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摘要: 以蜜胺泡沫体为模板，采用氟化聚酰亚胺制备了微孔泡沫炭。测定了其对环境中水气的吸附／脱附行为，发现：泡沫炭在空气中400℃活化1h，可以提高其对水气的吸附能力。与活化前相比，对水气的吸附量几乎高达3倍，尽管其微孔容积仅增大了1.5倍。对环境水气中的可逆吸附率与微孔容积成线性关系，微孔容积为0.75mL/g的泡沫炭，其水气吸附率约为质量分数40%。Abstract: Microporous carbon foams were prepared from a fluorinated polyimide using melamine foam as a template. The adsorption/desorption behavior of water vapor in ambient air was examined. The activation of carbon foams at 400℃ for 1h in air was found to be effective in increasing the adsorptivity of water vapor. The amount of water vapor adsorbed after air activation was almost 3times as large as that before activation, although the micropore volume increase was only 1.5times. The reversible adsorptivity for water vapor in ambient air showed a linear dependence on micropore volume with an adsorptivity of about 40% mass fraction for a micropore volume of 0.75mL/g.
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Key words:
- Carbon foam /
- Polyimide /
- Template /
- Water vapor /
- Adsorption/desorption
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