Micro/Mesoporous Activated Carbons Derived from Polyaniline: Promising Candidates for CO2 Adsorption

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• 作者：Ana Silvestre-Albero ; Joaquin Silvestre-Albero ; Manuel Mart铆nez-Escandell ; Francisco Rodr铆guez-Reinoso
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：53
• 期：40
• 页码：15398-15405
• 全文大小：404K
• ISSN：1520-5045

文摘

A series of activated carbons were prepared by carbonization of polyaniline at different temperatures, using KOH or K₂CO₃ as activating agent. Pure microporous or micro/mesoporous activated carbons were obtained depending on the preparation conditions. Carbonization temperature has been proven to be a key parameter to define the textural properties of the carbon when using KOH. Low carbonization temperatures (400鈥?50 掳C) yield materials with a highly developed micro- and mesoporous structure, whereas high temperatures (800 掳C) yield microporous carbons. Some of the materials prepared using KOH exhibit a BET surface area superior to 4000 m²/g, with total pore volume exceeding 2.5 cm³/g, which are among the largest found for activated carbons. On the other hand, microporous materials are obtained when using K₂CO₃, independently of carbonization temperature. Some of the materials were tested for CO₂ capture due to their high microporosity and N content. The adsorption capacity for CO₂ at atmospheric pressure and 0 掳C achieves a value of 鈭?.6 mmol CO₂/g, which is among the largest reported in the literature. This study provides guidelines for the design of activated carbons with a proper N/C ratio for CO₂ capture at atmospheric pressure.