Alkyl-chain-tuned hierarchically porous ionic polymers with ultrahigh surface area for CO2 adsorption and conversion

作者：Xuanbo Liu, Xiuli Yan, Shuangshuo Li, Zheng Zhu, Xionglei Wang, Jiajia Yang, Shenjun Qin, Tao Chang, Yongjing Hao · 发表于：Separation and Purification Technology · 年份：2025 · DOI：10.1016/j.seppur.2025.134673 · 被引用次数：3 · 研究领域：Carbon dioxide utilization in catalysis、Ionic liquids properties and applications、Carbon Dioxide Capture Technologies

ABSTRACT Porous ionic polymers (PIPs) featuring high specific surface area ( S BET ) and abundance of ionic active sites have emerged as advanced materials for synergistic CO 2 capture and conversion. In this study, a novel class of hydroamino-functionalized ionic polymers, designed as PHAIPs, was constructed through a one-pot three-component strategy integrating Friedel-Crafts alkylation, quaternization, and nucleophilic epoxide ring-opening reactions. The synthesis employed α , α’ -dibromo-p-xylene, N , N -dimethylethylene diamine and glycidyl-dimethyl-alkyl-ammonium bromide as modular building blocks, facilitating precise control over textural properties. Systematic structural optimization through alkyl chain length variation and reactant stoichiometric adjustments generated ionic polymers with tunable S BET up to 1731 m 2 ·g −1 and hierarchical pore architecture. The optimized PHAIP-C 16 exhibited a moderate CO 2 adsorption capacity of 2.45 mmol·g −1 and a CO 2 /N 2 selectivity factor of 71 at 1 bar, governed by a synergistic Langmuir and Freundlich adsorption mechanism with thermodynamically spontaneous and exothermic characteristics. Notably, the PHAIP-C 16-4/3/1.5 demonstrated particularly effectiveness in CO 2 cycloaddition reactions, achieving an excellent conversion yield of 95.5%. Mechanistic investigations revealed a dual-activation pathway, with bromide anion (Br − ) nucleophilically activated epoxides, while hydroamino groups function as hydrogen-bond donors to ...