Center for Urban Energy Systems, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
J Hazard Mater. 2013 Apr 15;250-251:53-60. doi: 10.1016/j.jhazmat.2013.01.035. Epub 2013 Feb 1.
Novel silica support has been required for high amine loading and good CO2 molecule diffusion into its pores to increase the performance of CO2 adsorbents. Herein, amine groups supported on double-walled silica nanotubes (DWSNTs) have been prepared via the immobilization of various aminosilanes (primary, secondary, tertiary, di-, and tri-aminosilanes) on DWSNT, and found to be a very effective adsorbent for CO2 capture. Amine groups immobilized DWSNTs captured CO2 reversibly in a temperature swing process at various adsorption temperatures (25°C, 50°C, 75°C, and 100°C). The amines on modified DWSNTs showed high CO2 capture capacity in the order of tri-, di-, primary, secondary, and tertiary amines. The CO2 capture capacity of all aminosilanes immobilized DWSNTs decreased linearly with the increase of the adsorption temperature. We expect that DWSNT would be able to inspire researchers to use it not only as a support for CO2 capture but also as a promising candidate for various applications.
新型二氧化硅载体需要具有高胺载量和良好的 CO2 分子扩散进入其孔道的性能，以提高 CO2 吸附剂的性能。在此，通过将各种氨基硅烷（伯、仲、叔、二胺和三胺）固定在双壁二氧化硅纳米管（DWSNT）上，制备了负载在 DWSNT 上的胺基，发现其是一种非常有效的 CO2 捕获吸附剂。胺基固定的 DWSNT 在各种吸附温度（25°C、50°C、75°C 和 100°C）下的温度波动过程中可可逆地捕获 CO2。改性 DWSNT 上的胺基按三胺、二胺、伯胺、仲胺和叔胺的顺序表现出高的 CO2 捕获容量。所有氨基硅烷固定的 DWSNT 的 CO2 捕获容量随吸附温度的升高呈线性下降。我们期望 DWSNT 不仅能够激发研究人员将其用作 CO2 捕获的载体，而且还能成为各种应用的有前途的候选材料。
