Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan.
Langmuir. 2011 Jul 5;27(13):8090-8. doi: 10.1021/la201745y. Epub 2011 Jun 13.
Commercially available multiwalled carbon nanotubes (CNTs) were functionalized with a high mass load of 3-aminopropyltriethoxysilane (APTS) to study their behaviors in the cyclic CO(2) adsorption as well as the associated thermodynamic properties. The breakthrough curve showed a fast kinetics of CO(2) adsorption resulting in percentage ratios of working capacity to equilibrium capacity greater than 80%. The adsorption capacity of CNT(APTS) was significantly influenced by the presence of water vapor and reached a maximum of 2.45 mmol/g at a water vapor of 2.2%. The adsorption capacities and the physicochemical properties of CNT(APTS) were preserved through 100 adsorption-desorption cycles displaying the stability of CNT(APTS) during a prolonged cyclic operation. The heat input required to regenerate spent CNT(APTS) was determined, and the result suggests that adsorption process with solid CNT(APTS) is possibly a promising CO(2) capture technology.
商业上可获得的多壁碳纳米管 (CNTs) 用高质量负载的 3-氨丙基三乙氧基硅烷 (APTS) 进行功能化，以研究它们在循环 CO(2) 吸附中的行为以及相关的热力学性质。突破曲线显示 CO(2) 吸附的动力学很快，导致工作容量与平衡容量的百分比比值大于 80%。水蒸气的存在显著影响 CNT(APTS) 的吸附容量，在水蒸气为 2.2%时达到最大 2.45mmol/g。通过 100 次吸附-解吸循环，保持了 CNT(APTS) 的吸附容量和物理化学性质，显示了 CNT(APTS) 在长时间循环操作中的稳定性。确定了再生用过的 CNT(APTS)所需的热量输入，结果表明，使用固体 CNT(APTS)的吸附过程可能是一种很有前途的 CO(2)捕获技术。
