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Quaternized chitosan/polyacrylic acid composite nanofiltration membrane and preparation method thereof

A technology of quaternized chitosan and composite nanofiltration membrane, which is applied in the field of membrane separation, can solve the problems of weak positive charge and low flux, achieve good acid resistance and alkali resistance, good antibacterial effect, good The effect of interception effect

Inactive Publication Date: 2017-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of weak positive charge and low flux in existing nanofiltration membranes, the invention provides a quaternized chitosan / polyacrylic acid ((HTCC / PAA)n) composite nanofiltration membrane and preparation method thereof, the (HTCC / PAA)n composite nanofiltration membrane has good hydrophilicity, good antibacterial performance and high rejection rate

Method used

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  • Quaternized chitosan/polyacrylic acid composite nanofiltration membrane and preparation method thereof
  • Quaternized chitosan/polyacrylic acid composite nanofiltration membrane and preparation method thereof
  • Quaternized chitosan/polyacrylic acid composite nanofiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Prepare a 5g / L HTCC solution and a 1g / L PAA solution, adjust the pH of the PAA solution to 4, 7, and 10 with NaOH solution, and add NaCl as a supporting salt to the HTCC solution and PAA solution to make the NaCl concentration 0.05 g / L HTCC casting solution and PAA casting solution. Soak three PES base films in HTCC casting solution for 15 min, wash them with pure water to obtain composite films with positive charges on the surface; After washing with water, a composite film with a negatively charged surface is obtained, completing a double layer. The soaking was repeated to obtain a composite membrane with 4.5 double layers. Then, soak the three dry films in the ethanol solution of epichlorohydrin adjusted by KOH, pH 9, mass concentration 1.3%, cross-linking reaction at 50°C for 21 hours, after the cross-linking reaction is completed, dry, and remove Wash with deionized water, soak in pure water for more than 24 hours, and wait for determination.

[0024] The prepar...

Embodiment 2

[0026] Prepare a 5g / L HTCC solution, then take quantitative PAA and prepare 0.5g / L, 1g / L, 1.5g / L, 2g / L, 2.5g / LPAA solutions with pure water, and adjust the pH of the PAA solution to 7. Add NaCl as a supporting salt to the HTCC and PAA solutions respectively to prepare HTCC casting solutions and PAA casting solutions with a NaCl mass concentration of 0.05 g / L. Soak 5 pieces of PES base films in HTCC casting solution for 15 minutes, wash them with pure water to obtain composite films with positive charges on the surface; After washing, a composite film with a negatively charged surface is obtained, completing a double layer. The soaking was repeated to obtain a composite membrane with 4.5 double layers. Then, 5 pieces of dry films were respectively soaked in the ethanol solution of epichlorohydrin with pH 9 and mass concentration of 1.9% mediated by KOH, and cross-linked at 50°C for 21 hours. After the cross-linking reaction was completed, they were dried and removed Wash with...

Embodiment 3

[0029] Take quantitative HTCC and prepare 4g / L, 5g / L, 6g / L HTCC solutions with pure water respectively, prepare 1g / LPAA solution, adjust the pH of PAA solution to 7 with NaOH solution, and then add NaCl to HTCC and PAA solutions respectively As supporting salt, HTCC casting solution and PAA casting solution with NaCl mass concentration of 0.05g / L were prepared. Soak three PES base films in HTCC casting solution for 15 minutes, wash them with pure water to obtain composite films with positive charges on the surface; After washing, a composite film with a negatively charged surface is obtained, completing a double layer. The soaking was repeated to obtain a composite membrane with 4.5 double layers. Then, soak the three dry films in the ethanol solution of epichlorohydrin with a pH of 9 and a mass concentration of 2.5% mediated by KOH, and conduct a cross-linking reaction at 50°C for 21 hours. After the cross-linking reaction is completed, dry and remove Wash with deionized wa...

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Abstract

The invention discloses a quaternized chitosan / polyacrylic acid composite nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: by a layer-by-layer deposition method, taking positively-charged 2-hydroxypropyl trimethylammonium chloride chitosan as a cationic polymer and polyacrylic acid as an anionic polymer, then introducing a NaCl solution as a supporting salt, alternately depositing, self-assembling layer by layer to form a composite membrane, and finally crosslinking in epoxy chloropropane to obtain the composite nanofiltration membrane. The preparation method provided by the invention is simple in process, natural and environment-friendly; the prepared positively-charged composite nanofiltration membrane has good hydrophilicity, excellent mechanical properties and an excellent swelling property, has the purified water permeation coefficient of 19.29L.h<-1>.m<-2>.Mpa and the cutoff molecular weight of 989, and can be used for separating and removing micro-trace pollutants, especially the positively-charged substances, in a water environment.

Description

technical field [0001] The invention relates to a quaternized chitosan / polyacrylic acid composite nanofiltration membrane and a preparation method thereof, belonging to the field of membrane separation. Background technique [0002] Layer-by-layer self-assembly is to use the principle of alternate deposition of polyelectrolytes layer by layer, through the strong interaction (such as chemical bonds, etc.) Bonds, etc.), a technology that forms a thin film with complete structure, stable performance, and a certain specific function. Layer-by-layer self-assembly technology can modify the membrane at the molecular level, control the composition, structure and thickness of the membrane, and is widely used in the field of functional thin film materials. [0003] Commonly used layer-by-layer self-assembled polycation electrolytes include polypropylene amine (PAH), polydiallyl dimethyl ammonium chloride (PDADMAC), chitosan, polyethyleneimine (PEI), etc., and polyanion electrolytes i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D69/12B01D69/02B01D71/68
CPCB01D61/027B01D67/0002B01D67/0011B01D69/02B01D69/125B01D71/68B01D2325/30B01D2325/48
Inventor 黄中华孙倩玉李梦坤李娜汤欣源欧阳志宇
Owner NANJING UNIV OF SCI & TECH
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