Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 36, Pages 43193-43204Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c09390
Keywords
interfacial polymerization; highly active thiolated beta-cyclodextrin; poly(thioester) linkage; loose nanofiltration; chlorine resistance
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In this study, a highly active thiolated beta-cyclodextrin monomer was introduced to fabricate a dense and porous poly(thioester) linkage on a commercial membrane surface. The composite membrane exhibited superior separation performance and stability.
Cyclodextrins have been frequently used to fabricate membranes via interfacial polymerization (IP). However, the relatively low reactivity of pristine cyclodextrins often induces a lower cross-linking density and unsatisfactory separation performance. In this work, to introduce a highly active thiolated beta-cyclodextrin (CD-SH) monomer into IP progress, we constructed a dense and porous poly(thioester) linkage on a commercial membrane surface with loose nanofiltration by IP of CD-SH and trimesoyl trichloride (TMC) as the monomer in an aqueous phase and organic phase separately for the first time. Furthermore, the reactivity of CD-SH has been fully demonstrated by the two-phase IP aiming at unmodified beta-CD, a CD-SH/TMC freestanding membrane with a thicker interfacial layer and a smoother surface, and a PAN/CD-SH membrane with a narrow porous distribution. The composite membrane possessed superior separation performance for a high rejection (83.1-99.6%) of different anionic dyes and a low rejection (<20%) of salts, as well as a high-efficiency sieving ability of dye/dye and dye/salt mixtures. The membrane with a poly(thioester) selective layer could steadily operate in a long-term filtration test and exhibit great stability, chloride-resistance performance, and recyclability.
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