Preparation for catalyst of Nano titanium dioxide, and method for treating ozonized water of catalysis

A titanium dioxide and nano-scale technology, which is applied in the field of decomposing and removing toxic and harmful organic substances that are difficult to degrade, and can solve the problems that catalysts are easy to agglomerate and fail, difficult to recycle, easy to recycle, etc.

Inactive Publication Date: 2005-11-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a nanoscale titanium dioxide to solve the problems of relatively low organic matter degradation efficiency, easy agglomeration and failure of the catalyst, difficult recovery, and complicated follow-up treatment in the catalytic oxidation process of water treatment existing in the prior art. Catalyst preparation and catalytic ozonation water treatment method, the nano-scale titanium dioxide catalyst prepared by the present invention has the characteristics of not being easy to agglomerate, easy to recycle, and easy to follow-up treatment, adopting the nano-scale titanium dioxide prepared by the present invention as a catalyst for catalytic ozonation process, and using Compared with traditional large-particle titanium dioxide catalysts for catalytic ozonation, nanoscale titanium dioxide has stronger catalytic activity and reactivity for the ozonation process, and can achieve refractory organic matter under the conditions of low ozone dosage and low catalyst dosage. remove

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specific Embodiment approach 1

[0004] Specific embodiment one: the preparation method of the nano-scale titanium dioxide catalyst of this embodiment is as follows: take activated carbon as the support, and the active part is nano-scale TiO 2 , slowly dissolve tetrabutyl titanate in anhydrous ethanol solvent to obtain a sol, soak activated carbon with a particle size between 100 mesh and 10 mesh in the sol, shake at room temperature for 5 to 48 hours, and filter Then aging at 105° C. for 2 to 18 hours is the solid catalyst of this embodiment. Wash repeatedly before using the catalyst. The obtained solid catalyst is characterized by XRD and SEM, and it is found that titanium dioxide is evenly distributed on the surface of the activated carbon, the crystal form is amorphous, and the particle size is less than 10 nm. The volume ratio of tetrabutyl titanate to absolute ethanol is 1:3-5. The volume ratio of tetrabutyl titanate to absolute ethanol is 1:4. The shaking time is 24 hours. The aging time is 12 hour...

specific Embodiment approach 2

[0005] Specific embodiment two: the preparation method of the nano-scale titanium dioxide catalyst of the present embodiment is as follows: use active aluminum oxide, white silica gel, molecular sieve or zeolite as the carrier, and the active part is nano-scale TiO 2 , slowly dissolve tetrabutyl titanate in anhydrous ethanol solvent to obtain a sol, soak active aluminum oxide, white silica gel, molecular sieve or zeolite in the sol, vibrate at room temperature for 5-48 hours, filter Drying at 105° C. for 2 to 18 hours, and then sintering in a muffle furnace at 550° C. for 1 to 10 hours by temperature programming method is the solid catalyst of this embodiment. The obtained solid catalyst is characterized by XRD and SEM respectively, and it is found that the titanium dioxide is uniformly loaded, the crystal form is anatase type, and the particle size is less than 30nm. The volume ratio of tetrabutyl titanate to absolute ethanol is 1:3-5. The volume ratio of tetrabutyl titanate...

specific Embodiment approach 3

[0006] Specific embodiment three: the nanoscale titanium dioxide catalyst of the present invention exists in the form of a fluidized bed or a fixed bed in a catalytic ozonation contact reactor, and the contact time between ozone and water is 1 to 60 minutes. , The contact time of ozone is 1-50 minutes, the dosage of ozone in the catalytic ozonation contact reactor is 0.5-6.5 mg / liter of water, and the water flow speed is 1-15 m / hour. When the fluidized bed is used, the catalyst enters the reactor from the top of the reactor, and the ozone enters the reactor through the titanium plate microporous aerator, and the ozone tail gas is collected by the upper vault structure combined with the exhaust valve. When the fixed bed form is used, the ozone is fully dissolved in the water, and then an appropriate amount of saturated dissolved ozone water is directly passed into the reactor. The thickness of the catalyst layer is between 10 cm and 140 cm, and it is divided into one or more lay...

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Abstract

A process for preparing the nano-TiO2 catalyst includes slowly dissolving tetrabutyl titanate in absolute alcohol, immersing the granular activated carbon or active Al2O3 or white silica gel or molecular sieve or zeolite in it, oscillating for 5-48 hrs, filtering, and drying or ageing. It can be used to treat water by making it, ozone and water to be treated in contact for 1-50 min.

Description

Technical field: [0001] The present invention relates to the preparation technology of nanoscale titanium dioxide catalyst, and nanoscale titanium dioxide (TiO 2 ) as a catalyst in the ozone oxidation process, decomposing and removing refractory toxic and harmful organic substances in the reactor. Background technique: [0002] Ozone oxidation is a traditional water treatment technology. It was first applied in Dutch water works in 1893. It has been widely used in water treatment abroad. There are also examples of ozone applied in water treatment in China. Ozone oxidation technology uses the oxidative oxidation of ozone to decompose some easily oxidizable substances in water to achieve the purpose of decontamination. However, due to the deterioration of water quality in recent years, a large number of toxic and harmful organic pollutants that are difficult to degrade have entered the water body, among which the typical ones are pesticides, algae toxins, herbicides, humus, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06
Inventor 马军杨忆新
Owner HARBIN INST OF TECH
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