Graphene oxide composite film with hydrophobic two-dimensional pore channels and preparation method of graphene oxide composite film

Abstract

The invention discloses a preparation method of a graphene oxide composite film with hydrophobic two-dimensional pore channels. The preparation method comprises the following steps: stirring and dispersing single-layer graphene oxide powder in an aqueous solution, adding an organosilane monomer, polymerizing at a certain temperature to obtain a GO-silane membrane casting solution, dripping the GO-silane membrane casting solution on a substrate membrane, and naturally depositing to form the membrane, wherein the substrate is a membrane with one-dimensional pore channels. An oligomer is modified on a graphene oxide nanosheet, then a hydrophobic and sliding two-dimensional pore channel is formed through graphene oxide pi-pi stacking, a GO / polysilane film is prepared on a substrate film through simple high-temperature polymerization and natural deposition, a 1D / 2D composite nanopore channel is constructed, and the graphene oxide / polysilane composite nanopore channel is prepared. And the material has asymmetric pore size and hydrophilic-hydrophobic property, and has different transmission characteristics for electrolytes with different hydrophilic-hydrophobic properties and concentrations.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a graphene oxide composite film with hydrophobic two-dimensional channels and a preparation method thereof. Background technique [0002] Inspired by biological channels, people's attention to nanopores has gradually increased, and nanopores with high selectivity and high throughput have become ideal materials for ion screening and gating. At present, nanopores are roughly divided into three types: one-dimensional nanopores, two-dimensional nanopores and composite nanopores. Among them, two-dimensional materials form dense Angstrom-level pores by stacking nanosheets through π-π. Because of the characteristics of the channels themselves, Compared with one-dimensional channels, it has higher flux and higher selectivity, and is widely used. Among many two-dimensional materials, graphene oxide has become a commonly used material for constructing two-dimensional channels ...

AI Technical Summary

Problems solved by technology

However, graphene oxide is usually prepared by suction filtration, which takes a long time to prepare, consumes a lot of energy, and is easy to disperse in water, which greatly limits its application.

Moreover, the graphene oxide channels prepared by most current methods are hydrophilic, which hinders the transport of hydrophobic ions. There is still a technical gap in how to prepare hydrophobic graphene oxide channels.

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