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Cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst and preparation method and application thereof

A catalyst and oxide technology, applied in the field of water treatment, can solve the problems of complex preparation process, generation of organic waste liquid, and high preparation cost, and achieve the effects of enriching pore structure, promoting mineralization and improving efficiency.

Active Publication Date: 2019-04-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of high preparation cost, complex preparation process, long time-consuming, and generation of organic waste liquid of the composite metal oxide mesoporous millimeter sphere ozone oxidation catalyst in the prior art, the present invention provides a cerium titanium oxide mesoporous millimeter sphere ozone oxidation catalyst and its The preparation method and application are suitable for fixed-bed or fluidized-bed reactors with low operating costs, and have high pollutant degradation efficiency, which can significantly improve the mineralization degree of various organic pollutants in wastewater

Method used

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  • Cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst and preparation method and application thereof

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Embodiment 1

[0054] The preparation steps of cerium titanium oxide mesoporous millimeter sphere ozone catalyst in the present embodiment are as follows figure 1 Shown:

[0055] (1) Preparation of cerium titanium hydroxide: at room temperature, 7.5mmol TiOSO 4 (Titanyl sulfate) and 7.5mmol (NH 4 ) 2 Ce(NO 3 ) 6 (Ceric ammonium nitrate) was dissolved in 40mL deionized water to form a solution, then the cerium solution was added to the titanium solution and mixed, and then added together to the 120mL aqueous solution containing 14g urea to obtain the mixed aqueous solution E; at this time, the cerium in the mixed aqueous solution E The total concentration of titanium is 0.075mol / L, the concentration of urea is 1.2mol / L, and the ratio of urea concentration to the total concentration of cerium titanium (cerium element and titanium element) is 16;

[0056] Heat the aqueous solution E in a water bath at 90-95°C for 8 hours, and magnetically stir at a speed of 300rpm to precipitate cerium and...

Embodiment 2

[0065] The preparation steps of cerium titanium oxide mesoporous millimeter sphere ozone catalyst in the present embodiment are as follows figure 1 Shown:

[0066] (1) Preparation of cerium-titanium hydroxide: at room temperature, 11.25 mmol of TiOSO 4 (Titanyl sulfate) and 3.75mmol of (NH 4 ) 2 Ce(NO 3 ) 6 (Ceric ammonium nitrate) was dissolved in 40mL deionized water to form a solution, then the cerium solution was added to the titanium solution and mixed, and then added together to the 120mL aqueous solution containing 14g urea to obtain the mixed aqueous solution E; at this time, the cerium in the mixed aqueous solution E The total concentration of titanium is 0.075mol / L, the concentration of urea is 1.2mol / L, and the ratio of urea concentration to the total concentration of cerium titanium (cerium element and titanium element) is 16;

[0067] Heat the aqueous solution E in a water bath at 90-95°C for 8 hours, and magnetically stir at a speed of 300rpm to precipitate ...

Embodiment 3

[0074] The preparation steps of cerium titanium oxide mesoporous millimeter sphere ozone catalyst in the present embodiment are as follows figure 1 Shown:

[0075] (1) Preparation of cerium-titanium hydroxide: at room temperature, 3.75 mmol of TiOSO 4 (Titanyl sulfate) and 11.25mmol of (NH 4 ) 2 Ce(NO 3 ) 6 (Ceric ammonium nitrate) was dissolved in 40mL deionized water to form a solution, then the cerium solution was added to the titanium solution and mixed, and then added together to the 120mL aqueous solution containing 14g urea to obtain the mixed aqueous solution E; at this time, the cerium in the mixed aqueous solution E The total concentration of titanium is 0.075mol / L, the concentration of urea is 1.2mol / L, and the ratio of urea concentration to the total concentration of cerium titanium (cerium element and titanium element) is 16;

[0076] Heat the aqueous solution E in a water bath at 90-95°C for 8 hours, and magnetically stir at a speed of 300rpm to precipitate ...

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Abstract

The invention provides a cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst and a preparation method and an application thereof, and belongs to the technical field of water treatment. The cerium titanium oxide catalyst is a millimeter spherical particle with mesoporous structure, has high catalytic activity, excellent hydrodynamic properties, suitable pore structure, compressive mechanical strength and stability, which can significantly improve the mineralization rate of ozonation degradation of organic pollutants. The preparation method of the cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst refers to an economic preparation method suitable for cheap inorganic metal salts as raw materials, the preparation cost is greatly reduced comparing with the prior artof organometallic alkoxide process, and the preparation method of the cerium-titanium oxide mesoporous millimeter-sphere ozone catalyst is green environmental and economic. The cerium-titanium oxidemesoporous millimeter-sphere ozone catalyst can be used for catalytic ozonation treatment of wastewater in a fixed bed or a fluidized bed reactor.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a cerium-titanium oxide mesoporous millimeter sphere ozone catalyst and its preparation method and application. Background technique [0002] As the global water pollution problem is becoming more and more serious, its prevention and control are also receiving more and more attention. Wastewater must be treated in depth before discharge to meet discharge standards. Ozone oxidation water treatment technology has the advantages of simple operation, cleanness, and no sludge generation. In recent years, it has gradually become one of the important processes for advanced wastewater treatment. One type of strategy to achieve efficient ozone oxidation water treatment is to convert ozone into more hydroxyl radicals with higher reactivity and stronger oxidation ability through ozone oxidation catalysts, thereby achieving efficient degradation and mineralization of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/08B01J35/10C02F1/72C02F1/78C02F101/34C02F101/36
CPCC02F1/725C02F1/78B01J23/10C02F2101/36C02F2101/345C02F2101/34B01J35/51B01J35/40B01J35/633B01J35/615B01J35/647
Inventor 潘丙才单超周冬高冠道张炜铭吕路
Owner NANJING UNIV
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