Preparation method of polyethylene imine/sodium lignin sulfonate composite membrane

A technology of sodium lignosulfonate and polyethyleneimine, which is applied in the field of separation membranes, can solve the problems of low elasticity, high price, and high brittleness of organic nanofiltration membranes, achieve improved separation performance, simple membrane manufacturing process, and improved separation efficiency effect

Inactive Publication Date: 2017-10-20
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, inorganic nanofiltration membranes mainly include ceramic membranes, metal oxide membranes, etc., which have extremely good chemical stability, mechanical strength and biological tolerance, but organic nanofiltration membranes are brittle, less elastic, and expensive, so they are widely used. Applications

Method used

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  • Preparation method of polyethylene imine/sodium lignin sulfonate composite membrane
  • Preparation method of polyethylene imine/sodium lignin sulfonate composite membrane
  • Preparation method of polyethylene imine/sodium lignin sulfonate composite membrane

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Experimental program
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Embodiment 1~5

[0030] Pretreatment of the basement membrane: the polysulfone membrane was cut to a size of 14×14 cm and soaked in deionized water for 12 h. After soaking, immerse in 0.5 wt% NaOH aqueous solution, and keep in a constant temperature water bath at 50 °C for 1 h. Then the membrane was taken out and washed with deionized water until neutral. Drain the pretreated basement membrane with deionized water, seal it in a ziplock bag and store it in the refrigerator for later use;

[0031] Self-assembly of the polyelectrolyte composite layer: the four corners of the polysulfone base membrane were fixed on the bottom of the culture dish with waterproof tape, and the base membrane was cleaned with deionized water. Pour an appropriate amount of 0.15 wt% PEI solution into the Petri dish and let it stand for 30 min. Pour out the PEI solution and rinse it several times with deionized water to remove excess polyelectrolyte adsorbed by weak force on the surface of the membrane. Then pour abou...

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Abstract

The invention discloses a preparation method of a polyethylene imine / sodium lignin sulfonate composite membrane. The preparation method includes: using a polysulfone ultrafiltration membrane with an electronegative surface as the base membrane, polyethylene imine and sodium lignin sulfonate are sequentially self-assembled to the base membrane to form a self-assembled composite layer, and the self-assembled composite layer is allowed to form a structurally-stable composite layer through glutaraldehyde crosslinking. The preparation method has the advantages that the electrostatic interaction among electrolyte with different charges is utilized to allow cation and anion polyelectrolyte to attach to the surface of the polysulfone ultrafiltration membrane, and layer-by-layer self-assembling of the polyelectrolyte is achieved; when the number of polyelectrolyte double-layers is 7, and composite nanofiltration membrane has good separation performance.

Description

technical field [0001] The invention relates to a layer-by-layer self-assembled polyethyleneimine / sodium lignosulfonate composite nanofiltration membrane and a preparation method thereof, belonging to the technical field of separation membranes. Background technique [0002] Membrane separation technology is an emerging mixture separation technology, which uses the selective permeability of the membrane to each component in the mixture to separate, purify, concentrate and enrich the target product with external energy or chemical potential difference as the driving force. Compared with traditional separation methods, membrane separation technology has the advantages of mild separation conditions, low energy consumption, continuous separation, easy industrial scale-up, simple operation, high operational stability, and no pollution. There are many types of membrane separation technologies, which can be divided into microfiltration, ultrafiltration, nanofiltration and reverse o...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/64B01D71/74B01D69/02B01D69/12B01D67/00B01D61/02
Inventor 代娟刘旺衢王璐莹雷建都
Owner BEIJING FORESTRY UNIVERSITY
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