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Solvent-resistant, corrosion-resistant and high-flux composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane, corrosion-resistant technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of poor tolerance, low solvent flux, etc., to achieve good tolerance, high solvent flux, The effect of high flux of organic solvents

Active Publication Date: 2016-10-12
TSINGHUA UNIV
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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 provide a solvent-resistant, acid and alkali corrosion-resistant high-throughput nanofiltration membrane and its preparation method, which solves the problem that the nanofiltration membrane prepared by the existing method has poor tolerance to organic solvents and corrosive chemical environments, and the solvent low throughput problem

Method used

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  • Solvent-resistant, corrosion-resistant and high-flux composite nanofiltration membrane and preparation method thereof
  • Solvent-resistant, corrosion-resistant and high-flux composite nanofiltration membrane and preparation method thereof
  • Solvent-resistant, corrosion-resistant and high-flux composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, preparation graphene composite nanofiltration membrane

[0042] 1. Preparation of reduced graphene oxide:

[0043] 1.1 Use Hummers to prepare graphene oxide aqueous solution. For the preparation method, refer to L.Huang, Y.R.Li, Q.Q.Zhou, W.J.Yuan, G.Q.Shi, Adv.Mater., 2015, 27, 3797-3802.

[0044] 1.2 Measure the mass-volume concentration of the graphene oxide aqueous solution prepared in step 1.1 to be 7.0 g / L.

[0045] 1.3 Add water to the graphene oxide aqueous solution prepared in step 1.1, and dilute it into a graphene oxide aqueous solution with a concentration of 0.25 g / L.

[0046] 1.4 Take 20 mL of the graphene oxide aqueous solution prepared in step 1.3, add 78.4 μL of ammonia water (mass fraction 25 wt%), and then add 7.07 μL of hydrazine hydrate (mass fraction 99 wt%), at this time, the mass ratio of graphene oxide to hydrazine hydrate is 1 : 0.71, mix well and pour into 30ml glass bottle. Put the sealed glass bottle into a 40°C oven and hea...

Embodiment 2

[0055] Embodiment 2, preparation graphene composite nanofiltration membrane

[0056] 1. Preparation of reduced graphene oxide:

[0057] Prepared according to the method in Example 1.

[0058] 2. Take 0.2mL rGO solution (the mass-volume concentration of rGO is 0.25mg / mL), dilute to 25mL with 0.1wt% ammonia water, and the mass-volume concentration of rGO in the mixed solution is 2.0μg / mL, and then It is poured into a suction filter bottle that is cushioned with a porous microfiltration membrane, and is vacuum filtered so that the reduced graphene oxide is deposited on the microfiltration membrane. The porous microfiltration membrane is a nylon microfiltration membrane with a diameter of 50 mm and a pore size of 0.65 μm.

[0059] 3. When the water in the rGO aqueous solution in step 2 has just been pumped out, the suction filtration is stopped immediately, and the solvated reduced graphene oxide composite nanofiltration membrane is obtained.

[0060] 4. Preserve the composite ...

Embodiment 3

[0065] Embodiment 3, preparation graphene composite nanofiltration membrane

[0066] 1. Preparation of reduced graphene oxide:

[0067] Prepared according to the method in Example 1.

[0068] 2. Take 0.15mL rGO solution (the mass-volume concentration of rGO is 0.25mg / mL), dilute to 25mL with 0.1wt% ammonia water, and the mass-volume concentration of rGO in the mixed solution is 1.5μg / mL, and then It is poured into a suction filter bottle that is cushioned with a porous microfiltration membrane, and is vacuum filtered so that the reduced graphene oxide is deposited on the microfiltration membrane. The porous microfiltration membrane is an anodized aluminum porous membrane with a diameter of 47 mm and a pore size of 0.22 μm.

[0069] 3. When the water in the rGO aqueous solution in step 2 has just been pumped out, the suction filtration is stopped immediately, and the solvated reduced graphene oxide composite nanofiltration membrane is obtained.

[0070] 4. Preserve the compo...

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Abstract

The invention discloses a solvent-resistant, corrosion-resistant and high-flux composite nanofiltration membrane and a preparation method thereof. The method comprises steps as follows: a mixed liquid of a reduced graphene oxide aqueous solution and ammonia water A flows through a porous supporting membrane, reduced graphene oxide is deposited on the porous supporting membrane, and the composite nanofiltration membrane is obtained; the mixed liquid flows through the porous supporting membrane under the action of pressure. According to the method, the preparation process is simple and easy to implement, the cost is relatively low, the porous supporting membrane used in the method is a microfiltration membrane at the relatively low price, and, however, ultrafiltration membranes in the relatively high price are frequently used in the prior art. A graphene composite nanofiltration membrane organic solvent prepared with the method is high in flux and has the organic dye rejection rate close to 100%. A separation layer of the graphene composite nanofiltration membrane prepared with the method comprises solvated graphene and has very good resistance to various organic solvents and corrosive chemical environments.

Description

technical field [0001] The invention relates to a solvent-resistant and corrosion-resistant high-flux composite nanofiltration membrane and a preparation method thereof, belonging to the field of membrane technology. Background technique [0002] In the chemical and pharmaceutical industries, it is often necessary to separate and purify products or recover catalysts from organic solution media. Traditional separation and purification techniques, such as evaporative concentration and distillation, consume a lot of energy and require a lot of space for equipment. Therefore, the cost of the separation and purification process usually accounts for 40-70% of the entire investment and operating costs. The organic solvent nanofiltration (OSN) membrane separation technology developed in recent years is not only simple and efficient, but also has no phase change in the separation process and can be carried out at room temperature. In addition, OSN membrane separation equipment can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/00
CPCB01D61/027B01D67/0039B01D69/12B01D2325/30
Inventor 石高全黄亮高天天李春
Owner TSINGHUA UNIV
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