Abstract
Monolithic carbon cryogels having a honeycomb structure with pore openings a few tens of micrometers in diameter (Carbon MicroHoneycomb, CMH) were synthesized by directional freezing of precursor resorcinol–formaldehyde (RF) hydrogels and subsequent carbonization at temperatures ≥ 674 K. Aging of precursor RF monoliths with 1 N HCl aq. was found to markedly increase the hydrophobicity of the corresponding CMHs as characterized by water vapor adsorption experiments conducted at 298 K. Analysis of the water vapor adsorption data indicates that levels of hydrophobicity of CMHs are similar to those exhibited by other types of highly hydrophobic adsorbents, such as a coal-derived activated carbon and a defect-free pure silica zeolite Beta. HCl aging also drastically changes the porous structure of CMHs from microporous to micro/mesoporous as characterized by nitrogen adsorption/desorption experiments. Because of significantly enhanced hydrophobicity of CMHs as well as hierarchical pore structure (straight macr...
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