Microporosity development in phenolic resin-based mesoporous carbons for enhancing CO2 adsorption at ambient conditions
Microporosity development in phenolic resin-based mesoporous carbons for enhancing CO2 adsorption at ambient conditions
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DOI：
10.1016/j.apsusc.2013.11.051
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发表时间：
2014-01
影响因子：
6.7
通讯作者：
J. Choma;K. Jedynak;Weronika Fahrenholz;Jowita Ludwinowicz;M. Jaroniec
中科院分区：
文献类型：
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作者：
J. Choma;K. Jedynak;Weronika Fahrenholz;Jowita Ludwinowicz;M. Jaroniec
采用软模板法制备了介孔炭。在盐酸和柠檬酸存在下的合成涉及间苯二酚和甲醛作为碳前体和三嵌段共聚物Pluronic F127作为模板。所合成的样品在流动氮气中在各种温度下进行碳化;即600 °C、700 °C和800 °C。两条路线被用来开发微孔中孔碳研究。第一种方法是在反应体系中加入正硅酸乙酯。用NaOH溶解二氧化硅后，观察到微孔率增加。第二种方法，在700 °C下用KOH化学活化，被探索作为产生微孔的替代方法。值得注意的是，TEOS的添加不仅导致微孔的发展，而且导致中孔性的一些改善。合成后的KOH活化导致更显着增加的微孔性相比，通过TEOS辅助合成得到的样品。活性炭的中孔体积略低于中孔炭。两种方法都产生具有良好吸附性能的微孔-介孔碳;例如，在TEOS存在下制备的碳的情况下，最好的样品表现出1463 m2/g的BET表面积和1.31 cm 3/g的总孔体积。KOH活性炭的最佳吸附参数为：比表面积1906 m2/g，总孔容0.98cm3/g。这两种用于微孔开发的程序提供了具有良好吸附性能的碳，可用于CO2吸附，空气和水净化等应用。
Soft-templating method was used to prepare mesoporous carbons. The synthesis in the presence of hydrochloric and citric acids involved resorcinol and formaldehyde as carbon precursors and triblock copolymer Pluronic F127 as a template. The as-synthesized samples underwent carbonization in flowing nitrogen at various temperatures; namely 600 °C, 700 °C and 800 °C. Two routes were used to develop microporosity in the mesoporous carbons studied. The first one involved introduction of tetraethyl orthosilicate to the reaction system. After silica dissolution with NaOH, an increase in microporosity was observed. The second method, chemical activation with KOH at 700 °C, was explored as an alternative approach to create microporosity. It is noteworthy that the TEOS addition not only led to the development of microporosity but also to some improvement of mesoporosity. The post-synthesis KOH activation resulted in more significant increase in the microporosity as compared to the samples obtained by TEOS-assisted synthesis. The mesopore volume was somewhat lower for activated carbons as compared to that in mesoporous carbons. Both methods resulted in micro-mesoporous carbons with good adsorption properties; for instance, in the case of carbons prepared in the presence of TEOS, the best sample exhibited BET surface area of 1463 m2/g and the total pore volume of 1.31 cm3/g. For the KOH activated carbons the best adsorption parameters were as follows: the specific surface area = 1906 m2/g, and the total pore volume = 0.98 cm3/g. Both procedures used for microporosity development afforded carbons with good adsorption properties that can be useful for applications such as CO2adsorption, air and water purification.