Preparation method of high-flux and anti-pollution reverse osmosis membrane and application of membrane

Abstract

The invention provides a preparation method of a high-flux and anti-pollution reverse osmosis membrane. The preparation method of the high-flux and anti-pollution reverse osmosis membrane comprises the following steps: soaking a support layer in an aqueous solution with multifunctional aromatic amine compounds, taking the support layer out, drying the support layer, then soaking the support layer in a multifunctional acyl chloride oil phase solution, volatilizing and drying the support layer, then soaking the support layer in a modifier for 10-600 seconds, taking the support layer out and poaching the support layer in pure water to obtain the high-flux and anti-pollution reverse osmosis membrane, wherein the modifier is selected from any one of monoethanolamine, diethanol amine, triethanolamine, dimethylaminoethanol, diethylaminoethanol, 2-amino-propanol, dimethyl amine isopropyl alcohol, 3-amino-isopropyl alcohol and the like. According to the high-flux and anti-pollution reverse osmosis membrane prepared by the method, the hydrophilcity of the membrane can be improved; the salt removing rate remains at the level before modification; the charge performance of the membrane surface is reduced; the effect of shielding pollution of the charge substances in the running water is reduced; the high-flux and anti-pollution reverse osmosis membrane is suitable for industrial production and capable of meeting the requirements for long-term operation under the ultra-low voltage condition.

Description

【Technical field】 [0001] The invention relates to a reverse osmosis membrane, in particular to a preparation method of a modified reverse osmosis membrane and an application of the reverse osmosis membrane obtained by the method. 【Background technique】 [0002] Reverse osmosis membranes are widely used in the field of water treatment, and most of the current commercial membranes are polyamide composite membranes. For example, the commonly used polyamide reverse osmosis membrane, its technical principle is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water, and has the advantages of good water quality, low energy consumption, no pollution, simple process, and easy o...

AI Technical Summary

Problems solved by technology

However, these methods do not significantly improve the performance of the membrane. At the same time, due to the side reactions of other small molecules introduced in the reaction, a looser desalination layer is formed, so more negatively charged groups are brought into the membrane surface, which will lead to The anti-pollution performance of the

Images