioxide composite material and its preparation method and application

A technology of titanium dioxide and composite materials, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve problems such as ineffective effects, achieve enhanced migration, enhanced photocatalytic activity, and improved photocatalytic hydrogen production active effect

Inactive Publication Date: 2020-04-21
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon dots (C-dots) have attracted much attention because of their unique electron transfer properties, but when they are used as photocatalysts alone, the effect is not obvious

Method used

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  • A kind of carbon dots/carbon nitride/titanium dioxide composite material and its preparation method and application
  • A kind of carbon dots/carbon nitride/titanium dioxide composite material and its preparation method and application
  • A kind of carbon dots/carbon nitride/titanium dioxide composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A carbon dot / carbon nitride / titanium dioxide (C-dots / g-C 3 N 4 / TiO 2 ) The preparation method of composite material, comprises the steps:

[0030] (1) Titanium dioxide (TiO 2 ) Preparation of nanosheets: First, add 25ml tetrabutyltitanate (TBT) and 3ml hydrofluoric acid into a polytetrafluoroethylene reactor, stir and mix evenly, place the reactor in an oven and heat to 180°C, The holding time is 24 hours. After the reaction, the reactor is cooled to room temperature, and then the product obtained is washed with 1M sodium hydroxide to neutrality, then washed with water and ethanol three times, and finally the product is dried to obtain titanium dioxide (TiO 2 )Nanosheets;

[0031] (2) Preparation of carbon nitride (g-C 3 N 4 ): First, weigh 1.2g of urea and 2.5g of melamine in a molar ratio of 1:1, grind and mix them evenly in a mortar, then transfer the mixture into a semi-closed crucible, and heat it in a muffle furnace to 550°C for Calcining, the holding time...

Embodiment 2

[0035] A carbon dot / carbon nitride / titanium dioxide (C-dots / g-C 3 N 4 / TiO 2 ) The preparation method of composite material, comprises the steps:

[0036] (1) Titanium dioxide (TiO 2 ) Preparation of nanosheets: First, add 25ml tetrabutyltitanate (TBT) and 3ml hydrofluoric acid into a polytetrafluoroethylene reactor, stir and mix evenly, place the reactor in an oven and heat to 180°C, The holding time is 24 hours. After the reaction, the reactor is cooled to room temperature, and then the product obtained is washed with 1M sodium hydroxide to neutrality, then washed with water and ethanol three times, and finally the product is dried to obtain titanium dioxide (TiO 2 )Nanosheets;

[0037] (2) Preparation of carbon nitride (g-C 3 N 4 ): First, weigh 1.2g of urea and 2.5g of melamine in a molar ratio of 1:1, grind and mix them evenly in a mortar, then transfer the mixture into a semi-closed crucible, and heat it in a muffle furnace to 550°C for Calcining, the holding time...

Embodiment 3

[0041] A carbon dot / carbon nitride / titanium dioxide (C-dots / g-C 3 N 4 / TiO 2 ) The preparation method of composite material, comprises the steps:

[0042] (1) Titanium dioxide (TiO 2 ) Preparation of nanosheets: First, add 25ml tetrabutyltitanate (TBT) and 3ml hydrofluoric acid into a polytetrafluoroethylene reactor, stir and mix evenly, place the reactor in an oven and heat to 180°C, The holding time is 24 hours. After the reaction, the reactor is cooled to room temperature, and then the product obtained is washed with 1M sodium hydroxide to neutrality, then washed with water and ethanol three times, and finally the product is dried to obtain titanium dioxide (TiO 2 )Nanosheets;

[0043] (2) Preparation of carbon nitride (g-C 3 N 4 ): First, weigh 1.2g of urea and 2.5g of melamine in a molar ratio of 1:1, grind and mix them evenly in a mortar, then transfer the mixture into a semi-closed crucible, and heat it in a muffle furnace to 550°C for Calcining, the holding time...

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Abstract

The invention discloses a carbon dot / carbon nitride / titanium dioxide composite material, which is composed of three-phase carbon dots, graphene-like carbon nitride and titanium dioxide; among them, carbon nitride has a large surface area, which is just right Provides a depositable space for titanium dioxide nanosheets to prevent titanium dioxide from agglomerating. At the same time, the narrow bandgap width of carbon nitride can increase the photoresponse range. Moreover, the present invention also uses the unique electron transfer ability of carbon dots to further suppress The recombination of photogenerated electron pairs increases the photocatalytic performance. In addition, the preparation method of the present invention has mild process conditions, low cost, is suitable for large-scale production, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic materials, and in particular relates to a layered carbon dot / carbon nitride / titanium dioxide composite material capable of enhancing photocatalytic hydrogen production activity and its preparation method and application. Background technique [0002] With the environmental and energy problems left by the country's rapid development, the development of new energy has become an issue of our increasing concern. Among them, solar energy and hydrogen energy are two new energy sources with great potential. Hydrogen energy is a green energy with high combustion calorific value (the heat generated by burning the same mass of hydrogen is about 3 times that of gasoline, 3.9 times that of alcohol, and 4.5 times that of coke), and the combustion product (water) is non-polluting; while solar energy It is an inexhaustible clean energy. If solar energy can be efficiently and economically u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J27/24B01J35/39Y02E60/36
Inventor 向全军李阳冯雄汉鲁哲学殷辉刘凡
Owner HUAZHONG AGRI UNIV
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