Hybridized composite reverse osmosis membrane containing carbon nano tubes and preparation method thereof

A technology of reverse osmosis composite membrane and carbon nanotubes, which is applied in the field of hybrid reverse osmosis composite membrane and its preparation, can solve the problems of reducing membrane rejection rate and difficult to achieve fundamental changes, etc.

Inactive Publication Date: 2010-08-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Judging from the existing research, the synthesis of new monomers is usually to introduce some new functional groups, or to improve the cross-linking structure, etc., which can only partially improve the performance of the membrane, and it is difficult to achieve fundamental changes. Variety
In addition, since the separation layer of the polyamide membrane is an ultra-thin layer, it is difficult to reduce the transfer resistance by reducing the membrane thickness, and reducing the crosslinking degree of the polyamide layer to increase the membrane flux will inevitably reduce the membrane rejection rate

Method used

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  • Hybridized composite reverse osmosis membrane containing carbon nano tubes and preparation method thereof
  • Hybridized composite reverse osmosis membrane containing carbon nano tubes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of aqueous phase solution A: dissolving and dispersing m-phenylenediamine and multi-walled carbon nanotubes in water, ultrasonicating for a period of time to make them disperse evenly, and preparing m-phenylenediamine with a mass percentage concentration of 2%, more An aqueous phase solution A with a mass percent concentration of walled carbon nanotubes of 0.005%;

[0035] (2) Preparation of organic phase solution B: dissolving trimesoyl chloride in n-hexane, and ultrasonically stirring to prepare an organic phase solution B with a mass percent concentration of trimesoyl chloride of 0.2%;

[0036] (3) Immerse the polysulfone support membrane in the aqueous phase solution A for 20 minutes to remove the aqueous phase solution remaining on the surface of the polysulfone support membrane, then immerse the bottom membrane in the organic phase solution B and maintain it for 40 seconds to remove the remaining residue on the surface of the membrane. The organic ...

Embodiment 2-3

[0040] Except that the concentration of multi-walled carbon nanotubes in the aqueous solution A is adjusted, all the other operations are the same as in Example 1, and a hybrid reverse osmosis composite membrane containing carbon nanotubes is prepared, and the prepared hybrid reverse osmosis composite membrane The performance test results are shown in Table 1.

Embodiment 4-7

[0049] (1) Preparation of aqueous phase solution A: dissolving and dispersing m-phenylenediamine in water, ultrasonicating for a period of time to make it uniformly dispersed, and preparing aqueous phase solution A;

[0050] (2) Preparation of organic phase solution B: dissolving trimesoyl chloride and multi-walled carbon nanotubes in n-hexane, ultrasonic stirring, and preparing organic phase solution B;

[0051] The rest of the operations were the same as in Example 1 to prepare a hybrid reverse osmosis composite membrane containing carbon nanotubes. The performance test results of the prepared hybrid reverse osmosis composite membrane are shown in Table 2.

[0052] Table 2

[0053]

trimesoyl chloride

(wt%)

Multi-walled carbon nano

Tube (wt%)

pure water flux

(L / (m 2 h))

Retention rate

(%)

Example 4

0.2

0.005

27.42

91.38

Example 5

0.2

0.01

34.56

89.34

Example 6

0.2...

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Abstract

The invention discloses a hybridized composite reverse osmosis membrane containing carbon nano tubes and a preparation method thereof. The preparation method comprises the following steps of: adding the carbon nano tubes to a monomer solution for synthesizing a polyamide membrane; and preparing the hybridized composite reverse osmosis membrane containing the carbon nano tubes through an immersion method. The hybridized reverse osmosis composite membrane keeps the retention rate of a reverse osmosis membrane and also greatly increases the flux of the membrane by utilizing unique microcellular structures and good water channel action of the carbon nano tubes, and finally the reverse osmosis membrane with high flux and retention rate is prepared.

Description

technical field [0001] The invention relates to the field of reverse osmosis composite membranes, in particular to a hybrid reverse osmosis composite membrane containing carbon nanotubes and a preparation method thereof. Background technique [0002] As one of the earliest industrialized membrane technologies, reverse osmosis has been widely used in the field of seawater desalination. At present, the global daily output of fresh water prepared by reverse osmosis is about 2×10 7 Ton. Reverse osmosis membrane is the core content of reverse osmosis technology. With the increasingly serious problem of water resources, the application of reverse osmosis technology in the field of water treatment will become more and more extensive. It is gradually expanding from the field of seawater desalination to wastewater treatment and other fields. Improvements to existing reverse osmosis membranes. In recent years, on the basis of traditional reverse osmosis membranes, some new reverse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D71/02B01D71/68B01D61/08
Inventor 张林施国忠邱实周志军陈欢林
Owner ZHEJIANG UNIV
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