Su Fengsheng, Lu Chungsying, Cnen Wenfa, Bai Hsunling, Hwang Jyh Feng
Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan.
Sci Total Environ. 2009 Apr 1;407(8):3017-23. doi: 10.1016/j.scitotenv.2009.01.007. Epub 2009 Feb 7.
Carbon nanotubes (CNTs) were modified by 3-aminopropyl-triethoxysilane (APTS) solution and were tested for its CO2 adsorption potential at multiple temperatures (20-100 degrees C). The physicochemical properties of CNTs were changed after the modification, which makes CNTs adsorb more CO2 gases. The adsorption capacities of CO2 via CNTs and CNTs(APTS) decreased with temperature indicating the exothermic nature of adsorption process and increased with water content in air at 0-7%. The mechanism of CO2 adsorption on CNTs and CNTs(APTS) appears mainly attributable to physical force regardless of temperature change, which makes regeneration of spent CNTs at a relatively low temperature become feasible. The CNTs(APTS) have good adsorption performance of CO2 at 20 degrees C as compared to many types of modified carbon or silica adsorbents documented in the literature. This suggests that the CNTs(APTS) are promising low-temperature adsorbents for CO2 capture from flue gas.
碳纳米管（CNTs）用3-氨丙基三乙氧基硅烷（APTS）溶液进行了改性，并在多个温度（20 - 100摄氏度）下测试了其对二氧化碳的吸附潜力。改性后碳纳米管的物理化学性质发生了变化，这使得碳纳米管能够吸附更多的二氧化碳气体。通过碳纳米管和改性碳纳米管（CNTs(APTS)）对二氧化碳的吸附容量随温度降低，表明吸附过程具有放热性质，并且在空气中水含量为0 - 7%时随水含量增加。无论温度如何变化，二氧化碳在碳纳米管和改性碳纳米管（CNTs(APTS)）上的吸附机制似乎主要归因于物理力，这使得在相对较低温度下对用过的碳纳米管进行再生成为可能。与文献中记载的许多类型的改性碳或二氧化硅吸附剂相比，改性碳纳米管（CNTs(APTS)）在20摄氏度时对二氧化碳具有良好的吸附性能。这表明改性碳纳米管（CNTs(APTS)）是从烟气中捕获二氧化碳的有前景的低温吸附剂。
