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Cerium-based ozone catalyst containing double active sites as well as preparation method and application thereof

A catalyst and dual-activity technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as narrow pH range, low organic mineralization performance, and easy loss of active components. Achieve the effect of small size, promote cracking and decarboxylation mineralization, and good mineralization enhancement effect

Pending Publication Date: 2020-05-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low organic matter mineralization performance, narrow pH application range, easy loss of catalyst active components in acidic conditions, poor reusability and other problems in current heterogeneous catalysts, and provide a catalyst containing dual active sites. The cerium-based heterogeneous ozone catalyst and its preparation method, and its application in the field of catalytic ozone to remove pollutants

Method used

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  • Cerium-based ozone catalyst containing double active sites as well as preparation method and application thereof
  • Cerium-based ozone catalyst containing double active sites as well as preparation method and application thereof
  • Cerium-based ozone catalyst containing double active sites as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Ce-g-C 3 N 4 Catalyst preparation:

[0043] Melamine powder was dissolved in 100mL boiling water to make a melamine solution with a concentration of 0.5mol / L; 1.0gCe(NO 3 ) 3 ·6H 2 O powder was added to the melamine solution with a concentration of 0.5mol / L, then 15g of gluconic acid and 5mL of 37wt% hydrochloric acid were added, and mechanically stirred in a constant temperature water bath at 100°C for 30min; the mixture obtained after mechanical stirring was dried at 60°C for 8h; The final solid was calcined at 450 °C for 1 h in a tube furnace with a nitrogen flow rate of 50 mL / min to obtain Ce-g-C 3 N 4 The catalyst material is named Ce-CN-1. Its TEM image is shown in figure 1 , the catalyst is a layered stacked structure with a size of about 100nm.

Embodiment 2

[0045] Ce-g-C 3 N 4 Catalyst preparation:

[0046] Melamine powder was dissolved in 100mL boiling water to make a melamine solution with a concentration of 5mol / L; 0.1gCe(NO 3 ) 3 ·6H 2 O powder was added to the melamine solution with a concentration of 5mol / L, then 10g of ascorbic acid and 5mL of 37wt% hydrochloric acid were added, and mechanically stirred in a constant temperature water bath at 100°C for 30min; the mixture obtained after mechanical stirring was dried at 100°C for 12h; after drying, the solid Calcined at 500 °C for 2 h in a tube furnace with a nitrogen flow rate of 100 mL / min to obtain Ce-g-C 3 N 4 The catalyst material is named Ce-CN-2.

Embodiment 3

[0048] Ce-g-C 3 N 4 Catalyst preparation:

[0049] Melamine powder was dissolved in 100mL boiling water to make a melamine solution with a concentration of 2mol / L; 0.5gCe(NO 3 ) 3 ·6H 2 O powder was added to the melamine solution with a concentration of 2mol / L, then 20g of citric acid and 5mL of 37wt% hydrochloric acid were added, and mechanically stirred in a constant temperature water bath at 100°C for 30min; the mixture obtained after mechanical stirring was dried at 80°C for 10h; after drying The solid was calcined at 550 °C for 1.5 h in a tube furnace with a nitrogen flow rate of 150 mL / min to obtain Ce-g-C 3 N 4 The catalyst material is named Ce-CN-3.

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Abstract

The invention relates to a cerium-based ozone catalyst containing double active sites as well as a preparation method and application thereof, and belongs to the technical field of advanced wastewatertreatment and environmental catalysis. The preparation method of the cerium-based ozone catalyst comprises the following steps: 1) preparing a melamine solution; 2) adding cerium salt into the melamine solution in the step 1), then adding a polyhydroxyl carboxylic acid auxiliary agent and hydrochloric acid, and stirring to obtain a mixture; and 3) drying the mixture, and calcining to obtain a Ce-g-C3N4 catalyst, which is used for degrading organic pollutants in wastewater. Compared with the prior art, the Ce-g-C3N4 catalyst has the advantages that the preparation process is simple, the raw materials are cheap and easy to obtain, and the Ce-g-C3N4 catalyst is insoluble in acid, alkali and an organic solvent, has high catalytic activity and stability, low dosage, a wide pH application rangeand good reusability, has a good mineralization promotion effect on various refractory organic pollutants, and has a wide prospect in advanced treatment of industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater advanced treatment and environmental catalysis, and relates to a Ce-g-C containing double active sites 3 N 4 Ozone catalyst and its preparation method and application. Background technique [0002] Industrial wastewater has always been an important problem in environmental pollution control in my country. Because most of the organic pollutants in industrial wastewater have the characteristics of biological toxicity, complex structure and stability, conventional biological treatment is not enough to achieve standard treatment of wastewater. As an important representative of advanced oxidation technology, ozone oxidation technology has received extensive attention in the field of industrial wastewater treatment due to its strong oxidation effect and simple process application process. Catalytic ozone oxidation technology aims to use catalysts to promote the decomposition process of ozone, promo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C02F1/78C02F101/30
CPCB01J27/24B01J37/082C02F1/725C02F1/78C02F2101/30C02F2305/023
Inventor 吴德礼田时雨彭澍晗张亚雷
Owner TONGJI UNIV
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