| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 96 === Carbon nanotubes (CNTs) and Mesoporous silica particles (MSPs) were treated by APTS ((3-aminopropyl)triethoxysilane)、EDA (N-[3-(trimethoxysilyl)propyl]ethylene-
diamine) and PEI (polyethylenemine) solutions and were selected as adsorbents to study their characterizations and adsorption properties of carbon dioxide from air streams.
The physicochemical properties of adsorbents were changed after modification by different modifity agents. These modifications include the increase in surface functional groups and surface basic sites, which enhance the chemisorption capacity of CO2. The 50% CO2 inlet concentration of adsorption capacities are respectively 161.5 and 125.3 mg/g for CNTs and MSPs and 184.3 and 152.4 mg/g for CNTs(APTS) and MSPs(EDA), respectively. The CNTs(APTS) and MSPs(EDA) shows the greatest enhancement of CO2 adsorption. In the temperature range of 20 to 100℃, the adsorption capacities of CNTs and CNTs(APTS) decreased with a rise in temperature and which of MSPs and MSPs(EDA) have the best adsorption performance of CO2 at 60℃. The CNTs(APTS) was no effective in the absence and presence of water vapor, but MSPs(EDA) was not. After 20 recylic adsorptions, the recoveries of CNTs(APTS) shows no decay, but which of MSPs(EDA) decreased 7%. It is the fact that the CNTs(APTS) leads the adsorption of CO2 that has the greater adsorption capacity, no influence in present of humidity and more thermostability than MSPs(EDA).
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