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Nanometer crystal cellulose composite antioxidant nano-filtration membrane and method for preparing same

A nanocrystalline cellulose, antioxidant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of mild reaction conditions

Active Publication Date: 2016-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water flux and desalination rate of the composite membrane were improved, but the antioxidant performance was not improved

Method used

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  • Nanometer crystal cellulose composite antioxidant nano-filtration membrane and method for preparing same
  • Nanometer crystal cellulose composite antioxidant nano-filtration membrane and method for preparing same
  • Nanometer crystal cellulose composite antioxidant nano-filtration membrane and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Get 2g of microcrystalline cellulose and place it in a container, add 20mL of sulfuric acid aqueous solution with a mass concentration of 64% dropwise into the microcrystalline cellulose, keep the temperature of the mixture at 0°C in an ice bath, and cool the mixture with a constant temperature water bath after the addition is completed. The temperature was raised to 45°C, and the reaction was stirred for 4h.

[0038] The above reacted mixture is slowly poured into ten times the volume of ultrapure water for dilution, and centrifuged and washed three times. The obtained product is dialyzed through a dialysis bag until the solution is neutral, and finally freeze-dried to obtain nanocrystalline cellulose powder.

[0039]The prepared nanocrystalline cellulose was added to 6 mL of piperazine aqueous solution with a concentration of 1 g / L so that the concentration of nanocrystalline cellulose in the piperazine aqueous solution was 3.6 g / L, and ultrasonicated for 30 min at roo...

Embodiment 2～4

[0042] Adjust the concentration of the water phase monomer piperazine and the oil phase monomer trimesoyl chloride, the concentration of nanocrystalline cellulose is 3.6g / L unchanged, and the rest of the conditions are the same as in Example 1.

[0043] The scanning electron micrograph of the antioxidant nanofiltration membrane prepared in embodiment 3 is as follows figure 1 shown.

Embodiment 5～10

[0050] Adjust the concentration of nanocrystalline cellulose in the aqueous phase solution, the concentration of piperazine in the aqueous phase solution is 0.3g / L, the concentration of trimesoyl chloride in the oil phase solution is 0.3g / L, and the rest of the conditions are the same as in Example 2.

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Abstract

The invention discloses a nanometer crystal cellulose composite antioxidant nano-filtration membrane and a method for preparing the same. The method includes carrying out interfacial polymerization on porous support membranes by the aid of water-phase monomers and oil-phase monomers; forming a nanometer crystal cellulose composite aromatic polymer functional skin layer on each porous support membrane to obtain the nanometer crystal cellulose composite antioxidant nano-filtration membrane. The nanometer crystal cellulose composite antioxidant nano-filtration membrane and the method have the advantages that nanometer crystal celluloses are compounded in the aromatic polymer functional skin layers of the nanometer crystal cellulose composite antioxidant nano-filtration membrane, the surfaces of the nanometer crystal celluloses contain a large quantity of hydroxyl, and accordingly the water flux of the nanometer crystal cellulose composite antioxidant nano-filtration membrane can be greatly improved; ester bonds can be formed by the hydroxyl of the surfaces of the nanometer crystal celluloses in interfacial polymerization procedures and can stably exist in sodium hypochlorite, and accordingly the nanometer crystal cellulose composite antioxidant nano-filtration membrane is difficult to oxidize in acid pickling procedures and is excellent in antioxidant activity; procedures for preparing the nanometer crystal cellulose composite antioxidant nano-filtration membrane are easy to implement, reaction conditions are mild, and accordingly the nanometer crystal cellulose composite antioxidant nano-filtration membrane and the method have excellent industrial production bases and broad application prospects.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a nanocrystalline cellulose composite anti-oxidation nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of membrane separation technology, and the pore size of the nanofiltration membrane is in the range of nanometers. The composite nanofiltration membrane is mainly composed of three parts: a separation layer, a support layer and a base membrane, and the separation layer is a functional layer that plays a role in separation. Composite nanofiltration membranes can be used in water softening, food processing, dye removal, wastewater treatment and other fields. They have broad application prospects and have attracted extensive attention from membrane material manufacturers and research institutions. [0003] At present, the formation of aromatic polymer functional skin by interfacial polymerization is the main meth...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D69/12B01D69/10
CPCB01D67/0002B01D67/0006B01D69/02B01D69/10B01D69/105B01D69/125
Inventor 徐志康林福文王静静郭毅吴铭榜杨皓程
Owner ZHEJIANG UNIV
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