Multifunctional group sulfobutyl ether β-cyclodextrin polymer treated CNT as the cathode for enhanced performance in asymmetric capacitive deionization
作者： Dongya Ma , Yue Wang , Yanmeng Cai , Shichang Xu , Jixiao Wang
DOI: 10.1016/J.ELECTACTA.2019.05.041
关键词: Adsorption 、 Ether 、 Inorganic chemistry 、 Ion 、 Selectivity 、 Capacitive deionization 、 Carbon nanotube 、 Electrode 、 Cathode 、 Materials science
摘要: Abstract In order to enhance the desalting performance of electrode in capacitive deionization process (CDI), a novel sulfobutyl ether β-cyclodextrin polymer with multi-sulfonic groups and multi-hydroxyl (SBE-β-CDP) was successfully synthesized attached on surface carbon nanotubes (CNT) by non-covalent bond. The as-prepared CNT@SBE-β-CDP possesses significantly improved capacitance property hydrophilicity (60.9 F/g, 65.5°) as compared CNT (51.7 F/g, 103.6°), which indicates that can provide efficient ion transfer pathway synergistic effect. symmetric asymmetric CDI cells, named R‖R, R(+)‖R-CDP(−) R-CDP(+)‖R(−), were assembled (R) (R-CDP). Based electroneutrality principle electrode, theoretical analysis about adsorption these cells balancing ionic charge, electronic charge chemical demonstrates when is used cathode, efficiency reaches maximum R(+)‖R-CDP(−). experiments, average salt capacity for (6.37 mg/g, 36.9%) surpass those R‖R (4.17 mg/g, 25.8%) R-CDP(+)‖R(−) (3.11 mg/g, 17.3%). These facts confirm good cation selectivity strengthens process.
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