One-pot synthesis of activated porous graphitic carbon spheres with cobalt nanoparticles
One-pot synthesis of activated porous graphitic carbon spheres with cobalt nanoparticles
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DOI：
10.1016/j.colsurfa.2019.123884
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发表时间：
2019-12-05
影响因子：
5.2
通讯作者：
Jaroniec, Mietek
中科院分区：
文献类型：
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作者：
Dassanayake, Arosha C.;Goncalves, Alexandre A. S.;Jaroniec, Mietek
氮掺杂的多孔石墨碳球由于其独特的性质如高表面积、可调孔隙率以及重要的是其低成本而被广泛研究用于各种应用如吸附、催化、能量储存和药物递送。在可用于合成石墨碳的许多策略中，催化石墨化由于其工业可行性而被广泛探索。此外，具有细微孔的活性炭在环境条件下被广泛研究用于CO2捕获。在这种情况下，碳球的原位活化是有希望的，因为它在一个步骤中结合了碳化和活化。本研究采用改良的Stober-like一锅法合成原位活性石墨碳球（AGCS），并将温度处理限制在一个步骤内。合成中添加了醋酸钴和柠檬酸钾，前者充当石墨化催化剂，后者充当活化剂。通过扫描电镜、透射电镜、氮吸附、热重分析、元素分析、红外光谱和X射线衍射等手段对碳球进行了表征。这些球除了具有石墨和磁性外，还具有高体积的超微孔。AGCS能够在0 ℃和1巴下吸附约5 mmol.g（-1）的CO2。
Nitrogen doped porous graphitic carbon spheres have been extensively studied for various applications such as adsorption, catalysis, energy storage, and drug delivery due to their unique properties such as high surface area, tunable porosity, and importantly their low cost. Among many strategies available for the synthesis of graphitic carbons, catalytic graphitization is widely explored due to its industrial feasibility. Additionally, activated carbons with fine micropores are vastly studied for CO2 capture at ambient conditions. In this case, in-situ activation of carbon spheres is promising because it combines both carbonization and activation in a single-step. This study is focused on the development of in-situ activated graphitic carbon spheres (AGCSs) by adopting a one-pot modified Stober-like synthesis and restricting temperature treatment to a single step. Cobalt acetate and potassium citrate were added in the synthesis, where the former acted as a graphitization catalyst, while the latter acted as an activator. The resulting carbon spheres were characterized by scanning and transmission electron microscopy, nitrogen adsorption, thermogravimetry, elemental analysis, infrared spectroscopy, and X-ray diffraction. These spheres possess high volumes of ultramicropores in addition to graphitic and magnetic properties. AGCSs were able to adsorb about 5 mmol.g(-1) of CO2 at 0 degrees C and 1 bar.