Synthesis and Adsorption Characteristics of Nanoporous Graphite-Derived Carbon-Silica Composites
Tóm tắt
A novel nanoporous C/SiO2 composite was synthesized using graphite precursor by a soft chemical method and its adsorption properties were characterized by nonane, water, and nitrogen adsorption. It was found that only one part of micropores can strongly confine nonane molecules, indicating a wide micropore size distribution. Water adsorption leads to disappearance of one part of micropores, possibly due to closing of pores by dissociative adsorption of water on defective sites. Fractal analysis of the original and the differential nitrogen adsorption isotherms indicate that micropores have a rougher surface and mesopore a flatter surface, suggesting that micropores are surrounded by silica particles and mesopores involve the flat carbon layers.
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