Preparation method of nano inorganic-organic nano-filtration membrane

Abstract

The invention relates to a preparation method of a nano inorganic-organic nano-filtration membrane, and belongs to the technical field of nano-filtration membrane preparation. The preparation method comprises the following steps: putting cellulose acetate into dichloromethane, stirring to obtain a casting solution; painting the casting solution on a glass plate to form a wet membrane with a thickness of 280 [mu]m, allowing the wet membrane to stand still for 20-23 minutes, then soaking the glass plate in deionized water with a temperature of 20-23 DEG C for 10 to 15 minutes so as to obtain an asymmetric membrane; subjecting the asymmetric membrane to exchange treatments in a methanol solution and cyclohexane in sequence so as to obtain a cellulose acetate nano-filtration flat wet membrane; soaking the obtained wet membrane in a silver nitrate solution for 20 to 30 minutes, washing so as to obtain a composite wet membrane; paving the composite wet membrane on an insulation surface, radiating the upper surface of the composite wet membrane by argon ion laser beams for 15 to 25 minutes so as to obtain the target product. The permeation flux of the membrane prepared by the provided preparation method will increase when the temperature is rising.

Description

technical field

[0001] The invention relates to a method for preparing a nano-inorganic-organic composite nanofiltration membrane, belonging to the technical field of nanofiltration membrane preparation. Background technique

[0002] Membrane separation technology is an emerging discipline produced by the cross-combination and interpenetration of many disciplines such as materials, chemical engineering and process engineering. It is an important high-tech solution to contemporary energy, resource and environmental problems. The application of nano-inorganic-organic composite membranes in membrane separation technology is particularly prominent. Because nanoparticles have the characteristics of large specific surface area, highly activated surface active atoms, and strong interfacial interaction with polymers, using inorganic nanoparticles as a reinforcing phase to uniformly disperse them in the organic host phase can improve the interaction with the matrix. The interface is...