Transition metal phosphide/g-C3N4 composite material as well as preparation method and application thereof

Abstract

The invention provides a transition metal phosphide / g-C3N4 composite material as well as a preparation method and application thereof. According to the transition metal phosphide / g-C3N4 composite material, transition metal phosphide is loaded on g-C3N4, the compounding of photoelectrons and holes can be remarkably reduced and hydrogen evolution over-potential is reduced, so that the photo-catalytic reaction activity of the g-C3N4 is improved; the transition metal phosphide / g-C3N4 composite material can be applied to a photo-catalytic reaction system and especially can be used in a photo-catalytic water decomposition and hydrogen production system. According to the preparation method provided by the invention, the interface bonding performance of the transition metal phosphide and the g-C3N4 can be improved so that the catalytic activity is improved; furthermore, the preparation method is simple to operate, wide in applicability, good in repeatability and wide applicable range; a reliable scheme is provided for reduction of the photo-catalytic cost and photo-catalytic hydrogen production.

Description

technical field

[0001] The present invention relates to the field of photocatalyst technology, more specifically, to a transition metal phosphide / g-C 3 N 4 Composite materials and their preparation methods and applications. Background technique

[0002] In order to solve the problems of energy crisis and environmental pollution, hydrogen has attracted extensive attention as an ideal substitute for fossil fuels. After the concept of photoelectrochemical water splitting was proposed by Fujishima and Honda in 1972, researchers developed various photocatalysts, including oxides, sulfides, nitrides, nitrogen oxides, carbides and their composites. However, due to its own shortcomings, such as high electron-hole recombination rate, insufficient visible light absorption, low specific surface area, few active sites for surface reactions, slow surface reaction kinetics, low oxidation ability and low charge mobility Wait. In addition, the oxidation ability of photogenerated holes c...

Examples

Embodiment 1

[0044] (1) g-C 3 N 4 Preparation: 40g of urea was put into a 150ml crucible and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min, and then cooled to room temperature and calcined at 550°C for 2 hours under the same conditions, the reaction was complete After getting yellow g-C 3 N 4 of powder.

[0045] (2) CoNiFeP / g-C 3 N 4 Preparation of composite materials: 300mg g-C 3 N 4 and 4.5mg of nickel nitrate, 0.25mg of cobalt nitrate and 0.25mg of ferric nitrate were added to the beaker, then 40ml of water was added, ultrasonically dispersed for two hours, and then the suspension was placed in 85°C water heat to dry the water in the reaction system and cooled to room temperature, the obtained sample and 0.2g of sodium hypophosphite were mixed together and calcined at 300°C for 1 hour under a nitrogen atmosphere, then naturally cooled to room temperature, and finally the obtained material was washed and dried naturally to obtain CoNiFeP / g-C 3 N ...

Embodiment 2

[0048] (1) g-C 3 N 4 Preparation: 40g of urea was put into a 150ml crucible and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min, and then cooled to room temperature and calcined at 550°C for 2 hours under the same conditions. After complete, get yellow g-C 3 N 4 of powder.

[0049] (2) CoP / g-C 3 N 4 Preparation of composite materials: 300mg g-C 3 N 4 and 5mg of cobalt nitrate were added to the beaker, then 40ml of water was added, ultrasonically dispersed for two hours, the suspension was placed in 85°C hydrothermal heat to dry the water in the reaction system, cooled to room temperature, the obtained sample and 0.2g hypophosphorous acid Sodium was mixed together and calcined at 300°C for 1 hour under nitrogen atmosphere, then cooled to room temperature naturally, and finally the obtained material was washed and dried naturally to obtain CoP / g-C 3 N 4 Composite material, wherein, the mass percentage of CoP is about 0.5%, g-C 3 N 4 The...

Embodiment 3

[0051] (1) g-C 3 N 4 Preparation: 40g of urea was put into a 150ml crucible and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min, and then cooled to room temperature and calcined at 550°C for 2 hours under the same conditions. After complete, get yellow g-C 3 N 4 of powder.

[0052] (2) NiP / g-C 3 N 4 Preparation of composite materials: 300mg g-C 3 N 4 and 5mg of nickel nitrate were added to the beaker, then 40ml of water was added, ultrasonically dispersed for two hours, the suspension was placed in 85°C hydrothermal heat to dry the water in the reaction system, cooled to room temperature, the obtained sample and 0.2g hypophosphorous acid Sodium was mixed together and calcined at 300°C for 1 hour under a nitrogen atmosphere, then naturally cooled to room temperature, and finally the resulting material was washed and dried naturally to obtain NiP / g-C 3 N 4 Composite material, wherein, the mass percentage of NiP is about 0.5%, g-C 3 N 4 ...

technical field

[0001] The present invention relates to the field of photocatalyst technology, more specifically, to a transition metal phosphide / g-C 3 N 4 Composite materials and their preparation methods and applications. Background technique

[0002] In order to solve the problems of energy crisis and environmental pollution, hydrogen has attracted extensive attention as an ideal substitute for fossil fuels. After the concept of photoelectrochemical water splitting was proposed by Fujishima and Honda in 1972, researchers developed various photocatalysts, including oxides, sulfides, nitrides, nitrogen oxides, carbides and their composites. However, due to its own shortcomings, such as high electron-hole recombination rate, insufficient visible light absorption, low specific surface area, few active sites for surface reactions, slow surface reaction kinetics, low oxidation ability and low charge mobility Wait. In addition, the oxidation ability of photogenerated holes c...

Examples

Embodiment 1

[0044] (1) g-C 3 N 4 Preparation: 40g of urea was put into a 150ml crucible and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min, and then cooled to room temperature and calcined at 550°C for 2 hours under the same conditions, the reaction was complete After getting yellow g-C 3 N 4 of powder.

[0045] (2) CoNiFeP / g-C 3 N 4 Preparation of composite materials: 300mg g-C 3 N 4 and 4.5mg of nickel nitrate, 0.25mg of cobalt nitrate and 0.25mg of ferric nitrate were added to the beaker, then 40ml of water was added, ultrasonically dispersed for two hours, and then the suspension was placed in 85°C water heat to dry the water in the reaction system and cooled to room temperature, the obtained sample and 0.2g of sodium hypophosphite were mixed together and calcined at 300°C for 1 hour under a nitrogen atmosphere, then naturally cooled to room temperature, and finally the obtained material was washed and dried naturally to obtain CoNiFeP / g-C 3 N ...

Embodiment 2

[0048] (1) g-C 3 N 4 Preparation: 40g of urea was put into a 150ml crucible and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min, and then cooled to room temperature and calcined at 550°C for 2 hours under the same conditions. After complete, get yellow g-C 3 N 4 of powder.

[0049] (2) CoP / g-C 3 N 4 Preparation of composite materials: 300mg g-C 3 N 4 and 5mg of cobalt nitrate were added to the beaker, then 40ml of water was added, ultrasonically dispersed for two hours, the suspension was placed in 85°C hydrothermal heat to dry the water in the reaction system, cooled to room temperature, the obtained sample and 0.2g hypophosphorous acid Sodium was mixed together and calcined at 300°C for 1 hour under nitrogen atmosphere, then cooled to room temperature naturally, and finally the obtained material was washed and dried naturally to obtain CoP / g-C 3 N 4 Composite material, wherein, the mass percentage of CoP is about 0.5%, g-C 3 N 4 The...

Embodiment 3

[0051] (1) g-C 3 N 4 Preparation: 40g of urea was put into a 150ml crucible and calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min, and then cooled to room temperature and calcined at 550°C for 2 hours under the same conditions. After complete, get yellow g-C 3 N 4 of powder.

[0052] (2) NiP / g-C 3 N 4 Preparation of composite materials: 300mg g-C 3 N 4 and 5mg of nickel nitrate were added to the beaker, then 40ml of water was added, ultrasonically dispersed for two hours, the suspension was placed in 85°C hydrothermal heat to dry the water in the reaction system, cooled to room temperature, the obtained sample and 0.2g hypophosphorous acid Sodium was mixed together and calcined at 300°C for 1 hour under a nitrogen atmosphere, then naturally cooled to room temperature, and finally the resulting material was washed and dried naturally to obtain NiP / g-C 3 N 4 Composite material, wherein, the mass percentage of NiP is about 0.5%, g-C 3 N 4 ...

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