Preparation method of inorganic nano-hybrided and positively-charged polyelectrolyte complex pervaporation membrane

Abstract

The invention discloses a preparation method of an inorganic nano-hybrided and positively-charged polyelectrolyte complex pervaporation membrane. An inorganic nanoparticle hybrided anionic polyelectrolyte aqueous solution is prepared; a cationic polyelectrolyte aqueous solution with pH (potential of hydrogen) being 5.8-10.0 is prepared; the inorganic nanoparticle hybrided anionic polyelectrolyte aqueous solution is dropwise added to the cationic polyelectrolyte aqueous solution, and an inorganic nano-hybrided and positively-charged polyelectrolyte complex is obtained; the complex is dispersed in a monobasic acid aqueous solution, filtered and left to stand for defoaming, a polysulfone ultrafiltration membrane is coated with the complex through a film wiping knife, and the inorganic nano-hybrided and positively-charged polyelectrolyte complex pervaporation membrane is obtained after drying. The inorganic nano-hybrided and positively-charged polyelectrolyte complex with different composition can be obtained by doping inorganic nanoparticles at different mass percentages and adjusting the pH value of the cationic polyelectrolyte solution. The prepared inorganic nano-hybrided and positively-charged polyelectrolyte complex pervaporation membrane has excellent separation performance and high stability.

Description

technical field

[0001] The invention belongs to the fields of polymer material preparation and membrane separation, and in particular relates to a method for preparing an inorganic nanometer hybrid positively charged polyelectrolyte complex pervaporation membrane. Background technique

[0002] As a membrane separation technology, pervaporation uses membranes to dissolve and diffuse different components in the feed liquid to achieve the separation of different components. It has the characteristics of high efficiency, energy saving, simple operation, and easy scale-up. This technology can effectively separate near-boiling and azeotropic mixed solutions, and can also be used to remove trace moisture in organic matter. It has broad application prospects and markets in petrochemical, pharmaceutical, food and environmental protection and other fields. Pervaporation can also be integrated with separation technologies such as distillation to better utilize the advantages of high ef...