Polyurethane Foam-Based Ultramicroporous Carbons for CO2 Capture

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• 作者：Chao Ge ; Jian Song ; Zhangfeng Qin ; Jianguo Wang ; Weibin Fan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：8
• 期：29
• 页码：18849-18859
• 全文大小：761K
• 年卷期：0
• ISSN：1944-8252

文摘

A series of sustainable porous carbon materials were prepared from waste polyurethane foam and investigated for capture of CO₂. The effects of preparation conditions, such as precarbonization, KOH to carbon precursor weight ratio, and activation temperature, on the porous structure and CO₂ adsorption properties were studied for the purpose of controlling pore sizes and nitrogen content and developing high-performance materials for capture of CO₂. The sample prepared at optimum conditions shows CO₂ adsorption capacities of 6.67 and 4.33 mmol·g^–1 at 0 and 25 °C under 1 bar, respectively, which are comparable to those of the best reported porous carbons prepared from waste materials. The HCl treatment experiment reveals that about 80% of CO₂ adsorption capacity arises from physical adsorption, while the other 20% is due to the chemical adsorption originated from the interaction of basic N groups and CO₂ molecules. The relationship between CO₂ uptake and pore size at different temperatures indicates that the micropores with pore size smaller than 0.86 and 0.70 nm play a dominant role in the CO₂ adsorption at 0 and 25 °C, respectively. It was found that the obtained carbon materials exhibited high recyclability and high selectivity to adsorption of CO₂ from the CO₂ and N₂ mixture.