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Method for preparing ZnO/g-C3N4 ozone composite catalyst and application

A composite catalyst and ozone technology, which is applied in the field of water pollution control, can solve the problems of catalyst activity reduction and achieve the effects of accelerated degradation and removal, large specific surface area and good stability

Active Publication Date: 2017-05-31
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional metal ozone catalysts have metal ions eluted after the reaction, resulting in a decrease in catalyst activity. Therefore, exploring new composite catalysts to improve catalyst activity and stability is a key issue in catalytic ozone oxidation.

Method used

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  • Method for preparing ZnO/g-C3N4 ozone composite catalyst and application
  • Method for preparing ZnO/g-C3N4 ozone composite catalyst and application
  • Method for preparing ZnO/g-C3N4 ozone composite catalyst and application

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preparation example Construction

[0033] Such as figure 1 Shown, the embodiment of the present invention ZnO / g-C 3 N 4 The preparation method of ozone composite catalyst, described method comprises the steps:

[0034] Provide a first solution, the first solution includes ZnO, g-C 3 N 4 And dispersant, the ZnO and g-C 3 N 4 uniformly dispersed in the first solution;

[0035] stirring and evaporating the first solution to dryness, removing the dispersant in the first solution to obtain a mixture;

[0036] The mixture is dried, ground, and calcined at high temperature to obtain ZnO / g-C 3 N 4 Ozone composite catalyst.

[0037] Graphite carbon nitride (g-C 3 N 4) is an allotrope of carbon nitride, which has a unique graphite-like layered stacking structure and sp2 hybridized π-conjugated electronic band structure. Because it has a certain absorption for visible light, it also has strong mechanical properties, With the advantages of good thermal stability, acid and alkali corrosion resistance, and easy p...

Embodiment 1

[0045] g-C 3 N 4 preparation of

[0046] Weigh a certain amount of melamine into a crucible, put the crucible into a muffle furnace, and bake it at a heating rate of 5°C / min at 550°C for 2 hours, and take it out after the crucible is cooled to obtain light yellow powder g-C 3 N 4 , grind and set aside.

[0047] ZnO / g-C 3 N 4 preparation of

[0048] Weigh 5.4g g-C 3 N 4 Put the powder in 50ml of absolute ethanol, set the temperature of the ultrasonic cleaner to 30°C, and ultrasonically stir at a speed of 250-300r / min for 30min, then weigh 0.6g of ZnO and mix it in, and ultrasonically stir for 30min under the same conditions , heat the uniformly dispersed sample in a water bath at 80°C, and stir it at a speed of 300-350r / min. Drying, grinding, and finally putting it into a muffle furnace, calcining at 650°C for 2 hours at a heating rate of 3°C / min, and then grinding to obtain the required ZnO / g-C 3 N 4 Ozone composite catalyst.

[0049] ZnO / g-C prepared by Example 1 ...

Embodiment 2

[0053] g-C 3 N 4 preparation of

[0054] Weigh a certain amount of melamine into a crucible, put the crucible into a muffle furnace, and bake it at 500°C for 4 hours at a heating rate of 5°C / min, and take it out after the crucible is cooled to obtain light yellow powder g-C 3 N 4 , grind and set aside.

[0055] ZnO / g-C 3 N 4 preparation of

[0056] Weigh 5.4g g-C 3 N 4 Put the powder in 50ml of anhydrous methanol, set the temperature of the ultrasonic cleaner to 30°C, and perform ultrasonic stirring at a speed of 250-300r / min for 40min, then weigh 0.54g of ZnO and mix it in, and ultrasonically for 30min under the same conditions. Heat the uniformly dispersed sample in a water bath at 70°C and stir at a speed of 300-350r / min. After the anhydrous methanol is evaporated to dryness, put the sample into an electric constant temperature blast drying oven and dry it at 60°C. Dry, grind, and finally put it into a muffle furnace, calcinate at 650°C for 2 hours at a heating rat...

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Abstract

The invention provides a method for preparing a ZnO / g-C3N4 ozone composite catalyst and application. The method comprises the following steps: providing a first solution, wherein the first solution comprises ZnO, g-C3N4 and a dispersing agent; the ZnO and the g-C3N4 are uniformly dispersed in the first solution; performing stirring evaporation to dry the first solution, and removing the dispersing agent in the first solution so as to obtain a mixture; drying the mixture, grinding, and performing high-temperature calcinations, thereby obtaining the ZnO / g-C3N4 ozone composite catalyst. The ZnO / g-C3N4 ozone composite catalyst prepared by using the method can be used for catalyzing ozone oxidization organic pollutants; as the ZnO / g-C3N4 ozone composite material is applied to the ozone catalysis process, dissolution of metal ions after reaction of a conventional metal ozone catalyst can be effectively reduced, and reaction activity and stability of the catalyst can be improved.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, in particular to a ZnO / g-C 3 N 4 Preparation method and application of ozone composite catalyst. Background technique [0002] With the increasing population, the demand for artificially synthesized pesticides is increasing, and a large number of pesticides are produced, sold and used to resist pests and diseases, weed control and promote crop growth. Atrazine, also known as atrazine (ATZ), is a herbicide with moderate to low toxicity and has been widely used all over the world. According to statistics, in 2007, my country's demand for atrazine was over 5,000 tons. Since most pesticides have moderate environmental persistence, long-term and large-scale use of pesticides will cause micro-pollution of environmental water bodies. In recent years, incidents of ATZ detection in surface water and drinking water have been continuously reported. Existing studies have proved that ATZ c...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08C02F1/78C02F101/36C02F101/38
CPCB01J27/24B01J37/08C02F1/725C02F1/78C02F2101/36C02F2101/38C02F2305/023
Inventor 袁向娟夏东升段书乐孙磊李东亚徐海明曹刚
Owner WUHAN TEXTILE UNIV
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