Abstract：
In this study, an innovative and cost-effective ionic polymer for CO2 capture and utilization for the first time, using abundant and nonfood-based biomass lignin is reported. The modified ionic polymer synthesizes through the reaction of glycidyltrimethylammonium chloride with lignin under alkaline conditions to yield quaternary ammonium ionic functionality. Subsequently, the hydroxide-based pure ionic lignin polymer is employed for CO2 capture from both direct air and concentrated CO2 sources at room temperature and atmospheric pressure. Structural characterization of the polymers is accomplished through 1H, 13C, and 2D-heteronuclear single quantum coherence (HSQC) NMR, and FT-IR spectroscopy. The CO2 capture process is established through the formation of bicarbonate ions alongside the presence of CO2. The captured CO2 is precisely quantified by using inverse-gated proton decoupled 13C NMR with an internal standard (trioxane). Remarkably, the captured-CO2 amounts of ionic lignin polymer are 1.06 mmol g-1 (47 mg g-1) from concentrated-CO2 source and 0.60 mmol g-1 (26 mg g-1) from direct-air. The captured-CO2 in ionic lignin polymer is released in controlled manner and utilized in the synthesis of cyclic carbonate, showcasing the productive application of the captured carbon. Moreover, the fully controlled recovering of ionic lignin polymer achieves via repeated CO2 release ↔ CO2 capture.
摘要：
在这项研究中,首次用于二氧化碳捕获和利用的创新且具有成本效益的离子聚合物，据报道，使用丰富的非食品生物质木质素。改性的离子聚合物通过缩水甘油基三甲基氯化铵与木质素在碱性条件下的反应来合成以产生季铵离子官能团。随后，基于氢氧化物的纯离子木质素聚合物用于在室温和大气压下从直接空气和浓缩CO2源中捕获CO2。聚合物的结构表征是通过1H，13C,和2D-异核单量子相干（HSQC）NMR，和FT-IR光谱。CO2捕获过程是通过在CO2的存在下形成碳酸氢根离子而建立的。通过使用具有内标(三恶烷)的反向门控质子去耦13CNMR来精确定量捕获的CO2。值得注意的是,离子木质素聚合物的捕获CO2量为来自浓缩CO2源的1.06mmolg-1（47mgg-1）和来自直接空气的0.60mmolg-1（26mgg-1）。离子木质素聚合物中捕获的CO2以可控方式释放并用于环状碳酸酯的合成，展示了捕获碳的生产应用。此外，离子木质素聚合物的完全控制回收通过重复CO2释放↔CO2捕获来实现。
