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Chitosan quaternary ammonium HTCC/polyethersulfone composite nanofiltration membrane and preparation

A quaternary ammonium salt chitosan, polyethersulfone ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of unsatisfactory pure water permeability, poor mechanical strength, high swelling degree, and achieve good hydrophilic performance and mechanical performance. , the effect of high retention rate and simple process

Inactive Publication Date: 2015-01-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hoven et al. immersed the chitosan membrane in 10.0mL of anhydrous methanol solution containing 0.16gNaOH and 0.30gNaI, added 0.6g methyl iodide in portions and reacted at 40°C to obtain a positively charged chitosan membrane, and the original chitosan Compared with the membrane, the membrane has better selective adsorption to protein and less dependence on pH value, but the membrane has higher swelling degree in water and poorer mechanical strength (Hoven V P, Tangpasuthadol V, Angkitpaiboon Y, Vallapa N and Kiatkamjornwong S. Surface-charged chitosan: Preparation and protein absorption. Carbohydrate Polymers, 2007, 68(1): 44-53)
Huang et al. used toluene diisocyanate as a crosslinking agent to prepare a modified chitosan GCTACC / polyacrylonitrile positively charged nanofiltration membrane by a composite method, but the pure water permeability of the membrane was not ideal (Huang R H, Chen G H, Sun M K and Gao C J. Preparation and characterization of composite NF membrane from a graft copolymer of trimethylallyl ammonium chloride onto chitosan by toluene diisocyanate cross-linking. Desalination, 2009, 239: 38-45)

Method used

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  • Chitosan quaternary ammonium HTCC/polyethersulfone composite nanofiltration membrane and preparation
  • Chitosan quaternary ammonium HTCC/polyethersulfone composite nanofiltration membrane and preparation
  • Chitosan quaternary ammonium HTCC/polyethersulfone composite nanofiltration membrane and preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Dissolve a certain amount of refined HTCC sample in deionized water to prepare a casting solution with a mass concentration of 1.0%, absorb the casting solution and apply it evenly on three polyethersulfone ultrafiltration membranes to obtain a wet film Evaporate at a temperature below 50°C to form a dry film. Then, soak the three dry films in containers containing epichlorohydrin ethanol solutions (50 mL of ethanol) with a mass concentration of 1.6%, 1.9%, and 2.2%, respectively. The amount of KOH added is 0.4 g. -55 ℃ cross-linking reaction for more than 20h. After the cross-linking reaction is completed, the film is taken out and heat-treated at 45-55°C for 20min-30min. Finally, the composite membrane was washed with deionized water, soaked in deionized water for more than 24 hours, and then tested.

[0031] The prepared 3 films against 1.0g / L MgCl 2 The interception rate of the solution is 79.1%, 90.4%, 73.0%, and the water flux is 7.91, 7.12, 6.96L·m ...

Embodiment 2

[0032] Example 2: Dissolve the refined HTCC sample in deionized water, and make casting solutions with mass concentrations of 1.0%, 1.5%, and 2.0% respectively, and sequentially draw appropriate amount of casting solutions on three polyethersulfone ultrafiltration membranes. After coating, the obtained wet film is evaporated into a dry film at a temperature below 50°C. Then, soak the three dry films in containers filled with 1.9% epichlorohydrin ethanol solution (50mL of ethanol), add 0.4g of KOH, seal it, and conduct cross-linking reaction at 45-55°C More than 20 hours. After the cross-linking reaction is completed, the film is taken out and heat-treated at 45-55°C for 20min-30min. Finally, the composite membrane was washed with deionized water, soaked in deionized water for more than 24 hours, and then tested.

[0033] The prepared 3 films against 1.0g / L MgCl 2 The interception rate of the solution is 90.4%, 87.8%, 81.6%, and the water flux is 7.12, 4.77, 5.69L·m -2 h -...

Embodiment 3

[0034]Embodiment 3: a certain amount of refined HTCC sample is dissolved in deionized water, made into a casting solution with a mass concentration of 1.0%, and an appropriate amount of casting solution is drawn and evenly coated on 3 polyethersulfone ultrafiltration membranes, and the obtained wet The film is evaporated into a dry film at a temperature below 50°C. Then, immerse the three dry films in containers filled with epichlorohydrin ethanol solution with a mass concentration of 1.9% (50 mL of ethanol). The amount of KOH added is 0.2 g, 0.3 g, and 0.4 g. 45-55 ℃ cross-linking reaction for more than 20h. After the cross-linking reaction is completed, the film is taken out and heat-treated at 45-55°C for 20min-30min. Finally, the composite membrane was washed with deionized water, soaked in deionized water for more than 24 hours, and then tested.

[0035] The prepared 3 films against 1.0g / L MgCl 2 The rejection rate of the solution is 81.0%, 91.9%, 84.7%, and the water ...

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Abstract

The invention provides a preparation method of a chitosan quaternary ammonium HTCC / polyethersulfone (PES) positively charged composite nanofiltration membrane. According to the preparation method, positively charged 2-hydroxypropyltrimethyl ammonium chloride chitosan (HTCC) is used as a surface-active functional layer, a polyethersulfone ultrafilter membrane with good hydrophilic performance is used as a supporting layer, epoxy chloropropane (ECH) is used as a cross-linking agent, and a coating and crosslinking reaction method is adopted to prepare the positively charged chitosan composite nanofiltration membrane. The preparation method has a simple technology and is natural and environmentally friendly. The positively charged composite nanofiltration membrane prepared by the above method has good hydrophilic performance and excellent mechanical property. Water flux under the operating pressure of 0.4 MPa is 4.77-8.96L.m<-2>.h<-1>, and the positively charged composite nanofiltration membrane has high retention rate for organic matters with molecular weight being more than 600 and inorganic salt solutions such as MgCl2 and the like, and can be used for separating and removing micro / trace pollutants, especially positively charged matters.

Description

technical field [0001] The invention relates to a chitosan positively charged composite nanofiltration membrane and a preparation method thereof, in particular to a nanofiltration membrane with good hydrophilicity, good mechanical properties and high rejection rate and a preparation method thereof, belonging to the field of membrane separation. Background technique [0002] Nanofiltration is a new pressure-driven membrane separation technology between ultrafiltration and reverse osmosis. Its intercepted particle size is smaller than that of ultrafiltration, its permeability is higher than that of reverse osmosis, and its operating pressure is low. develop. Nanofiltration membrane treatment technology is not easy to produce toxic by-products, and has a good interception effect on organic matter with a molecular mass of 150-1000, and has potential advantages in removing trace-trace organic pollutants in the environment. However, most of the currently commercialized nanofiltra...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68B01D67/00
Inventor 黄中华刘郑丽朱立君古丽米拉·艾克拜尔
Owner NANJING UNIV OF SCI & TECH
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