Jiang Xing, Kong Yong, Zhao Zhiyang, Shen Xiaodong
College of Materials Science and Engineering, Nanjing Tech University Nanjing 210009 P. R. China
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing 210009 P. R. China.
RSC Adv. 2020 Jul 9;10(43):25911-25917. doi: 10.1039/d0ra04497k. eCollection 2020 Jul 3.
The objective of this research was to develop a novel spherical amine grafted silica aerogel for CO 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 CO 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 CO adsorption capacity. The optimal CO adsorption capacity was 1.56 mmol g with dry 1% CO and at 35 °C. This work provides a low-cost and environmentally friendly way to design a capable and regenerable adsorbent material.
本研究的目的是开发一种用于捕获二氧化碳的新型球形胺接枝二氧化硅气凝胶。通过将硅酸钠基硅溶胶滴入油浴中来合成球形硅胶。通过将3-氨丙基三乙氧基硅烷键合到硅胶骨架上来实现胺接枝。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（SASA）。提出了SASA的合成机理。研究了SASA的结构和二氧化碳吸附性能。SASA的胺负载量随接枝时间增加，然而，由于孔隙空间被堵塞，比表面积和孔体积急剧下降。过量的胺负载导致二氧化碳吸附容量降低。在干燥的1%二氧化碳和35℃条件下，最佳二氧化碳吸附容量为1.56 mmol/g。这项工作为设计一种高效且可再生的吸附材料提供了一种低成本且环保的方法。
