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Graphene oxide modified high-temperature ultrafiltration composite membrane and preparation method thereof

An ultrafiltration composite membrane, graphene modification technology, applied in chemical instruments and methods, ultrafiltration, membranes and other directions, can solve the problems of membrane flux decline, unstable graphene oxide layer structure, etc., to improve the removal rate, The effect of improving anti-pollution performance and ensuring stability

Active Publication Date: 2017-07-14
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing graphene oxide surface modified ultrafiltration membranes, such as obvious decline in membrane flux after modification, unstable graphene oxide layer structure, etc., and further improve the removal of dissolved organic matter by ultrafiltration membranes rate and pollution resistance

Method used

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  • Graphene oxide modified high-temperature ultrafiltration composite membrane and preparation method thereof
  • Graphene oxide modified high-temperature ultrafiltration composite membrane and preparation method thereof
  • Graphene oxide modified high-temperature ultrafiltration composite membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) The polyvinylidene fluoride (PVDF) ultrafiltration membrane is immersed in a mixture of 1mol / L potassium hydroxide and 0.25g of tetrabutylammonium fluoride for activation for 15min, then the membrane is taken out and directly immersed in 1mol / L In the mixed solution of sodium bisulfite and 0.1g concentrated sulfuric acid for 15 minutes, an activated membrane with hydroxyl functional groups on the membrane surface is obtained.

[0024] (2) Immerse the activated membrane in the trimesoyl chloride solution for 5 minutes, take it out and rinse with ultrapure water several times, and graft the trimesic chloride to the surface of the activated membrane.

[0025] (3) A graphene oxide solution with a size of 10-50 μm and a concentration of 200 mg / L was prepared, and the solution was sonicated at a frequency of 100 kHz for 20 minutes to obtain a uniformly dispersed GO solution. The film with trimesoyl chloride on the surface is immersed in the graphene oxide solution for 5 minute...

Embodiment 2

[0031] Based on the modification method in Example 1, the only difference is that in step (6), the membrane is repeatedly immersed in ethylenediamine solution and graphene oxide solution 14 times to obtain PVDF / GO-containing 15 graphene oxide layers. 15 Composite membrane.

[0032] The test data of the modified GO / PVDF composite membrane and PVDF ultrafiltration membrane in Example 1-2 are shown in Table 1. It can be seen from the table that as the number of grafted layers of graphene oxide increases, the contact angle of the membrane decreases and the Zeta potential increases, indicating that the modified GO / PVDF composite membrane has increased hydrophilicity and enhanced charging. Although the membrane flux of the modified membrane decreases with the increase in the number of graphene oxide layers, when the graphene oxide is loaded with 15 layers, the membrane flux can still reach 3750kg / m 2 h.

[0033] Table 1

[0034]

[0035] figure 1 with figure 2 The commercial ultrafiltra...

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Abstract

The invention discloses a graphene oxide modified high-temperature ultrafiltration composite membrane and a preparation method thereof. The high-temperature ultrafiltration composite membrane is prepared through a chemical immersion method and a layer-by-layer assembling method by utilizing a graphene oxide modified commercial polyvinylidene fluoride ultrafiltration membrane. The preparation method comprises the following modification steps: activating the polyvinylidene fluoride ultrafiltration membrane; immersing in a trimesoyl chloride solution and grafting an acyl chloride group; immersing in a graphene oxide solution; and circularly and alternately immersing in an ethylenediamine solution and the graphene oxide solution to enable graphene oxide to be connected through an ethylenediamine cross-linking agent, and forming a lamellar structure on the surface of the membrane so as to obtain the graphene oxide composite membrane with different layer quantities. The graphene oxide modified high-temperature ultrafiltration composite membrane prepared by the preparation method has the advantages of high flux, high anti-pollution property and high pollutant removing rate; and the water flux can reach 3750kg / m<2>h to 10150kg / m<2>h and the removing rate of soluble organic matters is 36.5%-68% and is improved by 15% when being compared with that of an ultrafiltration membrane before modification.

Description

Technical field [0001] The invention relates to a graphene oxide modified high-performance ultrafiltration composite membrane and a preparation method thereof. In particular, it relates to a method for preparing a high-performance composite membrane. Background technique [0002] Membrane separation technology, as a new separation technology in the 20th century, has the advantages of no secondary pollution, high separation efficiency, and less floor space. Membrane separation technology includes microfiltration, ultrafiltration, reverse osmosis, nanofiltration, forward osmosis, etc. Among them, ultrafiltration technology has the advantages of low energy consumption and high removal rate of suspended solids, colloids, pathogens and other particulate matter in the water. The scope of water treatment industry is widely used. Currently commonly used ultrafiltration membrane materials mainly include polysulfone, polyethersulfone, polyvinyl chloride, polyvinylidene fluoride and so on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00B01D61/14C02F1/44C02F101/30
CPCB01D61/145B01D67/0079B01D69/12B01D71/34B01D2311/2626B01D2325/36C02F1/444C02F2101/30
Inventor 杨禹赵旌晶李媛侯立安
Owner BEIJING NORMAL UNIVERSITY
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