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Method for preparing Au/g-C3N4 composite-type micro-nano material

A g-c3n4, micro-nano technology, applied in the field of material science, can solve problems such as complex preparation process, achieve the effects of simple production process, lower reaction energy barrier, and inhibit CO poisoning phenomenon

Inactive Publication Date: 2014-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The group of Markus Antonietti in Germany reported an Au / g-C 3 N 4 The preparation method of heterojunction composite materials, its characterization and application, but the preparation process is complicated and needs to be completed at a higher temperature

Method used

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  • Method for preparing Au/g-C3N4 composite-type micro-nano material
  • Method for preparing Au/g-C3N4 composite-type micro-nano material
  • Method for preparing Au/g-C3N4 composite-type micro-nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 2g of cyanamide into an alumina crucible, place the crucible in a muffle furnace, and -1 The temperature was raised to 400°C at the heating rate. When the set temperature is reached, the constant temperature reaction is carried out for 7h. Then naturally cooled to room temperature, the final yellow powder object is g-C 3 N 4 . Nitrogen protection was used during the reaction (nitrogen flow rate was 10 mL min -1 ). Yellow powder g-C 3 N 4 Grind in an agate mortar for 0.5 h for later use.

[0027] Weigh 0.12g g-C 3 N 4 Mix in 35mL HAuCl 4 4H 2 O (concentration: 2mM), disperse it evenly by ultrasonication for 5min to obtain a yellow suspension, then magnetically stir for 60min at a stirring speed of 1000r min -1 . Add 265 mL of deionized water to dilute the above suspension, and then transfer it to a water bath at 50°C, the color of the suspension turns light yellow. Under vigorous stirring (stirring speed is 1500r min -1 ) was added dropwise with 3.9m...

Embodiment 2

[0029] Weigh 2g of cyanamide into an alumina crucible, place the crucible in a muffle furnace, -1 The temperature was raised to 600°C at the heating rate. When the set temperature is reached, the constant temperature reaction is carried out for 5h. Then naturally cooled to room temperature, the final yellow powder object is g-C 3 N 4 . Use nitrogen protection during the reaction (nitrogen flow rate is 15mL min -1 ). Yellow powder g-C 3 N4 Grind in an agate mortar for 1 h for later use.

[0030] Weigh 0.1g g-C 3 N 4 Mix in 25mL HAuCl 4 4H 2 O (concentration: 3mM), disperse it evenly by ultrasonication for 8min to obtain a yellow suspension, then magnetically stir for 40min at a stirring speed of 1500r min -1 . Add 275 mL of deionized water to dilute the above suspension, and then transfer it to a water bath at 65°C, the color of the suspension turns light yellow. Under vigorous stirring (stirring speed is 2000r min -1 ) was added dropwise with 3.5mL Na 3 Ct (conc...

Embodiment 3

[0040] Weigh 2g of cyanamide into an alumina crucible, place the crucible in a muffle furnace, -1 The temperature was raised to 700°C at the heating rate. When the set temperature is reached, the constant temperature reaction is carried out for 3h. Then naturally cooled to room temperature, the final yellow powder object is g-C 3 N 4 . Use nitrogen protection during the reaction (nitrogen flow rate is 20mL min -1 ). Yellow powder g-C 3 N 4 Grind in an agate mortar for 2h for later use.

[0041] Weigh 0.09g g-C 3 N 4 Mix in 18mL HAuCl 4 4H 2 O (concentration: 4mM), disperse it evenly by ultrasonication for 10min to obtain a yellow suspension, then magnetically stir for 30min at a stirring speed of 1500r min -1 . Add 282 mL of deionized water to dilute the above suspension, and then transfer it to a water bath at 80°C, the color of the suspension turns light yellow. Under vigorous stirring (stirring speed is 3000r min -1 ) was added dropwise with 2.9mLNa 3 Ct (co...

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Abstract

The invention relates to a method for preparing Au / g-C3N4 composite-type micro-nano material. The method is realized by steps of adding g-C3N4 powder in 400-900nano in granularity to chloroauric acid solution, ultrasonically dispersing the g-C3N4 powder so as to prepare turbid liquid; heating the turbid liquid in water bath; then, adding sodium citrate to solution, stirring, washing, separating and drying a mixture so as to obtain Au / g-C3N4 composite-type micro-nano material; the Au / g-C3N4 composite-type micro-nano material has excellent photochemical catalysis effect to formic acid oxidation; and oxidation potential is negatively shifted by 800mV (close to the catalytic oxidation potential of Pt) without ctalyst poisoning phenomenon. According to the advantages of the invention, acquired composite material particles are even and not united; a preparation method is simple; and cost is relatively low.

Description

technical field [0001] The present invention relates to a kind of Au / g-C 3 N 4 The preparation method of composite micro-nano material, the prepared Au / g-C 3 N 4 Composite micro-nano material has excellent photoelectric catalytic ability; it belongs to the field of material science. technical background [0002] Environmental pollution and energy shortage have become serious problems facing the world in the 21st century. Solar energy is recognized as an ideal alternative energy source. Therefore, semiconductor photocatalytic materials that convert solar energy into other energies have become the most potential application hotspots in the field of energy and materials. Non-metallic polymers - graphite-like carbon nitride or g-C 3 N 4 , because of its smaller forbidden bandwidth (2.7eV) than conventional semiconductor materials, good visible light response activity, simple preparation process, low price, and environmental friendliness, it has broad application prospects ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J23/52B01J37/03C04B35/58C04B35/622
Inventor 向娟常守勤彭贞宾艳南
Owner CENT SOUTH UNIV
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