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Preparing method of nanometer titania composite membrane for photocatalysis

A technology of nano-titanium dioxide and titanium dioxide, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems that do not involve the bonding force and thickness uniformity of titanium dioxide films, and achieve improved bonding force and simplification. The effect of the preparation process

Inactive Publication Date: 2005-02-23
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, none of the above methods involves the influence of the preparation technology of the titanium dioxide film on the bonding force and thickness uniformity.

Method used

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  • Preparing method of nanometer titania composite membrane for photocatalysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 100 g of butyl titanate + 40 g of isopropanol + 1000 g of an aqueous solution containing 2 wt % polyethylene glycol with a molecular weight of 1500 + 1000 g of distilled water + 2.8 g of an aqueous solution containing 67 wt % nitric acid are added to a container for mixing, stirring and hydrolysis to obtain titanium dioxide colloidal solution. Add 1000 g of the above titanium dioxide colloidal solution to 130 g of titanium dioxide powder with a particle size of 40 nm, and grind for 30 minutes to prepare a composite slurry of nanometer titanium dioxide powder and colloid. The composite slurry is uniformly coated on the glass, dried at 40°C, and sintered at a high temperature of 510°C for 30 minutes to obtain a nano-titanium dioxide film. Test the bonding strength of the film and glass, see Table 1 for details.

Embodiment 2

[0023] Example 2: 120g of butyl titanate + 50g of isopropanol + 1000g of an aqueous solution containing 2wt% polyethylene glycol with a molecular weight of 5000 + 800g of distilled water + 3g of an aqueous solution containing 67wt% nitric acid were added to a container for mixing, stirring and hydrolysis to prepare titanium dioxide colloid solution. Add 1000 g of the above titanium dioxide colloidal solution to 120 g of titanium dioxide powder with a particle size of 30 nm, and grind for 30 minutes to prepare a composite slurry of nanometer titanium dioxide powder and colloid. The composite slurry is uniformly coated on the glass, dried at 50° C., and sintered at a high temperature of 550° C. for 30 minutes to obtain a nano-titanium dioxide film. Test the bonding strength of the film and glass, see Table 1 for details.

Embodiment 3

[0024] Example 3: 150g of butyl titanate + 60g of isopropanol + 1000g of an aqueous solution containing 2wt% polyethylene glycol with a molecular weight of 10000 + 500g of distilled water + 4g of an aqueous solution containing 67wt% nitric acid were added to a container for mixing, stirring and hydrolysis to prepare titanium dioxide colloid solution. Add 1000 g of the above titanium dioxide colloidal solution to 110 g of titanium dioxide powder with a particle size of 20 nm, and grind for 45 minutes to prepare a composite slurry of nanometer titanium dioxide powder and colloid. The composite slurry is evenly coated on the glass, dried at 85°C, and sintered at a high temperature of 500°C for 120 minutes to obtain a nano-titanium dioxide film. Test the bonding strength of the film and glass, see Table 1 for details.

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Abstract

A composite nano-TiO2 membrane for photocatalysis is prepared through proportionally ixing tetrbutyl titanate with isopropanol, polyethanediol, distilled water and the aqueous solution of nitric acid while stirring, stirring at 50-80 deg.c, hydrolyzing to obtain TiO2 sol, adding nano-TiO2, grinding, coating the slurry on glass or glass fibres, drying and calcining.

Description

1. Technical field [0001] The invention relates to a method for preparing a photocatalytic nano-titanium dioxide composite film, belonging to the field of photocatalytic nano-titanium dioxide composite film preparation. 2. Background technology [0002] TiO 2 It is an n-type semiconductor with a wide band gap. When absorbing light with an energy greater than 400nm, electrons transition from the valence band to the conduction band, thereby effectively generating electron-hole pairs. TiO 2 After being made into nanoparticles, due to the quantum size effect caused by particle size reduction and the surface area increases by several orders of magnitude due to particle size reduction, nano-titanium dioxide exhibits special optical and electrical properties different from the bulk. But TiO 2 Only the ultraviolet region that can absorb sunlight limits its application in the field of photocatalysis. [0003] Gratzel's paper published in "NATURE" in 1991 first proposed a sensitiz...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J37/02
Inventor 涂铭旌阎康平鲁厚芳周成锡淦
Owner SICHUAN UNIV