Spherical amine grafted silica aerogels for CO2 capture,RSC Advances

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Spherical amine grafted silica aerogels for CO2 capture
RSC Advances ( IF 3.9 ) Pub Date : 2020-7-9 , DOI: 10.1039/d0ra04497k
Xing Jiang _{1,

2} , Yong Kong _{1,

2} , Zhiyang Zhao _{1,

2} , Xiaodong Shen _{1,

2,

3}

Affiliation

The objective of this research was to develop a novel spherical amine grafted silica aerogel for CO₂ capture. A spherical silica gel was synthesized by dropping a sodium silicate based silica sol into an oil bath. Amine grafting was achieved by bonding 3-aminopropyltriethoxysilane onto the framework of the silica gel. The spherical amine grafted silica gels were dried using vacuum drying to prepare the spherical amine grafted silica aerogels (SASAs). The synthetic mechanism of the SASAs was proposed. The structures and the CO₂ adsorption performances of SASAs were researched. The amine loading of the SASAs increased with the grafting time, however, the specific surface area and pore volume sharply decreased owing to the blockage of the pore space. Excess amine loading led to the decrease of the CO₂ adsorption capacity. The optimal CO₂ adsorption capacity was 1.56 mmol g⁻¹ with dry 1% CO₂ and at 35 °C. This work provides a low-cost and environmentally friendly way to design a capable and regenerable adsorbent material.

中文翻译：

用于二氧化碳捕获的球形胺接枝二氧化硅气凝胶

本研究的目的是开发一种新型球形胺接枝二氧化硅气凝胶，用于 CO ₂捕获。通过将硅酸钠基二氧化硅溶胶滴入油浴中合成球形硅胶。胺接枝是通过将 3-氨基丙基三乙氧基硅烷键合到硅胶骨架上来实现的。使用真空干燥法干燥球形胺接枝硅胶以制备球形胺接枝二氧化硅气凝胶（SASAs）。提出了SASA的合成机理。结构和 CO ₂研究了 SASA 的吸附性能。SASAs的胺负载量随着接枝时间的增加而增加，但由于孔隙空间的堵塞，比表面积和孔体积急剧下降。过量的胺负载导致CO ₂吸附容量的降低。最佳CO ₂吸附容量为1.56 mmol g ^-1与干燥的1% CO ₂和在35°C。这项工作提供了一种低成本且环保的方法来设计一种功能强大且可再生的吸附材料。

更新日期：2020-07-09

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