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    Highly Stable Porous Covalent Triazine-Piperazine Linked Nanoflower as a Feasible Adsorbent for Flue Gas CO2 Capture

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    1-s2.0-S0009250916300525-main.pdf
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    Description:
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    Type
    Article
    Authors
    Das, Swapan Kumar cc
    Wang, Xinbo
    Ostwal, Mayur
    Zhao, Yunfeng cc
    Han, Yu cc
    Lai, Zhiping cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Engineering Program
    Chemical Science Program
    Nanostructured Functional Materials (NFM) laboratory
    Office of the VP
    Physical Science and Engineering (PSE) Division
    Date
    2016-02-13
    Online Publication Date
    2016-02-13
    Print Publication Date
    2016-05
    Permanent link to this record
    http://hdl.handle.net/10754/596179
    
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    Abstract
    Here, we report a porous covalent triazine-piperazine linked polymer (CTPP) featuring 3D nanoflower morphology and enhanced capture/removal of CO2, CH4 from air (N2), essential to control greenhouse gas emission and natural gas upgrading. 13C solid-state NMR and FTIR analyses and CHN and X-ray photoelectron spectroscopy (XPS) elemental analyses confirmed the integration of triazine and piperazine components in the network. Scanning electron microscopic (SEM) and transmission electron microscopic (TEM) analyses revealed a relatively uniform particle size of approximately 400 to 500 nm with 3D nanoflower microstructure, which was formed by the self-assembly of interwoven and slight bent nanoflake components. The material exhibited outstanding chemical robustness under acidic and basic medium and high thermal stability up to 773 K. The CTPP possess high surface area (779 m2/g) and single-component gas adsorption study exhibited enhanced CO2 and CH4 uptake of 3.48 mmol/g, 1.09 mmol/g, respectively at 273 K, 1 bar; coupled with high sorption selectivities for CO2/N2 and CH4/N2 of 128 and 17, respectively. The enriched Lewis basicity of the CTPP favors the interaction with CO2, which results in an enhanced CO2 adsorption capacity and high CO2/N2 selectivity. The binary mixture breakthrough study for the flue gas composition at 298 K showed a high CO2/N2 selectivity of 82. CO2 heats of adsorption for the CTPP (34 kJ mol−1) were realized at the borderline between strong physisorption and weak chemisorption (QstCO2; 25−50 kJ mol−1) and low Qst value for N2 (22.09 kJ mol−1), providing the ultimate validation for the high selectivity of CO2 over N2.
    Citation
    Highly Stable Porous Covalent Triazine-Piperazine Linked Nanoflower as a Feasible Adsorbent for Flue Gas CO2 Capture 2016 Chemical Engineering Science
    Publisher
    Elsevier BV
    Journal
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2016.02.007
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0009250916300525
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ces.2016.02.007
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Science Program; Chemical Engineering Program

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