Abstract
UDC 66.086.2
DOI https://doi.org/10.52577/eom.2022.58.3.62
To stabilize the dynamic layer of cellulose acetate (CA) and polystyrene (PS) membranes, the membrane was exposed to UV radiation using a laboratory setup in atmospheric air. As a base for dynamic membranes, a micro-filtration membrane made of nylon-66 and a membrane made of polytetrafluoroethylene (PTFE) grade MFFC-3G were used. Dynamic membranes PTFE-CA, PTFE-PSd nylon-CA, nylon-PS were obtained by forming a semi-permeable layer on the surface of a porous base from suspended microparticles of PS or CA present in a filtered aqueous solution of acetone with sizes of 81–504 nm and 42–130 nm, respectively, in a dynamic equilibrium with the solution. After obtaining the membranes, the surface was treated for 10 minutes with UV radiation in the wavelength range of 280–320 nm, with a UV radiation power of 36 W. Stabilization of dynamic membranes by UV radiation made it possible to increase the specific productivity of CA membranes 10 times and of PS by 1.5 times, while reducing the retention capacity of those membranes in terms of oil products by 9–17%. UV treatment of polymeric membranes can be used to increase the specific productivity and stabilization of dynamic membranes with a PS surface layer.
Keywords: composite membranes, dynamic layer, nylon, cellulose acetate, polytetrafluoroethylene, polystyrene, UV radiation, contact angle, FTIR spectroscopy.