title: Preparation and characterization of polysaccharides/PVA blend nanofibrous membranes by electrospinning method.
abstract: A series of polyvinyl alcohol (PVA), PVA/chitosan (CS) and PVA/cyanobacterial extracellular polymeric substances (EPS) blended nanofibrous membranes were produced by electrospinning using a microfiltration poly(vinylidene fluoride) (PVDF) basal membrane, for potential applications in water filtration. Nanofibres were obtained from solutions of 20% (w/w) PVA with 1% (w/w) CS or EPS, using a weight ratio of 60/40. Blended nanofibres have shown a smooth morphology, no beads formation and diameters between 50 and 130 nm. Thermo-mechanical analysis demonstrated that there were inter and/or intramolecular hydrogen bonds between the molecules of PVA/CS and PVA/EPS in the blends. The electrospun blended PVA/EPS membrane showed better tensile mechanical properties when compared with PVA and PVA/CS, and resisted more against disintegration in the temperature range between 10 and 50 °C. Finally, the blended membranes have shown an increase in chromium binding capacity of 5%. This is the first successful report of a blended membrane of electrospinned cyanobacterial polysaccharide with PVA.
authors.affiliation: Centro de Nanotecnologia e Materiais Técnicos, Funcionais e Inteligentes (CeNTI), 4760-034 Vila Nova de Famalicão, Portugal. Electronic address: carla.correiasantos@gmail.com.
authors.forename: Carla
authors.initials: C
authors.lastname: Santos
authors.forename: Carla J
authors.initials: CJ
authors.lastname: Silva
authors.forename: Zsófia
authors.initials: Z
authors.lastname: Büttel
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Guimarães
authors.forename: Sara B
authors.initials: SB
authors.lastname: Pereira
authors.forename: Paula
authors.initials: P
authors.lastname: Tamagnini
authors.forename: Andrea
authors.initials: A
authors.lastname: Zille
mesh_terms: D002857:Chromium / Q000302:isolation & purification; D000458:Cyanobacteria / Q000737:chemistry*; D055664:Electrochemical Techniques; D005374:Filtration / Q000295:instrumentation* / Q000379:methods; D006860:Hydrogen Bonding; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning; D057139:Nanofibers / Q000737:chemistry / Q000648:ultrastructure; D011135:Polysaccharides, Bacterial / Q000737:chemistry* / Q000302:isolation & purification; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D013696:Temperature; D013718:Tensile Strength; D013818:Thermogravimetry; D014873:Water Pollutants / Q000302:isolation & purification; D018508:Water Purification; D005465:Fluorocarbon Polymers
chemical_list: D002857:Chromium; D008567:Membranes, Artificial; D011135:Polysaccharides, Bacterial; D011142:Polyvinyl Alcohol; D011145:Polyvinyls; D014873:Water Pollutants; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers
keywords: Chitosan (CS); Cyanobacteria; Electrospinning; Extracellular polymeric substances (EPS); Filtration; Membrane; Polyvinyl alcohol (PVA)