Charge- and Size-Selective Molecular Separation using Ultrathin Cellulose Membranes
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
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AbstractTo date, it is still a challenge to prepare high-flux and highselectivity microporous membranes thinner than 20 nm without introducing defects. In this work, we report for the first time the application of cellulose membranes for selective separation of small molecules. A freestanding cellulose membrane as thin as 10 nm has been prepared through regeneration of trimethylsilyl cellulose (TMSC). The freestanding membrane can be transferred to any desired substrate and shows a normalized flux as high as 700 L m−2 h−1 bar−1 when supported by a porous alumina disc. According to filtration experiments, the membrane exhibits precise size-sieving performances with an estimated pore size between 1.5–3.5 nm depending on the regeneration period and initial TMSC concentration. A perfect discrimination of anionic molecules over neutral species is demonstrated. Moreover, the membrane demonstrates high reproducibility, high scale-up potential, and excellent stability over two months.
CitationPuspasari T, Yu H, Peinemann K-V (2016) Charge- and Size-Selective Molecular Separation using Ultrathin Cellulose Membranes. ChemSusChem 9: 2908–2911. Available: http://dx.doi.org/10.1002/cssc.201600791.
SponsorsWe gratefully acknowledge financial support from the King Abdullah University of Science and Technology (KAUST). We also thank Dr.Ali Behzad and Mohamed Nejib Hedhili from KAUST Analytical Core Lab for help with the SEM and XPS analysis.
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