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Method for detecting optical self-cleaning material photocatalysis performance by fluorophotometry

A technology for photocatalysis and detection of light, which is applied in the directions of fluorescence/phosphorescence, material excitation analysis, preparation of test samples, etc. It can solve the problems of long time consumption and low sensitivity, and achieve the effect of high sensitivity and good accuracy

Inactive Publication Date: 2007-08-22
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art such as long time-consuming and low sensitivity, and provide a simple method for detecting various optical self-cleaning materials such as optical self-cleaning glass, optical self-cleaning ceramics, optical self-cleaning plastics and surface-coated nano TiO 2 Thin Films Possess Photocatalytic Activity Methods

Method used

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  • Method for detecting optical self-cleaning material photocatalysis performance by fluorophotometry

Examples

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Effect test

example 1

[0024] Example 1: Cut 4 kinds of commercial light self-cleaning glass: A, B, C, D into 4×3cm 2 of small pieces. Take 2 pieces of each light self-cleaning glass (24cm 2 ) were placed flat in a petri dish (simple reactor) with a diameter of 9cm, and the reactor was placed directly below a 9W ultraviolet lamp (λmax=254nm) (distance 20cm), and 20mL of coumarin (1.0×10 -3 mol / L, pH=3), turn on the light source, and photocatalytically oxidize coumarin. Take out 2mL of the solution every 10min and use a fluorescence spectrophotometer to detect the fluorescence intensity of the solution at an excitation wavelength of 346nm and a fluorescence wavelength of 456nm (slit width: Ex, Em: 5nm; sensitivity: high). Repeat 4 times. The fluorescence intensities measured under the above-mentioned conditions of these four kinds of optical self-gu glasses are plotted against their illumination time respectively, as shown in Figure 2, which are all straight lines; but the slopes K of these straig...

example 2

[0025] Example 2: Cut 4 kinds of commercial light self-cleaning glass: A, B, C, D into 4×3cm 2 of small pieces. Take 2 pieces of each light self-cleaning glass (24cm 2 ) were placed flat on a petri dish (simple reactor) with a diameter of 9cm, and the reactor was placed directly below a 9W ultraviolet lamp (λmax=254nm) (distance 15cm), and 30mL rhodamine B (5.0×10 -4mol / L, pH=6), turn on the light source, and photocatalytically degrade Rhodamine B. Take out 2mL of the solution every 10min and use a fluorescence spectrophotometer to detect the fluorescence intensity of the solution at an excitation wavelength of 550nm and a fluorescence wavelength of 573nm (slit width: Ex, Em: 5nm; sensitivity: high). Repeat 4 times. The fluorescence intensities of these four kinds of self-cleaning glasses measured under the above conditions are plotted against the illumination time, and they are all straight lines; however, the slopes K of these straight lines are different. The order of p...

example 3

[0026] Example 3: Cut 3 kinds of commercial light self-cleaning ceramics: E, F, G into 3×3cm 2 of small pieces. Take 4 pieces of each (36cm 2 ) were placed flat in a petri dish (simple reactor) with a diameter of 9cm, and the reactor was placed directly under a 9W ultraviolet lamp (λmax=254nm) (distance 15cm), and 50mL of 8-hydroxyquinoline aluminum (2.0× 10 -4 mol / L, pH=4), turn on the light source, and photocatalytically degrade 8-hydroxyquinoline aluminum. Take out 2mL of solution every 10min and use a fluorescence spectrophotometer to detect the fluorescence intensity of the solution at an excitation wavelength of 360nm and a fluorescence wavelength of 500nm (slit width: Ex, Em: 10nm; sensitivity: mid). Repeat 4 times. The fluorescence intensities measured under the above conditions for the three kinds of self-cleaning ceramics were plotted against the illumination time, and they were all straight lines. The order of catalytic activity is: E>F>G.

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Abstract

A fluorescence spectrophotometry to test optical self-cleaning materials and a method of photochemical catalysis for activity for file materials with nano TiO2 coated surface. Its steps are: (1) Intercept 10-50cm2 optical self-cleaning materials into reactor. (2) Add organic compound solution and take out 2mLto test fluorescence intensity of solution without illumination. (3) Open violet lamp, take out 2mL every 10min to test fluorescence intensity like above for 4~6 times. (4) Graph based on fluorescence intensity of solution and illumination time is a line, whose absolute value of slope K great indicates strong photochemical catalysis and oxidation of tested optical self-cleaning materials. The invention has merits of high sensitivity, good accuracy, shortcut and simple, which can be used to test photochemical catalysis capability of optical self-cleaning materials.

Description

technical field [0001] The invention relates to a rapid detection method for the properties of optical self-cleaning materials. In particular, it relates to a self-cleaning material and surface coating nano-TiO 2 Methods for the photocatalytic activity of thin film materials. technical background [0002] Optical self-cleaning materials are a general term for a large class of materials that have self-cleaning functions under the irradiation of sunlight or ultraviolet light. Their self-cleaning ability is mainly derived from their surface nano-photocatalyst film (generally nano-TiO 2 ) photocatalytic properties and amphiphilic (hydrophilic and lipophilic). Nano TiO on its surface 2 Under the action of light, with O in the air 2 Or a small amount of water reacts to generate ·OH, ·O 2 - , OOH and a series of oxygen-containing free radicals with strong oxidation ability can remove toxic and harmful pollutants from the air (or water) and can deodorize, prevent pollution an...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N21/64G01N1/28
Inventor 朱丽华周和慧陈志飞唐和清
Owner HUAZHONG UNIV OF SCI & TECH
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