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Efficient, Selective, and Reversible SO 2 Capture with Highly Crosslinked Ionic Microgels via a Selective Swelling Mechanism
Author(s) -
Xia Ling,
Cui Qing,
Suo Xian,
Li Yuhui,
Cui Xili,
Yang Qiwei,
Xu Jianhong,
Yang Yiwen,
Xing Huabin
Publication year - 2018
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201704292
Subject(s) - swelling , materials science , physisorption , chemical engineering , adsorption , ionic liquid , dispersity , microfluidics , selectivity , ionic bonding , desorption , differential scanning calorimetry , selective adsorption , porous medium , monomer , polymer , nanotechnology , porosity , polymer chemistry , organic chemistry , catalysis , chemistry , composite material , engineering , physics , thermodynamics , ion
Abstract SO 2 capture through physisorption is a promising environmental benign technology to eliminate the emission of SO 2 . However, designing an efficient adsorption material with high capacity and selectivity of SO 2 as well as excellent reversibility remains challenging. Here, a class of highly crosslinked nonporous poly(ionic liquid)s (PILs) xerogels is prepared with high ionic density by photopolymerization of Gemini IL monomers and a microfluidic technology is further explored to prepare the corresponding monodisperse PIL microgels with uniform and controllable sizes at the diameter range from 43 to 250 µm. This kind of novel dense nonporous ionic xerogels/microgels completely exclude the adsorption of common gases (CO 2 , CH 4 , etc.), but exhibit very high SO 2 adsorption capacity (498 mg g −1 ) via selective swelling mechanism. Unprecedented SO 2 /CO 2 and SO 2 /CH 4 uptake selectivities with the value up to 614 and 1992, respectively, are achieved. The selective swelling mechanism is validated by optical microscope and differential scanning calorimetry measurements. More importantly, these kinds of xerogels show excellent reversibility in adsorption–desorption cycles. Column breakthrough experiments confirm the excellent performance of these PIL xerogels in SO 2 capture. This work demonstrates that designing a nonporous material that has specific swelling interactions with certain molecules can be an effective strategy for realizing extremely high selectivity.