Millimeter level mesoporous ozone oxidation catalyst and preparation and application method thereof

A technology of ozone oxidation and catalyst, which is applied in the field of water treatment, can solve the problems of low catalytic efficiency and poor fluid mechanical properties, and achieve the effects of high degradation efficiency, improved mineralization degree, and good catalytic activity

Active Publication Date: 2017-07-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems of poor hydrodynamic properties and low catalytic efficiency of existing ozone oxidation catalysts in wastewater treatment, the present invention provides a millimeter-scale mesoporous ozone oxidation catalyst and its preparation and application methods

Method used

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  • Millimeter level mesoporous ozone oxidation catalyst and preparation and application method thereof
  • Millimeter level mesoporous ozone oxidation catalyst and preparation and application method thereof
  • Millimeter level mesoporous ozone oxidation catalyst and preparation and application method thereof

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Embodiment 1

[0049] Preparation and Characterization of Millimeter Mesoporous Ozone Oxidation Catalysts

[0050] (1) Preparation of calcium alginate gel template spheres: at room temperature, use a syringe with a needle inner diameter of 0.41 mm to inject 0.27 mol / L CaCl 2 Add sodium alginate aqueous solution with a mass fraction of 1.0% to the aqueous solution dropwise, use a syringe pump to control the injection flow at 4.5mL / h, form gel balls and continue stirring for 24 hours, and wash with water to obtain calcium alginate gel template balls;

[0051] (2) Preparation of titanium-zirconium composite oxide spheres: After washing the calcium alginate gel template spheres prepared in step (1) with absolute ethanol, they were soaked in the titanium-zirconium alkoxide mixed solution for 24 hours, and then transferred to Soak in isopropanol aqueous solution for 12 hours, take it out, dry at room temperature for 48 hours, dry at 60°C for 6 hours, then calcinate at 500°C for 5 hours, cool to ro...

Embodiment 2

[0059] Preparation and Characterization of Millimeter Mesoporous Ozone Oxidation Catalysts

[0060](1) Preparation of calcium alginate gel template spheres: at room temperature, use a syringe with a needle inner diameter of 0.25 mm to inject 0.27 mol / L CaCl 2 Add sodium alginate aqueous solution with a mass fraction of 1.0% to the aqueous solution dropwise, use a syringe pump to control the injection flow at 4.5mL / h, form gel balls and continue stirring for 12 hours, and wash with water to obtain calcium alginate gel template balls;

[0061] (2) Preparation of titanium-zirconium composite oxide spheres: After washing the calcium alginate gel template spheres prepared in step (1) with absolute ethanol, they were soaked in the titanium-zirconium alkoxide mixed solution for 12 hours, and then transferred to Soak in isopropanol aqueous solution for 24 hours, take it out and dry at room temperature for 24 hours, dry at 65°C for 4 hours, then calcinate at 350°C for 8 hours, cool to ...

Embodiment 3

[0066] Preparation and Characterization of Millimeter Mesoporous Ozone Oxidation Catalysts

[0067] (1) Preparation of calcium alginate gel template spheres: at room temperature, use a syringe with a needle inner diameter of 0.69 mm to inject 0.27 mol / L CaCl 2 Add sodium alginate aqueous solution with a mass fraction of 1.0% to the aqueous solution dropwise, use a syringe pump to control the injection flow at 4.5mL / h, form gel balls and continue stirring for 18 hours, and wash with water to obtain calcium alginate gel template balls;

[0068] (2) Preparation of titanium-zirconium composite oxide spheres: After washing the calcium alginate gel template spheres prepared in step (1) with absolute ethanol, they were soaked in the titanium-zirconium alkoxide mixed solution for 18 hours, and then transferred to Soak in isopropanol aqueous solution for 18 hours, take it out, dry at room temperature for 72 hours, dry at 55°C for 8 hours, then calcinate at 600°C for 3 hours, cool to ro...

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Abstract

The invention discloses a millimeter level mesoporous ozone oxidation catalyst and preparation and an application method thereof, belongs to the technical field of water processing, and aims to solve the problems that the hydrodynamic performance of a conventional ozone oxidation catalyst is bad, the catalytic efficiency is low, and the stability is insufficient. The millimeter level mesoporous ozone oxidation catalyst comprises cerium, titanium, zirconium, and oxygen, is a millimeter level mesoporous spherical particle, has a unique crystal structure, at the same time, has the advantages of durable and stable catalytic activity, excellent hydrodynamic characteristics and pore structure, high compression strength, acid/alkali resistance, ligand stability, oxidation resistance, and thermal stability, and can prominently improve the mineralization degree of ozone oxidation. The valence composition of active components is not changed after repeated use. The preparation method comprises the following steps: preparing millimeter level mesoporous titanium-zirconium composite microspheres by a calcium alginate template method, and then combining cerium and the titanium-zirconium compound by an impregnation method. The provided catalyst can be applied to fixed bed reactor/fluidized bed reactor wastewater treatment, and can be thermally regenerated when pollutants are accumulated on the catalyst.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a millimeter-scale mesoporous ozone oxidation catalyst and its preparation and application method. Background technique [0002] With the increasing concern about water pollution today, more and more attention has been paid to water pollution control. Wastewater must be treated in depth before discharge to meet discharge standards. Ozone oxidation technology is now increasingly widely used at the end of wastewater treatment for deep degradation of organic pollutants in wastewater, especially for refractory biodegradable organic matter has become a preferred process. However, the common problem of low mineralization degree of pollutants in ozone oxidation is not only unfavorable to the standard of chemical oxygen demand (COD), but also the intermediate products produced by the incomplete degradation of some organic matter may have higher toxicity, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/04B01J23/10B01J35/08B01J35/10C02F1/78
CPCC02F1/725C02F1/78B01J21/06B01J23/002B01J35/08B01J35/1019B01J35/1038B01J35/1061B01J2523/00B01J2523/48B01J2523/47B01J2523/3712B01J2523/23C02F2101/34C02F2303/16B01J21/066B01J23/10B01J35/023B01J37/0201B01J37/0236B01J37/088B01J21/20B01J23/92B01J38/12B01J35/026B01J37/0018B01J37/009B01J37/0213B01J37/06B01J37/10B01J38/02B01J38/48C01F17/30C01P2002/01C01P2002/90
Inventor 潘丙才单超许友杨志超张炜铭吕路
Owner NANJING UNIV
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