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Nano silver-titanium dioxide loaded porous cordierite foamed ceramic catalyst and preparation

A technology of titanium dioxide and foam ceramics, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, alkali metal oxides/hydroxides, etc., to improve photocatalytic efficiency, large adsorption capacity, The effect of a large contact area

Inactive Publication Date: 2012-07-25
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it still maintains the adsorption capacity and photocatalytic capacity after multiple uses

Method used

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  • Nano silver-titanium dioxide loaded porous cordierite foamed ceramic catalyst and preparation
  • Nano silver-titanium dioxide loaded porous cordierite foamed ceramic catalyst and preparation
  • Nano silver-titanium dioxide loaded porous cordierite foamed ceramic catalyst and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method and preparation steps of the nano-silver-titania supported porous cordierite foam ceramic catalyst are:

[0019] (1) Disperse the purchased P25 titanium dioxide in water, the concentration of titanium dioxide is 1000 mg / L, and sonicate for 5 minutes. In the titanium dioxide suspension, Ag:Ti atomic molar ratio is 1:20, add silver nitrate, and stir for 30 minutes , finally add the sodium borohydride of the same molar amount as silver nitrate in the above-mentioned mixed solution, and adjust the pH value of the solution to 10.0 with ammonia, filter, wash and dry after stirring for 30 minutes, and finally obtain nano-silver-titanium dioxide particles;

[0020] (2) Add 500 mg of nano-silver-titanium dioxide particles into 1 liter of water, and stir until the nano-silver-titanium dioxide particles are uniformly dispersed in the water to obtain a nano-silver-titanium dioxide suspension with a concentration of 500 mg / L;

[0021] (3) Immerse the cordier...

Embodiment 2

[0024] The preparation method and preparation steps of the nano-silver-titania supported porous cordierite foam ceramic catalyst are:

[0025] (1) Disperse the purchased P25 titanium dioxide in water, the concentration of titanium dioxide is 1000 mg / L, and sonicate for 5 minutes. In the titanium dioxide suspension, Ag:Ti atomic molar ratio is 1:20, add silver nitrate, and stir for 30 minutes , finally add the sodium borohydride of the same molar amount as silver nitrate in the above-mentioned mixed solution, and adjust the pH value of the solution to 10.0 with ammonia, filter, wash and dry after stirring for 30 minutes, and finally obtain nano-silver-titanium dioxide particles;

[0026] (2) Add 500 mg of nano-silver-titanium dioxide particles into 1 liter of water, and stir until the nano-silver-titanium dioxide particles are uniformly dispersed in the water to obtain a nano-silver-titanium dioxide suspension with a concentration of 500 mg / L;

[0027] (3) Immerse the cordier...

Embodiment 3

[0030] The preparation method and preparation steps of the nano-silver-titania supported porous cordierite foam ceramic catalyst are:

[0031] (1) Disperse the purchased P25 titanium dioxide in water, the concentration of titanium dioxide is 1000 mg / L, and sonicate for 5 minutes. In the titanium dioxide suspension, Ag:Ti atomic molar ratio is 1:20, add silver nitrate, and stir for 30 minutes , finally add the sodium borohydride of the same molar amount as silver nitrate in the above-mentioned mixed solution, and adjust the pH value of the solution to 10.0 with ammonia, filter, wash and dry after stirring for 30 minutes, and finally obtain nano-silver-titanium dioxide particles;

[0032] (2) Add 500 mg of nano-silver-titanium dioxide particles into 1 liter of water, and stir until the nano-silver-titanium dioxide particles are uniformly dispersed in the water to obtain a nano-silver-titanium dioxide suspension with a concentration of 500 mg / L;

[0033] (3) Immerse the cordierit...

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Abstract

The invention discloses a nano silver-titanium dioxide loaded cordierite foamed ceramic catalyst used for sewage purification. The catalyst is composed of cordierite foamed ceramic of a porous three-dimensional reticulated frame structure and nano silver particles-titanium dioxide particles; the catalyst has larger contact area and higher adsorptive capacity; and the catalyst is characterized in that the porosity of the cordierite foamed ceramic is 80-88%, the nano silver particles-titanium dioxide (Ag / TiO2) accounts for 7-11% the mass of the cordierite foamed ceramics catalyst, and the mass ratio of nano silver particles (Ag) to titanium dioxide (TiO2) is 1.02%. The catalyst is prepared by the three steps of: (1) preparing nano silver-titanium dioxide particles; (2) preparing a suspension of the nano silver-titanium dioxide particles; and (3) loading on the cordierite foamed ceramic. When the catalyst is used for adsorbing and degrading pollutants in water, by testing the purified sewage, the removal rate of estrogen ethinyl estradiol (EE2) is 91.7% and inactivation rate of Escherichia coli is 99%, so that a significant effect is obtained.

Description

technical field [0001] The invention relates to a highly efficient porous catalyst for removing organic pollutants and pathogenic microorganisms in water. Compared with a titanium dioxide-supported planar body, the cordierite foam ceramic has a larger contact area and adsorption capacity, thereby removing organic pollutants and Enhanced photocatalytic efficiency of supported titania when pathogenic microorganisms are present. The supported catalyst can be used to adsorb and degrade pollutants in water, and belongs to the technical fields of catalytic materials, environmental pollution control and environmental protection. Background technique [0002] In recent years, the shortage of water resources caused by population growth and economic development has become a problem that everyone is concerned about. However, the reuse of sewage has become an important way to solve or alleviate the above problems. However, difficult-to-remove pollutants and emerging pollutants in reus...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J35/10B01J20/10B01J20/28A01N59/16A01P1/00C02F1/32C02F1/28C02F1/50
Inventor 毛凯张文龙王大伟李轶
Owner HOHAI UNIV
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