TY - JOUR
T1 - Fabrication and structural tailoring of reverse osmosis membranes using β-cyclodextrin-cored star polymers
AU - Jeon, Sungkwon
AU - Park, Chan Hyung
AU - Shin, Seung Su
AU - Lee, Jung Hyun
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government ( 2019R1A2C1002333 , 2019M3E6A1064103 and 2018R1A4A1022194 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Here, we designed a new chemistry of fouling-resistant reverse osmosis (RO) membranes using a star polymer (CD-PAH) comprising multiple linear polymer (poly(acryloyl hydrazide), PAH) arms grafted onto a β-cyclodextrin (β-CD) core. The well-defined structure of the β-CD-cored star polymer enabled us to systematically synthesize CD-PAHs with different arm lengths, which were assembled into membrane selective layers via a layered interfacial polymerization technique. Increasing the PAH arm length of CD-PAH enhanced the inter-chain entanglement of PAH arms and thus the crosslinking reaction efficiency by providing a higher density of the crosslinkable amine groups of densely-packed PAH arms. Hence, longer PAH arms of CD-PAH resulted in an enhancement in NaCl rejection with a reduction in the water permeance of the CD-PAH-assembled (CD-TFC) membrane. Importantly, the CD-TFC membranes prepared using CD-PAHs with longer PAH arms exhibited RO separation performance comparable to that of a commercial RO membrane, which is not feasible by other reported branch-structured macromolecules. Furthermore, the CD-TFC membrane displayed lower organic fouling with a higher rinsing efficiency than a commercial RO membrane, because of its more negatively charged and hydrophilic surface combined with its smoother surface, overcoming a performance-fouling trade-off.
AB - Here, we designed a new chemistry of fouling-resistant reverse osmosis (RO) membranes using a star polymer (CD-PAH) comprising multiple linear polymer (poly(acryloyl hydrazide), PAH) arms grafted onto a β-cyclodextrin (β-CD) core. The well-defined structure of the β-CD-cored star polymer enabled us to systematically synthesize CD-PAHs with different arm lengths, which were assembled into membrane selective layers via a layered interfacial polymerization technique. Increasing the PAH arm length of CD-PAH enhanced the inter-chain entanglement of PAH arms and thus the crosslinking reaction efficiency by providing a higher density of the crosslinkable amine groups of densely-packed PAH arms. Hence, longer PAH arms of CD-PAH resulted in an enhancement in NaCl rejection with a reduction in the water permeance of the CD-PAH-assembled (CD-TFC) membrane. Importantly, the CD-TFC membranes prepared using CD-PAHs with longer PAH arms exhibited RO separation performance comparable to that of a commercial RO membrane, which is not feasible by other reported branch-structured macromolecules. Furthermore, the CD-TFC membrane displayed lower organic fouling with a higher rinsing efficiency than a commercial RO membrane, because of its more negatively charged and hydrophilic surface combined with its smoother surface, overcoming a performance-fouling trade-off.
KW - Antifouling
KW - Reverse osmosis
KW - Star polymer
KW - Thin film composite membranes
KW - β-cyclodextrin
UR - http://www.scopus.com/inward/record.url?scp=85087213372&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2020.118415
DO - 10.1016/j.memsci.2020.118415
M3 - Article
AN - SCOPUS:85087213372
SN - 0376-7388
VL - 611
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
M1 - 118415
ER -