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Lightweight, flexible, and multifunctional anisotropic nanocellulose-based aerogels for CO 2 adsorption
Cellulose ( IF 4.9 ) Pub Date : 2020-01-03 , DOI: 10.1007/s10570-019-02935-7
Jiayuan Wei , Shiyu Geng , Jonas Hedlund , Kristiina Oksman

CO2 adsorption is a promising strategy to reduce costs and energy use for CO2 separation. In this study, we developed CO2 adsorbents based on lightweight and flexible cellulose nanofiber aerogels with monolithic structures prepared via freeze-casting, and cellulose acetate or acetylated cellulose nanocrystals (a-CNCs) were introduced into the aerogels as functional materials using an impregnation method to provide CO2 affinity. The microstructure of the adsorbent was examined using scanning electron microscopy, and compression tests were performed to analyze the mechanical properties of the adsorbents. The CO2 adsorption behavior was studied by recording the adsorption isotherms and performing column breakthrough experiments. The samples showed excellent mechanical performance and had a CO2 adsorption capacity of up to 1.14 mmol/g at 101 kPa and 273 K. Compared to the adsorbent which contains cellulose acetate, the one impregnated with a-CNCs had better CO2 adsorption capacity and axial mechanical properties owing to the building of a nanoscale scaffold on the surface of the adsorbent. Although the CO2 adsorption capacity could be improved further, this paper reports a potential CO2 adsorbent that uses all cellulose-based materials, which is beneficial for the environment from both resource and function perspectives. Moreover, the interesting impregnation process provides a new method to attach functional materials to aerogels, which have potential for use in many other applications.

中文翻译:

轻巧,灵活,多功能的各向异性纳米纤维素基气凝胶,可吸附CO 2

CO 2吸附是降低CO 2分离成本和能耗的一种有前途的策略。在这项研究中,我们开发了基于轻质和柔性的纤维素纳米纤维气凝胶的CO 2吸附剂,该气凝胶具有通过冷冻铸造制备的整体结构,并且使用浸渍法将醋酸纤维素或乙酰化纤维素纳米晶体(a-CNC)作为功能材料引入到气凝胶中提供CO 2亲和力 使用扫描电子显微镜检查吸附剂的微观结构,并进行压缩测试以分析吸附剂的机械性能。一氧化碳2通过记录吸附等温线并进行柱穿透实验研究吸附行为。样品表现出优异的机械性能,在101 kPa和273 K下的CO 2吸附容量高达1.14 mmol / g。与含乙酸纤维素的吸附剂相比,浸渍有a-CNC的吸附剂具有更好的CO 2吸附能力和由于在吸附剂表面上建立了纳米级支架,因此具有轴向机械性能。尽管可以进一步提高CO 2的吸附能力,但本文报道了潜在的CO 2使用所有基于纤维素的材料的吸附剂,从资源和功能的角度来看对环境都是有益的。此外,有趣的浸渍工艺提供了一种将功能性材料连接到气凝胶的新方法,而气凝胶具有在许多其他应用中使用的潜力。
更新日期:2020-01-04
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