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Preparation method of multifunctional nano-crystalline cellulose composite separation filter membrane and application thereof

A nano-cellulose, multi-functional technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of high preparation cost, complicated preparation process, difficult to handle, etc., and achieve low cost and simple preparation process Effect

Inactive Publication Date: 2018-05-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of polymer separation membranes usually requires the use of harmful reagents and coagulants to achieve phase transition, and the preparation process is complex, while ceramic membranes are heavy and difficult to handle, requiring modification and modification, and the preparation cost is high

Method used

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  • Preparation method of multifunctional nano-crystalline cellulose composite separation filter membrane and application thereof
  • Preparation method of multifunctional nano-crystalline cellulose composite separation filter membrane and application thereof
  • Preparation method of multifunctional nano-crystalline cellulose composite separation filter membrane and application thereof

Examples

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Effect test

Embodiment 1

[0032] The composite nanocellulose aqueous dispersion with a mass ratio of nanocellulose to attapulgite of 1:1 is suction-filtered into a 0.34 g m -2 The nanocellulose membrane obtained. The membrane was used for oil-water emulsion separation test to separate micron-sized soybean oil emulsion. The mass ratio of soybean oil to water is 1:99. The membrane is conducive to demulsification, effectively retains emulsified oil droplets, and achieves the purpose of oil-water separation. The separation efficiency of the filter membrane is 99.9%, and the flow rate is 140.8±17.2L m -2 h -1 ·MPa -1 .

Embodiment 2

[0034] The composite nanocellulose aqueous dispersion whose mass ratio between nanocellulose and attapulgite is 1:1 is made into 1.36g m -2 nanocellulose membrane. Use this membrane to carry out the oil-water emulsion separation test, to separate the nano-scale soybean oil emulsion, first make a micron-scale emulsion with a mass ratio of soybean oil to water of 1:99, dilute it by 100 times and then process it into a nano-scale soybean oil emulsion. The film has It is conducive to demulsification, effectively intercepts emulsified oil droplets, and achieves the purpose of oil-water separation. The separation efficiency of the filter membrane is 99.9%, and the flux is 1765.9±61.5L m -2 h -1 ·MPa -1 .

Embodiment 3

[0036] The composite nanocellulose aqueous dispersion whose mass ratio between nanocellulose and attapulgite is 1:1 is made into 1.36g m -2 nanocellulose membrane. Use this membrane to carry out the oil-water emulsion separation test, to separate the nano-scale hexane emulsion, first make a micro-scale emulsion with a mass ratio of hexane to water of 1:99, dilute it by 15 times and then process it into a nano-scale hexane emulsion. The membrane has It is conducive to demulsification, effectively intercepts emulsified oil droplets, and achieves the purpose of oil-water separation. The separation efficiency of the filter membrane is 99.9%, and the flow rate is 2264.4±61.5L m -2 h -1 ·MPa -1 .

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Abstract

The invention discloses a preparation method of a multifunctional nano-crystalline cellulose composite separation filter membrane and application thereof. The method comprises the following steps: adding attapulgite into nano-crystalline cellulose suspension to be mixed, and preparing nano cellulose crystal / attapulgite suspension. An ordinary filter membrane serves as a substrate, and the suspension is subjected to vacuum filtration to form the filter membrane. According to the filter membrane, the pore size, thickness and water flux of the membrane can be controlled by regulating the usage amount of cellulose in unit area. According to the wettability characteristic that the filter membrane is super-hydrophilic and is super-oleophobic in oil, application of the filter membrane in aspectssuch as oil-water emulsion, heavy metals and dye separation is realized. The filter membrane disclosed by the invention is simple, feasible, low in cost and non-toxic.

Description

technical field [0001] The invention relates to a preparation method of a multifunctional nano-cellulose composite separation filter membrane and its separation application, belonging to the fields of chemical engineering and polymer functional materials. Background technique [0002] Oily wastewater is one of the common sources of environmental pollution, which seriously threatens human health and social development. Both water treatment and oil recovery require effective separation of oily wastewater. Oils are divided into slick oil, dispersed oil, and emulsified oil according to the different states of existence in oily wastewater. Traditional oil-water separation methods such as gravity separation, centrifugal separation, flotation, and coarse-graining methods can only effectively separate floating oil and dispersed oil, while emulsified oil is in a stable state and the oil droplet size is small (less than 10 μm) and it is difficult to be separated. effective separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D67/00C02F1/44C02F101/20
CPCB01D67/0079B01D71/10C02F1/44C02F2101/20C02F2101/308
Inventor 常春雨詹慧陶荣军张俐娜
Owner WUHAN UNIV
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