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A kind of forward osmosis composite membrane and its preparation method and application

A composite membrane and forward osmosis technology, which is applied in the field of membrane separation, can solve the problems of not slowing down the internal concentration polarization in the forward osmosis process, and achieve low mass transfer resistance and reduce the effect of internal concentration polarization

Active Publication Date: 2022-05-31
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this addition method cannot slow down the internal concentration polarization in the process of forward osmosis, because internal concentration polarization is one of the main factors that limit the increase of forward osmosis water flux

Method used

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  • A kind of forward osmosis composite membrane and its preparation method and application
  • A kind of forward osmosis composite membrane and its preparation method and application
  • A kind of forward osmosis composite membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of graphene oxide-based polyamide composite membrane:

[0036] 1) A polyethersulfone (PES) microfiltration membrane with an average pore size of 0.8 μm was used as a macroporous substrate, and was pretreated with 2 g / L of dopamine hydrochloride and a Tris buffer solution of pH=8.5 for 10 h.

[0037] 2) In order to obtain a graphene oxide (GO) modified membrane, a 30 ml GO solution with a size of 20 μm and a concentration of 0.004 mg / ml was deposited on the surface of the pretreated PES membrane by vacuum filtration under a pressure of 0.01 MPa. .

[0038]3) Using the above-mentioned PES film deposited on the graphene oxide (GO) layer as a support layer, an interfacial polymerization method is used to form a polyamide separation layer on the graphene oxide (GO) layer to obtain a composite film (that is, the graphene oxide in the composite film). (GO layer as the middle layer): First, the support layer was immersed in an aqueous solution containing 2 wt% m-ph...

Embodiment 2

[0045] Preparation of graphene oxide-based polyamide composite membrane:

[0046] 1) A polyethersulfone (PES) microfiltration membrane with an average pore size of 0.8 μm was used as a macroporous substrate, and was pretreated with 2 g / L of dopamine hydrochloride and a Tris buffer solution of pH=8.5 for 10 h.

[0047] 2) In order to obtain a graphene oxide (GO) modified membrane, a 30 ml GO solution with a size of 20 μm and a concentration of 0.0025 mg / ml was deposited on the surface of the pretreated PES membrane by vacuum filtration under a pressure of 0.01 MPa. .

[0048] 3) Using the above-mentioned PES film deposited on the graphene oxide (GO) layer as a support layer, an interfacial polymerization method is used to form a polyamide separation layer on the graphene oxide (GO) layer to obtain a composite film (that is, the graphene oxide in the composite film). (GO layer as the middle layer): First, the support layer was immersed in a 2 wt% m-phenylenediamine aqueous solu...

Embodiment 3

[0057] Preparation of graphene oxide-based polyamide composite membrane:

[0058] 1) A polyethersulfone (PES) microfiltration membrane with an average pore size of 0.8 μm was used as a macroporous substrate, and was pretreated with 2 g / L of dopamine hydrochloride and a Tris buffer solution of pH=8.5 for 10 h.

[0059] 2) In order to obtain a graphene oxide (GO) modified membrane, a 30 ml GO solution with a size of 20 μm and a concentration of 0.0025 mg / ml was deposited on the surface of the pretreated PES membrane by vacuum filtration under a pressure of 0.01 MPa. .

[0060] 3) Using the above-mentioned PES film deposited on the graphene oxide (GO) layer as a support layer, an interfacial polymerization method is used to form a polyamide separation layer on the graphene oxide (GO) layer to obtain a composite film (that is, the graphene oxide in the composite film). (GO layer as the middle layer): First, the support layer was immersed in a 2 wt% m-phenylenediamine aqueous solu...

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Abstract

The invention belongs to the technical field of membrane separation, and specifically relates to a forward osmosis composite membrane based on two-dimensional nanomaterials and a macroporous substrate, a preparation method and application thereof. The composite membrane deposits two-dimensional nanomaterials on the surface of the macroporous substrate as an intermediate layer, and forms a polyamide separation layer on the surface, which is the composite membrane. The interlayer of two-dimensional nanomaterials in the composite membrane of the present invention prevents the polyamide from penetrating into the macroporous substrate to destroy its original macropore and interpenetrating pore structure, reduces mass transfer resistance, and effectively alleviates the internal concentration difference in the forward osmosis process Polarization phenomenon, thus greatly improving the separation performance of polyamide composite membrane, can be widely used in seawater desalination, fruit juice concentration and other fields.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to a forward osmosis composite membrane based on a two-dimensional nanomaterial and a macroporous substrate, and a preparation method and application thereof. Background technique [0002] Forward osmosis (FO) is an emerging membrane separation technology in recent years. It is a membrane process driven by osmotic pressure difference or chemical potential difference. It has the advantages of low energy consumption, low pollution and high recovery rate. It shows great application potential in seawater desalination, wastewater treatment, pharmaceutical processing, food processing and other fields. The prospects are very broad. [0003] As the core of forward osmosis technology, membrane materials with high water flux and low reverse salt flux play a crucial role in separation performance. At present, most of the commonly used forward osmosis membranes are polyamide compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D61/00B01D67/00B01D69/12B01D71/02B01D71/16B01D71/26B01D71/48B01D71/56B01D71/64
CPCB01D71/56B01D71/68B01D71/16B01D71/48B01D71/26B01D71/64B01D71/021B01D71/02B01D71/024B01D69/12B01D67/0079B01D61/002Y02A20/131
Inventor 江河清宋向菊焦成丽
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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