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Preparation method of silver phosphate/graphite phase carbon nitride composite photocatalyst

A graphitic carbon nitride, composite light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of uneven particle size distribution, prone to agglomeration catalytic activity, etc. Good catalytic effect, large contact surface and uniform distribution

Inactive Publication Date: 2018-12-18
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For existing g-C 3 N 4 / Ag 3 PO 4 g-C present in the preparation method 3 N 4 or Ag 3 PO 4 In order to solve the problems of uneven particle size distribution, easy agglomeration and low catalytic activity, the present invention provides an Ag with good crystallinity, uniform distribution, high catalytic activity and good stability. 3 PO 4 / g -C 3 N 4 Preparation method of composite photocatalyst

Method used

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  • Preparation method of silver phosphate/graphite phase carbon nitride composite photocatalyst
  • Preparation method of silver phosphate/graphite phase carbon nitride composite photocatalyst
  • Preparation method of silver phosphate/graphite phase carbon nitride composite photocatalyst

Examples

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Embodiment 1

[0025] (1) g-C 3 N 4 Preparation of urea: Weigh 50g of urea into a crucible with a cover, put it into a muffle furnace for high-temperature calcination, the calcination temperature is 550°C, and the calcination time is 3h. After the calcination, it is naturally cooled to room temperature and ground to obtain a light yellow powder g-C 3 N 4 ;

[0026] (2)Ag 3 PO 4 Preparation: Weigh 1.26g AgNO 3 Dissolve in 50mL deionized water to obtain solution A, weigh 0.9gNa 2 HPO 4 12H 2 O was dissolved in 50mL deionized water to obtain solution B. Under the action of ultrasonic oscillation, solution B was dropped dropwise into solution A for about 20 minutes. A yellow precipitate was formed immediately, centrifuged, washed with water, washed with ethanol several times, and dried. Dry, get Ag 3 PO 4 ;

[0027] (3)Ag 3 PO 4 / g -C 3 N 4Preparation of composite photocatalyst: Weigh 0.115g g-C 3 N 4 Disperse in 50mL deionized water, ultrasonic 1h to disperse in water, add 1.26...

Embodiment 2

[0034] Embodiment 2 is basically the same as Embodiment 1, the only difference is that g-C in the third step 3 N 4 The amount added is 0.055g, and the obtained Ag 3 PO 4 / g -C 3 N 4 Ag in composite photocatalyst 3 PO 4 The mass fraction is 95%, recorded as ACN-95.

Embodiment 5

[0040] To measure the catalytic activity of the photocatalyst, a 500W xenon lamp was used as a light source, and a 420nm filter was added to remove ultraviolet light. Accurately weigh the catalyst, Ag 3 PO 4 and g-C 3 N 4 Disperse in 20mg / L rhodamine B solution for photocatalytic determination, and perform 30min dark adsorption before visible light irradiation to reach adsorption-desorption equilibrium. Then turn on the light source, take 4mL of the suspension every 10min, centrifuge at 8000r / s for 5min to remove the catalyst, and measure the absorbance of the supernatant at 552nm with a UV-Vis spectrophotometer. The activity curve of photocatalytic degradation of Rhodamine B is as follows: Image 6 As shown, we can see that the catalyst activity is: ACN-95>ACN-90>Ag 3 PO 4 >ACN-80>ACN-60>g-C 3 N 4 , and 95% of the composite photocatalyst completely degrades Rhodamine B within 15 minutes. Therefore, 95% Ag 3 PO 4 / g -C 3 N 4 The degradation efficiency is the best....

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Abstract

The invention discloses a preparation method of a silver phosphate / graphite phase carbon nitride composite photocatalyst. The preparation method comprises: preparing g-C3N4 through thermal condensation polymerization of urea, carrying out ultrasonic treatment on the prepared g-C3N4 while mechanically stirring to uniformly disperse the g-C3N4 in water, adding AgNO3, dissolving, and adding a Na2HPO4solution in a dropwise manner under ultrasonic vibration to obtain the Ag3PO4 / g-C3N4 composite photocatalyst. According to the present invention, the Ag3PO4 / g-C3N4 composite photocatalyst is preparedby using the ultrasonic assisted precipitation method, wherein the crystallinity and the dispersibility of the crystal are increased by using the unique characteristics of ultrasonic cavitation phenomenon and strong mechanical oscillation of ultrasonic waves so as to prepare the composite material with the small particle size, and the heterojunction formed between the Ag3PO4 and the g-C3N4 can significantly improve the separation efficiency of photogenerated hole-electron pairs so as to efficiently degrade organic dyes.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and relates to a preparation method of a silver phosphate / graphite phase carbon nitride composite photocatalyst. Background technique [0002] As a new type of functional material, photocatalytic materials have the advantages of high efficiency, green, environmental protection, zero energy consumption, and no secondary pollution. Ag 3 PO 4 As a photocatalyst, it can decompose water and degrade organic dyes under light. Ag 3 PO 4 The band gap is narrow, and the response ability to visible light is much higher than that of general semiconductor photocatalytic materials, but it is prone to photocorrosion, resulting in Ag 3 PO 4 The stability is poor, and its application value is limited. [0003] g-C 3 N 4 It is a polymer semiconductor containing only C and N elements. It has a layered structure similar to graphite. Because of its narrow band gap and response to visible light, it has...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCC02F1/30B01J27/24B01J37/035B01J37/343C02F2305/10C02F2101/308B01J35/39
Inventor 夏明珠李路王风云雷武
Owner NANJING UNIV OF SCI & TECH
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