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Enhanced carboxylated graphene modified polyurethane carrier and its preparation method and application

A technology of carboxylated graphene and polyurethane, which is applied in the field of water treatment, can solve the problems that the biological load of the modified polyurethane carrier has not been greatly improved, the hydrophilicity and bioadhesion are poor, and the efficiency of sewage treatment is reduced. Shorten the biofilm development process, increase the amount of biofilm formation, and improve the effect of hydrophilicity

Active Publication Date: 2022-05-17
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in practical applications, the commonly used polyurethane microbial carriers have poor hydrophilicity and bioadhesion, resulting in a slow rate of microbial film formation, thereby reducing the efficiency of sewage treatment
Although those skilled in the art have modified polyurethane to improve the efficiency of treating microorganisms in sewage, in the prior art, it is usually one-dimensional or two-dimensional modification of the polyurethane carrier, and the obtained modified polyurethane carrier Bioburden did not increase significantly
[0004] Therefore, the technology in the art needs a kind of novel polyurethane carrier badly, to solve the problem that the bioburden of existing polyurethane microbial carrier exists is low

Method used

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  • Enhanced carboxylated graphene modified polyurethane carrier and its preparation method and application
  • Enhanced carboxylated graphene modified polyurethane carrier and its preparation method and application
  • Enhanced carboxylated graphene modified polyurethane carrier and its preparation method and application

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preparation example Construction

[0054] In a second aspect, embodiments of the present invention provide a method for preparing a reinforced carboxylated graphene-modified polyurethane carrier, such as figure 1 As shown, specifically, the following steps may be included:

[0055] Step 1 (S11), irradiating the first post-treated polyurethane sponge with an ultraviolet lamp to obtain a first intermediate product.

[0056] In this embodiment, the polyurethane sponge after the first post-treatment is clean and dry. During specific implementation, the clean and dry polyurethane sponge is spread under the ultraviolet lamp and irradiated for 30-60 minutes. During the irradiation process of the ultraviolet lamp, the amide bond in the polyurethane is broken, and the carboxylic acid group is formed to obtain the first intermediate product.

[0057] Optionally, in step 1 of this embodiment, the first post-processing includes:

[0058] Put the polyurethane sponge in an ultrasonic cleaner to vibrate and wash for 30-40 m...

Embodiment 1

[0074] Embodiment 1 (preparation of enhanced carboxylated graphene modified polyurethane carrier)

[0075] (1) Cut the polyurethane carrier into a sphere with a diameter of about 1 cm, put it into an ultrasonic cleaner and shake and wash it for 30 minutes, wash it with deionized water, and dry it in an oven to obtain a clean polyurethane carrier;

[0076] (2) Spread the clean and dry polyurethane carrier under the ultraviolet lamp and irradiate it for 60 minutes, the amide bond in the polyurethane is broken, forming a carboxylic acid group, and obtaining the first intermediate product;

[0077] (3) Prepare 6wt% ethanol solution of silane coupling agent KH550 (γ-aminopropyltriethoxysilane, APTS), and oscillate ultrasonically for 10 minutes to fully disperse the solution;

[0078] (4) Preparation of carboxylated graphene: 1.5g of graphite powder was added to 200mL of 9:1 sulfuric acid / phosphoric acid mixed solution and stirred evenly and placed in an ice-water bath; 9.0g of pota...

Embodiment 2

[0083] Embodiment 2 (immobilization of microorganisms)

[0084] Using the enhanced carboxylated graphene-modified polyurethane carrier prepared in Example 1, a biofilm test was carried out. The biological immobilization carrier is first soaked with nutrient solution, placed in a 500mL glass triangular flask, and 200mL of nutrient solution is added to the bottle. Bacteria agent was added at 4g / L. Cultured in a constant temperature shaker, the temperature was set at 30°C.

[0085] On the 21st day of culture, Figure 5 The SEM figure of the unmodified polyurethane carrier bio-hanging film culture test is shown, Image 6 Shown is the SEM image of the enhanced carboxylated graphene-modified polyurethane carrier prepared in Embodiment 1 after the membrane-hanging culture test. like Figure 5 and Image 6 As shown, compared with the unmodified polyurethane carrier control, when cultured to the 21st day, the unmodified polyurethane carrier of the control group only found a small...

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Abstract

The invention provides an enhanced carboxylated graphene modified polyurethane carrier and its preparation method and application. In this carrier, by grafting multi-layer carboxylated graphene on the surface of the polyurethane carrier, the specific surface area and surface roughness of the polyurethane carrier are increased, the microbial surface attachment process is improved, and the bioload capacity of the carrier is improved; and, through carboxylated graphene Alkene introduces surface-active functional groups such as carboxyl and hydroxyl groups into the polyurethane carrier to improve the hydrophilicity of the modified polyurethane bio-carrier, thereby enhancing the bio-affinity of the carrier and helping to shorten the biofilm development process on the surface of the modified bio-carrier. Therefore, the modified polyurethane carrier provided by the present invention has the characteristics of strong thermal stability, short biofilm formation time, large amount of biofilm formation, etc., and has good application prospects in biological reaction sewage treatment systems.

Description

Technical field [0001] The invention relates to the field of water treatment, and mainly relates to an enhanced carboxylated graphene modified polyurethane carrier and its preparation method and application. Background technique [0002] In the biological treatment process of wastewater, the biofilm method introduces microbial carriers to provide a large number of attachment sites for sewage treatment microorganisms, and locates free microbial cells within the carrier space to achieve the purpose of purifying the water environment. At present, polyurethane is the most widely used biological carrier filler. [0003] However, in practical applications, the hydrophilicity and bioadhesion of commonly used polyurethane microbial carriers are poor, resulting in slow microbial film growth, thus reducing the efficiency of sewage treatment. Although those skilled in the art have modified polyurethane to improve the efficiency of treating microorganisms in sewage, however, in the pri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C08G18/83
CPCC02F3/34C08G18/837Y02W10/10
Inventor 籍国东王亚芹
Owner PEKING UNIV