Nanofiltration applications of tough MWNT buckypaper membranes containing biopolymers

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dc.contributor.authorRashid, MHOen_AU
dc.contributor.authorTriani, Gen_AU
dc.contributor.authorScales, Nen_AU
dc.contributor.authorin het Panhuis, Men_AU
dc.contributor.authorNghiem, Den_AU
dc.contributor.authorRalph, SFen_AU
dc.date.accessioned2018-09-14T01:01:02Zen_AU
dc.date.available2018-09-14T01:01:02Zen_AU
dc.date.issued2017-05-01en_AU
dc.date.statistics2018-09-10en_AU
dc.description.abstractThe ability of biopolymers (bovine serum albumin, lysozyme, chitosan, gellan gum and DNA) to facilitate formation of aqueous dispersions of MWNTs was investigated using a combination of absorption spectrophotometry and optical microscopy. Subsequently, self-supporting carbon nanotube membranes, known as buckypapers (BPs), were prepared by vacuum filtration of the dispersions. Microanalytical data obtained from the BPs confirmed the retention of biopolymers within their structures. Tensile test measurements performed on the BPs showed that incorporation of the biopolymers resulted in significant improvements in mechanical properties, compared to analogous BPs containing MWNTs and the low molecular mass dispersant Triton X-100. For example, MWNT/CHT BPs (CHT=chitosan) exhibited values for tensile strength, ductility, Young's modulus and toughness of 28±2MPa, 5.3±2.7%, 0.9±0.3GPa and 1.7±0.3J g−1, respectively. Each of these values are significantly greater than those obtained for MWNT/Trix BPs, prepared using a low molecular weight dispersant (6±3MPa, 1.3±0.2%, 0.6±0.3GPa and 0.10±0.06J g−1, respectively). This significant improvement in mechanical properties is attributed to the ability of the long biopolymer molecules to act as flexible bridges between the short CNTs. All BPs possessed hydrophilic surfaces, with contact angles ranging from 29±2° to 57±5°. Nitrogen gas porosimetry showed that the BPs have highly porous internal structures, while scanning electron microscopy (SEM) showed their surface morphologies have numerous pore openings. The permeability of the BPs towards water, inorganic salts, and dissolved trace organic contaminants (TrOCs), such as pharmaceuticals, personal care products, and pesticides, was investigated through filtration experiments. Of the twelve TrOCs investigated in this study, nine were rejected by more than 95% by BPs composed of MWNTs and chitosan. The latter BPs also demonstrated good rejection of both NaCl (30–55%) and MgSO4 (40–70%). © 2017 Elsevier B.V.en_AU
dc.identifier.citationRashid, M. H.-O., Triani, G., Scales, N., in het Panhuis, M., Nghiem, L. D., & Ralph, S. F. (2017). Nanofiltration applications of tough MWNT buckypaper membranes containing biopolymers. Journal of Membrane Science, 529, 23-34. doi:10.1016/j.memsci.2017.01.040en_AU
dc.identifier.govdoc9141en_AU
dc.identifier.issn0376-7388en_AU
dc.identifier.journaltitleJournal of Membrane Scienceen_AU
dc.identifier.pagination23-34en_AU
dc.identifier.urihttps://doi.org/10.1016/j.memsci.2017.01.040en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8980en_AU
dc.identifier.volume529en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectFiltrationen_AU
dc.subjectPolymersen_AU
dc.subjectCarbon nanotubesen_AU
dc.subjectComposite materialsen_AU
dc.subjectOrganic compoundsen_AU
dc.subjectWateren_AU
dc.subjectPurificationen_AU
dc.titleNanofiltration applications of tough MWNT buckypaper membranes containing biopolymersen_AU
dc.typeJournal Articleen_AU
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