Electrokinetic and surface chemical characterizations of an irradiated microfiltration polysulfone membrane: Comparison of two irradiation doses

• Published in: Journal of colloid and interface science Vol. 310; no. 2; pp. 519 - 528
• Main Authors: de Lara, R., Benavente, J.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 15.06.2007; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; Diffusional permeability; Dose-Response Relationship, Radiation; Electrochemistry; Exact sciences and technology; Filtration; Gamma Rays; General and physical chemistry; Impedance spectroscopy; Ion Transport - radiation effects; Ionizing radiation treatment; Irradiation dose; Kinetics; Membranes; Membranes, Artificial; Microscopy, Electron, Scanning; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Polymers; Porosity - radiation effects; Radiation chemistry; Sodium Chloride - chemistry; Sulfones; XPS; Zeta potential; Irradiation dose; XPS; Diffusional permeability; Impedance spectroscopy; Zeta potential; Ionizing radiation treatment; Electrokinetics; X ray; Permeability; Characterization; Microfiltration; Ionizing radiation; Membrane; Electrokinetic potential; Photoelectron spectrometry; Impedance
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2007.01.079

The effect of ionizing radiation on the surface and electrokinetic characteristic parameters for a porous membrane of pore size 0.2 μm is determined and correlated with the irradiation dose (10 and 80 J/kg). Changes in NaCl permeability and membrane system electrical resistance determined from diffusion and impedance spectroscopy measurements are consistent with the increase of membrane pore radii/porosity, in agreement with SEM micrographs and reported results. Low irradiation dose seems to clean the membrane surface of impurities, according to XPS results, but the increase of irradiation doses could affect surface roughness. Due to the relatively high pore radius, ion transport numbers are practically independent of radiation and dose, but irradiation slightly modifies the membrane solution interface by increasing its weakly electronegative character, which could be of interest in the ultrafiltration of proteins or macromolecules. Effect of gamma irradiation on (a) membrane diffusional permeability; (b) zeta potential. (○) Original sample; (▵) 10 J/kg dose; (◊) 80 J/kg dose.