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Process for preparing nano titanium dioxide bentonite composite material

A technology of nano-titanium dioxide and composite materials, which is applied in the field of preparation of catalytic materials, can solve the problems of low concentration of bentonite suspension, limitation of industrialization degree, and destruction of bentonite structure, and achieves remarkable adsorption and catalytic effects, simple and easy preparation process, and easy material extraction. easy effect

Inactive Publication Date: 2005-10-19
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first method, because the reaction is carried out under harsh acidic conditions, can easily cause damage to the bentonite structure and easily corrode equipment; although the second method has mild reaction conditions, its raw materials are relatively expensive and the reaction process is difficult to control
The most important thing is that both methods require the bentonite suspension concentration to be extremely low (below 2wt%), and the calcining program temperature rise and atmosphere are strict, which limits the realization of industrialization.

Method used

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  • Process for preparing nano titanium dioxide bentonite composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 100g of refined sodium-based bentonite to 9 times of distilled water to swell, shear at high speed for 20 minutes, add 0.1g of sodium silicate to modify and prepare 10wt% bentonite suspension, and set aside; 10ml of TiCl 4 Transfer to 100ml of absolute ethanol, fully stir for 1 hour, then age for 5 hours, then add to 200ml of a mixed solution of glycerol and water with a volume ratio of 1:1, stir for 2.5 hours, then age for 24 hours, mix the aging solution with 200ml of 10wt% bentonite suspension was mixed and fully stirred for half an hour, then moved into a polytetrafluoroethylene-lined autoclave, heated to 100°C, and kept at a constant temperature for 11 hours. After cooling, the resulting slurry was washed with deionized water until it was free of Cl - , Dry at 60°C and grind to obtain the nano-titanium dioxide bentonite composite material of the present invention.

[0018] Depend on figure 1 It can be seen that the diffraction angles 2θ corresponding to both d...

Embodiment 2

[0020] Add 100g of refined calcium-based bentonite to 4 times of distilled water to swell and shear at high speed for 20 minutes, add 0.5g of sodium dodecylbenzenesulfonate to modify and prepare a 20wt% bentonite suspension, and set aside; 10ml of TiCl 4 Transfer to 100ml of absolute ethanol, stir well for 1 hour, then age for 5 hours, then add to 150ml of a mixed solution of ethylene glycol and water with a volume ratio of 2:1, stir for 3 hours, then age for 48 hours, mix the aging solution with 100ml of 20wt% bentonite suspension was mixed and fully stirred for half an hour, then moved into a polytetrafluoroethylene-lined autoclave, heated to 120°C, kept at a constant temperature for 10 hours, and the slurry obtained after cooling was washed with deionized water until it was free of Cl - , dried at 80°C and then ground to obtain the nano-titanium dioxide bentonite composite material of the present invention.

Embodiment 3

[0022] Weigh 0.1 g of the catalyst prepared in Example 1 and put it into 50 ml of 20 g / l methyl orange solution. After ultrasonic dispersion, the decolorization rate is 100% after standing for 1 hour under sunlight with an average sunlight intensity of 7654 lux.

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Abstract

The preparation process of nano composite titania / bentonite material includes the following steps: 1) adding water into sodium base or calcium base bentonite for expanding and shearing at high speed to obtain bentonite suspension; 2) adding TiCl2 into anhydrous alcohol via stirring and ageing to prepare transparent solution A; 3) dropping solution A into the mixed solution of glycerin and water in certain volume ratio via stirring and ageing to prepare transparent solution B; and 4) dropping bentonite suspension in certain amount into solution B while stirring, reacting inside one high pressure reactor with PTFE lining at 80-200 deg.c for 1-15 hr, washing the discharged product until no Cl ion and drying. The process is simple, practical and suitable for industrial production, and the product is a excellent photocatalyst.

Description

technical field [0001] The invention relates to a preparation method of a catalytic material, in particular to a hydrothermal preparation method of a nano titanium dioxide bentonite composite material. Background technique [0002] Nano-titanium dioxide bentonite composites have been widely used in catalytic reactions due to their good microporous structure and high thermal stability. In recent years, they have become a hot spot in the research of mineral materials at home and abroad. Nano-titanium dioxide bentonite composite material is a micro / mesoporous composite material obtained by introducing titanium dioxide precursors into clay sheets by ion exchange. It is characterized by porosity, large specific surface area, small interlayer titanium dioxide particles, and more Strong solid acid properties, etc., can be used as adsorbents, photocatalysts, and shape-selective solid acid catalysts in the fields of alkyl substitution, dehydrogenation, dehydration, esterification, an...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/20B01J21/06B01J21/16B01J37/00
Inventor 曲济方毛树红
Owner SHANXI UNIV
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