Two-dimensional MXene-based oil-water separation membrane and preparation method thereof

Abstract

The invention discloses a two-dimensional MXene-based oil-water separation membrane and a preparation method thereof, and belongs to the field of materials. The preparation method comprises the following steps: preparing T-ZIF-8 nanoparticles by a modification method of constructing a surface metal-phenolic aldehyde coating on the surface of ZIF-8 through TA; the method comprises the following steps: stripping MAX by using a LiF and HCl mixed solution to obtain a two-dimensional MXene material with a clear lamellar structure; the method comprises the following steps: ultrasonically mixing an MXene dispersion solution and a T-ZIF-8 dispersion solution, and constructing the T-ZIF-8-MXene composite membrane by using a CA membrane as a support layer in a vacuum filtration manner, and using the T-ZIF-8-MXene composite membrane for oil-water separation in industrial wastewater. According to the invention, the two materials T-ZIF-8 and MXene are creatively combined to construct the oil-water separation composite membrane with high permeation flux and strong pollution resistance, and the barrier that the MXene membrane can only be used for separating soluble small molecules is broken. The membrane is highly stable under complex chemical conditions, and has high treatment efficiency and recyclability, so that the purposes of reducing the industrial wastewater treatment cost and improving the treatment efficiency are achieved.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a preparation method of a two-dimensional MXene-based oil-water separation membrane and a two-dimensional MXene-based oil-water separation membrane prepared by the preparation method. Background technique [0002] Oily wastewater pollution discharged from industry and daily activities is endangering the ecological environment and human health. In most cases, the composition of oily wastewater is very complex, because they contain not only insoluble oils, but also various soluble organic pollutants and heavy metal ions. Therefore, the comprehensive treatment of oily wastewater containing multiple pollutants is one of the hot spots in the field of wastewater treatment. So far, membrane technology has attracted great attention in the field of oily wastewater treatment due to its advantages of simple operation, high efficiency, and low energy consumption. However, most commerci...

AI Technical Summary

Problems solved by technology

But this technology has the following problems: 1. Using HF solvent etching treatment, due to the strong corrosiveness of HF acid solution, a large amount of use will pose a huge threat to human health and the surrounding environment

And the HF etching method, the etching principle is not yet clear, the stripped layer is often a single-layer structure, the accumulation is often not tight enough, it is easy to fall off, and the pore diameter is blocked

2. The flux of the composite membrane is too low, and the performance of the pure MXene / PVDF composite membrane needs to be further improved. For example, the flux of the composite membrane in the article is only 437-540L m -2 h -1 , it is far from enough to treat waste oily wastewater

3. Poor anti-pollution performance

However, this technology only endows the hydrophilicity of nano-ions, but because of its cubic crystal structure, it cannot form a film by itself.

Secondly, the powder is easy to agglomerate in water, and it is prone to poor film-forming effect when the film is formed by suction filtration at the end.

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