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Quaternized chitosan HTCC-silver/polyethersulfone antibacterial membrane and preparation thereof

A technology of quaternized chitosan and antibacterial membrane, applied in the field of membrane separation, can solve the problem of few preparation reports, and achieve the effects of excellent hydrophilic performance, good reproducibility and high retention rate

Inactive Publication Date: 2016-08-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, a variety of methods for the preparation of silver nanoparticles have been reported in the literature, including photoreduction and electrochemical methods, but their use in the preparation of silver-organic polymer nanocomposites is rarely reported.

Method used

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  • Quaternized chitosan HTCC-silver/polyethersulfone antibacterial membrane and preparation thereof
  • Quaternized chitosan HTCC-silver/polyethersulfone antibacterial membrane and preparation thereof
  • Quaternized chitosan HTCC-silver/polyethersulfone antibacterial membrane and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: A certain amount of refined HTCC sample was dissolved in deionized water to prepare a casting solution with a mass concentration of 1.0%, and an appropriate amount of casting solution was absorbed and uniformly coated on the polyethersulfone ultrafiltration membrane to obtain the wet The membrane was placed at 50°C for solvent evaporation for 2 hours. Then, the dry film was immersed in a container containing an ethanol solution of epichlorohydrin with a mass concentration of 1.9%, the ratio of KOH added to epichlorohydrin was 3:6.5 g / mL, sealed, and cross-linking reaction was performed for 22 hours. After the crosslinking reaction was completed, the film was taken out and heat-treated at 50°C for 20 minutes. The composite membrane is washed with deionized water and soaked in deionized water for more than 24 hours. After the membrane is naturally dried, it is immersed in a 0.3mmol / L silver nitrate solution at room temperature, taken out after 30 minutes, and d...

Embodiment 2

[0042] Example 2: A certain amount of refined HTCC sample was dissolved in deionized water to prepare a casting solution with a mass concentration of 1.0%, and an appropriate amount of casting solution was absorbed and uniformly coated on the polyethersulfone ultrafiltration membrane to obtain the wet The membrane was placed at 50°C for solvent evaporation for 2 hours. Then, the dry film was immersed in a container containing an ethanol solution of epichlorohydrin with a mass concentration of 1.9%, the ratio of KOH added to epichlorohydrin was 3:6.5 g / mL, sealed, and cross-linking reaction was performed for 22 hours. After the crosslinking reaction was completed, the film was taken out and heat-treated at 50°C for 20 minutes. The composite membrane is washed with deionized water and soaked in deionized water for more than 24 hours. After the membrane is naturally dried, it is immersed in a 0.5mmol / L silver nitrate solution at room temperature, taken out after 30 minutes, and d...

Embodiment 3

[0044] Example 3: A certain amount of refined HTCC sample was dissolved in deionized water to prepare a casting solution with a mass concentration of 1.0%, and an appropriate amount of casting solution was absorbed and uniformly coated on the polyethersulfone ultrafiltration membrane to obtain the wet The membrane was placed at 50°C for solvent evaporation for 2 hours. Then, the dry film was immersed in a container containing an ethanol solution of epichlorohydrin with a mass concentration of 1.9%, the ratio of KOH added to epichlorohydrin was 3:6.5 g / mL, sealed, and cross-linking reaction was performed for 22 hours. After the crosslinking reaction was completed, the film was taken out and heat-treated at 50°C for 20 minutes. The composite membrane is washed with deionized water and soaked in deionized water for more than 24 hours. After the membrane is naturally dried, it is immersed in a 0.7mmol / L silver nitrate solution at room temperature, taken out after 30 minutes, and d...

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Abstract

The invention discloses a preparation method of a quaternary ammonium chitosan HTCC-silver / PES antibacterial film. First, the positively charged HTCC is used as the surface active functional layer, the PES ultrafiltration membrane with good hydrophilic performance is used as the support layer, and epichlorohydrin is used as the crosslinking agent, and the positively charged quaternary ammonium is prepared by coating crosslinking reaction method. Chitosan HTCC / PES composite nanofiltration membrane. Then soak the nanofiltration membrane in a certain concentration of silver nitrate solution, and dry the membrane with a nitrogen blower. Finally, photochemical reduction technology is used to reduce the silver ions on the membrane surface into silver particles. The preparation method has a simple process, can be carried out at normal temperature, has good reproducibility, does not need to add a reducing agent, is easy to control the particle size, and is natural and environmentally friendly. The antibacterial film prepared according to this method has excellent hydrophilic properties, mechanical properties and swelling properties, and is resistant to Gram-negative bacteria E. coli Rosetta and E. coli DH5α and Gram-positive bacteria Bacillus subtilis Both have good antibacterial ability, and this kind of membrane has a high rejection rate for most PPCPs, and can be used for the separation and removal of trace-trace pollutants in the water environment, especially positively charged substances.

Description

Technical field [0001] The invention relates to a quaternized chitosan HTCC-Ag / PES antibacterial film and a preparation method thereof, in particular to a composite film with good mechanical properties, swelling performance, and certain antibacterial and separation capabilities, and a preparation method thereof. Membrane separation field. Background technique [0002] Chitosan is a product obtained by deacetylation of chitin. It is an amorphous translucent substance, non-toxic, harmless, easily biodegradable, does not pollute the environment, and has good adsorption, film-forming properties, Environmentally friendly functional polymer material with hygroscopicity and other characteristics. Although chitosan contains free amino groups, it can only be soluble in dilute acids such as hydrochloric acid, acetic acid, lactic acid, benzoic acid, and formic acid, but not in water, alkaline solutions and most organic solvents. This greatly limits the application of chitosan. And based ...

Claims

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Application Information

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IPC IPC(8): B01D71/74B01D69/12B01D69/02B01D67/00C02F1/44
Inventor 黄中华古丽米拉·艾克拜尔殷艳娜张岩刘郑丽孙倩玉蒋正飞
Owner NANJING UNIV OF SCI & TECH
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