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Preparation method of antibacterial cellulose flat nanofiltration membrane

A cellulose and nanofiltration membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of nanofiltration membranes that are difficult to biodegrade petrochemical products, little research, human economy, environment and resource burden, etc. Achieve the effects of high water flux, low cost and simple preparation process

Active Publication Date: 2017-03-08
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Because cellulose is the oldest and most abundant renewable and biodegradable natural polymer material on earth, a lot of research has been done on the preparation of microfiltration membranes, ultrafiltration membranes, and reverse osmosis membranes from natural cellulose at home and abroad. However, there is little research on the preparation of nanofiltration membranes; most of the existing commercialized nanofiltration membranes are petrochemical products that are difficult to biodegrade, which has caused a huge burden on human economy, environment and resources

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  • Preparation method of antibacterial cellulose flat nanofiltration membrane

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preparation example Construction

[0022] A kind of preparation method of antibacterial cellulose flat nanofiltration membrane of the present invention, this preparation method comprises following specific operation steps:

[0023] (1), preparation of cellulose casting solution: under the condition of 80°C-110°C, configure N-methylmorpholine-N-oxide solvent with a water content of 10%-16%, and then in the N-methyl Adding n-propyl gallate and nano-SiO to the morpholine-N-oxide solvent 2 porogen, and nano-TiO 2 Antibacterial agent or nano-silver antibacterial agent, finally add cellulose pulp; then stir and dissolve, after the dissolution is complete, vacuum degassing or static degassing for 5-8 hours, then obtain a uniform and transparent cellulose casting solution;

[0024] Wherein, the addition amount of n-propyl gallate is 0.2%-0.3% of the solvent content of N-methylmorpholine-N-oxide; the addition amount of cellulose pulp is N-methylmorpholine-N-oxide 4%-8% of solvent content; nano-SiO 2 The amount of por...

Embodiment 1

[0032] Under the condition of 110°C, configure N-methylmorpholine-N-oxide solvent with a water content of 13.3%, and then add n-propyl gallate, nano SiO 2 porogen, and nano-TiO 2 Antibacterial agent, finally add cellulose pulp (wherein, the addition of n-propyl gallate is 0.25% of N-methylmorpholine-N-oxide solvent content; The addition of cellulose pulp is N-methyl 4% of morpholine-N-oxide solvent content; nano-SiO 2 The addition of porogen is 1.8% of the content of cellulose pulp; nano TiO 2 The addition of the antibacterial agent is 0.5% of the content of the cellulose pulp); then stirring and dissolving, after the dissolution is complete, vacuum degassing or static degassing for 5 hours, then obtain a uniform and transparent cellulose casting solution;

[0033] At a constant temperature of 80°C, the obtained cellulose casting solution is evenly coated on the non-woven fabric to obtain a cellulose primary film; then the obtained cellulose primary film is put into deioniz...

Embodiment 2

[0036] Under the condition of 105°C, configure N-methylmorpholine-N-oxide solvent with a water content of 10%, and then add n-propyl gallate, nano SiO 2 porogen, and nano-TiO 2Antibacterial agent, finally add cellulose pulp (wherein, the addition of n-propyl gallate is 0.3% of N-methylmorpholine-N-oxide solvent content; The addition of cellulose pulp is N-methyl 5% of morpholine-N-oxide solvent content; nano-SiO 2 The amount of porogen added is 1% of the content of cellulose pulp; nano-TiO 2 The antibacterial agent is added in an amount of 0.2% of the cellulose pulp content); followed by stirring and dissolving, after the dissolution is complete, vacuum degassing or static degassing for 7 hours, then obtain a uniform and transparent cellulose casting solution;

[0037] At a constant temperature of 90°C, the obtained cellulose casting solution is evenly coated on the non-woven fabric to obtain a cellulose primary film; then the obtained cellulose primary film is put into dei...

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Abstract

The invention provides a preparation method of an antibacterial cellulose flat nanofiltration membrane. An N-methylmorpholine-N-oxide solvent with moisture content of 10%-16%, propyl gallate, a nanometer SiO2 pore-foaming agent, a nanometer TiO2 antibacterial agent (or a nanometer silver antibacterial agent) and cellulose pulp serve as raw materials, and a homogenous and transparent cellulose membrane casting solution is prepared; sequentially an antibacterial porous cellulose membrane is prepared by means of the immersion gel method; afterwards a poly piperazine aqueous solution and an N-hexane organic solution containing trimesoyl chloride are prepared, operation is conducted to make a crosslinking product obtained by polymerization of poly piperazine and trimesoyl chloride uniformly attached to membrane holes and membrane surfaces, and finally the antibacterial cellulose flat nanofiltration membrane is obtained. The whole preparation process is simple, cost is low, the prepared antibacterial cellulose flat nanofiltration membrane can be used for removing multivalent ions, a part of salts with monovalent ions and organics with molecular weight larger than 300, and has the advantages of being high in retention and water flux, selective in adsorption and friendly to the environment.

Description

[0001] 【Technical field】 [0002] The invention relates to a preparation method of a nanofiltration membrane, in particular to a preparation method of an antibacterial cellulose flat nanofiltration membrane. [0003] 【Background technique】 [0004] Because membrane separation technology has the functions of separation, concentration, purification and refining, and has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control, etc., it is widely used in drinking water purification, seawater desalination, urban sewage, industrial wastewater It has obvious advantages in the treatment and disposal of materials and the separation of substances, and it has gained more and more attention all over the world. [0005] Nanofiltration membrane is one of the most widely used membrane separation technologies. It is a charged membrane with a membrane pore size between the ultrafiltration membrane...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/06B01D69/02B01D67/00B01D61/02C02F1/44C02F101/10C02F101/12C02F101/34C02F101/38
CPCB01D61/027B01D67/0079B01D69/02B01D69/06B01D71/10B01D2325/48
Inventor 黄六莲陈礼辉李诗翁仁贵林珊曹石林肖禾
Owner FUJIAN AGRI & FORESTRY UNIV
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