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Nano-silver odourless formaldehyde-removing preparation and preparation method thereof

A nano-silver and formaldehyde technology, applied in the direction of separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of not being suitable for large-scale production and use, environmental pollution, high price, etc., and achieve excellent formaldehyde removal effect, Reasonable process design and low production cost

Active Publication Date: 2021-06-01
忆净空气技术(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Formaldehyde has many uses in industry. The boards, paints, carpets, wallpapers, etc. commonly used in interior decoration contain and release formaldehyde. Cause skin necrosis; formaldehyde can cause gene mutation, can cause cancer, and cause great harm to the human body
[0003] The removal methods of formaldehyde in the prior art mainly include adsorption method, low temperature plasma method, photocatalytic decomposition method, catalytic oxidation method, etc. Catalysts are mainly divided into noble metal system and non-precious metal system, and the price of noble metal such as Au is relatively expensive, which is not suitable for large-scale Production and use, based on cost considerations, catalysts loaded with nano-silver have gradually entered our field of vision and become one of the main research directions of researchers
[0004] In the prior art, the formaldehyde removal efficiency of the catalyst loaded with nano-silver is low, and the actual processing technology is complicated, and it is easy to produce organic waste, which pollutes the environment. One of the technical problems to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of nano-silver odor-cleaning and formaldehyde-removing preparation, comprising the following steps:

[0035] (1) Take graphene oxide and deionized water, mix and stir for 30 minutes, add chitosan, adjust the pH to 6, stir for 10 hours, then raise the temperature to 170°C, perform hydrothermal reaction for 12 hours, add polyvinyl alcohol solution, and place at 80°C Stir in an oil bath for 40 minutes, ultrasonically disperse for 40 minutes, pre-cool at 0°C, and then carry out two-way freezing. After the freezing is complete, carry out low-temperature vacuum drying. During low-temperature vacuum drying, the drying temperature is -70°C and the drying pressure is 10Pa to obtain airgel;

[0036] (2) Take the airgel prepared in step (1), place it in a mixed acid solution, activate it for 4 hours, wash it with deionized water until it is neutral, and dry it in vacuum at 80° C.; the mixed acid includes concentrated sulfuric acid and concentrated nitric acid. ...

Embodiment 2

[0041] A preparation method of nano-silver odor-cleaning and formaldehyde-removing preparation, comprising the following steps:

[0042] (1) Take graphene oxide and deionized water, mix and stir for 34 minutes, add chitosan, adjust the pH to 6, stir for 11 hours, then heat up to 178°C, hydrothermally react for 11 hours, add polyvinyl alcohol solution, and place at 85°C Stir in an oil bath for 38 minutes, ultrasonically disperse for 45 minutes, pre-cool at 0°C, and then carry out two-way freezing. After the freezing is complete, carry out low-temperature vacuum drying. During low-temperature vacuum drying, the drying temperature is -70°C and the drying pressure is 10Pa to obtain airgel;

[0043] (2) Take the airgel prepared in step (1), place it in a mixed acid solution, activate it for 4.5 hours, wash it with deionized water until neutral, and dry it in vacuum at 83°C; the mixed acid includes concentrated sulfuric acid and concentrated nitric acid, The mass ratio of the concen...

Embodiment 3

[0048] A preparation method of nano-silver odor-cleaning and formaldehyde-removing preparation, comprising the following steps:

[0049] (1) Take graphene oxide and deionized water, mix and stir for 40 minutes, add chitosan, adjust the pH to 7, stir for 12 hours, then heat up to 180°C, perform hydrothermal reaction for 10 hours, add polyvinyl alcohol solution, and place at 90°C Stir in an oil bath for 30 minutes, ultrasonically disperse for 50 minutes, pre-cool at 0°C, and then carry out two-way freezing. After the freezing is complete, carry out low-temperature vacuum drying. During low-temperature vacuum drying, the drying temperature is -70°C, and the drying pressure is 10Pa to obtain airgel;

[0050] (2) Take the airgel prepared in step (1), place it in a mixed acid solution, activate it for 5 hours, wash it with deionized water until it is neutral, and dry it in vacuum at 85° C.; the mixed acid includes concentrated sulfuric acid and concentrated nitric acid. The mass rat...

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Abstract

The invention discloses a nano-silver odourless formaldehyde-removing preparation and a preparation method thereof. The main component of the nano-silver odourless formaldehyde-removing preparation is loaded aerogel, and the loaded aerogel is graphene oxide aerogel and is mainly prepared from graphene oxide, chitosan, polyvinyl alcohol and other components. The graphene oxide is not directly subjected to reduction functionalization treatment, instead, the graphene oxide and a chitosan solution are subjected to hydrothermal treatment under hydrothermal reaction, in the process, chitosan cannot be cross-linked to form a framework, and the chitosan and hydroxyl and carboxyl on the surface of the graphene oxide generate hydrogen-bond interaction, so that the chitosan is adsorbed on the surface of the graphene oxide. By means of the operation, a large number of amino groups and hydroxyl groups can be introduced to the surface of the graphene oxide. The preparation method is reasonable in process design and simple to operate, and the prepared preparation is excellent in formaldehyde removal effect, low in production cost, relatively low in influence of water vapor, applicable to a high-humidity environment and relatively high in practicability.

Description

technical field [0001] The invention relates to the technical field of formaldehyde removal, in particular to a nano-silver odor-removing formaldehyde preparation and a preparation method thereof. Background technique [0002] Formaldehyde has many uses in industry. The boards, paints, carpets, wallpapers, etc. commonly used in interior decoration contain and release formaldehyde. Cause skin necrosis; formaldehyde can cause gene mutation, can cause cancer, and cause great harm to the human body. [0003] The removal methods of formaldehyde in the prior art mainly include adsorption method, low-temperature plasma method, photocatalytic decomposition method, catalytic oxidation method, etc. Catalysts are mainly divided into noble metal system and non-precious metal system, and noble metals such as Au are relatively expensive and are not suitable for large-scale For production and use, based on cost considerations, catalysts loaded with nano-silver have gradually entered our f...

Claims

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Application Information

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IPC IPC(8): C01B32/198B22F9/26B01J23/66B01D53/86B01D53/72
CPCC01B32/198B22F9/26B01J23/66B01D53/8668
Inventor 崔其波
Owner 忆净空气技术(上海)有限公司
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