Insights into the Critical Role of Abundant-Porosity Supports in Polyethylenimine Functionalization as Efficient and Stable CO2 Adsorbents

• DOI: 10.1021/acsami.1c17132
• Publication Date: 2021-11-03T08:23:34Z
• Authors: Yuan Meng; Tongyao Ju; Fanzhi Meng; Siyu Han; Mengzhu Song; Jianguo Jiang
• Keywords: Polyethylenimine; Surface Modification; Degradation

The emerging polyethylenimine (PEI)-functionalized solid adsorbents have witnessed significant development in the implementation of CO2 capture and separation because their decent adsorption capacity, recyclability, scalability. As an indispensable substrate, importance selecting porous supports PEI functionalization for was commonly overlooked many previous investigations, which instead emphasized screening amine types or developing complex materials. To this end, we scrutinized critical role different commercial (silica, alumina, activated carbon, polymeric resins) impregnation study, taking into account multiple perspectives. Hereinto, present results identified that abundant larger pore structures surface functional groups were conducive to loading a considerable amount molecules. Various after had great differences capacities, efficiencies, corresponding optimal temperatures. In addition, more attention paid long-term stability during consecutive adsorption-regeneration cycles, while N2 purging as regeneration strategies, respectively. Especially, CO2-induced degradation due urea species formation specifically recognized SiO2-based adsorbent, would induce serious concerns cyclic capture. On other side, also confirmed adopting conventional supports, example, HP20, could achieve superior performance (above 4 mmol CO2/g) (around 1% loss 30 cycles) rather than ones synthesized through approaches, ensured availability scalability PEI-functionalized adsorbents.