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Method for preparing TiO2 fixed film photocatalyst loaded on glass fiber net

A technology of glass fiber mesh and photocatalyst, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problem of stability, specific surface area, firmness and convenience of loading, which cannot meet the requirements of photocatalytic oxidation, degradation and dissolution The actual application requirements of sexual organic pollutants, the preparation method is not suitable for industrialized large-scale production, and the use of external light sources is unfavorable, so as to achieve good application prospects, high economic and practical value, and simplified structure.

Inactive Publication Date: 2006-01-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of reactor has disadvantages such as large power consumption, high requirements for the firmness of the load, separation in practical applications, and the scattering of light by particles is not conducive to the use of external light sources.
In contrast, TiO in the form of a film 2 Fixed on various flat substrates, such as glass plates, steel plates, aluminum plates, non-woven fabrics, etc. Although the fixed film prepared by this method does not need to separate the catalyst in actual use, the power consumption is small, and the external light source There is no limit to the use of the catalyst and it is recognized as the most practical catalyst. However, due to the relatively small specific surface area and mass transfer limitations, the reaction efficiency is affected, and the preparation method of the membrane is not suitable for industrial production. The substrate used The stability of the properties, the specific surface area, the firmness of the load, and the convenience of loading in the reactor cannot meet the practical application requirements of photocatalytic oxidation degradation of dissolved organic pollutants.

Method used

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  • Method for preparing TiO2 fixed film photocatalyst loaded on glass fiber net

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Experimental program
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Effect test

Embodiment 1

[0022] The butyl titanate, absolute ethanol and concentrated nitric acid used in the present invention are commercially available and analytically pure. The specifications of the flexible base material glass fiber mesh are: Si content ≥ 96%, mesh size 1.5×1.5mm. Pretreatment of glass fiber mesh: put the glass fiber mesh directly into the muffle furnace, raise the temperature to 500°C at a rate of 2-4°C / min, then keep at this temperature for 0.5-1 hour, and cool naturally.

[0023] Preparation of sol-gel solution: 80ml tetra-n-butyl titanate T I (C 4 h 9 O) 4 Uniformly mix with 300-400ml absolute ethanol to form A liquid; uniformly mix 200-350ml absolute ethanol, 8ml water and 1-3ml nitric acid (concentration 1:4) to form B liquid; Slowly add liquid B into liquid A, and continue to stir vigorously for 30-60 minutes to form a transparent sol; finally let stand and age for 24-48 hours to form a gel for later use.

[0024] Membrane coating: immerse the glass fiber net in the ...

Embodiment 2

[0029] Pretreatment of glass fiber mesh: wash the glass fiber mesh with detergent to remove surface dirt, and then rinse with tap water; soak the fiber mesh with absolute ethanol for 3-5 minutes to remove fine debris on the mesh; wash repeatedly with distilled water 3-5 times; put it into a muffle furnace, raise the temperature to 300°C at a heating rate of 5-7°C / min, then keep at this temperature for 1-2 hours, and cool naturally.

[0030] Preparation of sol-gel solution: Mix 80ml of tetra-n-butyl titanate and 300-400ml of absolute ethanol evenly to form liquid A; mix 200-400ml of absolute ethanol, 8ml of water and 3-5ml of nitric acid (1:4) Mix to form liquid B; under the condition of vigorous stirring, slowly add liquid B to liquid A, and continue to stir vigorously for 30-60 minutes to form a transparent sol; finally stand and age for 24-72 hours to form a gel spare.

[0031] Membrane coating: immerse the glass fiber mesh in the glue solution for 2 to 3 minutes, lift the ...

Embodiment 3

[0036] Pretreatment of glass fiber mesh: wash the glass fiber mesh with detergent to remove surface dirt, and then rinse with tap water; soak the fiber mesh with absolute ethanol for 2-3 minutes to remove fine debris on the mesh; wash repeatedly with distilled water 3-4 times; put it into a muffle furnace, raise the temperature to 500°C at a rate of 3-5°C / min, then keep at 500°C for 1-2 hours, and cool naturally.

[0037] Preparation of sol-gel solution: uniformly mix 80ml tetra-n-butyl titanate with 300-400ml absolute ethanol to form liquid A; mix 250-350ml absolute ethanol, 8ml water and 6-8ml nitric acid (1:4) Mix to form liquid B; under the condition of vigorous stirring, slowly add liquid B to liquid A, and continue to stir vigorously for 60-90 minutes to form a transparent sol; finally stand and age for 12-24 hours to form a gel spare.

[0038] Membrane coating: immerse the glass fiber mesh in the glue solution for 3-5 minutes, lift the glass fiber mesh vertically at a ...

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Abstract

Photocatalyst preparation method for glass fiber net carried TiO2 fixed membrane belongs to degradation pollution technique field. Use flexible glass fiber net after heat treatment as carrier; take butyl titanate, alcohol, water and nitric acid as volume share of 1:3~12:0.02~0.2:0.01~0.1 to prepare sol-gal liquid; use soakage-pulling method to make hard coat; after airing, finish hydrolysis and polycondensation; finally, bake to remove organic and make TiO2 fastness; repeat process and obtain TiO2 fixed membrane with determined thickness. It is easy to operate and produce in large scale; the product has high purity and can be used repeatedly; the TiO2 fixed membrane photocatalyst of this invention has high activity, good durability, and large specific surface; the membrane module is convenient to assemble, with cheap price and wide application both for drink water advanced treatment, pretreatment and terminal treatment for toxic harmful high content hard-degradation organic waste water, and treatment for polluted air.

Description

technical field [0001] The present invention relates to a kind of TiO 2 A method for preparing a fixed film photocatalyst, specifically using a flexible glass fiber mesh as a base material, and preparing TiO on the glass fiber mesh 2 Fixed-film photocatalyst technology. Belongs to TiO 2 Fixed film photocatalytic degradation of environmental pollutants technical field. Background technique [0002] TiO 2 Photocatalysis has the advantages of non-toxicity, mild reaction conditions, low selectivity, high efficiency, and thorough degradation, so it has received extensive attention in recent years. In particular, it has been extensively studied in the treatment of refractory pollutants, and has broad application prospects in the advanced treatment of drinking water, wastewater and waste gas treatment. Compared with the traditional water purification process that mainly uses coagulation, sedimentation, filtration, and chlorine disinfection, the effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/04B01J37/02
Inventor 李田仇雁翎吕妍
Owner TONGJI UNIV
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