A graphene composite photocatalytic ultrafiltration membrane and preparation method thereof

Abstract

In the present invention, the membrane is first prepared by blending graphene oxide and polysulfone, and the hydrophilicity and anti-pollution ability of the ultrafiltration membrane are improved by using graphene oxide, and then the dispersion liquid of aminated titanium dioxide and water is used as a coagulation liquid for semi-curing The ultrafiltration membrane is solidified by suction filtration, and the amino groups of aminated titanium dioxide are cross-linked with the carboxyl groups of carboxylated graphene oxide during the curing process, so that the combination of titanium dioxide nanoparticles and the membrane is improved through physical and chemical dual effects, and the traditional optical solution is solved. The loss of photocatalytic particles in the catalytic ultrafiltration membrane.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a graphene composite photocatalytic polysulfone ultrafiltration membrane capable of photocatalytic degradation. Background technique [0002] With the significant improvement of people's living standards, water pollution has become a major environmental problem, which has attracted more and more countries' attention. At present, traditional treatment methods such as physical adsorption, chemical oxidation, and microbial treatment can only alleviate water pollution to a certain extent, but it is difficult to have a good treatment for organic substances that are very difficult to degrade and treat in polluted wastewater. effect. Photocatalytic technology is one of the fastest-growing technologies in recent years. Photocatalysts such as titanium dioxide can efficiently decompose certain organic and inorganic substances under the irradiation of a specific light source, thereby greatly ...

AI Technical Summary

Problems solved by technology

[0003] For the existing photocatalytic ultrafiltration membrane, it is generally to coat the photocatalyst on the surface of the membrane or blend the photocatalyst and the casting solution to form the membrane. During the process, the catalyst on the surface of the membrane is easily washed away by wastewater, resulting in poor membrane stability, and the latter solves the problem of catalyst loss by blending the cast membrane, but the general photocatalyst is inorganic particles, inorganic particles and organic ultrafiltration membranes. The compatibility is poor, and most of the blended inorganic particles are fixed in the membrane, and will not contact the wastewater during the application of the membrane, thus losing its original intention of photocatalysis

In addition, some researchers placed commercial ultrafiltration membranes in titanium dioxide precursors to achieve in-situ synthesis of titanium dioxide at the membrane pores. There is still the problem of catalyst loss in