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Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and composite technology, applied in the field of nanofiltration membranes, can solve the problems affecting the processing capacity and flux of nanofiltration membranes, etc.

Active Publication Date: 2017-11-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when graphene oxide is used as a nanofiltration membrane, its flux is not good, which affects the processing capacity of the nanofiltration membrane.

Method used

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  • Composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0037] The present invention also provides the preparation method of above-mentioned composite nanofiltration membrane, comprises the following steps:

[0038] a) dissolving the bacterial cellulose in an amide solvent, and vacuum filtering to obtain a bacterial cellulose film;

[0039] Filtrating the diamine solution on the bacterial cellulose membrane, so that part of the diamine molecules are retained on the surface of the bacterial cellulose basement membrane to obtain the bacterial cellulose basement membrane;

[0040] b) Grinding and acid-treating the natural attapulgite to obtain attapulgite;

[0041] Mix attapulgite with water to obtain attapulgite solution;

[0042] c) mixing the attapulgite solution with an aqueous solution of graphene oxide, and vacuum filtering the resulting mixed solution on the surface of the bacterial cellulose basement membrane to obtain a composite nanofiltration membrane;

[0043] Step a) and step b) are not limited in order.

[0044] Accor...

Embodiment 1

[0058] Bacterial cellulose (provided by Guilin Qihong Technology Co., Ltd., the product model is QHBC) is dissolved in formamide and vacuum filtered to obtain a bacterial cellulose basement membrane; filter the ethylenediamine solution on the resulting bacterial cellulose basement membrane , so that part of the ethylenediamine molecule is trapped on the surface of the bacterial cellulose basement membrane to obtain the intermediate membrane.

[0059] Put the natural attapulgite into a ball mill jar with a ball-to-material ratio of 3:1, grind it at 400rpm for 4 hours, and the average particle size of the grinding is 5μm; mix it with 10mL hydrochloric acid (concentration 4M): 1g attapulgite for acid treatment. React at 80°C for 4 hours, then wash with deionized water until neutral to obtain attapulgite; mix attapulgite with deionized water, and ultrasonically treat for 2 hours to prepare a 4 g / L attapulgite solution. Fully mix graphene oxide and deionized water to prepare a 0.1g...

Embodiment 2

[0062] Bacterial cellulose (by Guilin Qihong Technology Co., Ltd., product model QHBC) was dissolved in N,N-dimethylacetamide and vacuum filtered to obtain bacterial cellulose basement membrane; The butanediamine solution is filtered on the upper surface, so that part of the butanediamine molecules are retained on the surface of the bacterial cellulose basement membrane to obtain an intermediate membrane.

[0063] Put the natural attapulgite into a ball mill jar with a ball-to-material ratio of 3:1, grind it at 400rpm for 4 hours, and the average particle size of the grinding is 5μm; mix it with 10mL hydrochloric acid (concentration 4M): 1g attapulgite for acid treatment. React at 80°C for 4 hours, then wash with deionized water until neutral to obtain attapulgite; mix attapulgite with deionized water, and ultrasonicate for 2 hours to prepare a 2 g / L attapulgite solution. Fully mix graphene oxide and deionized water to prepare a 0.1g / L graphene oxide solution; mix the obtained...

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Abstract

The invention provides a composite nanofiltration membrane and a preparation method thereof. The composite nanofiltration membrane comprises a bacterial cellulose base membrane and a graphene oxide compound compounded to the surface of the bacterial cellulose base membrane. The bacterial cellulose base membrane is a diamine-modified bacterial cellulose membrane. The graphene oxide compound comprises graphene oxide and attapulgite dispersed between the graphene oxide layers. Compared with graphene oxide, the composite nanofiltration membrane ensures the retention rate and greatly improves the throughput of the nanofiltration membrane. The composite nanofiltration membrane is a self-supporting nanofiltration membrane with high mechanical strength.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane belongs to separation membrane, which is a kind of functional semi-permeable membrane that allows solvent molecules or certain low molecular weight solutes or low-valent ions to pass through. The molecular weight cut-off is generally between reverse osmosis membrane and ultrafiltration membrane. Nano-scale substances, so called "nanofiltration". In addition, nanofiltration membranes also have the characteristics of low operating pressure, stability, easy cleaning and long life, so they have very broad application prospects in the fields of food, medicine, drinking water, domestic and industrial sewage treatment; for example, nanofiltration membranes can be used for Remove organic matter, pigment, groundwater hardness and some dissolved salt...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00
CPCB01D67/0079B01D69/12
Inventor 方齐乐周旭峰刘兆平罗忠青
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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