Shi Ting, Zheng Yaping, Wang Tianyu, Li Peipei, Wang Yudeng, Yao Dongdong
Department of Applied Chemistry, School of Natural and Applied Science, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China.
Chemphyschem. 2018 Jan 5;19(1):130-137. doi: 10.1002/cphc.201700842. Epub 2017 Dec 18.
Porous liquids are an expanding class of material that has huge potential in gas separation and gas adsorption. Pore size has a dramatic influence on the gas adsorption of porous liquids. In this article, we chose hollow silica nanoparticles as cores, 3-(trihydroxysilyl)-1-propanesulfonic acid (SIT) as corona, and inexpensive industrial reagent polyether amine (M2070) as canopy to obtain a new type of porous liquids. Hollow silica nanospheres with different pore sizes were chosen to investigate the influence of porosity size on CO adsorption capacity of porous liquids. Their chemical structure, morphology, thermal behavior and possible adsorption mechanism are discussed in detail. It was proved that with similar grafting density, porous liquid that has bigger pore size possesses a better CO adsorption capacity (2.182 mmol g under 2.5 MPa at 298 K). More than that, this article demonstrates a more facile and low-cost method to obtain porous liquids with good CO adsorption capacity, recyclability, and huge variability.
多孔液体是一类不断发展的材料，在气体分离和气体吸附方面具有巨大潜力。孔径对多孔液体的气体吸附有显著影响。在本文中，我们选择中空二氧化硅纳米颗粒作为核，3-(三羟基甲硅烷基)-1-丙烷磺酸（SIT）作为冠层，以及廉价的工业试剂聚醚胺（M2070）作为覆盖层，以获得一种新型多孔液体。选择具有不同孔径的中空二氧化硅纳米球来研究孔隙度大小对多孔液体CO吸附容量的影响。详细讨论了它们的化学结构、形态、热行为和可能的吸附机理。结果表明，在相似的接枝密度下，孔径较大的多孔液体具有更好的CO吸附容量（在298K、2.5MPa下为2.182 mmol g）。不仅如此，本文展示了一种更简便、低成本的方法来获得具有良好CO吸附容量、可回收性和巨大可变性的多孔液体。
