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Method for preparing nano layered g-C3N4/Ag@AgCl composite photocatalytic material

A composite photocatalysis, nano-layered technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low reusability, low catalytic performance, etc. The effect of large specific surface area and enhanced stability

Active Publication Date: 2017-05-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For g-C in the prior art 3 N 4 / Ag@AgBr composite photocatalyst has low catalytic performance and low recycling rate. The present invention provides a nano-layered g-C with environmental friendliness, special shape, good stability and enhanced catalytic performance. 3 N 4 / Ag@AgCl composite photocatalytic material preparation method, g-C prepared by this method 3 N 4 / Ag@AgCl material has good photogenerated electron-hole separation efficiency and photocatalytic degradation of pollutants

Method used

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  • Method for preparing nano layered g-C3N4/Ag@AgCl composite photocatalytic material
  • Method for preparing nano layered g-C3N4/Ag@AgCl composite photocatalytic material
  • Method for preparing nano layered g-C3N4/Ag@AgCl composite photocatalytic material

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Experimental program
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Embodiment 1

[0029] First prepare porous graphite phase carbon nitride powder, weigh 30g of urea in a crucible, place it in a muffle furnace, raise the temperature to 160°C, keep it for 60min, the heating rate is 5°C / min, continue to heat up to 550°C, the heating rate 20°C / min, keep warm for 2h, take it out after cooling and grind it for later use; weigh 400mg of porous graphite phase carbon nitride powder and place it in a polytetrafluoroethylene liner, add 80mL of isopropanol, stir for 30min, and keep warm at 180°C After cooling for 12 hours, centrifuge to obtain a solid; add the above solid to 100mL water, and ultrasonically peel for 60min; centrifuge the liquid after ultrasonic peeling for 10min, and the centrifuge speed is 3000rpm, take the upper liquid and dry it to obtain nano-layered g-C 3 N 4 . Dissolve 0.1g of silver nitrate and 0.4g of PVP (K30) in 50mL of absolute ethanol to obtain a yellow solution; slowly drop 300μL of saturated sodium chloride solution into the above yellow...

Embodiment 2

[0031] First prepare porous graphite phase carbon nitride powder, weigh 30g of urea in a crucible, put it in a muffle furnace, raise the temperature to 170°C, keep it for 50min, the heating rate is 8°C / min, continue to heat up to 560°C, the heating rate at 25°C / min, keep warm for 2.5h, take it out after cooling and grind it for later use; weigh 400mg of porous graphite phase carbon nitride powder and place it in a polytetrafluoroethylene liner, add 80mL of isopropanol, stir for 30min, and heat at 165°C Insulate for 15 hours, cool and centrifuge to obtain a solid; add the above solid to 100mL of water, and ultrasonically peel for 50min; centrifuge the ultrasonically stripped liquid for 10min at a centrifuge speed of 3000rpm, take the upper liquid and dry to obtain nano-layered g-C 3 N 4 . Dissolve 0.1g of silver nitrate and 0.4g of PVP (K30) in 50mL of absolute ethanol to obtain a yellow solution; slowly drop 400μL of saturated sodium chloride solution into the above yellow so...

Embodiment 3

[0033] First prepare porous graphite phase carbon nitride powder, weigh 30g of urea in a crucible, put it in a muffle furnace, raise the temperature to 180°C, keep it for 40min, the heating rate is 10°C / min, continue to heat up to 580°C, the heating rate 30°C / min, keep warm for 2h, take it out after cooling and grind it for later use; weigh 400mg of porous graphite phase carbon nitride powder and place it in a polytetrafluoroethylene liner, add 80mL of isopropanol, stir for 30min, and keep warm at 150°C After cooling for 18 hours, centrifuge to obtain a solid; add the above solid to 100mL water, and ultrasonically strip it for 40min; centrifuge the liquid stripped by ultrasonic for 10min, the speed of the centrifuge is 3000rpm, take the upper liquid and dry it to obtain nano-layered g-C 3 N 4 . Dissolve 0.1g of silver nitrate and 0.4g of PVP (K30) in 50mL of absolute ethanol to obtain a yellow solution; slowly drop 500μL of saturated sodium chloride solution into the above ye...

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Abstract

The invention discloses a method for preparing a nano layered g-C3N4 / Ag@AgCl composite photocatalytic material. The method comprises the following steps: firstly, performing two-sectional urea heating thermal polymerization so as to prepare porous g-C3N4, performing thermal treatment with a solvent on the porous g-C3N4, performing ultrasonic peeling in water so as to obtain nano layered g-C3N4 colloid, preparing a hollow cubic Ag@AgCl nano material by taking ethanol as a solvent, sodium chloride as a template and silver nitrate as a silver source, and finally, performing ultrasonic compounding on the nano layered g-C3N4 and Ag@AgCl, thereby obtaining the nano layered g-C3N4 / Ag@AgCl composite photocatalytic material. As nano layered g-C3N4 is distributed on the surface of Ag@AgCl to form a heterogeneous structure, the stability of the nano layered g-C3N4 / Ag@AgCl composite photocatalytic material prepared by using the method can be effectively improved, light corrosion of Ag@AgCl is retarded, and the material is high in catalysis property under visible light and sunshine, and has very good application prospects in fields such as photocatalytic water pollution treatment.

Description

technical field [0001] The invention relates to a nano-layered g-C 3 N 4 The invention discloses a method for preparing an Ag@AgCl composite photocatalytic material, which belongs to the technical field of composite material preparation and photocatalysis. Background technique [0002] g-C 3 N 4 / Ag@AgX (X=Cl, Br, I), due to the surface plasmon resonance characteristics of metallic silver, it has obvious absorption of visible light, is resistant to acids and alkalis, and its structure and properties are easy to control, and it has good photocatalysis It has become a research hotspot in the field of photocatalysis. [0003] traditional block g-c 3 N 4 The / Ag@AgX composite has a small specific surface area, low yield and poor stability when combined with Ag@AgX, and the photocatalytic performance is not significantly improved. To boost g-C 3 N 4 The recombination efficiency, visible light catalytic activity and catalytic stability of Ag@AgX composites, the researcher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J37/082B01J37/345B01J35/396B01J35/39
Inventor 夏明珠王有亮李克斌沈新林
Owner NANJING UNIV OF SCI & TECH
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