溶融KNO_3により表面改質した活性炭の金属イオン吸着特性

摘要

Activated carbon surfaces were modified using molten KNO_3 to introduce functional groups and form microtextures. Their surface treatment temperatures were 250 - 300℃; the melting point of KNO_3 is 337 ℃. Microtextures formed on the surfaces of the activated carbons during the molten KNO_3 treatment. Furthermore, various functional groups such as -COOH, -COO, and -CO, were observed clearly in XPS spectra of the surface-modified activated carbons. Their metal-ion adsorption ability increased in the order of activated carbon modified at 300 ℃ > activated carbon modified at 250 ℃ > original activated carbon.%炭素材料は，われわれの身近で幅広く利用されている。なかでも，安価で大量生産できる活性炭は，きわめて大きな比表面積をもち，気相および液相で使用できる多孔性吸着材料であることがよく知られている。