Preparation method of hollow fiber composite loose nanofiltration membrane

Abstract

The invention provides a preparation method of a hollow fiber composite loose nanofiltration membrane. The method comprises the following steps: blending and dissolving polyether sulfone, dimethylacetamide and polyethylene glycol, so as to form spinning casting membrane solution, spinning through certain technological conditions, so as to obtain hollow fiber external pressed film, and soaking through sulfuric acid aqueous solution, so as to obtain a hollow fiber composite loose nanofiltration membrane with the a separation aperture reaching a nanoscale. The loose nanofiltration membrane has the advantages of simple preparation method, large volume fraction, small floor space, high treatment efficiency and small separation aperture, has good removal effect on particulate matter colloid, has good removal effect on low molecular weight organic matter in water, and can intercept molecules with molecular weight below 1000Da. The loose nanofiltration membrane can be effectively applied to the pretreatment of organic matter in concentrated water, for example the loose nanofiltration membrane can be applied to the separation of antibiotics and dye, with the molecular weight being about 1000g / mol, in water and an organic solvent. The loose nanofiltration membrane further has good removal effect on inorganic matter.

Description

technical field [0001] The invention relates to the technical field of polymer material membranes, in particular to a method for preparing hollow fiber composite loose nanofiltration membranes. Background technique [0002] With the development of economy and technology, separation technology occupies a pivotal position in modern industry, especially in the field of chemical industry. In recent years, membrane separation technology has gradually replaced traditional separation technologies such as extraction and rectification due to its advantages of low energy consumption, low emission, high degree of automation, and small footprint. It is one of the emerging separation technologies and is a solution to sewage treatment, An important means of water problems such as seawater desalination and reclaimed water reuse. At present, the membrane separation industry can not only carry out gradient separation for different molecular weight substances, but also realize the recovery o...

AI Technical Summary

Problems solved by technology

Due to biodegradation, the organic matter in the concentrated water will make the receiving water body anoxic or even anaerobic, and most aquatic organisms will die, resulting in foul smell, deteriorating water quality and environment

② Sensory pollution

Concentrated organic matter not only makes the water body lose its use value, but also seriously affects the normal life of people near the water body

③ Toxic hazard

Organic matter in concentrated water has a high degree of pollution to the environmental water body, and the treatment is difficult, which is one of the problems in the field of environmental protection research at home and abroad.

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