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Photocatalytic self-cleaning glass and preparation method thereof

A self-cleaning and photocatalytic technology, applied in the field of photocatalytic self-cleaning composite materials, can solve problems such as inability to coat the surface, and achieve the effects of improving hydrophilicity, excellent photocatalytic self-cleaning performance, and excellent degradation ability.

Pending Publication Date: 2021-04-20
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer semiconductors cannot be surface-coated by evaporation and other methods like transition metal semiconductors

Method used

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  • Photocatalytic self-cleaning glass and preparation method thereof
  • Photocatalytic self-cleaning glass and preparation method thereof
  • Photocatalytic self-cleaning glass and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of photocatalytic self-cleaning glass, which comprises the following process steps:

[0028] 1) Preparation of CNNS: add g-C 3 N 4 Disperse with sodium hydroxide in deionized water at a mass ratio of 1:4, ultrasonically stir and reflux for 3 hours to obtain a uniformly dispersed white CNNS dispersion, which is filtered, washed, and vacuum-dried to obtain CNNS;

[0029] 2) Preparation of A and B solutions: add deionized water and CNNS obtained in step 1) to container A, mix and prepare A solution with a CNNS concentration of 3.2g / L through ultrasonic treatment, and add deionized water and PDDA to container B , mix and prepare the B solution that PDDA concentration is 1g / L;

[0030] 3) Construct composite material: Take the glass substrate after surface hydroxylation treatment, place it in solution B for 15 minutes, wash it with deionized water, and place it in solution A for 15 minutes to complete the deposition of the first layer of PDDA-CNNS nano...

Embodiment 2

[0044] A preparation method of photocatalytic self-cleaning glass, which comprises the following process steps:

[0045] 1) Preparation of CNNS: add g-C 3 N 4 Disperse with strong base in deionized water at a mass ratio of 1:3, ultrasonically stir and reflux for 3.5 hours to obtain a uniformly dispersed white CNNS dispersion, which is filtered, washed, and vacuum-dried to obtain CNNS;

[0046] 2) Preparation of A and B solutions: add deionized water and CNNS obtained in step 1) to container A, mix and prepare A solution with a CNNS concentration of 4g / L through ultrasonic treatment, add deionized water and PDDA to container B, Mix and prepare the B solution whose PDDA concentration is 1g / L;

[0047] 3) Construction of composite materials: Take the glass substrate after surface hydroxylation treatment, place it in solution B for 20 minutes, wash it with deionized water, and place it in solution A for 20 minutes to complete the deposition of the first layer of PDDA-CNNS nano f...

Embodiment 3

[0051] A preparation method of photocatalytic self-cleaning glass, which comprises the following process steps:

[0052] 1) Preparation of CNNS: add g-C 3 N 4 Disperse with a strong base in deionized water at a mass ratio of 1:3.5, ultrasonically stir and reflux for 5 hours to obtain a uniformly dispersed white CNNS dispersion, which is filtered, washed, and vacuum-dried to obtain CNNS;

[0053] 2) Preparation of A and B solutions: add deionized water and CNNS obtained in step 1) to container A, mix and prepare A solution with a CNNS concentration of 5g / L through ultrasonic treatment, add deionized water and PDDA to container B, Mix and prepare the B solution whose PDDA concentration is 2g / L;

[0054] 3) Construction of composite materials: Take the glass substrate after surface hydroxylation treatment, place it in solution B for 20 minutes, wash it with deionized water, and place it in solution A for 20 minutes to complete the deposition of the first layer of PDDA-CNNS nano...

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Abstract

The invention discloses a preparation method of photocatalytic self-cleaning glass, which comprises the following steps: 1) dispersing g-C3N4 and strong base in deionized water to obtain a CNNS white dispersion liquid, filtering, washing, and carrying out vacuum drying; 2) adding deionized water and CNNS into a container A to prepare a solution A, and adding deionized water and PDDA into a container B to prepare a solution B; 3) taking the glass substrate subjected to surface hydroxylation treatment, and sequentially soaking in a solution B, washing with deionized water and soaking in a solution A to realize accumulation of a layer of PDDA-CNNS nano-film; and repeatedly stacking for multiple times to form the multi-layer PDDA-CNNS nano-film. The multilayer PDDA-CNNS nano-film is constructed on the glass substrate in a layer-by-layer electrostatic self-assembly mode, separation of photo-induced electrons and holes on the self-cleaning surface is facilitated, the photocatalytic capacity of the g-C3N4 material is further improved, transition metal is not contained in the preparation process, and the preparation method is simple in process step, environmentally friendly and non-toxic.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a photocatalytic self-cleaning composite material. Background technique [0002] Photocatalysts, such as common oxide sulfide semiconductors such as titanium dioxide, zinc oxide, tin oxide, zirconium dioxide, and cadmium sulfide, generate photogenerated electron-hole pairs in situ on the photocatalyst under the action of light. Holes can lie in the medium (O 2 、H 2 O) After combining or directly acting on various organic substances, the organic substances are oxidized and decomposed. Therefore, photocatalysts are widely used in photocatalytic degradation, sterilization, deodorization and antifouling self-cleaning. [0003] At present, photocatalytic self-cleaning glass is mainly constructed by doped or non-doped titanium dioxide nano-films on the glass surface, and the construction methods include chemical vapor deposition, evaporation and other methods. The nanosurfaces co...

Claims

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Application Information

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IPC IPC(8): C03C17/34
Inventor 鲁福身游耿书陈冬青刘宇星杨文欣夏红
Owner SHANTOU UNIV