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A photocatalytic system with photoresponsive switch and self-indicating, its preparation method and application

A photocatalytic and light-responsive technology, applied in the field of photocatalysis, can solve the problems of inability to achieve plastic regulation, no indication system, and no stable period for plastics.

Active Publication Date: 2020-11-20
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of photocatalysts in the field of plastic degradation encounters the following two bottleneck problems: one, due to the high efficiency of photocatalysts, the plastics have no stable period, and the control of the plastic stable period cannot be realized (CN101181678B,); , transportation, sales and use, due to different environmental factors, the degree of degradation of the plastic itself is different, and there is no indication system to provide users with information on whether the plastic is suitable for use

Method used

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  • A photocatalytic system with photoresponsive switch and self-indicating, its preparation method and application
  • A photocatalytic system with photoresponsive switch and self-indicating, its preparation method and application
  • A photocatalytic system with photoresponsive switch and self-indicating, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Step 1: Put I 2 And KI according to the molar ratio I 2 :KI=1:2, add it to the hydroxyethyl cellulose solution (molecular weight 90000) with a concentration of 0.25g / L, stir evenly, where I 2 The mass ratio to hydroxyethyl cellulose is 1:1. Add anatase TiO to the resulting mixed solution 2 Powder, TiO 2 Powder and I 2 The mass ratio is 1:2. The mixture was stirred for 24h, separated by filtration, and then dried in an oven at 35°C. Grinding I 3 - / I - Modified TiO 2 powder.

[0082] Step 2: Infiltrate 0.1g of amylose with 1mL of ethanol, then add 9mL of NaOH solution (1mol / L), heat in a boiling water bath for 10 minutes, cool to room temperature, dilute to 100mL with water to obtain a concentration of 1mg / mL amylose mixture liquid.

[0083] Step 3: Use HCl to adjust the pH value of the amylose mixture to 6.5-7.5 to prepare an amylose mixture with a pH of 6.5-7.5.

[0084] Step 4: Put the prepared I 3 - / I - Modified TiO 2 Add the powder to the amylose mixture with a pH of 6...

Embodiment 2

[0086] Same as Example 1, the difference is that I 2 And KI according to the molar ratio I 2 :KI=1:2 is added to 0.25g / L polyvinyl alcohol solution, the polyvinyl alcohol solution contains 2w% acetone, I 2 The concentration is 0.5g / L. Prepared photocatalytic system sample 2 with light response switch and self-indicating.

Embodiment 3

[0088] The same as Example 1, except that isopropanol was used instead of ethanol, and 100°C reflux was used instead of boiling water bath to prepare a photocatalytic system sample 3 with a light-responsive switch and self-indicating property.

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Abstract

The invention discloses a photocatalytic system with light-responsive switching and self-indicating properties, its preparation method and application, especially the universal application of the photocatalytic system in the field of controllable self-indicating degradation of plastics. The invention relates to a photocatalytic system that utilizes a photocatalyst, a photogenerated electron-hole consuming agent and a photogenerated electron-hole consuming agent complex to react with a photogenerated electron-hole consuming agent and a photogenerated electron-hole consuming agent complex. The color changes before and after to build a photocatalytic system with light-responsive switching and self-indicating properties. In the early stage of illumination, the photocatalytic system has a certain color and has no photocatalytic activity. After a certain period of illumination, the color of the photocatalytic system changes and it has high-efficiency photocatalytic activity. The photocatalytic system can be added to plastics as a filler to provide plastics with controllable self-indicating degradability. The plastic has high stability during use and high degradation efficiency during disposal. And use the color change of the photocatalytic system to indicate to consumers the beginning of the plastic disposal period.

Description

Technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a photocatalytic system with a light-responsive switch and self-indicating property, a preparation method and application in the field of plastic degradation, and in particular to a photocatalytic system in controlling the stable period, degradation period and degradation efficiency of plastics And the use of color changes to show the beginning of the plastic degradation period. Background technique [0002] my country produces 50 million tons of non-decomposable plastic waste every year, which brings a great burden to the environment. Biodegradable plastics can reduce plastic pollution. However, biodegradable plastics have not been widely used because of their fragility, low mechanical properties, low heat resistance, and low gas barrier properties. Traditional plastics occupy a huge market share due to their good mechanical properties, thermal stability, chemical and biologica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J31/26C08L23/06C08L25/06C08L77/02C08L23/12C08L29/04C08L71/02C08L3/02C08L1/28C08K9/02C08K3/22C08K3/02C08K3/16C08K3/24C08K3/26C08K3/34C08K3/30C08K3/28C08J5/18
CPCB01J31/38B01J31/26C08J5/18C08J2323/06C08J2325/06C08J2377/02C08J2323/12C08J2329/04C08J2371/02C08J2403/02C08J2401/28C08K9/02C08K2003/2241C08K3/02C08K3/16C08K2201/014C08K3/24C08K3/26C08K2003/2296C08K2003/2293C08K3/34C08K3/30C08K2003/2258C08K2003/2248C08K3/28B01J35/39Y02P20/52
Inventor 陈超赵玉婷
Owner EAST CHINA NORMAL UNIV
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