Fast and reversible direct CO2 capture from air onto all-polymer nanofibrillated cellulose-polyethylenimine foams.
Fast and reversible direct CO2 capture from air onto all-polymer nanofibrillated cellulose-polyethylenimine foams.
复制标题
DOI：
10.1021/es504396v
复制
发表时间：
2015-02
影响因子：
11.4
通讯作者：
H. Sehaqui;M. Gálvez;Viola Becatinni;Yi cheng Ng;A. Steinfeld;T. Zimmermann;P. Tingaut
中科院分区：
文献类型：
--
作者：
H. Sehaqui;M. Gálvez;Viola Becatinni;Yi cheng Ng;A. Steinfeld;T. Zimmermann;P. Tingaut
采用冷冻干燥法制备了由氧化纳米纤化纤维素（NFC）和高摩尔质量聚乙烯亚胺（PEI）组成的全聚合生物基CO2吸附剂。这导致NFC/PEI泡沫呈现出孔隙率超过97%的片状结构，比表面积在2.7-8.3 m(2)·g（-1）之间。在大气条件下（含CO2 ~ 400ppm的潮湿空气），系统研究了PEI含量和相对湿度对胺功能化吸附剂CO2捕获能力的影响。在80%的相对湿度和44 wt %的最佳PEI含量下，CO2容量为2.22 mmol·g(-1)， 5个循环的稳定性，以及极低的吸附半时间（10.6 min）。在研究的20-80% RH范围内，相对湿度的增加增加了NFC/PEI泡沫的CO2容量，但代价是3.8-28 mmol·g（-1）范围内的高H2O吸收率。
Fully polymeric and biobased CO2 sorbents composed of oxidized nanofibrillated cellulose (NFC) and a high molar mass polyethylenimine (PEI) have been prepared via a freeze-drying process. This resulted in NFC/PEI foams displaying a sheet structure with porosity above 97% and specific surface area in the range 2.7-8.3 m(2)·g(-1). Systematic studies on the impact of both PEI content and relative humidity on the CO2 capture capacity of the amine functionalized sorbents have been conducted under atmospheric conditions (moist air with ∼400 ppm of CO2). At 80% RH and an optimum PEI content of 44 wt %, a CO2 capacity of 2.22 mmol·g(-1), a stability over five cycles, and an exceptionally low adsorption half time of 10.6 min were achieved. In the 20-80% RH range studied, the increase in relative humidity increased CO2 capacity of NFC/PEI foams at the expense of a high H2O uptake in the range 3.8-28 mmol·g(-1).