Quaternary phosphonium salt antibacterial ultrafiltration membrane and preparation method thereof

Abstract

The invention provides a quaternary phosphonium salt antibacterial ultrafiltration membrane. The membrane sequentially comprises a porous mechanical support membrane, an ultrafiltration separation functional layer and a polymer layer from bottom to top. The preparation method of the ultrafiltration membrane comprises the following steps: S1, forming the porous support membrane; S2, preparing the polymer layer; and S3, carrying out drying and post-processing. Quaternary phosphonium salt is one of the latest research results in the field of antibacterial agent research, and experiments prove that the antibacterial effect of the quaternary phosphonium salt is nearly two orders of magnitude greater than the antibacterial effect of quaternary ammonium salt, so the antibacterial performance of the ultrafiltration membrane can be greatly improved; secondly, a separation contact layer of the ultrafiltration membrane is formed by coating a traditional hydrophobic material with a hydrophilic quaternary phosphonium salt antibacterial polymer, so hydrophilicity is improved, and the ultrafiltration membrane is thus good in anti-pollution performance and relatively high in water production flux; and in addition, positive charge P<+> ions of the quaternary phosphonium salt polymer layer can endow the ultrafiltration membrane with interception performance on ions, especially on positively charged ion substances.

Description

technical field [0001] The invention relates to the technical field of sewage treatment membranes, in particular to a quaternary phosphonium salt antibacterial ultrafiltration membrane and a preparation method thereof. Background technique [0002] In the field of filter membrane technology for sewage treatment, membrane water treatment is a solid-liquid separation technology. It uses membrane pores to filter water and retain impurities in water. Using such a membrane can mainly remove colloids and plankton, etc. Insoluble iron and manganese are removed, and fungi can be removed. However, in order to prevent bacteria from being regenerated in the clear water pool, the sterilization process cannot be omitted. The raw water directly connected to the plate-frame and spiral membranes should remove the floating substances in the raw water before flowing into the membrane in order to prevent the membrane pores from being blocked. [0003] Different from the filtration membrane s...

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Problems solved by technology

[0003] Different from the filtration membrane separation technology, the membrane separation technology only provides the necessary operating pressure for the supply of raw water, and only needs to run for a long time before flushing the filter membrane, and there are no other processes. In this case, it is easy to manipulate the membrane device to make it Automation, unmanned management, but it is not easy to automate routine processing

The ultrafiltration membrane developed now uses organic polymer materials, such as quaternary ammonium salt antibacterial agents, which have been widely used and can greatly improve the filtration efficiency, but a large number of microorganisms are easy to adsorb on the surface of the membrane. , growth, and reproduction cause bacterial pollution, and bacteria and fungi have gradually produced a certain degree of drug resistance, and the residue after use has certain toxicity, which causes membrane fouling and reduces the performance of the membrane.

Therefore, the present invention provides a quaternary phosphonium salt antibacterial ultrafiltration membrane and a preparation method thereof to solve the problems of poor antibacterial effect of water treatment membranes, easy fouling and low water production flux, improve the antibacterial effect of water treatment membranes, and enhance ultrafiltration. Membrane service life

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