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首页> 外文期刊>ACS applied materials & interfaces >2D/3D Assemblies of Amine-Functionalized Graphene Silica (Templated) Aerogel for Enhanced CO2 Sorption
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2D/3D Assemblies of Amine-Functionalized Graphene Silica (Templated) Aerogel for Enhanced CO2 Sorption

机译：2D / 3D组件的胺官能化石墨烯二氧化硅（模板）气凝胶，用于增强CO2吸附

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This work investigates the one-pot facile synthesis of novel 2D/3D assemblies containing graphene silica (templated) aerogel sorbents for CO2 capture, a greenhouse gas of major global concern. In this synthesis, 3D silica (templated) aerogels were formed along the planes of 2D graphene sheets, resulting in 2D/3D assemblies of flake-like shapes. The templates were burnt off from the 2D/3D assembly, leaving a mesoporous cavity which increased with the carbon chain length used in the synthesis method. As such, morphological features related to surface area and total pore volume increased significantly by over 80% as compared to blank (no template) samples and reached maximum values of 734 m(2) g(-1) and 0.42 cm(3) g(-1), respectively. The increase in total pore volume allowed for higher content of impregnated amine into the 2D/3D assembly followed by a freeze-drying method. The CO2 sorption capacity of the amine-functionalized 2D/3D assemblies reached high values at 4.9 mmol g(-1) (mass over weight ratio), equivalent to 11.67 mmol cm(-3) (mass over total pore volume ratio). The amine-functionalized 2D/3D assemblies were stable over 10 cycles of CO2 sorption and desorption. Further, heat of sorption results were generally low, with the lowest value reaching 59 kJ mol(-1). These results are desirable for the deployment of 2D/3D assemblies as sorbents to capture CO2.
机译：该工作调查了含有石墨烯二氧化硅（模板化）气凝胶的新型2D / 3D组件的单罐容易合成，用于CO2捕获，是主要全球主要关注的温室气体。在该合成中，沿着2D石墨烯片的平面形成3D二氧化硅（模板化）气凝胶，导致薄片状形状的2D / 3D组件。将模板从2D / 3D组件中烧掉，留下介孔腔，其随着合成方法中使用的碳链长而增加。因此，与坯料（无模板）样品相比，与表面积和总孔体积相关的形态学特征在80％以上增加了80％，并且达到了734m（2）g（-1）和0.42cm（3）g的最大值（-1）分别。将孔体积的总含量增加浸渍胺的浸渍胺含量较高，然后是冷冻干燥方法。胺官能化的2D / 3D组件的CO2吸附能力在4.9mmol g（-1）（质量超过重量比）的高值达到高值，相当于11.67mmol cm（-3）（质量超过总孔体积比）。胺官能化的2D / 3D组件在10个CO 2吸附和解吸的10个循环中稳定。此外，吸附的热量通常低，最低值达到59 kJ摩尔（-1）。这些结果对于将2D / 3D组件部署作为吸附剂来捕获CO2。

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