Preparation method of Ag2O-ZnO/g-C3N4 photocatalytic ozonization catalyst

A g-c3n4, ozonation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as limited applications, and achieve fast speed and reaction The effect of high activity and high mineralization rate

Inactive Publication Date: 2020-02-21
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nano-ZnO also has good catalytic activity for the ozone oxidation system, but the dissolution of Zn ions limits its application in the actual water treatment process, and the Ag 2 O-ZnO fixed on g-C 3 N 4 On the template is a way to inhibit the dissolution of metals

Method used

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  • Preparation method of Ag2O-ZnO/g-C3N4 photocatalytic ozonization catalyst
  • Preparation method of Ag2O-ZnO/g-C3N4 photocatalytic ozonization catalyst

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Embodiment 1

[0029] This application provides an Ag 2 O-ZnO / g-C 3 N 4 The preparation method of photocatalytic ozonation catalyst comprises the steps:

[0030] S1, providing a first solution, the first solution comprising Ag 2 O, ZnO, g-C 3 N 4 and dispersants, the Ag 2 O, ZnO and g-C 3 N 4 Uniformly dispersed in the first solution; the preparation of the first solution includes: g-C 3 N 4 Put the powder in 200ml dispersant, set the temperature of the ultrasonic cleaner to 20°C, ultrasonically disperse for 60min, then add AgNO 3 , after stirring at a high speed of 10000r / min for 60min, adjust the pH to 10 with 5M NaOH to obtain the first reactant, add nano-ZnO powder to the first reactant, and stir for 30min at a speed of 1000r / min , to obtain the first solution. The molar ratio of Ag+ to Zn2+ in the first solution is 1:20. Ag in the first solution 2 O-ZnO and g-C 3 N 4 The mass ratio is 1:8. The temperature of the stirring reflux is 76°C. The time of the stirring and refl...

Embodiment 2

[0036] This application provides an Ag 2 O-ZnO / g-C 3 N 4 The preparation method of photocatalytic ozonation catalyst comprises the steps:

[0037] S1, providing a first solution, the first solution comprising Ag 2 O, ZnO, g-C 3 N 4 and dispersants, the Ag 2 O, ZnO and g-C 3 N 4 Uniformly dispersed in the first solution; the preparation of the first solution includes: g-C 3 N 4 Put the powder in 200ml dispersant, set the temperature of the ultrasonic cleaner to 26°C, ultrasonically disperse for 36min, then add Ag 2 SO 4 After stirring at a high speed of 1006r / min for 46min, adjust the pH to 11 with 6M NaOH to obtain the first reactant, add nano-ZnO to the first reactant, and stir for 33min at a speed of 1003r / min, A first solution is obtained. The molar ratio of Ag+ to Zn2+ in the first solution is 1:19. Ag in the first solution 2 O-ZnO and g-C 3 N 4 The mass ratio is 1:7. The dispersant is selected from water. The temperature of the stirred reflux is 96°C. T...

Embodiment 3

[0042] see Figure 1-2 , the application provides an Ag 2 O-ZnO / g-C 3 N 4 The preparation method of photocatalytic ozonation catalyst comprises the steps:

[0043] S1, providing a first solution, the first solution comprising Ag 2 O, ZnO, g-C 3 N 4 and dispersants, the Ag 2 O, ZnO and g-C 3 N 4 Uniformly dispersed in the first solution; the preparation of the first solution includes: g-C 3 N 4 Put the powder in 200ml dispersant, set the temperature of the ultrasonic cleaner to 35°C, ultrasonically disperse for 30min, then add Ag 2 SO 4 After stirring at a high speed of 1200r / min for 45min, adjust the pH to 12 with 8M NaOH to obtain the first reactant, add nano-ZnO to the first reactant, and stir for 30min at a speed of 1200r / min, A first solution is obtained. The molar ratio of Ag+ to Zn2+ in the first solution is 1:20. Ag in the first solution 2 O-ZnO and g-C 3 N 4 The mass ratio is 1:4. The dispersant is selected ethanol. The temperature of the stirring re...

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Abstract

The invention discloses a preparation method of an Ag2O-ZnO / g-C3N4 photocatalytic ozonation catalyst. The preparation method comprises the following steps: S1, providing a first solution which comprises Ag2O, ZnO, g-C3N4 and a dispersing agent, wherein the Ag2O, the ZnO and the g-C3N4 are evenly dispersed in the first solution; S2, subjecting the first solution to stirring and refluxing so as to obtain a mixture; and S3, washing the mixture until the mixture is neutral, and carrying out drying and grinding to obtain the Ag2O-ZnO / g-C3N4 composite catalyst. According to the preparation method, melamine is used as a precursor, graphite-phase carbon nitride with a good crystal form is prepared by adopting a thermal polycondensation synthesis method, and then the Ag2O-ZnO / g-C3N4 nano-powder catalyst is synthesized by adopting a reflux method; and the method can prepare the catalyst with the highest activity and the best stability and can realize rapid and efficient photocatalytic ozonization degradation of refractory pollutants, i.e., oxalic acid (OA), in water. The catalyst has the advantages of high reaction activity, high speed, high mineralization rate and the like when being used for degrading organic pollutants in water through photocatalytic ozonation.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to an Ag 2 O-ZnO / g-C 3 N 4 Preparation method of photocatalytic ozonation catalyst. Background technique [0002] The widespread application of ozone in the field of water and wastewater treatment depends on its special chemical properties, including strong oxidation and strong selective degradation of unsaturated organic matter. Ozone oxidation technology degrades organic pollutants mainly through direct reaction (ozone reacts directly with organic matter) and indirect reaction (ozonolysis produces hydroxyl radicals ( · OH), through · The direct reaction of ozone has strong selectivity, and generally attacks the organic matter with double bond structure, while the indirect reaction has no selectivity. This technology has great prospects in the treatment of toxic and harmful pollutants, disinfection and sterilization, but there are many problems such as low ozone u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/78C02F1/30C02F101/34
CPCB01J27/24B01J23/002B01J35/004B01J35/0013C02F1/725C02F1/78C02F1/30C02F2101/34C02F2305/10
Inventor 袁向娟夏东升孙磊石函鹭殷惠芬
Owner WUHAN TEXTILE UNIV
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