Method for preparing catechol-based hydrophilic modified organic tubular membrane

Abstract

The invention discloses a method for preparing a catechol-based hydrophilic modified organic tubular membrane, which comprises the following steps: soaking a membrane tube in pure water to obtain a completely infiltrated membrane tube; adding a catechol group-containing hydrophilic modifier and a silane coupling agent into a pH buffer solution to prepare a solution; and completely immersing the infiltrated membrane tube in the hydrophilic modifier solution, carrying out aeration treatment at the bottom of a hydrophilic modifier solution container to enable the hydrophilic modifier to be subjected to a full oxidation reaction, then conducting immersing in pure water to remove residues on the surface of the membrane tube, and conducting packaging to obtain a tubular membrane product. According to the method for hydrophilically modifying the organic tubular membrane through the catechol groups, the catechol group-containing hydrophilic modifier such as dopamine and tannic acid and the silane coupling agent are subjected to composite deposition on the surface of the membrane, so that the hydrophilicity of the membrane is improved, and the organic tubular membrane which is large in membrane flux, good in hydrophilicity and easy to clean is prepared. The method is simple to operate and easy for industrial production, improves the oil-water separation performance of partial material membranes, and expands the application range.

Description

technical field [0001] The invention relates to the field of hydrophilic modification methods for separation membranes, in particular to a method for hydrophilically modifying organic tubular membranes with catechol groups. Background technique [0002] Membrane separation technology is a new type of separation technology that has risen rapidly in recent years. It is a technology that combines materials science, process and technology, and chemical engineering principles. Due to the multidisciplinary nature of the technology, it can be used in different types of separation processes. The separation principle of membrane technology is to select a specific membrane (microfiltration, ultrafiltration, nanofiltration or reverse osmosis membrane, etc.) purpose of separation. Today, when the global water resources are becoming more and more scarce and the environment is deteriorating, membrane science and technology have received unprecedented attention worldwide. Due to the con...

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Problems solved by technology

[0004] Recently, microfiltration or large-pore ultrafiltration membranes are mainly used in wastewater treatment. However, since most of the membrane materials on the market are hydrophobic materials such as PDVF and PES, the membrane flux is often attenuated due to insufficient hydrophilicity. And it is difficult to clean, and hydrophilic modification is required, and it is required that the hydrophilic substance does not lose or rarely loses so that the separation membrane can maintain good hydrophilicity for a long time