期刊
ACS APPLIED MATERIALS & INTERFACES
卷 15, 期 36, 页码 43193-43204出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c09390
关键词
interfacial polymerization; highly active thiolated beta-cyclodextrin; poly(thioester) linkage; loose nanofiltration; chlorine resistance
In this study, a dense and porous poly(thioester) linkage was successfully constructed on a commercial membrane surface using CD-SH and TMC as monomers via interfacial polymerization in separate aqueous and organic phases. The resulting composite membrane exhibited superior separation performance with high rejection rates for different anionic dyes and low rejection rates for salts, as well as high-efficiency sieving ability for dye/dye and dye/salt mixtures.
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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