Carbon quantum dot, precious metal and zinc indium sulfide composite photocatalyst and preparation method thereof

Abstract

The invention relates to a carbon quantum dot, precious metal and zinc indium sulfide composite photocatalyst and a preparation method thereof. The composite photocatalyst contains a hexagonal-phase zinc indium sulfide (ZnIn2S4) matrix, and reduced carbon quantum dots and precious metal particles which are carried on the surface of the ZnIn2S4 matrix, wherein the ZnIn2S4 matrix is of a peony-flower-shaped structure, the particle size of the matrix is 0.1-10 micrometers and the BET specific surface area of the matrix is 10-200 m<2> / g; the particle size of the carbon quantum dots and the precious metal particles is 1-10 nm; precious metal refers to one or a mixture of some of gold, platinum, silver or palladium. The composite photocatalyst has high catalytic activity (with a hydrogen production rate up to 1mmol.h<-1>g<-1>) under irradiation of visible light (more than or equal to 400nm), and has long service life (over 50 hours).

Description

technical field

[0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a composite photocatalyst of carbon quantum dots, noble metals and indium-zinc sulfide and a preparation method thereof. Background technique

[0002] Fujishima and Honda at TiO since 1972 2 Since the photocatalytic decomposition of water to produce hydrogen and oxygen has been realized on the electrode (A.Fujishima, K.Honda, Nature1972, 238, 37.), this technology of directly converting solar energy into chemical energy through semiconductor photocatalysts is widely used in the field of environment and energy. It has great application prospects and has received extensive attention.

[0003] In sunlight, ultraviolet light accounts for a small proportion of only 4%, while visible light accounts for as much as 43%. Therefore, in recent years, people have paid more and more attention to the development of photocatalysts that respond to visible light. Recently rep...

Examples

Embodiment 1

[0028] Disperse 1mmol of zinc chloride, 2mmol of indium chloride and 4mmol of thiourea in a mixed solution of 2mL of ethanol, 2mL of acetone and 20mL of water, add 1mL of 1-butyl-3-methylimidazolium tetrafluoroborate, and then add 5mL of It was an ethanol dispersion of carbon quantum dots at 1 mg / mL, and stirred for 30 minutes to obtain a uniform and transparent mixed solution. The mixed solution was transferred to a reaction kettle, and then placed in a microwave hydrothermal synthesizer for microwave hydrothermal treatment at 200° C. for 1 hour. The power of the microwave hydrothermal synthesizer was 800W. After the reactor was cooled to room temperature, the precipitate was collected by centrifugation, washed with water and ethanol several times in sequence, and then dried at 80°C to obtain the reduced carbon quantum dot and indium zinc sulfide complex. Disperse 0.1g of the above compound in 10mL water, add 20mg polyethylene glycol 2000 and 0.05mL chloroplatinic acid hexahydr...

Embodiment 2

[0031] Disperse 1mmol of zinc acetate, 2mmol of indium acetate and 20mmol of thioacetamide in a mixed solution of 5mL of ethanol, 25mL of acetone and 50mL of water, add 8mL of 1-butyl-3-methylimidazole chloride, and then add 2.5mL of 10 mg / mL ethanol solution of carbon quantum dots was stirred for 30 min to obtain a uniform and transparent mixed solution. The mixed solution was transferred to a reaction kettle, and placed in a microwave hydrothermal synthesizer for microwave hydrothermal treatment at 240° C. for 0.5 h. The power of the microwave hydrothermal synthesizer was 300W. After the reaction kettle was cooled to room temperature, the precipitate was collected by centrifugation, washed with water and ethanol several times in turn, and then dried at 150°C to obtain the reduced carbon quantum dot and indium-zinc sulfide complex. Disperse 0.4g of the above compound in 4mL of water, add 4mg of polyethylene glycol 20000 and an aqueous solution containing 8mg of chloroauric ac...

Embodiment 3

[0034] Disperse 1mmol of zinc sulfate, 1mmol of indium sulfate and 15mmol of dimethyl sulfoxide in a mixed solution of 15mL of ethanol, 20mL of acetone and 45mL of water, add 0.8mL of 1-butyl-3-methylimidazole bromide, and then add 2.1mL The ethanol solution of carbon quantum dots with a concentration of 100 mg / mL was stirred for 30 min to obtain a uniform and transparent mixed solution. The mixed solution was transferred to a reaction kettle, and then placed in a microwave hydrothermal synthesizer for microwave hydrothermal treatment at 80° C. for 5 hours. The power of the microwave hydrothermal synthesizer was 100 W. After the reaction kettle was cooled to room temperature, the precipitate was collected by centrifugation, washed with water and ethanol several times in sequence, and then dried at 30°C to obtain the reduced carbon quantum dot and indium zinc sulfide complex. Disperse 0.1g of the above compound in 10mL of water, add 10mg of polyethylene glycol 400 and an aqueou...

technical field

[0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a composite photocatalyst of carbon quantum dots, noble metals and indium-zinc sulfide and a preparation method thereof. Background technique

[0002] Fujishima and Honda at TiO since 1972 2 Since the photocatalytic decomposition of water to produce hydrogen and oxygen has been realized on the electrode (A.Fujishima, K.Honda, Nature1972, 238, 37.), this technology of directly converting solar energy into chemical energy through semiconductor photocatalysts is widely used in the field of environment and energy. It has great application prospects and has received extensive attention.

[0003] In sunlight, ultraviolet light accounts for a small proportion of only 4%, while visible light accounts for as much as 43%. Therefore, in recent years, people have paid more and more attention to the development of photocatalysts that respond to visible light. Recently rep...

Examples

Embodiment 1

[0028] Disperse 1mmol of zinc chloride, 2mmol of indium chloride and 4mmol of thiourea in a mixed solution of 2mL of ethanol, 2mL of acetone and 20mL of water, add 1mL of 1-butyl-3-methylimidazolium tetrafluoroborate, and then add 5mL of It was an ethanol dispersion of carbon quantum dots at 1 mg / mL, and stirred for 30 minutes to obtain a uniform and transparent mixed solution. The mixed solution was transferred to a reaction kettle, and then placed in a microwave hydrothermal synthesizer for microwave hydrothermal treatment at 200° C. for 1 hour. The power of the microwave hydrothermal synthesizer was 800W. After the reactor was cooled to room temperature, the precipitate was collected by centrifugation, washed with water and ethanol several times in sequence, and then dried at 80°C to obtain the reduced carbon quantum dot and indium zinc sulfide complex. Disperse 0.1g of the above compound in 10mL water, add 20mg polyethylene glycol 2000 and 0.05mL chloroplatinic acid hexahydr...

Embodiment 2

[0031] Disperse 1mmol of zinc acetate, 2mmol of indium acetate and 20mmol of thioacetamide in a mixed solution of 5mL of ethanol, 25mL of acetone and 50mL of water, add 8mL of 1-butyl-3-methylimidazole chloride, and then add 2.5mL of 10 mg / mL ethanol solution of carbon quantum dots was stirred for 30 min to obtain a uniform and transparent mixed solution. The mixed solution was transferred to a reaction kettle, and placed in a microwave hydrothermal synthesizer for microwave hydrothermal treatment at 240° C. for 0.5 h. The power of the microwave hydrothermal synthesizer was 300W. After the reaction kettle was cooled to room temperature, the precipitate was collected by centrifugation, washed with water and ethanol several times in turn, and then dried at 150°C to obtain the reduced carbon quantum dot and indium-zinc sulfide complex. Disperse 0.4g of the above compound in 4mL of water, add 4mg of polyethylene glycol 20000 and an aqueous solution containing 8mg of chloroauric ac...

Embodiment 3

[0034] Disperse 1mmol of zinc sulfate, 1mmol of indium sulfate and 15mmol of dimethyl sulfoxide in a mixed solution of 15mL of ethanol, 20mL of acetone and 45mL of water, add 0.8mL of 1-butyl-3-methylimidazole bromide, and then add 2.1mL The ethanol solution of carbon quantum dots with a concentration of 100 mg / mL was stirred for 30 min to obtain a uniform and transparent mixed solution. The mixed solution was transferred to a reaction kettle, and then placed in a microwave hydrothermal synthesizer for microwave hydrothermal treatment at 80° C. for 5 hours. The power of the microwave hydrothermal synthesizer was 100 W. After the reaction kettle was cooled to room temperature, the precipitate was collected by centrifugation, washed with water and ethanol several times in sequence, and then dried at 30°C to obtain the reduced carbon quantum dot and indium zinc sulfide complex. Disperse 0.1g of the above compound in 10mL of water, add 10mg of polyethylene glycol 400 and an aqueou...

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