Pyrene‐Derived Carbon Nanomembranes Selectively Pass Metal Ions in Water
نویسندگان
چکیده
Despite the potential environmental benefits, use of membranes for extracting, reclaiming, and purifying alkali metals from aqueous feedstocks remains challenging due to low inter-cation selectivity. Two-dimensional materials equipped with nanoscale pores have revealed intriguing performance in ion separation, but their practical implementation is bottlenecked by perforation procedures. This work presents electrodialysis experiments intrinsically porous carbon nanomembranes (CNMs) that are featured a high areal density sub-nanometer channels. The free-standing prepared pyrene shown great mechanical strength narrow pore size distribution enabling selective passage metal ions. CNMs can sieve hydrated cations following order K+ > Na+ Li+ Ca2+ Mg2+, while K+/Mg2+, Na+/Mg2+, Li+/Mg2+ selectivity amounts 220, 86, 13 respectively. It found transport attributed combined effect small dimensions electrostatic exclusion induced surface charges. has been also observed membrane thickness range 3 6.5 nm little impact on which suggests interesting implications batteries other energy conversion systems.
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ژورنال
عنوان ژورنال: Advanced Materials Interfaces
سال: 2022
ISSN: ['2196-7350']
DOI: https://doi.org/10.1002/admi.202201385