Poly (maleic anhydride-alt-1-alkenes) directly grafted to γ-alumina for high-performance organic solvent nanofiltration membranes

• Published in: Journal of membrane science 2018-10, Vol.564, p.259-266
• Main Authors: Amirilargani, Mohammad, Merlet, Renaud B., Nijmeijer, Arian, Winnubst, Louis, de Smet, Louis C.P.M., Sudhölter, Ernst J.R.
• Format: Article
• Language: English
• Subjects: Alternating copolymer; Alumina membrane; Grafting; Organic solvent nanofiltration
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2018.07.042

In this study we describe a novel and simple method to couple covalently poly (maleic anhydride-alt-1-alkenes) to γ-alumina nanofiltration membranes for the first time. The 1-alkenes varied from 1-hexene, 1-decene, 1-hexadecane to 1-octadecene. The grafting reaction was between the reactive anhydride moieties of the polymer and surface hydroxyl groups, resulting in highly stable bonds. The modified membranes were investigated for their permeation and rejection performance of Sudan Black (SB, Mw 457 Da) in either toluene or ethyl acetate (EA) solution, and very high rejections (> 90%) and high permeation flux were observed compared to unmodified membranes. Initially, the SB in toluene solution was found to bind strongly to the surface hydroxyl groups of the unmodified membranes, an effect not observed in EA solution. [Display omitted] •Novel and facile technique for grafting of γ-alumina has been explored.•Grafted membranes exhibited excellent performance in either toluene or ethyl acetate.•Solute affinity to the membrane influences membrane separation performance.