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Nanometer titanium dioxide catalyst for absorbing ultraviolet-visible light and its preparation method and application

A technology of nano-titanium dioxide and ultraviolet absorption, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of long initiation period and unstable yield, and achieve simple production process and high initiation effect, energy saving effect

Inactive Publication Date: 2006-05-31
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor reported in 2001 (Acta Polymer Sinica, No. 5, 2001) nano-TiO 2 / Na 2 SO 3 System solar photocatalytic polymerization of MMA, the first discovery of TiO under light 2 SO can be produced at the isoelectric point of 3 Free radicals initiate MMA polymerization, but the Na used in this system 2 SO 3 The higher the concentration, the polymerization rate is affected by the nano-TiO 2 (5-7)×10 -5 mol·l -1 , Monomer MMA3.74×10 -2 mol·l -1 and Na 2 SO 3 (5-7)×10 -3 mol·l -1 The impact of the concentration of the three, that is, the impact of the collision probability of the three, the initiation period is longer, and the yield is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 is the preparation of the nano-titanium dioxide catalyst of the present invention; Examples 2-6 are the application of the nano-titanium dioxide catalyst of the present invention.

[0014] Embodiment 1: Preparation of nano-titanium dioxide absorbing ultraviolet-visible light. Put 100g of titanium sulfate into a roasting boat and place it in a tube furnace, control the heating rate from 10°C / min to 600°C, control the air flow rate during the roasting process, roast at 600°C for 2.5 hours, and cool to obtain white ultrafine titanium dioxide powder product.

[0015] The product has been tested by XRD and BET, and the anatase type accounts for 94.9%. Rutile accounts for 5.1%, the average particle size is 20nm, and the specific surface area is 49m 2 / g, take 0.1g of the product and make a film with 5% polyvinyl alcohol. After deducting the blank, the measured absorption spectrum is at 280-460nm, and the maximum absorption peak is 327nm.

[0016] polymer...

Embodiment 3

[0018] Embodiment 3: it is 0.1mol l in containing the purified MMA monomer concentration -1 Add 1.5% TiO relative to the monomer in a transparent glass container 2(1-x) S x , at room temperature, after being uniformly dispersed by ultrasonic treatment, placed in an airtight place with a stopper under the average sunlight illumination of 9120Lex, it was triggered after 7 minutes, and the yield was greater than 95% after 35 minutes, and the product was still syndiotactic.

Embodiment 4

[0019] Embodiment 4: The conditions are the same as in Embodiment 2 except that the light source is a high-pressure mercury lamp, and the results obtained are the same as in Embodiment 2.

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Abstract

A nano-TiO2 catalyst able to absorb ultraviolet ray and visual light for the polymerization of perspex, preparing PMMA or TiO2 / PMMA, or catalytic degradation of organic substance has a molecular formula: TiO2(1-x)Sx, where X=0.01-0.06, and is prepared from cheap titanium sulfate through direct calcining.

Description

1. Technical field [0001] The invention relates to the preparation of nano titanium dioxide and its application in photocatalysis. Specifically, it belongs to a nano-titanium dioxide catalyst absorbing ultraviolet-visible light and its preparation method and application. 2. Background technology [0002] Since the 1980s, the excellent properties of nano-titanium dioxide in photolysis of water, functional composite materials and photocatalysis have attracted widespread attention in the fields of chemistry, materials and environmental protection around the world, and it is especially known as the green environmental protection in the 21st century. The material with the most practical application prospect. At present, nearly a hundred research articles are published every year in the world, mainly studying how to improve the light-absorbing ability and charge dispersion ability of nano-titanium dioxide, so as to improve the photocatalytic effect and reduce the cost, so as to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J27/053C08F4/18C08F2/28C08F220/14
Inventor 曲济方
Owner SHANXI UNIV
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