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Forward osmosis composite membrane and preparation method and application thereof

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: 2020-12-04
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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  • Forward osmosis composite membrane and preparation method and application thereof
  • Forward osmosis composite membrane and preparation method and application thereof
  • Forward osmosis composite membrane and preparation method and application thereof

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 pretreated with 2 g / L dopamine hydrochloride and a Tris buffer solution with pH=8.5 for 10 h.

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

[0038]3) With the PES film of the above-mentioned deposited 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, graphene oxide in the composite film (GO) layer as an intermediate layer): first, the support layer is soaked in an aqueous solution containing 2wt% m-...

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 pretreated with 2 g / L dopamine hydrochloride and a Tris buffer solution with pH=8.5 for 10 h.

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

[0048] 3) With the PES film of the above-mentioned deposited 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, graphene oxide in the composite film (GO) layer as the middle layer): First, soak the supporting layer in 2wt% m-phenylenediamine aqueous solution for 2 minutes, pou...

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 pretreated with 2 g / L dopamine hydrochloride and a Tris buffer solution with pH=8.5 for 10 h.

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

[0060] 3) With the PES film of the above-mentioned deposited 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, graphene oxide in the composite film (GO) layer as the middle layer): First, soak the supporting layer in 2wt% m-phenylenediamine aqueous solution for 2 minutes, pou...

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Abstract

The invention belongs to the technical field of membrane separation, and particularly relates to a forward osmosis composite membrane based on a two-dimensional nano material and a macroporous substrate and a preparation method and application of the forward osmosis composite membrane. According to the composite membrane, a two-dimensional nano material is deposited on the surface of a macroporoussubstrate to serve as a middle layer, a polyamide separation layer is formed on the surface of the middle layer, and the composite membrane is obtained. The two-dimensional nano material middle layerin the composite membrane prevents polyamide from permeating into the macroporous substrate to damage the original macroporous and mutually communicated pore structure, reduces the mass transfer resistance, and effectively relieves the internal concentration polarization phenomenon in the forward osmosis process, thereby greatly enhancing the separation performance of the polyamide composite membrane and prolonging the service life of the composite membrane. The forward osmosis composite membrane can be widely applied to seawater desalination, juice concentration and other fields.

Description

technical field [0001] 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. 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 has shown great application potential in the fields of seawater desalination, wastewater treatment, pharmaceutical processing, and food processing. The prospects are very bright. [0003] As the core of forward osmosis technology, membrane materials with high water flux and low reverse salt flux play a vital role in the separation performance. At present, most of the commonly used forward osmosis membranes are ...

Claims

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Application Information

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Patent Type & Authority Applications(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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