Preparation method of graphene/g-C3N4 compound photocatalyst

A technology of g-c3n4 and composite light, applied in the field of new energy photocatalytic materials, can solve the problems of g-C3N4 being difficult to dissolve, difficult to uniformly compound graphene, and difficult to surface functional groups, so as to improve the photocatalytic activity, increase the Redox ability, the effect of enhancing charge separation efficiency

Inactive Publication Date: 2014-05-07
JIANGSU YUEDA NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The g-C3N4 prepared by this method is difficult to dissolve in water and organic solvents, and it is very difficult to functionalize its surface, and the specific surface area of ​​g-C3N4 prepared by this method is very small (<5m2 / g), and it is difficult to be uniform with graphene. complex, severely limiting its potential photocatalytic activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 10g of melamine and put it in a muffle furnace, and roast it at a high temperature of 550°C for 2h; add 3g of the roasted powder to 50ml of 20% hydrochloric acid and stir for 2h, then wash with deionized water until the surface is acid-base Value pH=6.7~7.3; The modified Hummers method is used to prepare graphite oxide. During this process, the low-temperature oxidation reaction time is increased to 2h, and then benzyl benzoate is used as a solvent to ultrasonically peel off the graphite oxide. The ultrasonic power is 100w, ultrasound, centrifugation, and finally The supernatant liquid is extracted and dried to obtain polar graphene oxide powder; the graphene oxide powder prepared above and g-C3N4 are mixed with a high-energy ball mill for 60 minutes, and dispersed in hydrazine hydrate. The quality of graphene oxide and hydrazine hydrate The ratio is 10:5. The mixed system was transferred to a polytetrafluoroethylene lined autoclave and reacted at 200°C for 2h. Th...

Embodiment 2

[0024] Weigh 12g of melamine and put it into the muffle furnace, and roast at 550℃ for 2h; add 3g of the roasted powder to 50ml of 37% hydrochloric acid and stir for 2h, then wash with deionized water until the surface is acid-base Value pH=6.7~7.3; The modified Hummers method is used to prepare graphite oxide. During this process, the low-temperature oxidation reaction time is increased to 3h, and then butyrolactone is used as a solvent to ultrasonically peel off the graphite oxide. The ultrasonic power is 100w, ultrasonic, centrifugal, and finally extracted The supernatant liquid is dried to obtain polar graphene oxide powder; the graphene oxide powder prepared above and g-C3N4 are mixed with a high-energy ball mill for 120 minutes, and after being uniformly dispersed, they are dissolved in hydrazine hydrate. The quality of graphene oxide and hydrazine hydrate is matched. The ratio is 10:10. The mixed system was transferred to a polytetrafluoroethylene lined autoclave and rea...

Embodiment 3

[0026] Weigh 15g of melamine and put it in a muffle furnace, and roast it at a high temperature of 550°C for 4h; add 3g of the roasted powder to 50ml of 37% hydrochloric acid and stir for 3h, then wash with deionized water until the surface is acid-base Value pH=6.7~7.3; The modified Hummers method is used to prepare graphite oxide. In this process, the low-temperature oxidation reaction time is increased to 3h, and then benzyl benzoate is used as a solvent to ultrasonically peel off the graphite oxide. The ultrasonic power is 100w, ultrasonic, centrifugal, and finally The supernatant liquid is extracted and dried to obtain polar graphene oxide powder; the graphene oxide powder prepared above and g-C3N4 are mixed with a high-energy ball mill for 180 minutes, and dispersed in hydrazine hydrate. The quality of graphene oxide and hydrazine hydrate The ratio is 10:10. The mixed system was transferred to a polytetrafluoroethylene lined autoclave, and reacted at 200°C for 3 hours. T...

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Abstract

The invention relates to a preparation method of a graphene / g-C3N4 compound photocatalyst, and adopts a high temperature decomposition method to prepare the graphene / g-C3N4 compound photocatalyst. The method comprises the following steps of (1) preparing g-C3N4 powder by adopting concentrated hydrochloric acid melamine through high temperature decomposition; (2) synthesizing high specific surface area graphite oxide by adopting an improved Hummers method, stripping the graphite oxide in an ultrasound manner, removing the graphene with the low oxidation degree through centrifugation, finally extracting a supernatant liquid, drying, and preparing polarity graphene oxide powder; and (3) uniformly mixing the prepared graphene oxide powder and the g-C3N4 through a high energy ball grinder to dissolve in hydrazine hydrate, and preparing the graphene / g-C3N4 compound photocatalyst with a high photocatalytic activity. The preparation method provided by the invention has the advantages that a raw material is cheap, the technology is simple and convenient and the like, and the prepared compound photocatalyst has the wide application prospect on the fields such as wastewater treatment and gas purification.

Description

Technical field [0001] The invention relates to a preparation method of a graphene / g-C3N4 composite photocatalyst, belonging to the field of new energy photocatalytic materials. Background technique [0002] Photocatalyst has become an ideal environmental pollution control and clean energy utilization and production technology due to its advantages of deep reaction at room temperature and the direct or indirect use of solar energy to drive the reaction. Traditional photocatalyst TiO 2 Because of their spectral response in the ultraviolet region, and because photo-generated carriers are very easy to recombine, the quantum efficiency is low, which restricts its use of solar energy and photocatalytic efficiency. People gradually shifted their attention to the development of new photocatalysts with higher quantum efficiency. [0003] g-C3N4, the graphite-like phase C3N4, is a new type of photocatalyst. It has attracted people's attention due to its good chemical stability and narrow b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 董海军杨玉晴徐德善
Owner JIANGSU YUEDA NEW MATERIALS TECH
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