Photocatalytic MXene composite membrane and preparation method thereof

Abstract

The invention discloses a photocatalytic MXene composite membrane and a preparation method thereof. Bi2O2CO3 nanoparticles are modified by using CTAB (Cetyltrimethyl Ammonium Bromide) through a low-temperature chemical modification method, and N-Bi2O2CO3 is prepared; 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 preparation method comprises the following steps: carrying out ultrasonic mixing on an MXene dispersion solution and an N-Bi2O2CO3 dispersion solution, and constructing the N-Bi2O2CO3-coated MXene composite membrane on a PES (Polyether Sulfonate) membrane base material in a vacuum suction filtration manner. The composite membrane has good anti-pollution and self-cleaning capacity, the problems that a traditional membrane is short in service life and the mechanical performance of MXene serving as a membrane material is poor are effectively solved, due to the addition of the photocatalyst, a separation channel of the MXene membrane is expanded, the permeability of the composite membrane is obviously improved, the composite membrane is endowed with the self-cleaning capacity, and the composite membrane has good anti-pollution and self-cleaning functions. The synergistic removal of various pollutants in a complex water body by the membrane is realized, and a good practical application prospect is shown.

Description

technical field [0001] The invention belongs to the technical field of membrane materials and membrane preparation, and relates to a preparation method of a photocatalytic MXene composite membrane and a photocatalytic MXene composite membrane prepared by the preparation method. Background technique [0002] Industrial wastewater refers to the wastewater and waste liquid produced in the process of industrial production. Its pollutants are various and complex (common such as oil, dyes, heavy metals and microorganisms, etc.). If they are not treated effectively before discharge, the surrounding ecological environment will and human health constitute a huge threat. Membrane separation technology has the characteristics of high separation efficiency and environmental friendliness, and has been widely used in industrial wastewater treatment and other fields. Membrane material is the key to membrane separation technology and the core component of membrane technology industrializat...

AI Technical Summary

Problems solved by technology

However, this method has the following defects: ①Using HF solvent etching treatment, the MXene material with a clear lamellar structure can be effectively peeled off from the MAX phase

This technology shows that the most suitable MXene content is 0.2g, which obviously leads to too thick MXene separation layer, and the membrane separation layer is prone to swelling, falling off and collapse, which has no actual water treatment value, and cannot determine the separation of pollutant molecules in water by MXene mechanism

③The functional groups on the surface of MXene itself are relatively simple, and the performance of the pure MXene / PES composite membrane needs to be further improved. The rejection rate of the composite membrane for salt ions is very low, only about 10%, so it is necessary to micro-control the MXene

And this technology also has some insurmountable defects: ①This technology only has photocatalytic ability, not that the present invention is based on the coupling of photocatalytic technology and membrane separation technology

The photocatalyst N-BOC powder is easy to agglomerate in the degraded dye, and the photodegradation process will lead to a decrease in the specific surface area and weaken the catalytic effect

② The photocatalytic material itself is not easy to separate and recycle, and it is easy to cause secondary pollution to the degraded products, and it is impossible to realize the secondary utilization of photocatalyst, and the ideal effect cannot be achieved in the actual application process

③Powder photocatalysts are mainly used to treat single pollutants, and the treatment of multiple pollutants in complex water environments remains to be studied

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