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TiO2 column-supporting alta-mud adsorption-photocatalysis integrated process for preparation of catalysts

A technology of bentonite and photocatalysis, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of slow mineralization rate of organic matter, influence of photocatalytic effect, easy condensation of wastewater treatment, etc. Convenience, easy control, and low manufacturing cost

Inactive Publication Date: 2008-03-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using ultra-fine powder TiO 2 Wastewater treatment has the disadvantages of easy coagulation, difficult recycling, and high cost. At the same time, the absorption and blocking of light by suspended particles affects the radiation depth of light, and the concentration of organic matter and some harmful intermediate products produced by degradation is low. Compared with suspended TiO 2 Low particle contact frequency leads to slow mineralization rate of organic matter and affects photocatalytic effect

Method used

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  • TiO2 column-supporting alta-mud adsorption-photocatalysis integrated process for preparation of catalysts
  • TiO2 column-supporting alta-mud adsorption-photocatalysis integrated process for preparation of catalysts

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preparation example Construction

[0016] The preparation principle of the present invention is:

[0017] The present invention uses butyl titanate as a reaction reagent and ethanol as a solvent. Under the condition of neutral pH, butyl titanate will undergo hydrolysis and polycondensation reaction with trace moisture in the air. Its reaction equation is as follows:

[0018] The hydrolysis reaction of titanium alcoholate is Ti-OR+H 2 O→Ti-OH+R-OH

[0019] Dehydration polycondensation-Ti-OH+HO-Ti-→-Ti-O-Ti-+H 2 o

[0020] Loss of alcohol polycondensation-Ti-OR+HO-Ti-→-Ti-O-Ti-+ROH

[0021] The main component of bentonite is montmorillonite. Montmorillonite is a layered silicate mineral of 2:1 type, which belongs to the monoclinic crystal system. It is one of the most notable characteristics of bentonite. Mg present in the interlayer 2+ , Ca 2+ 、Na + 、K + 、H + , Li + etc., can replace each other under certain conditions. Generally in suspension, cations of higher concentration can exchange for catio...

Embodiment 1

[0023] The nano-titanium dioxide pillared bentonite of the present invention is a kind of porous composite material obtained by inserting nano-sized titanium dioxide particles between bentonite layers, and has the function of integrating adsorption-photocatalysis to degrade organic matter in waste water and waste gas.

[0024] The preparation method of nano titanium dioxide pillared bentonite of the present embodiment is as follows:

[0025] 1) Add butyl titanate to absolute ethanol, the molar ratio of absolute ethanol to butyl titanate is 3.6:1, stir for 1.5h, and the stirring speed is 140rpm, to form a transparent light yellow sol A, in the air Aging for 1.5h, stand-by;

[0026] 2) Take bentonite, the cation exchange capacity of the bentonite is 0.5 of the mole number of butyl titanate, after fully infiltrating with water, a suspension B of bentonite is formed, and the cation exchange capacity of the bentonite is 108mmol / 100g;

[0027] 3) Add the suspension B to the sol A a...

Embodiment 2

[0032] Example 2. The difference from Example 1 is that a group of ratios (I, II, III, IV, V) with different molar numbers of absolute ethanol and butyl titanate are tested, and the prepared titanium dioxide pillared bentonite of the present invention , see Table 2.

[0033] Table 2

[0034]

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Abstract

The present invention discloses a preparation method for absorption of an integrated photo-catalyst by TiO2 pillared bentonite. The method comprises the following steps: (1) tetrabutyl titanate is added into absolute ethanol; the molar ratio of the absolute ethanol and the tetrabutyl titanate is 1.2-6:1; the absolute ethanol and the tetrabutyl titanate are mixed form a light yellow gel A, which is aged in the air for use; (2) the bentonite is used; a cation exchange amount of the bentonite is 0.5-0.9 of the molar amount of tetrabutyl titanate; after the bentonite is fully soaked with water, a bentonite suspension B is formed; (3) the suspension B is added into the sol A, and the suspension B and the sol A are fully agitated; then the solid-liquid separation and the water-washing are conducted; the compound is dried, grinded, calcined and cooled down. The present invention is simple in the operation. Materials for the present invention can be easily got at a low price, so the manufacture cost of the present invention is low. Compared with an acid sol method, as no acid or alkali has to be added in the preparation course of the present invention, the operation is simplified and affection of inorganic ions on the catalysis performance of the catalyst.

Description

technical field [0001] The present invention relates to a kind of TiO 2 A method for preparing a pillared bentonite adsorption-photocatalysis integrated catalyst. It is a photocatalyst that can realize the integrated treatment of organic pollutants through adsorption and photocatalysis. It is mainly used for environmental treatment, such as purification treatment of waste water and indoor gas pollution. Background technique [0002] The unique advantages of advanced oxidation technology, especially photocatalytic oxidation process in the treatment and degradation of organic pollutants have attracted widespread attention. The study of high-efficiency photocatalysts has always been one of the research hotspots at home and abroad. Among many photocatalytic materials, TiO 2 As an efficient, non-toxic, stable and easy-to-use photocatalyst, it can effectively degrade organic pollutants in sewage and waste gas. It is a photocatalyst with the most potential and has broad applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/16B01D53/44
Inventor 沈学优金苏君陈侠胜
Owner ZHEJIANG UNIV
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