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Method for preparing TiO2/Al2O3 composite film

A technology for the preparation of composite membranes and additives, applied in chemical instruments and methods, catalyst activation/preparation, membrane technology, etc., can solve the problems of difficult to obtain membranes and porosity of membranes, so as to improve the utilization rate and increase the Good selectivity and permeate flux, chemical and physical stability

Inactive Publication Date: 2010-06-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved in the present invention is to prepare TiO by sol-gel method 2 / Al 2 o 3 For composite membranes, if the viscosity of the additive is high, it is difficult to obtain a membrane with a thin film layer and high porosity; if the viscosity of the additive is low, it is difficult to obtain a continuous film with a thin film layer and no defects such as cracks and pinholes.

Method used

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  • Method for preparing TiO2/Al2O3 composite film
  • Method for preparing TiO2/Al2O3 composite film
  • Method for preparing TiO2/Al2O3 composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] Mix 3.40g of tetrabutyl titanate and 0.46g of absolute ethanol evenly; under stirring, successively add 198ml of secondary deionized water and 0.58g of nitric acid with a concentration of 65% into the mixture, and heat up to 80°C for aging 12 hours; cool to room temperature, add 0.20 g lactic acid chitosan (0.1 wt.%) and stir evenly to obtain a translucent sol. Its composition is 1TiO 2 :1100H 2 O:0.60H + :4EtOH.

[0021] Dip-pull method is used to coat the film. α-Al 2 o 3 The carrier was immersed in the above sol for 40s, pulled out at a speed of 6 s / cm, and after drying, the temperature was raised to 450°C at a rate of 1°C / min and kept for 3 hours. Repeat the above steps 3 times to obtain TiO 2 / Al 2 o 3 Composite film.

Embodiment approach 2

[0023] Mix 3.40g of tetrabutyl titanate and 1.84g of absolute ethanol evenly; under stirring, successively add 198ml of secondary deionized water and 0.78% of nitric acid with a concentration of 65% into the mixture, and heat up to 80°C for aging for 12 hour; cooled to room temperature, added 1.01g lactic acid chitosan (0.5wt.%) and stirred evenly to obtain a translucent sol. Its composition is 1TiO 2 :1100H 2 O:0.80H + :4EtOH.

[0024] The α-Al 2 o 3 The carrier was immersed in the above sol for 60s, pulled out at a speed of 6s / cm, dried and heated to 450°C at a rate of 2°C / min for 2 hours, and the above steps were repeated 3 times to obtain TiO 2 / Al 2 o 3 Composite film.

Embodiment approach 3

[0026] Mix 2.84g of tetraisopropyl titanate and 1.84g of absolute ethanol evenly; under stirring, successively add 198ml of secondary deionized water and 0.78g of nitric acid with a concentration of 65% into the mixed solution, and heat up to 85 Aging at ℃ for 12 hours; cooling to room temperature, adding 2.01 g of chitosan oligosaccharide (1.0 wt.%) and stirring evenly to obtain a translucent sol. Its composition is 1TiO 2 :1100H 2 O:0.80H + :4EtOH.

[0027] The α-Al 2 o 3 The carrier was immersed in the above sol for 40s, pulled out at a speed of 6s / cm, dried and heated to 400°C at a rate of 1°C / min and kept for 3 hours, repeating the above steps 3 times to obtain TiO 2 / Al 2 o 3 Composite film.

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Abstract

The invention relates to a method for preparing a TiO2 / Al2O3 composite film, which takes chitosan derivative as organic additive, adopts organic titanium salt as titanium source and uses water as solvent to prepare colloidal sol. The method comprises: taking alpha-Al2O3 as carrier, and preparing the TiO2 / Al2O3 composite film by film coating, drying and calcining. The film material prepared by the method is thin in film layer, large in porosity, narrow in pore distribution, high in permeation flux and good in separating performance. Furthermore, the preparation method is simple in technique, has higher repeatability, improves the utilization rate of raw materials, is beneficial to reducing the cost and is suitable for industrial amplification.

Description

technical field [0001] The invention relates to a method for preparing an oxide film, in particular, a method for preparing TiO 2 / Al 2 o 3 Composite membrane method. Background technique [0002] Since metal oxides play an important role in catalysis, catalyst support, microelectronics, photocatalysis and other fields, the preparation of metal oxides with controllable morphology and surface properties has attracted extensive attention. Among them, the synthesis of titanium dioxide has attracted special attention. As a photocatalyst, titanium dioxide has the advantages of being cheap, non-toxic, and stable in aqueous phase. However, the use of suspended titanium dioxide as a catalyst has problems such as easy loss and difficult recovery. Anderson et al. tried to immobilize titanium dioxide with a carrier. The results show that the supported titanium dioxide interacts with the specific functional groups in the carrier, and is firmly bonded to the carrier with a low deso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01J21/06B01J32/00B01J37/00
Inventor 黄伟王晓东石芳
Owner TAIYUAN UNIV OF TECH
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